[Pnet-developers] [bug #15345] strings created in a while loop are not made null each iteration

[Andrew Yates]

URL:
  <http://savannah.gnu.org/bugs/?func=detailitem&item_id=15345>

                 Summary: strings created in a while loop are not made null
each iteration
                 Project: DotGNU Portable.NET
            Submitted by: andrewy
            Submitted on: Sat 12/31/05 at 23:27
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open

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Details:

Strings (and probably every other type) created in a while loop are not made
null each iteration. Instead, their value is preserved across iterations.
I don't claim to be a C# expert, but it is my understanding that they should
be made null each iteration.

Consider the following code:

public class adsf {
  static void Main() {
    int a=0;
    while (a<=3) {
      string test;
      test += a.ToString();
      Console.WriteLine("{0}", test);
      a++;
    }
  }
}

This compiles fine with cscc, and gives this output:
0
01
012
0123

As you can see, the value of the string "test" is preserved across
iterations. csc or mcs both refuse to compile this code unless the line is
changed to: string test = ""

Regardless of whether or not cscc lets it compile, I believe that  the string
should be set to null every iteration.






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