Nullable<T>.Value Property

Definition

Namespace:

System

Assemblies:

netstandard.dll, System.Runtime.dll

Source:

Nullable.cs

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

C#

public T Value { get; }

Property Value

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.

Exceptions

InvalidOperationException

The HasValue property is false.

Examples

The following example uses the HasValue property of a Nullable<int> (Nullable(Of Integer) in Visual Basic) object to determine whether it should display the object's Value property or its GetValueOrDefault property.

C#

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

Remarks

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.

Applies to