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Modifying a collection during enumeration is not allowed in C# because it can cause unpredictable behavior. To resolve this error, you can follow one of these approaches: Create a separate list of items to add or remove from the collection, and then perform the modifications after the enumeration is complete. Iterate over the collection using a ...
7 de may. de 2010 · The two are not completely separate. Where does not make a separate copy of the collection. It internally keeps a reference to the original collection and fetches elements from it as you request them. You can solve your problem by adding ToList() to force Where to iterate through the collection immediately.
I like to iterate backward using a for loop, but this can get tedious compared to foreach.One solution I like is to create an enumerator that traverses the list backward. You can implement this as an extension method on ArrayList or List<T>.The implementation for ArrayList is below.. public static IEnumerable GetRemoveSafeEnumerator(this ArrayList list) { for (int i = list.Count - 1; i >= 0; i ...
16 de sept. de 2013 · Enumerating a collection and modifying the same is not supported in Dictionary If you want to do that you can use ConcurrentDictionary which will be a overkill for this, since you're using single thread. Try this. foreach (var kvp in tempSortOrders.ToArray()) ...
12 de abr. de 2015 · @Dmitry Yes it's a copy. But the copy procedure itself is not thread-safe.The problem is now when you run ToArray. ToArray doesn't solve the problem, only migrates it to another problem: Destination array was not long enough.Check destIndex and length but just more unlikely to happen because ToArray() is way more faster without any processing inside.
Judging by the stack trace, it's not failing inside your foreach (or enumerating tempEntities which is a plain list) but inside one of ToList calls, when Select iterator's underlying list checks its state before moving on to next item.. This line in your stack trace makes me believe so: at System.Linq.Enumerable <CreateSelectIterator>c__Iterator1D`2[Compass.Mobile.Core.DataAccess.IEntity ...
14 de jun. de 2017 · In the output window of VS " Collection was modified; enumeration operation may not execute." ... It is not clear what in the project file VS is having problems with. I have not been able to find better or more detailed logs. It only happens when I open the solution and only for certain projects.
