Question

int index = 0;
while (true)
{
    index = fd.SelectedPath.IndexOf("D"); // never get to the if index -1 to check why !
    if (index == -1)
    {
        break;
    }
    string sub = fd.SelectedPath.Substring(index, 2);
}

sub is D: if i select the path D in the browser.
This is good i want to get only the D:
But its never getting out the loop its keep looping without stop.

Why it doesn’t get into the -1 if?

Answer 1

On each iteration the indexOf() method will starts search from the begining of string so you need to set startIndex parameter or you can use System.IO.Path.GetPathRoot(path) method.

int index = -1;
while (true)
{
 index = fd.SelectedPath.IndexOf("D",index+1); 
 ....
}