Question

I’m looking for a way of getting a concurrent collection in C# or at least a collection which supports a concurrent enumerator. Right now I’m getting an InvalidOperationException when the collection over which I’m iterating changes.

I could just deep copy the collection and work with a private copy but I’m wondering if there is perhaps a better way

Code snippet:

foreach (String s in (List<String>) callingForm.Invoke(callingForm.delegateGetKillStrings)) {     //do some jazz } 

–edit–

I took the answer but also found that I needed to ensure that the code which was writing to the collection needed to attempt to get a lock as well.

private void addKillString(String s) {     lock (killStrings)     {         killStrings.Add(s);     } } 

Answer 1

Other than doing a deep-copy your best bet might be to lock the collection:

   List<string> theList = (List<String> )callingForm.Invoke(callingForm.delegateGetKillStrings);     lock(theList.SyncRoot) {         foreach(string s in theList) {                // Do some Jazz         }     }