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Using textbox value as parameter in LINQ dat source/gridview : A value of type 'String' cannot be converted to type 'Double'

Answer 1

A:

To convert a string to a double you can use;

   string value;

   value = Double.MinValue.ToString();
   try {
      Console.WriteLine(Double.Parse(value));
   }   
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the Double type.", value);
   }

   value = Double.MaxValue.ToString();
   try {
      Console.WriteLine(Double.Parse(value));
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the Double type.", value);
   }


// The example displays the following output:
//    -1.79769313486232E+308 is outside the range of the Double type.
//    1.79769313486232E+308 is outside the range of the Double type.

If you want to check that a string is a valid double you can use try parse;

string value;
double number;

value = Double.MinValue.ToString();
if (Double.TryParse(value, out number))
   Console.WriteLine(number);
else
   Console.WriteLine("{0} is outside the range of a Double.", value);

value = Double.MaxValue.ToString();
if (Double.TryParse(value, out number))
   Console.WriteLine(number);
else
   Console.WriteLine("{0} is outside the range of a Double.", value);


// The example displays the following output:
//    -1.79769313486232E+308 is outside the range of the Double type.
//    1.79769313486232E+308 is outside the range of the Double type.

More details are accesible from all the major search engines, search them all at once here: http://www.liquidjelly.co.uk/supersearch/?q=double.tryparse()&lang=en-GB

HTH,
Mark

Mark Cooper 2010-01-04 19:28:12

Thanks Mark, greatly appreciated.

MrDean 2010-01-05 10:08:38

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Using textbox value as parameter in LINQ dat source/gridview : A value of type 'String' cannot be converted to type 'Double'

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