Is there an IDictionary implementation that, on missing key, returns the default value instead of throwing?

Question

The indexer into Dictionary throws an exception if the key is missing. Is there an implementation of IDictionary that instead will return de

Answer 1

This question helped to confirm that the TryGetValue plays the FirstOrDefault role here.

One interesting C# 7 feature I would like to mention is the out variables feature, and if you add the null-conditional operator from C# 6 to the equation your code could be much more simple with no need of extra extension methods.

var dic = new Dictionary();
dic.TryGetValue("Test", out var item);
item?.DoSomething();

The downside of this is that you can't do everything inline like this;

dic.TryGetValue("Test", out var item)?.DoSomething();

If we'd need/want to do this we should code one extension method like Jon's.