tags:

views:

131

answers:

1

I am converting some Java code to C# and have found a few labelled "break" statements (e.g.)

label1:
    while (somethingA) {
       ...
        while (somethingB) {
            if (condition) {
                break label1;
            }
        }
     }

Is there an equivalent in C# (current reading suggests not) and if not is there any conversion other than (say) having bool flags to indicate whether to break at each loop end (e.g.)

bool label1 = false;
while (somethingA)
{
   ...
    while (somethingB)
    {
        if (condition)
        {
            label1 = true;
            break;
        }
    }
    if (label1)
    {
        break;
    }
}
// breaks to here

I'd be interested as to why C# doesn't have this as it doesn't seem to be very evil.

+7  A: 

You can just use goto to jump directly to a label.

while (somethingA)
{
    // ...
    while (somethingB)
    {
        if (condition)
        {
            goto label1;
        }
    }
}
label1:
   // ...

In C-like languages, goto often ends up cleaner for breaking nested loops, as opposed to keeping track of boolean variables and repeatedly checking them at the end of each loop.

Mark Rushakoff
@Mark thanks, I didn't realise C# allowed goto's.
peter.murray.rust
You're welcome. I didn't realize Java had labeled statements, so that makes us even :P
Mark Rushakoff