Type.IsValueType Property (System)

.NET Framework Class Library

Type..::.IsValueType Property

Gets a value indicating whether the Type is a value type.

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

Public ReadOnly Property IsValueType As Boolean

public bool IsValueType { get; }

public:
virtual property bool IsValueType {
	bool get () sealed;
}

abstract IsValueType : bool
override IsValueType : bool

Property Value

Type: System..::.Boolean
true if the Type is a value type; otherwise, false.

Implements

_Type..::.IsValueType

Remarks

Value types are types that are represented as sequences of bits; value types are not classes or interfaces. Value types are referred to as "structs" in some programming languages. Enums are a special case of value types.

This property returns false for the ValueType class, because ValueType is not a value type itself. It is the base class for all value types, and therefore any value type can be assigned to it. This would not be possible if ValueType itself was a value type. Value types are boxed when they are assigned to a field of type ValueType.

This property returns true for enumerations, but not for the Enum type itself. For an example that demonstrates this behavior, see IsEnum.

This property is read-only.

Examples

The following example creates a variable of type MyEnum, checks for the IsValueType property, and displays the result.


Imports System
Imports Microsoft.VisualBasic
Namespace SystemType
    Public Class [MyClass]

        ' Declare an enum type.
        Enum MyEnum
            One
            Two
        End Enum 'MyEnum

        Public Overloads Shared Sub Main()
            Try
                Dim myBool As Boolean = False
                Dim myTestEnum As MyEnum = MyEnum.One
                ' Get the type of myTestEnum.
                Dim myType As Type = myTestEnum.GetType()
                ' Get the IsValueType property of the myTestEnum variable.
                myBool = myType.IsValueType
                Console.WriteLine(ControlChars.Cr + "Is {0} a value type? {1}.", myType.FullName, myBool.ToString())
            Catch e As Exception
                Console.WriteLine(ControlChars.Cr + "An exception occurred: {0}", e.Message.ToString())
            End Try
        End Sub 'Main
    End Class '[MyClass] 
End Namespace 'SystemType


using System;
namespace SystemType
{
    public class MyClass
    {
        // Declare an enum type.
        enum MyEnum
        {
            One,
            Two
        }
        public static void Main(string []args)
        {
            try
            {
                bool myBool = false;
                MyEnum myTestEnum = MyEnum.One;
                // Get the type of myTestEnum.
                Type myType = myTestEnum.GetType();
                // Get the IsValueType property of the myTestEnum 
                // variable.
                myBool = myType.IsValueType;
                Console.WriteLine("\nIs {0} a value type? {1}.", myType.FullName, myBool.ToString());
            }
            catch (Exception e)
            {
                Console.WriteLine("\nAn exception occurred: {0}", e.Message);
            }
        }
    }
}


using namespace System;

// Declare an enum type.
enum class MyEnum
{
   One, Two
};

int main()
{
   try
   {
      bool myBool = false;
      MyEnum myTestEnum = MyEnum::One;

      // Get the type of myTestEnum.
      Type^ myType = myTestEnum.GetType();

      // Get the IsValueType property of the myTestEnum
      // variable.
      myBool = myType->IsValueType;
      Console::WriteLine( "\nIs {0} a value type? {1}.", myType->FullName, myBool );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "\nAn exception occurred: {0}", e->Message );
   }

}

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference