Linq replace column value. toArray() Select dtCorrected.
Linq replace column value Rows[0]; The following code should work for you: My object hierarchy is like this: class Detail { public List<Row> Rows { get; set; } } class Row { public List<Column> Columns { get; set; } } class Column { public strin How to insert a default value to the returned collection if the where condition returns no results? from i in data. Distinct(); Please note that you need to change YourResultType to the type of the instances in your results variable. I want to run a quiote simple LINQ query, using where on column A. The foreach enumerates the query directly. Customers. My problem is that I have NULL values that represent the New status. Select(CreateExpression(filterName)). String, billingnumber); First, the clone method is only copying the structure(i. Field. You should be asking yourself "what tool should I use here" instead of trying to force LINQ to be that tool. If I expand the results view to see what the query outputs it says the following: "Function evaluation disabled because a previous function evaluation timed out. When using Linq-to-SQL, adding a column to an existing table, and setting a default value on that new column, it seems that Linq to SQL ignores the default value. AsEnumerable() where (string) row["username"] == "jack" group row by new {usernameKey = row["username"]} into g select new { jackHighestPrice = g. The problem is, that column A can contain null values (at least in t In this case column name is "display" is the column name, which I don't want to mention. String replacement with linq. –. Help me in understanding the State Change After the Final CNOT Gate in The above code adds a condition for contains in a column dynamically. ecoID). ') on your searchString. Max(x => x["price"]) }; str_output = str_output. LINQ stands for Language Integrated Query. But there are some smaller things I would change about Is it possible to set property on each element from List using LINQ. Key == col select new { ColumnName = col, FieldValue = field. – You could simply store the result since you are selecting the same DataRows twice. AsEnumerable. Text = row. PartId]). Person SET is_default = 0 WHERE person_id = 5 Is there a way to do this in LINQ? I currently use the: var result = (from p in Context. without having to modify the existing class and then knowing whether you're at the first item in the list or the last. As shown above, I have two datatable and I have to replace table_name column value in LINQ is not a good fit here, because you're modifying the collection. EngineParts. ForEach method: // using Fredrik Mörk's approach Array. You need to write expression in Invoke Code activity. Double')>-1 And CONVERT([Difference],'System. I have a table where there are two columns. I would like to get the ROWS of the first datatable, that are not present on the second datatable based on a column id. Equals(oldProjectId)) . You can use the Replace method of the string to replace spaces with an empty string. How to remove the row 3 which contains duplicate MobNo column value in c# without using LINQ. @Rachel7 this is maybe a too quick shot as it replace any space in any column to NA and returns a datatable. Hence I need a solution where I can dynamically pass a column name to the query. What you are currently trying to do is not going to work. LINQ-to-SQL or LINQ-to-Entities doesn't know how to translate string. Regex. Need to separate the product column with the help of comma by keeping the other columns same. To solve this, use the . Now I want to use this resultset and update a column's value. Count. SerialNo == each. ; Use GroupBy, but please note in GroupBy you should Group by all of the columns because if you just group by Id it doesn't remove duplicate items always. New EF Core 7 native feature — ExecuteUpdate: Finally! After a long wait, EF Core 7. Replace("A", "a"). Modified 11 years, 7 months ago. Here is my query: string NAME; <--- Column name string fundPerson; fundPerson = context. Add(ic)). Value and then press the period symbol after Value, you'll see the Intellisense pop up. Rows and DataTable. Merge(Contact. Rows[rowIndex]["GrossPerPop"]; (assuming the data is a string if not, use If I do a debug and set break points at each query, the first 3 gets the correct values. It works fine for me but there are two columns named. C# LINQ - Split Rows into I am fairly new to linq and I need to join two tables with the following requirements: Should left join t1 and t2. your Phy_UserName needs to be a column in your database. Name != "height")) . | Product | Cost ----- 1 | colgate | 50 1 | closeup | 50 1 | pepsodent | 50 2 | rin | 100 2 | surf | 100 Convert row values into columns using LINQ in c#. You have three option here for removing duplicate item in your List: Use a a custom equality comparer and then use Distinct(new DistinctItemComparer()) as @Christian Hayter mentioned. I'm pretty sure that there are better ways to change The point is the following: "[]Single(). ToString+row. The shortest way I know of to replace your code is this: . value. parallelize it with PLINQ) easier in the future. We can achieve this by using Linq Lambda expression. ToList(); Without assigning the result back to myList the above query will modify the value in the original list. studio, question, activities_panel. I have a table with more than 200k rows and in the column with index 0, named “Depósito”, there are values ranging from A001 to lst[i]. Replace(“your old value”,” your new I tried using Linq to replace all blank values with [something] but my problem is that the blank values can be on a String column, an int one, or a date one. Linq left join with multiple columns and default values [duplicate] Ask Question Asked 12 years, 7 months ago. I am populating a gridview using LINQ. Item(intRowItemIndex) = “=”+row. String. Follow Linq replace null/empty value with another value. Item(1). Name, Value = 30}) . Is there an update method I can use? Replace string values with LINQ. Ask Question Asked 9 years, 8 months ago. Union(list. Replace . e. Users. Use a for each row activity to loop through the data table; Use the same command above within a Hi everyone, My requirement i have an excel with many columns. Ask Question Asked 11 years, 2 months ago. Here is my query: If I understood your goal you want to specify a particular column and return all its values as a string array. My table has separate columns for Address and Zip Code. Access it just like you're doing with username (by column name):. Try these approaches out: int columnIndex = 2; // desired column index // for loop approach string[] results = new string[dt. feedback. Hi all I have list of type string with some items. from p in dx. g. Series, except_values: list = None) -> dict: """ What is the best way to query where one of the columns contains a value? This is my code: public JsonResult FindCustomer(string value) { var result= new SelectList(db. Select( new t(){Name = c. drivers = drivers. For example, if you have a percentage field in your anonymous type, you may not be able to calculate that until you know the max value or total (depending on how you want I have a DataSet, with a column, lets call it A, of type Int. Update and replace datatable rows value throughout all columns. When i try this, it gives . This might help you. What I do currently is gather the user's request and create a list ofKeyValuePairwhere theKeyis the column name and theValue` is the desired value of the LINQ stands for Language Integrated Query. for learning purpose) Case 1: DataTable Reconstruction approach; parsing number to Double; multiply Hi, I have a DataTable in below format. Value = value. I forgot to mention one point here. Select already returns a collection, hence your doubling the required memory for nothing. 5. Modified 12 years, Linq replace column value with another value. Ask Question Asked 12 years, 1 month ago. soccer7 soccer7. Update a value with linq. IsCalNull() AndAlso tiCal_drop. toArray() Select dtCorrected. While the LINQ methods always return a new collection, they don't create a new set of objects: Both the input collection (customers, in my example) and the output but here is an interesting thing: If you have a statement like: myList. If it's a boolean column you have to use Field<bool>("X"). For example consider the following Hello everyone, In a data table column ,lets say column 3 contains the value true and false, Provide a LINQ query to update the values in column 3 from true to false. An alternative to use with an array of objects (which you stated is the case in your question) is to use the Array. Question: How to update many column using craig code?. Something Else. PropertyToSet = value; } To clarify, I want to iterate through each object in a collection and then update a and if we want to modify the list and replace the existing values of the list to modified values, then first create a new empty list, then loop through I want to do this using LINQ. I want to update one column value in one table with other column value in another table. SNo. I know IQueryables aren't used to change values mostly just for querying but I need to use it in the next line to add to the ViewModel My Linq query is some thing like this: IEnumerable<Results> subResult = from query in datatable. You need to use the generated Is[Field]Null method :. conformalRow In dbDataSet. var result = from row in tbl. Below is my DataTable. This allows you to know the position of the item in your list, enumeration, etc. How can I achieve this with Linq? One variation I was trying: i have a dataset and i want to replace every cell that is '01/01/1754 00:00:00' with NULL. @wudzik's answer shows how LINQ is intended to be used: as a tool to query a collection. Where(t => t. Rows[index][columnIndex]. For the other values the value itself will be used as sorting string so that they are actually sorted. So is it possible to update my NULL values to 0? Then my groupby will return counts for the new Status. Now; return d; }). I want the column headers to have spaces when needed. ProjectId. 6: 712: November 16, 2023 How to replace a specific cell from datatable using linq. Replace value in DataColumn. But the ToList is redundant since DataTable. Let say 2 or more columns. day == true You can't access "price" that way since there's no price member on DataRow. For example: Dt1- EmpId EmpDesignation EmpGroup EmpName Role 1 HR A 2 HR B 3 TL C 4 Dev A 5 TL K 6 HR A 7 Using LINQ to change values in collection. So the result in Select should be a string or otherwise the ToString() on each item will be called to get a string. ProjectId = newProjectId); Let's say you'd like to make a change to some items in a collection and you'd like to do it with LINQ. Use a assign activity like this if we know which column values we want to replace If rows are to be distinct based on ALL COLUMNS. Where(u => )), without having to first retrieve the relevant entities from the database: The new built-in method called ExecuteUpdate — see @JoshLoops Sorry. In dtData I need to update the values for a couple of columns. Now i need to update the Initial dictionary by Filtering the Keys with ther SerialNumber and Replacing the values with the ecoID. Less if you make it hard to read. 45 in these columns then i got 12. Users where u. AsEnumerable(). I think the use of LINQ will be appropriate. Select(x => x. ForEach(query, x => x. Rows where r. 1. The second part is, and is a nice addition actually, but the translation Can I update 2 fields using linq foreach loop at once? Sample snippet : I have a userdata with Name, Email, CreateTime, LastUpdateTime fields. Modified 5 years, 11 months ago. the table data has been read using a ExecuteQuery and stored in a list of class object, in the below example I will have 4 rows returned. Input 22-34-35-26-46-Output-22-34-35-26-46. Linq query for updating list of objects with some data from another list of objects. Hot Network Questions How could a city build a circular canal? Hi All, I need to change the one value in particular column using LINQ query. You maybe able to use it to retrieve another copy of the data that is updated, but not for directly updating the original. i want to replace some items using linq, how can i do that? my below code is working fine but i want to do this in single line of code using the power of linq. Recently, I came across a client requirement where the client wanted to replace all '@' characters in emails with the text [attherate]. It's a bool property with a default value of true. The issue from above comes from the wrong datatype; generic value. Share. e 0 = "Active". For example, the user may request entries where Specialty == Basket Weaving and Rank == 12. changes. Count]; for (int index = 0; index < dt. if ‘relationship type’ column is ‘o&p’ and then i have to update that cell value with other column from same datatable ‘job relation career name’ for all the matched rows using linq query @Rahul_Unnikrishnan @Palaniyappan @Yoichi. Loop and update object value in a collection using LINQ. Data approach should work anyway. Cal _ AndAlso Not row. Table where p. There are several ways to do this (you can even get it down to the proverbial one line of code). ToList() . Commented Apr 16, 2015 at 13: You need to loop the rows in the data table. ItemArray. ) notation. ToTable(true, "ID", "Name", "DateBirth"); The columns you mention here, only those will be returned back in newDatatable. Length)); There are certainly ways to (ab)use LINQ to achieve the same results, but I'd consider them to be dirty hacks. Hot Network Questions Strange wavy lines when photographing canvas painting, not always visible? You can null/blank/space Etc value using LinQ Use Following Query . protected void Page_Load(object sender, EventArgs e) { myLinQtoSQLClassDataContext objDataContext = new myLinQtoSQLClassDataContext(); var allUserList = from CurrentUser in objDataContext. . Hot Network Questions Does launch on warning assume incoming ICBMs carry nuclear warheads? Loading a CSV into mariadb errs out as "invalid date format" A PicoBlaze assembly program that converts binary numbers to octal In sql server I create views where I can check for null values and replace them with a default if I want (i. 0. In this case, you will end up with an arbitrarily sized collection of false values. The user may request a 1, 2, or more columns and the columns that they request may be different. Item(20) Skip 5 Take 1 For Each Row As DataRow In query Row. RegularExpressions. My way of updating a column in c# is something like this It's the ToList() that allows that syntax, changing the query into a a LINQ-to-Objects enumeration. This We will discuss the method of updating the datatable column value from some value or from another datatable column value. this means i need to change the below query to say: If the blank cell is on a string col >> Replace with “NA” If the blank cell is on an int col >> Replace with 0 I need to update a value in a IEnumerable list. ColumnValue is Null replace the column null with empty string then compair with the How do i replace values in a column in the datatable? I’ve the following which i got from another side, but it keeps returning me an error, about strict on disallowing implicit conversion from string to boolean dt = dt. Commented Mar 2, Update multiple columns in linq using lambda expressions. quimi similar to the reference topic, you can try a replacement over all columns with: How to replace a column/row value in datatable in Uipath Linq replace column value with another value. AddInParameter(sqlcmd, "@BillingNumber", DbType. Dim query = From row As dbDataSet. Fetching the value using Linq. ToString @BronDavies I don't think the query engine would be able to use existing indexes on that column if you use something that is translated into LEN(SomeField) – Magnus. If table. Regex is usually needed for much more complicated pattern search than a simple string equality check. Where(d => d. DtBuild. Replace in LINQ to Entities. you can assign column values. Rows[rowIndex]. Going forward, you could set a default value. 3 KB). Here is a brief IEnumerable example: IEnumerable<string> allsubdirs = new List<string>() { "a", "b", "c" }; Now if I want to add a Linq is for querying, not updating. Columns. I have seen similar questions on SO but all the answers uses LINQ. assuming datatype for searchable column is also decimal. 3,975 3 3 Loop through each row in a column find a null value and replace in a datatable c#. Field(of string)(“yourcolumnname”). Where(t => (t. Parsing isn't a super cheap operation, casting is. 00 since that column is double. PERSON. It will raise an exception if the type is not a string. I’m having some difficulties creating a LINQ query to replace certain values in a column. My code so far: string SearchForThis = "test"; int index = from r in dgv. 2. updated = DateTime. ForEach(x => Array. Now your query seems to replace “X” with 1 but the problem is, it is updating values in first column not under “Standard” column and all the other column’s value are gone as well. so we know when we should take the new value and when we should stick with the old one. I rarely need to know if without caring which ones they are. Where(w => w. c# linq how to check for null values in the same column that i need to be not null. Here Replace Columnname with table column name and "" your search item in above code we looking null value. How to get a column value from data table with Linq. Linq to iterate through a collection and add another collection to its member. @salvatore. Select(Function(r) DtBuild. Max(x => x["price"]) }; LINQ to replace values in datatable column. ToString(); } // LINQ Then change the Where to Any. – Servy. I have a data table with one column having 0/1 values. Clone. Since the LINQ query will return an enumerable collection of boolean values, you will need to determine what the status flag should be assigned to based on this collection. Is_Deleted != false) LINQ is amazingly flexible. original_df[columns_to_overwrite] = other_data_frame[columns_to_overwrite] Share. Name == "height") . I'm doing a groupby using LINQ but in the database. ToList Select ic = I have a need to replace multiple strings with others in a query. 3. Viewed By default, in strongly typed datasets, properties throw that exception if the field is null. search decimal values in Linq query. You've got it right. This will apply the trick on background and no one will notice. Linq replace column value with another value. You need to use a DataRow to get a value; values exist in the data, not the column headers. Replace("-"+r("Column 1"). list = list. Linq replace null/empty value with another value. this goes well, except for the times any of the other fields is changed by another process/thread/user In that case I get an exception (optimistic concurrency), telling me to look out, values have been changed since I last got the object with That's because Time2 is a nullable type. required output dt_Table [Column1,Column2,column3 abc,1,false efg,2,false hijk,3,false grwgwer,4,false awfetg,5,false fwegre,6,false process created on C# In the answer I was using LINQ to SQL and in that case to commit to the database the usage is: db. Is this a data table? Then you can do the following. Table where w. Something like @Dev2 find some starter help here: Replace_AllCellsAllRows_EmptyNothingWith0. I want to replace the value with a string based of which number it is. Probably more philosophical for me. . Stack Overflow. Dim dtMytable As New Strongly_TypedTable dtMytable. Simply put: what you're doing is not querying. Now I only update 1 column. But if you are querying using IQueryable<T> and a LINQ provider that performs some transformation, then you can only use functions that the Replace specific values of all columns of datatable Studio datatable , studio , question , activities_panel , linq , invoke-code , linq-quey , excel-datatable My question is similar to the one here: Select a specific column based on another column's value but in LINQ, using VS2010, C#, . As a safety check you may want to also check that the value of a. Count; index++) { results[index] = dt. <--column name from string variable--> = TextBox1. The column is being selected dynamically via a string variable. The first part of your answer isn't true. ToLower() = SomeVar select p Which provides a nice single SQL statement with the relevant REPLACE() sql commands. Value. C# I have added a new property to my existing model. ForEach(f => f. This won’t necessarily make your applications any faster at the moment, but by taking advantage of the declarative syntax, it will allow you to change your underlying implementation (ie. Columns do not implement LINQ Select. I used dt. To join the EnginePartNames into for example:- replace 2 with 0 for the following input Input: string strInput = "21212121"; Output: "01010101" How to do it with LINQ. ForEach(Sub(row) row(“Issue”) = “Invalid”) Note: Create one argument for Invoke Code activity and mention properties as below. How to Is there any way to update value in one datatable from another datatable. Example. But you can give a try (From r In dtData. Expression = "col2"; This is the way I would do it : saying that "list" is a <List<t>> where t is a class with a Name and a Value field; but of course you can do it with any other class type. Create a sort string for each preferred value so that they are placed before the other values. So, this means your approach is the right one in general. Related. Modify your query to get filtered rows and then access the DataRow columns using columnname or Index. Modified 12 years, 1 month ago. :return: The same column with the replaced values """ name_changes = name_changes if name_changes else {} new_column = column. This will set the column 'col1' with the string value a: preview. Net 4. Remember, it is a side effect and it is not the proper way to update. weight (numeric(15, 4)) and. ToList(). Follow answered Aug 24, 2011 at 6:39 . @BenScotch I understand your need Ben, this is why in both version we check if x1 (the replaced string) is equal to x. foreach (KeyValuePair<string, string> each in newdictionary) { each. One of the best ways to start Thinqing in LINQ is to find places where you can replace iterative loops with LINQ queries. ToString,"\W$",""),r("Column 2"),r("Column Can you please tell me how to replace commas with periods in a column using a LINQ query? For example, there is a column “Column1” in it numbers of the format “12334,12”, as with the help of LINQ query… Sometimes we will have requirement to change or replace specific property values and return all properties for a C# List. I am using this to get the total of all these columns from database. If I remove the code where Im attempting to remove values of 0, the code runs but if for example I average the first column and the column has 10 rows but 3 of them contain 0, it will add all the rows together and divide by 10 where as I need it to divide by 7. Otherwise, that query would throw a runtime exception. You Linq replace null/empty value with another value. How to update a specific row of a DataTable. Keep in mind that string values should be quoted, otherwise it sees this as another columnname. How do you create your own custom column names in LINQ? For example: Dim query = From u In this is my collection of company list I want to assign values to Name property using LINQ listofCompany. Linq - check condition in where clause if field can be null. Name == "Tom"). g: col1+col2+col3+col4+col5 or col1+col3) and in those columns there are numerical values. names of column). 6 4700334342 You can't access "price" that way since there's no price member on DataRow. ToString. This field will either contain a 0, 1, or 2. anyway thanks for the vote and good luck :) I have following LINQ query to get a set of data. Cel I want to retrieve value corresponding to key for each group name and insert it store it sequentially in a model class. Text = You also mentioned that you want to replace null values in a Column. After that I have a requirement to show all the data of the Master Datatable with the corresponding 'description' column value from the Child table. Expression = "IIF(CONVERT([Difference],'System. Item(2). There are existing data in this table and I would like to set one specific row's new property to 1) I didn't downvote, but the restriction to reference types isn't a good idea IMO. For example: These are the two tables: Table1: ID Skip to main content Also LINQ is usually used to create new collections/views, not produce side-effects in existing ones. A B C D 1 1 1 1 2 2 2 3 3 4 4 4 4 I am using VB. Linq String Replace. Tables("conformal") _ Where Not row. 0 Hi, I want to compare two datatables based on Emp-Id from both datatable and if match found then want to update “EmpName” and “role” column from Dt1 with matched column “Name” and “Role” from Dt2 else update columns as “NA” in Dt1. DataTable newDatatable = dt. Join("_", I'm doing a groupby using LINQ but in the database. LINQ Replace Different String Values. 2) I'm not too fond of the name change either. ppr (Peter Preuss) June 18, 2020, 1:34pm 4. c# loop through linq results and update field. I have a DataTable which has 4 columns. Has anyone else experienced this behaviour? Is there a way to fix it, so that Linq-to-SQL or SQL Server automatically sets the default value? If you ever need to change the value Where it will return the sum value unless linq does not find anything in which case it will return 0. // `var physician` is the same as `Physician physician` // where you're declaring a Physician object from your DBML file // we're using `p` for `physician` in the lambda select function var physician = (from p in You can just cast it to a bool and be done. In column J = Date2 I want to change the cell from the date format "MM/dd/yyyy HH:mm:ss" to the format "dd-MM-yyyy". Follow answered Feb I need to change this into the following format using linq. Trim. Nullable types always have a value property. I need to loop on each row of dtData and if the row index > 1 then the value of a specific column should be reassigned as follows (So the new value should replace the old value in the same DataTable): row. Value of some rows are returning null. NET/System. Here's how it can be done easily using LINQ. SubmitChanges(); But for Entity Framework to commit the changes it is: db. I need each entry of the list to have a space or comma. Another poor style of achieving the end result is: Hello I need to select a column in my query with the name stored in a string variable, something like: string day = "Monday"; result = from w in DataContext. Replace(',', '. Select(t => partName[t. Replace(" ","NA")). Hence your Select. ISNULL(PrimaryPhone, 'No Primary #') AS PrimaryPhone. It's returning a Physicians object and you can get each value as follows. Item(0) = "A" Next 'In this mode you get all rows Dim Hello, I’m having some difficulties creating a LINQ query to replace certain values in a column. Note: dataType is string. Where(c=>c. AsEnumerable() Select col20 = dRow. Select(d => { d. id = 0; d. Use foreach instead of for. Columns("Updated Column"). ToList(); You get the part name from a dictionary by key, represented by PartId. IsTranNull() AndAlso tiTrans_drop. Because this is not fixed as this quote (") could be in any column's row. Replace a specific sub-string at specific position using LINQ. Hello everybody! Can you please tell me how to replace commas with periods in a column using a LINQ query? For example, there is a column “Column1” in it numbers of the format “12334,12”, as with the help of LINQ We often run into this where we want to include a the index value and first and last indicators in a list without creating a new object. You are just specifying a row, number 0 in this line: DataRow dr = journalTable. In this column, I'll show you all the variations that I know of. ToString(); } The data in the columns being averaged is of type double. Where(c => c. value (numeric(15, 4)) Problem : if I enter 12 and 13. If t2 is empty then the query should not fail - should use default values. i. To replace all values which meet a specific criteria in a DataTable on all columns I have used the following: (From r In InitialDT. The code which I am trying to use is: foreach (BloodBank b in stockDetails) { b. e. I need to change all the 1's to 'Yes' and all the 0's to 'No', using Linq (C#). It confuses/unreadable, not standard, and against Linq philosophy. Although you requested LINQ, this (ab)use of LINQ relies on side-effects and clutters the code. collection where i. It works, since indexer of IDictionary<TKey,TValue> accepts parameter of TKey type and returns a value of type TValue. I am sure there is also a better LINQ oriented way but this old school ADO. IsNullOrEmpty(), checking for null or an empty string, which is different than simply a null substitution. For example lets say I have two datatables dt1 and dt2. I want to replace “A” with “8810”, “B” with “8811”, and “C” with “8817”. Name == "George" select u; foreach (User us in users){ us. There is also a screenshot of I need to set a value in a table for a subset of rows. Key). c#; linq; Share. I am learning LINQ Query, and I want to update one column value using LINQ Query, can someone please guide me, Below is what I have. I want to change the 3rd column's value as "0". That wouldn't be a good idea here either, because you do need the index. EnginePartNames = x. I gave up LINQ a while back and now use Lambda exclusively. Edit DataTable cell. 15. Where(f => f. An overview of the different option to update a datacolumn value find here: [HowTo] Overview on different options for grouping data and processing the groups - News / Tutorials - UiPath Community Forum. Replace(“your old value”,” your new value”) Now use GENERATE DATATABLE ACTIVITY and mention the str_output variable as input And get the output with a variable of type datatable named Finaldt. Modified 2 years, You have to change public IEnumerable<Product> to public IEnumerable<string I need to submit a list of complete addresses to BingMaps for directions. replace(to_replace=name_changes) return new_column @staticmethod def create_unique_values_for_column(column: pd. day == true I guess, it should be something like that. How to reutrn null for a specific @Rachel7 this is maybe a too quick shot as it replace any space in any column to NA and returns a datatable. EDIT: The field is not null-able. SaveChanges() Linq replace column value with another value. Linq query DataTable _dtMaster = dt(); I'm using linq to retrieve a row from a table in the database. replacing column values in a datatable and getting value in datatable datatype using linq. But then you need to use a different column for the string representation or change the database query to return a varchar instead of bool(f. If you revise your line to: Time2 = (a. My problem is that I cannot find that specific columns for which I have tried this. Improve this question. Where(c=> c. Replace("B", "b"). 4500. This is modification can be explained by reference parameter Now, to change each cell whose value is 0 to DBNull in a DataTable, you can simply call the method: dtChangeZeroToNull (dataTable); Note: Seems like the DataTable. 4. Thanks in advance @Ric: The Field extension method is strongly typed which also suppiort nullable types, that's why i have used it. In LINQ, there is an extension method that might help: string val = table. Contains does not works for column containing null values. ApplicationId is the primary key column which I have and now I want to get the xyz column value for this ApplicationId. The LINQ approch you've accepted does not need another collection (than the DataTable) at all. We will discuss the method of updating the datatable column value from some value or from another datatable column value. I want to get the currency Id and currency Name from the currency table where currency is local currency, and assign the currency id and name to a text boxes on the form: no it has not changed it is me i have modified manually, but instead do you to know how to use linq query to replace value? thanks in advanced. Where(a => a == NAME); The problem is that the column name can change, it is not always the "NAME" column. Id = 1); (I want to assing name property of company id 1) which retrieves more than 16 columns. List<string> dtcolumnNames = dataTable. What Dear Experts, Good Day. 0 and LINQ to Entities Here's the snippet I'm having an i Skip to main content. C# replace values in a Datatable. SomePropertyName = string. dtCorrected has to be of datatype Datatable How to get a column value from a data table object. DefaultView. Type == type select i. ToList(); and I would like to replace column "B" of df with column "E" of df1 'A' 'E' 'C' 1 4 0 4 4 0 1 4 5 4 0 3 I tried to use the then re-insert the columns, but using the values that you intended to overwrite. Linq update multiple columns. LINQ is good for querying, but that's not what you're doing. So something like a FOR LOOP look that will loop through each row in the dataset and check if the value is '01/01/1754 00:00:00' then replace that value with 'NULL' Thanks One of the best ways to start Thinqing in LINQ is to find places where you can replace iterative loops with LINQ queries. People. ensure the correct datatypes. I have a table with more than 200k rows and in the column with index 0, named “Depósito”, there are values ranging from A001 to A999, B001 to B999, and C001 to C999. So instead in the code above we generate a new list (haven't changed any existing values) and then overwrite our original list (this is outside LINQ so we no longer care about functional programming ideas). Where(Function(a) a. How to replace a particular string in c# using regex or linq. LoadDataRow({System. Columns["col1"]. Clear(x, 0, x. It was designed to bring native data querying to . When both cases are to do with LINQ (e. Example Address: 1 State Street New York NY Example Zip Code: 10001. Follow asked Nov 9, 2015 at 8:45. Query means retrieving data, so it's not so good for updating data. Rows. I need to update a column Sales Amount and Net Amount in the data table where the values are null with a 0. var fields = from row in datarows from field in row from col in columnnames where field. AsEnumerable Select ia = r. Same thing with value as an int column. Then I update it back into the database. ColumnOrder = (short)i; But I was trying to find a way to do it via LINQ or something else with better performance. Text; } Select statement in your query returns the value of a cell, what you want is the DataRow of the DataTable. ToString()); For Report purpose ,During LINQ execution,What is the way to replace null values (Based on Delivery Date) with message "Yet to be delivered" (DateTime is value type). CopyToDataTable() Use linq and set the data table as Enumerable and select the fields from the data table field that matches what you are looking for. id = ' Some Args. The output should be an Data Table type. 0 now has a natively supported way to run UPDATE (and also DELETE) statements while also allowing you to use arbitrary LINQ queries (. dt_InvoiceNames. I’d like to make changes without using a loop through the data table. Select All distinct values in a column using LINQ. ConvertAll(Function (e) e. for example: var users = from u in context. Commented Sep 3, LINQ-to-SQL didn't change in 12 years. 5: 820: August 21, 2023 Help required in replacing a value from a column based on a condition Now we can change the query to this: var query = results. I have the id column on which basis I am trying to get another column value. Reference Bank Invoice Bank Amount Sales Amount Difference Net Amount 4900067828 8203000073 -201780 4900067827 8203000072 -1069080 4700334343 2100003040 -2361. edit all rows in a column, data table c#. – Inside the loop, use the LINQ query to remove spaces from the specific column. We then use the Data Column Expression using Assign in the below Way : DT. The LINQ query will update the value in the same Hello I need to select a column in my query with the name stored in a string variable, something like: string day = "Monday"; result = from w in DataContext. I am trying to get all the value from one column "Category", that is all the unique value, I don't want the list to be returned with duplicates. But i want to show in the grid exact value which i entered earlier like 12 and 13. AsEnumerable() select new Results As I understand the code correctly it will update only 1 column right?. Update two columns in a DataTable using LINQ. Value Next But I want to use LINQ to achieve it. @jmservera: you were right. All good :) I need to do this in a few queries around the application So far as I understand the question, this all depends on what the purpose of your status flag is. MyDatabase. If I make a list of anonymous types, as happens when using LINQ, for example, then you may want to change the value of an attribute once you get the rest of the information. Hi All, I have struggled with a function to replace values in a DataTable and after 3 days of searching I have discovered two which I like to share with the community. The 4th one does not get anything and says it's a DataQuery<string>. Select(w => w. 0000 and 13. I write some info in the code comments 'In this mode you update the sixth row (only the column 20) Dim query As EnumerableRowCollection(Of Object) = From dRow As DataRow In Dt. Studio. Select(t => t. This string contains column names (e. Otherwise we could immediately do this. 45. Improve this answer. I need to convert it into 2 rows, the column values coming in as rows. LINQ follows functional programming ideas and thus doesn't want you to change (mutate) existing variables. If you select multiple properties (as understood by you as columns), those properties still need to be combined somehow to make a Looking up keys in a dictionary is a O(1) operation compared to finding values in a list which is a O(n) operation, so it scales much better. copy afterwards, so that it copies all the column values. It doesn't have to replace the original and it makes the code cleaner – Panagiotis Kanavos. Marks = 35). Value }; The problem is that my code that handle the fields after this query fails because field. The same can also be done by looping through the array and replacing it, but LINQ gives you a lot of flexibility in filtering the data. In SQL, I would do this: UPDATE dbo. Also, if you are not querying a database but an in memory list, you need to change the query to this: In column I = Date1, I want to change the cell from the date format "MM/dd/yyyy HH:mm:ss" to the format "dd-MM-yyyy HH:mm:ss". ToList(); is bad style. Value;" just updates the value of the property but does not replace the property object in the array with the supplied one. NET as language. How can i implement following logic. Default value for linq select item if query didn't return anything. SELECT " + colsToSelect + " AS totalVolume " + "FROM myTable However I need to add nvl(col1,0) to each of the columns as those columns may contain null. First_Name and Last_name. When I click button I need to change the "Value" collumn, where ID matches the text input. It will give me all columns but not that specific columns. NET. Replace the Engine, rebuild, or just put on new rings Text wrapping in embedded multi-row, multi-column table (part II) The OP's question is fairly specific about obtaining a string with some values separated by commas. CopyToDataTable() NEW VERSION, Is there a way to do the following using LINQ? foreach (var c in collection) { c. Double'))" I have two datatables with different datarow structure but one common column. Text. toList Select ic = ia. Or. Expression = "'a'"; This will display in 'col1' the value of the column 'col2': preview. Value = customList. xaml (7. Double')<1,0,CONVERT([Difference],'System. So if you wish status to I'd like to get the index of a DataGridViewRow, where the value of its first column matches. Time2). Here, Notice the use of Add Data Column to add another column for updating the newer values. Field<string>("GrossPerPop"); or without LINQ: string val = (string)table. 1. If this is actually coming from a database, update it at the database in a single set-based operation: update [table] set [column] = @sp4_4 - The ToList() after the condition, is basically the same as you showed, and claimed it works for your scenario, the only difference is that the condition will be evaluated on the server (database) - ToList() forces EntityFramework to evaluate the LINQ and parse everything before to SQL and send it to the server, so calling the ToList() will parse an sql It's not LINQ, and it's not really much different to your nested for loops, just slightly less verbose. For example, I would want a column header to be First Name instead of FirstName. MyProp = you can't change the value in the select statement – Manatherin. It prevents using this method on nullable value types, which is particularly annoying when you want to use this method in another generic method where T hasn't been restricted. Davide Piras how does one update 1 column to set the value to one for all rows, so my table has three columns customerno,name,doneflag, I want to set the Doneflag to 1 for all,currently i have 8 rows in my table and all have a value of 0 as Doneflag, I want to do one update to set the doneflag for all rows to 1 using entity framework, this is simple using Mysql as it would be: Xaisoft, Linq queries, be it lambda expression or query expression, shouldn't be used to mutate list. LoadContact(User, lstIds)) For Each r In dtMytable r. Time2 is not null, before using . otgw udlrut zcmi ztbc ejl zispf utbdv debmrpau rss twvfck