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6 de mar. de 2015 · 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.
System.InvalidOperationException: Collection was modified; enumeration operation may not execute. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) at System.Collections.Generic.List`1.Enumerator.MoveNextRare() at System.Collections.Generic.List`1.Enumerator.MoveNext() ...
28 de oct. de 2012 · An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying, or deleting elements, the enumerator is irrecoverably invalidated and its behavior is undefined.
20 de may. de 2016 · Resulta que cuando ejecuto el programa, ingresa al formulario donde está esta parte del mismo y me aparece un error "Excepción no controlada del tipo 'System.InvalidOperationException'" y en el detalle me dice que el componente ConnectionString no ha sido inicializado, acá dejo la parte del código en la que me muestra esta excepción.
7 de ene. de 2024 · InvalidOperationException se usa en los casos en los que el error al invocar un método no se debe a argumentos no válidos. Normalmente, se inicia cuando el estado de un objeto no puede admitir la llamada al método. Por ejemplo, una excepción InvalidOperationException la inician métodos como los siguientes:
11 de jun. de 2021 · 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: System.InvalidOperationException: Collection was modified; enumeration operation may not execute. at System.Collections.Generic.List`1.Enumerator.MoveNext() This error can happen ...
16 de nov. de 2023 · InvalidOperationException. This exception has occurred. It reports a "collection was modified" error in the program. We are trying to remove elements from a C# List. With some code changes, we can fix the problem. It is important to know that the foreach-loop has some restrictions.
