not all code paths return a value

Question

I got this compiler error, what is the problem?

public PictureBox getinfo(int i, int j) { return grid[i, j]; } public PictureBox kingmove(int i, int j)///<-----the problem is here { getinfo(i, j); if (i < 9) { grid[i, j] = grid[i - 1, j - 1]; } else { grid[i, j] = grid[i, j]; }

How about reading a good C# book? That way you don't need to ask so often on SO and delete the question afterwards... — CodesInChaos
– CodesInChaos, Commented Nov 27, 2010 at 14:31
This common error occurs when you miss a return for a function or you returning a wrong datatype compare to what function should return. — Andrew Collins
– Andrew Collins, Commented Nov 27, 2010 at 15:15

CodesInChaos · Accepted Answer · 2010-11-27 14:25:28Z

Your second method has no return statement but a return-type different from void.
Add a return statement at the end of the method and not in the beginning.

And you could have edited that into your previous question.

The way you mix UI and game-logic is ugly too. The game-logic should know nothing about WinForms, picture-boxes,...
Instead write a function which takes a gamestate and renders it into some control/bitmap/picturebox/...

Additionally his call to getinfo() probably isn't doing anything useful, but that's an entirely different issue.

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