C# trouble passing inline code

Question

Hey I know there are a lot of questions already that contain the answer I need, but I'm having a hard time sifting between Func/Action/Delegate/Lambda, and as a javascript guy it all feels needlessly complex.

I'm working with 2d arrays and would like to write a method that accepts int width, int height, and any form of inline code to be called with every x/y pair. The point is just to avoid the bugs and time from writing a nested for loop over and over. But I'm unsure about the proper type of inline code to use, or what that looks like. I've tried a bunch of combos but can't make it work out.

What signature should I use on the method, and how do I call that?

Yes. I was using x and y to mean the iterating variable in the for loops. Where ultimately the point is to call " thePassedInlineCode(x,y) " — Weavermount
– Weavermount, Commented May 13, 2015 at 23:47
I have different representations of 2d data. This is the main reason I would like a method to simplely generate every integer coordinate and pass them to specific code — Weavermount
– Weavermount, Commented May 13, 2015 at 23:50
My real issue is picking the right kind of inline code, and using that in a method signature, and then calling it — Weavermount
– Weavermount, Commented May 13, 2015 at 23:54

Eduardo Wada · Accepted Answer · 2015-05-13 23:59:08Z

2

I usually use action as the type parameter, and a lambda when calling:

ForEachPair(5, 5, (x, y) =>
{
    Console.Write(x + "," + y);
});

public void ForEachPair(int width, int height, Action<int, int> callback)
{
    for (int i = 0; i < width; i++)
    {
        for (int j = 0; j < height; j++)
        {
            callback(i, j);
        }
    }
}

answered May 13, 2015 at 23:59

Eduardo Wada

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Rogue · Accepted Answer · 2015-05-14 00:10:18Z

1

While there are many ways to do this, one of the simplest and best ways is to define a delegate and accept that as an argument.

delegate void XYFunction(int x, int y); // define the return type and args

void ForEachXYPair(int width, int height, XYFunction func)
{
    // open your loop however
    {
        func(x, y);
    }
}

And then to call it...

ForEachXYPair(4, 4, (int x, int y) => { work; });
// OR
ForEachXYPair(4, 4, new XYFunction(AMethodForAbstractionsSake));

answered May 14, 2015 at 0:10

Rogue

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