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6 de mar. de 2015 · You are allowed to change the value in an item in a collection. The error you're getting means that an item was either added or removed i.e.: the collection itself was modified, not an item inside the collection. This is most likely caused by another thread adding or removing items to this collection.
7 de feb. de 2014 · The error tells you EXACTLY what the problem is (and running in the debugger or reading the stack trace will tell you exactly where the problem is): C# Collection was modified; enumeration operation may not execute. Your problem is the loop. foreach (KeyValuePair<int, int> kvp in rankings) { // } wherein you modify the collection ...
3 de mar. de 2009 · This code is wrong and will skip some items in the collection if any element will be removed. For example: you have var arr = ["a", "b", "c"] and in first iteration (i = 0) you remove element at position 0 (element "a"). After this all the array elements will move one position up and array will be ["b", "c"].
18 de ene. de 2021 · 0. Estoy recibiendo este error al iterar un diccionario ¿Alguien sabe por qué és? Este es el mensaje de error completo: InvalidOperationException: Collection was modified; enumeration operation may not execute. System.Collections.Generic.Dictionary`2+KeyCollection+Enumerator [TKey,TValue].MoveNext () (at <9577ac7a62ef43179789031239ba8798>:0)
11 de jun. de 2021 · Collection was modified; enumeration operation may not execute | makolyte. 05/19/2024 by Maclain Wiltzer. If you try to add/remove items from a collection while it’s being looped over in a foreach loop (enumerated), then you’ll get the following exception:
14 de jun. de 2017 · In the output window of VS " Collection was modified; enumeration operation may not execute." And in the solution window it shows the project is unloaded. If I reload just that project using right click context menu in the solution window the project just reloads without error.
The "Collection was modified; enumeration operation may not execute" error occurs when you try to modify a collection while iterating over it using a foreach loop or an enumerator. Modifying a collection during enumeration is not allowed in C# because it can cause unpredictable behavior.
