Using Null Coalescing Part 3

Example 3: Make use of "null coalescing" :

Finally, we can make use of null coalescing operator (??). Here is an example of it: -

string myValue = newValue ?? someDefaultValue

Oh! is that so simple!....yes it is. But if newValue contains white-spaces then what? It will return white-spaces. So lets put it altogether in the method to return null if string contains white-spaces.

(for those using less then .net 4.0)

public  string evaluateNullOrWhiteSpace(string valueToEvaluate)

{

     if (string.IsNullOrEmpty(valueToEvaluate))

     {

         return null;

     }

    else

    {

         return (myValue.Trim()==string.Empty) ? null : valueToEvaluate)

    }

}

(for those using less then .net 4.0)

public string convertNullToDefaultValue(string myValue)

{

    if (string.IsNullOrWhiteSpace(myValue))

   {

        return null;

   }
  {
        return myValue;
  }

}

Call the above method using the magic of null coalescing : -

string myValue = evaluateNullOrWhiteSpace(newValue) ?? someDefaultValue

This is now you can set the default value for completely empty string (including white-spaces only).