Value Property
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Nullable<T>.Value Property

 

Gets the value of the current Nullable<T> object if it has been assigned a valid underlying 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.

Exception Condition
InvalidOperationException

The HasValue property is false.

If a value of type T has not been assigned to the Nullable<T> object, you can compare it to null and retrieve its HasValue property, but you cannot access its Value property or call its other members.

The following example uses the HasValue property of a Nullable<Integer> object to determine whether it should display the object's Value property or its GetValueOrDefault property.

using System;

public class Example
{
   public static void Main()
   {
      Nullable<int> n1 = new Nullable<int>(10);
      Nullable<int> n2 = null;
      Nullable<int> n3 = new Nullable<int>(20);
      n3 = null;
      Nullable<int>[] items = { n1, n2, n3 }; 

      foreach (var item in items) {
         Console.WriteLine("Has a value: {0}", item.HasValue);
         if (item.HasValue) {
            Console.WriteLine("Type: {0}", item.GetType().Name);
            Console.WriteLine("Value: {0}", item.Value);
         }
         else {
            Console.WriteLine("Null: {0}", item == null);
            Console.WriteLine("Default Value: {0}", item.GetValueOrDefault());
         }
         Console.WriteLine();
      }                  
   }
}
// The example displays the following output:
//       Has a value: True
//       Type: Int32
//       Value: 10
//       
//       Has a value: False
//       Null: True
//       Default Value: 0
//       
//       Has a value: False
//       Null: True
//       Default Value: 0

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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