Concurrent Dictionary AddOrUpdate vs Index Add

Question

There are two ways I\'ve assigned values to a existing key in a concurrent dictionary in my current project.

A. concurrentDictionary1[key] = value;

Answer 1

They both call TryAddInternal, so behave exactly the same**.

Update:

There is another difference. Here's the code from the indexer:

set
{
    TValue tValue;
    if (key == null)
    {
        throw new ArgumentNullException("key");
    }
    this.TryAddInternal(key, value, true, true, out tValue);
}

vs. from the method

while (!this.TryAddInternal(key, tValue, false, true, out tValue1));

So it appears there is a chance that the indexer will fail silently, whereas the method will continue trying until it succeeds. Hmm, some more in-depth analysis would be required to fully understand the differences between the two :/

Decompilers are still your friend.

**I derped.