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InputBox: A simple user input dialog

, 1 Dec 2011
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Consider the scenario where the input value must be valid.public static double? GetDouble(string caption, string defaultValue, bool mustBeValid = false){ ClearLastError(); using (InputForm inForm = new InputForm(caption, defaultValue)) { while (true) { ...

Consider the scenario where the input value must be valid.

public static double? GetDouble(string caption, string defaultValue, bool mustBeValid = false)
{
   ClearLastError();
   using (InputForm inForm = new InputForm(caption, defaultValue))
   {
       while (true)
       {
          if (inForm.ShowDialog() != DialogResult.Cancel)
          {
             if (inForm.StringValue != string.Empty)
             {
                try 
                { 
                    //If valid value, we will break the loop.
                    return double.Parse(inForm.StringValue); 
                }
                catch (Exception ex)
                {
                  LastError = ex;
                }
             }
          }
          if(mustBeValid)
          {
             MessageBox.Show("You must enter a valid value");
          } else
          {
             return null;
          }
      }
   }
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Kabwla.Phone
Software Developer (Senior)
Netherlands Netherlands
Doing that 'computer thing' ever since the C64.
 
Sometimes I feel that being a programmer is much like being a doctor: You just have to know everything and if you don't, something dies.
 
Either being an appliction or a patient.
Oddly enough, more people care about the death of their application, than the massacre op people...

Comments and Discussions

 
Generaltesing. PinmemberVICKY44341726-Dec-11 23:08 

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