Nullable<T>.Value Property

May 11, 2014

Gets the value of the current Nullable<T> value.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public T Value { get; }

Property Value

Type: T
The value of the current Nullable<T> object if the HasValue property is true. An exception is thrown if the HasValue property is false.

ExceptionCondition
InvalidOperationException

The HasValue property is false.

The following code example returns the value of a Nullable<T> object if that object has a defined value; otherwise, a default value is returned.


// This code example demonstrates the Nullable<T>.HasValue 
// and Value properties.

using System;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      DateTime? myNow;

      //  Assign the current date and time to myNow then display its value.
      myNow = DateTime.Now;
      Display(outputBlock, myNow, "1) ");

      //  Assign null (Nothing in Visual Basic) to myNow then display its value.
      myNow = null;
      Display(outputBlock, myNow, "2) ");
   }

   // Display the date and time.
   public static void Display(System.Windows.Controls.TextBlock outputBlock, DateTime? displayDateTime, string title)
   {
      // If a value is defined for the displayDatetime argument, display its value; otherwise, 
      // display that no value is defined.
      outputBlock.Text += title;
      if (displayDateTime.HasValue == true)
         outputBlock.Text += String.Format("The date and time is {0:F}.", displayDateTime.Value) + "\n";
      else
         outputBlock.Text += "The date and time is not defined." + "\n";
   }
}

/*
This code example produces the following results:

1) The date and time is Tuesday, April 19, 2005 4:16:06 PM.
2) The date and time is not defined.

*/


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Show:
© 2014 Microsoft