C# This[r, c] saw this in some C# code, how is it possible?

[NotASmurf]

Hey all, I was looking at some example code where they said "this[r, c] = sourceMatrix[r, c];"
where sourcematrix is double[][] but its in a custom local class, the code runs and works. but I am confused as to what "this[r, c]" does, how can a custom class be an array of doubles at the same time?? Any help appreciated.

 

[NotASmurf]

Sorry nevermind, seems you can overload c# keywords now.

 public double this[int row, int col]
        {
            get
            {
                return this.matrix[row, col];
            }
            set
            {
                this.matrix[row, col] = value;
            }
        }