Type.HasElementTypeImpl Method ()
.NET Framework (current version)
When overridden in a derived class, implements the HasElementType property and determines whether the current Type encompasses or refers to another type; that is, whether the current Type is an array, a pointer, or is passed by reference.
Assembly: mscorlib (in mscorlib.dll)
For example, Type.GetType("Int32[]").HasElementTypeImpl returns true, but Type.GetType("Int32").HasElementTypeImpl returns false. HasElementTypeImpl also returns true for "Int32*" and "Int32&".
The following example defines the class MyTypeDelegator, which overrides the HasElementTypeImpl method. The main class checks for the HasElementType property and displays the element type.
Imports System Imports System.Reflection Imports Microsoft.VisualBasic Public Class MyTypeDelegator Inherits TypeDelegator Public myElementType As String = Nothing Private myType As Type = Nothing Public Sub New(ByVal myType As Type) MyBase.New(myType) Me.myType = myType End Sub 'NewNew ' Override Type.HasElementTypeImpl(). Protected Overrides Function HasElementTypeImpl() As Boolean ' Determine whether the type is an array. If myType.IsArray Then myElementType = "array" Return True End If ' Determine whether the type is a reference. If myType.IsByRef Then myElementType = "reference" Return True End If ' Determine whether the type is a pointer. If myType.IsPointer Then myElementType = "pointer" Return True End If ' The type is not a reference, array, or pointer type. Return False End Function 'HasElementTypeImpl End Class 'MyTypeDelegator Public Class Type_HasElementTypeImpl Public Shared Sub Main() Try Dim myInt As Integer = 0 Dim myArray(4) As Integer Dim myType As New MyTypeDelegator(myArray.GetType()) Console.WriteLine(ControlChars.NewLine + "Determine whether a variable refers to an array or pointer or reference type." + ControlChars.NewLine) ' Determine whether myType is an array, pointer, reference type. If myType.HasElementType Then Console.WriteLine("The type of myArray is {0}.", myType.myElementType.ToString()) Else Console.WriteLine("myArray is not an array, pointer, or reference type.") End If myType = New MyTypeDelegator(myInt.GetType()) ' Determine whether myType is an array, pointer, reference type. If myType.HasElementType Then Console.WriteLine("The type of myInt is {0}.", myType.myElementType.ToString()) Else Console.WriteLine("myInt is not an array, pointer, or reference type.") End If Catch e As Exception Console.WriteLine("Exception: {0}", e.Message.ToString()) End Try End Sub 'Main End Class 'Type_HasElementTypeImpl
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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