Question

As a trivial example lets say I have the following grid and I am looking for a particular cells value. When found I no longer need to process the loops.

foreach(DataGridViewRow row in grid.Rows)
{
    foreach(DataGridViewCell cell in row.Cells)
    {
        if(cell.Value == myValue)
        {
            //Do Something useful
            //break out of both foreach loops.
        }
    }
}

How is this done in C#. In Java I could use a label to name the outermost loop, and then break that loop, but I can’t seem to find an equivelant in C#.

What is the tersest way of accomplishing this in c#? I know I can set a boolean flag, and check it in the outer loop to break out of that one as well, but it just seems too verbose.

Thanks,

Answer 1

The most pleasant way is to break the second loop out into a function, like this:

public void DoubleLoop()
{
    for(int i = 0; i < width; i++)
    {
        for(int j = 0; j < height; j++)
        {
            if(whatever[i][j]) break; // let's make this a "double" break
        }
    }
}

goes to

public bool CheckWhatever(int whateverIndex)
{
    for(int j = 0; j < height; j++)
    {
        if(whatever[whateverIndex][j]) return false;
    }

    return true;
}

public void DoubleLoop()
{
    for(int i = 0; i < width; i++)
    {
        if(!CheckWhatever(i)) break;
    }
}

Of course, feel free to simplify this with LINQ or whatever (you could put CheckWhatever into the loop condition, too.) This is just a verbose demonstration of the principle.