error when no error

[Keith Stephens]

I have this code, and I am getting false errors.

DateTime? dummyDate = null;
              try
              {
                  dummyDate = DateTime.Parse(anyString);
                  // dummyDate = DateTime.Parse(anyString, System.Globalization.CultureInfo.CurrentCulture("en-US").DateTimeFormat);
                  // dummyDate = Convert.ToDateTime(anyString);  //DateTime.Parse(anyString);
              }
              catch
              {
                  return false;
              }
              return true;

JustCode give an error of dummyDate not used.  It is used in my try block.

[Svetlozar]

Hi Keith Stephens,

Currently, we treat variables as unused until they are read. We will consider once again the options in that scenario (maybe we should treat them as used for read and write access as well).

We have fixed the issues with unused warnings for ref/out variables/parameters in our codebase. The fix will be included in our next internal build.

About the code snippet you posted, the variable is actually unused. You can cause the side effect without the assignment.

try
{
   DateTime.Parse(anyString);
}
catch
{
  return false;
}
return true;

The problem here would be that removing the variable will remove the assignment too. We will fix that by keeping the right expression if it is a method invocation.

Just a note, you can use DateTime.TryParse() method and get rid of this try {} catch {} stuff.

If you have any other problems or suggestions, please don't hesitate to write back.

Best wishes,

Svetlozar Angelov

the Telerik team