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?
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.
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");
Dictionary<int, string>[] matrix = new Dictionary<int, string>[2];
Doing this allocates the array 'matrix', but the the dictionaries supposed to be contained in that array are never instantiated. You have to create a Dictionary object in all cells in the array by using the new keyword.
matrix[0] = new Dictionary<int, string>();
matrix[0].Add(0, "first str");
You forgot to initialize the Dictionary. Just put the line below before adding the item:
matrix[0] = new Dictionary<int, string>();
You've initialized the array, but not the dictionary. You need to initialize matrix[0] (though that should cause a null reference exception).
NullReferenceException. Show more code.matrix[0]to a newDictionary<int, string>? Also,TargetInvocationExceptionis part of theSystem.Reflectionnamespace. Where are you using reflection?