Question

I have a while loop and inside this while loop I have a foreach loop.

Here I learned how to skip the currently interaction on a loop by using Continue; Return; Break. But I need to leave the while loop when i’m inside the foreach loop is that possible ?

I’m on a interaction inside of the foreach loop and I want to leave the foreach and go to the next interaction of the while. How May I do that ?
Like so:

while (!reader.EndOfStream)  //COMEÇO DO WHILE
{
  ///Some Codes

  foreach(string s in checkedlistbox1.items)
        {
          switch(s)
           {
             case "1":
                if( 1 > 0)
                 {
                    ///HERE I WANT TO GO TO THE NEXT INTERACTION OF THE WHILE
                    ///When I use CONTINUE; HERE, I GO TO THE NEXT INTERACTION OF THE FOREACH. BUT I NEED TO GO TO THE NEXT OF THE WHILE.
                 }
           }
        }
}

Here’s what I want do to:
I’m reading a file.txt line by line, and writing a new one with these values and some others things… Some of these values may be required (seted by user), if a required fieldis empty, so I do nothing, and go to the next while interaction…

Answer 1

You need to break from the switch and then from the foreach, whilst having a variable set.

You can then check that variable to see whether you should continue to the next while iteration.

Do it like this:

while (!reader.EndOfStream)
{
    // Some Codes

    bool skipToNext = false;

    foreach (string s in checkedlistbox1.items)
    {
        switch (s)
        {
            case "1":
                if (1 > 0)
                {
                    skipToNext = true;
                    break;
                }
        }

        if (skipToNext) break;
    }

    // in the case of there being more code, you can now use continue
    if (skipToNext) continue;

    // more code
}

Example of this flow working

var list = new List<string> { "0", "1", "2" };
int a = 0, b = 2;

while (a++ < b)
{
    // Some Codes

    bool skipToNext = false;

    foreach (string s in list)
    {
        Debug.WriteLine("{0} - {1}", a, s);

        switch (s)
        {
            case "1":
                if (1 > 0)
                {
                    Debug.WriteLine("Skipping switch...");
                    skipToNext = true;
                    break;
                }
        }

        if (skipToNext)
        {
            Debug.WriteLine("Skipping foreach...");
            break;
        }
    }

    // in the case of there being more code, you can now use continue
    if (skipToNext)
    {
        Debug.WriteLine("Skipping to next while...");
        continue;
    }

    // more code
}

Outputs:

1 - 0
1 - 1
Skipping switch...
Skipping foreach...
Skipping to next while...
2 - 0
2 - 1
Skipping switch...
Skipping foreach...
Skipping to next while...