Array of dictionaries in C#

Question

I would like to use something like this:

Dictionary<int, string>[] matrix = new Dictionary<int, string>[2]; 

But, when I do:

matrix[0].Add(0, "first str"); 

It throws " 'TargetInvocationException '...Exception has been thrown by the target of an invocation."

What is the problem? Am I using that array of dictionaries correctly?

Answer 1

Try this:

Dictionary<int, string>[] matrix = new Dictionary<int, string>[]  {     new Dictionary<int, string>(),     new Dictionary<int, string>() }; 

You need to instantiate the dictionaries inside the array before you can use them.

Answer 2

Did you set the array objects to instances of Dictionary?

Dictionary<int, string>[] matrix = new Dictionary<int, string>[2]; matrix[0] = new Dictionary<int, string>(); matrix[1] = new Dictionary<int, string>(); matrix[0].Add(0, "first str");