Export (0) Print
Expand All
Expand Minimize
This topic has not yet been rated - Rate this topic

Type.HasElementTypeImpl Method

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.

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

protected abstract bool HasElementTypeImpl ()
protected abstract boolean HasElementTypeImpl ()
protected abstract function HasElementTypeImpl () : boolean
Not applicable.

Return Value

true if the Type is an array, a pointer, or is passed by reference; otherwise, false.

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.

using System;
using System.Reflection;
public class MyTypeDelegator : TypeDelegator
{
    public string myElementType = null;
    private Type myType = null ; 
    public MyTypeDelegator(Type myType) : base(myType)
    {
        this.myType = myType;
    }
    // Override Type.HasElementTypeImpl().
    protected override bool HasElementTypeImpl()
    {
        // Determine whether the type is an array.
        if(myType.IsArray)
        {
            myElementType = "array";
            return true;
        }
        // Determine whether the type is a reference.
        if(myType.IsByRef)
        {
            myElementType = "reference";
            return true;
        }
        // Determine whether the type is a pointer.
        if(myType.IsPointer)
        { 
            myElementType = "pointer";
            return true;
        }
        // Return false if the type is not a reference, array, or pointer type.
        return false;
    }  
}
public class Type_HasElementTypeImpl
{
    public static void Main()
    {
        try
        {
            int myInt = 0 ; 
            int[] myArray = new int[5];
            MyTypeDelegator myType = new MyTypeDelegator(myArray.GetType());
            // Determine whether myType is an array, pointer, reference type.  
            Console.WriteLine("\nDetermine whether a variable is an array, pointer, or reference type.\n");
            if( myType.HasElementType)
                Console.WriteLine("The type of myArray is {0}.", myType.myElementType);
            else
                Console.WriteLine("myArray is not an array, pointer, or reference type.");
            myType = new MyTypeDelegator(myInt.GetType());
            // Determine whether myType is an array, pointer, reference type. 
            if( myType.HasElementType)
                Console.WriteLine("The type of myInt is {0}.", myType.myElementType);
            else
                Console.WriteLine("myInt is not an array, pointer, or reference type.");
        }
        catch( Exception e )
        {
            Console.WriteLine("Exception: {0}", e.Message);
        }
    }
}

import System.*;
import System.Reflection.*;

public class MyTypeDelegator extends TypeDelegator
{
    public String myElementType = null;
    private Type myType = null;

    public MyTypeDelegator(Type myType)
    {
        super(myType);
        this.myType = myType;
    } //MyTypeDelegator

    // Override Type.HasElementTypeImpl().
    protected boolean HasElementTypeImpl()
    {
        // Determine whether the type is an array.
        if (myType.get_IsArray()) {
            myElementType = "array";
            return true;
        }
        // Determine whether the type is a reference.
        if (myType.get_IsByRef()) {
            myElementType = "reference";
            return true;
        }
        // Determine whether the type is a pointer.
        if (myType.get_IsPointer()) {
            myElementType = "pointer";
            return true;
        }
        // Return false if the type is not a reference, array, or pointer type.
        return false;
    } //HasElementTypeImpl
} //MyTypeDelegator

public class Type_HasElementTypeImpl
{
    public static void main(String[] args)
    {
        try {
            int myInt = 0;
            int myArray[] = new int[5];
            MyTypeDelegator myType = new MyTypeDelegator(myArray.GetType());
            // Determine whether myType is an array, pointer, reference type.  
            Console.WriteLine("\nDetermine whether a variable is an array, pointer," 
                + " or reference type.\n");
            if (myType.get_HasElementType()) {
                Console.WriteLine("The type of myArray is {0}.", myType.
                    myElementType);
            }
            else {
                Console.WriteLine("myArray is not an array, pointer,"
                    + "or reference type.");
            }
            myType = new MyTypeDelegator(((System.Int32)myInt).GetType()); 
            // Determine whether myType is an array, pointer, reference type. 
            if (myType.get_HasElementType()) {
                Console.WriteLine("The type of myInt is {0}.", myType.
                    myElementType);
            }
            else {
                Console.WriteLine("myInt is not an array, pointer," 
                    + " or reference type.");
            }
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception: {0}", e.get_Message());
        }
    } //main
} //Type_HasElementTypeImpl

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

Community Additions

ADD
Show:
© 2014 Microsoft. All rights reserved.