Cannot modify foreach iteration variable
WebSep 15, 2024 · This browser is no longer supported. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. WebMay 5, 2015 · You should iterate your list, and modify your values like: foreach (var student in myList) { if (student.Name == "Tom") { student.Marks = 35; } } Or foreach (var student in myList.Where (r => r.Name == "Tom")) { student.Marks = 35; } Whatever you think better conveys the intent use that. but here is an interesting thing:
Cannot modify foreach iteration variable
Did you know?
WebSep 25, 2024 · This @foreach (var paintUsed in elem.PaintsUsed) can never work as you're trying to bind to a collection of string using 'foreach iteration variable.' Instead define a class, let's call it PaintsUsedStrings, like the following public class PaintsUsedStrings { public string StringValue { get; set; } } WebAug 26, 2014 · The iteration variable in a foreach is not a "reference to the element in the list" - it is merely the value from .Current {get;} in an iterator implementation obtained via GetEnumerator () - most commonly via IEnumerator [] but not always - indeed for a List it is a List.Enumerator value.
WebApr 21, 2024 · Solution 1. You cannot modify the loop variable within the foreach loop body at all: C#. foreach ( string strLineDup in sList2.Split ( '\n' )) // vbNewLine)) { ... strLineDup = Strings.LTrim (strLineDup); VB allows this, but C# does not. The simplest solution is to create a temporary variable inside the loop and modify that instead. WebDec 28, 2024 · Initially, I decided to use a foreach statement. However that resulted in a Can’t modify members because it is a ‘foreach iteration variable’ exception. Which …
WebOct 2, 2007 · I am getting this error when I tried to modify one field inside foreach loop. public struct myStruct { public int a; public bool b; //... } private List WebYou cannot change the iteration variable of a foreach-loop, but you can change members of the iteration variable. Therefore change the ChangeName method to private void ChangeName (StudentDTO studentDTO) { studentDTO.name = SomeName; } Note that studentDTO is a reference type. Therefore there is no need to return the changed …
WebMay 28, 2024 · Not sure why this works in VB.Net - but foreach will work as long as you do not change the collection you are iterating over - so its quit likely that you either do not change the source collection - or if you change it - the change is (implicitely?) applied after the collection is iterated over ... F-ES Sitecore 1-Jun-18 4:31am small business budget template freeWebBe aware however, that you cannot change the variable obj itself as it is the iteration variable. You'll get a compile error if you try. That means that you can't null it and if you're iterating value types, you can't modify any members as that would be changing the value. The C# language specification states (8.8.4) small business budget templatesWebNov 14, 2014 · The reason for this is simply that you cannot modify the collection that you iterate through, as you iterate through it. From the above statement, I can see that … small business budget worksheetWebAug 23, 2010 · Because you can't use a foreach loop to modify an array you're looping through. The loop iterates through the array, so if you try to modify what it's iterating through then unexpected behavior may occur. Furthermore, as Darin and DMan have pointed out, you're iterating through an IEnumerable which is itself read-only. small business budget template nursingWebNov 1, 2024 · foreach(var s in listOfStructs) { s.Property = x; } s is assigned to a copy of the actual struct in the collection. s.set_Property is now modifying the copy which is thrown away at the end of the current iteration. This is because 2 value type variables cannot point to the same instance. small business budget workbookWebJan 17, 2014 · A compile-time error occurs if the embedded statement attempts to modify the iteration variable (by assignment or the ++ and -- operators) or pass the iteration variable as a ref or out parameter. Share Improve this answer Follow edited Jan 17, 2014 at 4:23 answered Jan 17, 2014 at 4:18 Ehsan 31.4k 6 55 64 Add a comment small business budget worksheet templateWebMar 13, 2024 · Read-only contexts include foreach iteration variables, using variables, and fixed variables. To resolve this error, avoid assignments to a statement variable in using blocks, foreach statements, and fixed statements. small business budget template printable