Modify Collection during enumeration

[dragonwell]

I found out that this won't work:

foreach(MyType myType in myTypeCollection){

    myTypeCollection.Remove(myType)
}

I need to iterate over an ArrayList and remove an object if it meets a criteria but I get "Collection was modified; enumeration operation may not execute."

What is the alternate code?

Thanks,

David

 

[dragonwell]

Got it.

MyTypeCollection newCollection = new MyTypeCollection();

//add any good ones from the old into the new
foreach(MyType myType in original_myTypeCollection)
{
    if(myType.Criteria)
    newCollection.Add(myType);
}

//clear out the old and add all the new to it
original_myTypeCollection.Clear();
original_myTypeCollection.AddRange(newCollection);

 

[chiph]

There's a blurb in the docs saying that enumerating through a collection is not thread-safe. Which means that anything that changes the contents of the collection while you're enumerating it then makes the enumerator invalid (you must start over from the beginning).

CHip H.