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Type.IsArrayImpl Method

When overridden in a derived class, implements the IsArray property and determines whether the Type is an array.

[Visual Basic]
Protected MustOverride Function IsArrayImpl() As Boolean
[C#]
protected abstract bool IsArrayImpl();
[C++]
protected: virtual bool IsArrayImpl() = 0;
[JScript]
protected abstract function IsArrayImpl() : Boolean;

Return Value

true if the Type is an array; otherwise, false.

Remarks

An instance of the Array class must return false because it is an object, not an array.

Example

[Visual Basic, C#, C++] The following example overrides the IsArrayImpl method in the MyTypeDelegator class, checks if a variable is an array, and displays the result.

[Visual Basic] 
Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic
Public Class MyTypeDelegator
    Inherits TypeDelegator
    Public myElementType As String = Nothing
    Public myType As Type
    Public Sub New(ByVal myType As Type)
        MyBase.New(myType)
        Me.myType = myType
    End Sub 'New
    ' Override IsArrayImpl().
    Protected Overrides Function IsArrayImpl() As Boolean
        ' Determine whether the type is an array.
        If myType.IsArray Then
            myElementType = "array"
            Return True
        End If
        ' Return false if the type is not an array.
        Return False
    End Function 'IsArrayImpl
End Class 'MyTypeDelegator

Public Class Type_IsArrayImpl
    Public Shared Sub Main()
        Try
            Dim myInt As Integer = 0
            ' Create an instance of an array element.
            Dim myArray(4) As Integer
            Dim myType As New MyTypeDelegator(myArray.GetType())
            Console.WriteLine(ControlChars.NewLine + "Determine whether the variable is an array." + ControlChars.NewLine)
            ' Determine whether 'myType' is an array type.  
            If myType.IsArray Then
                Console.WriteLine("The type of myArray is {0}.", myType.myElementType)
            Else
                Console.WriteLine("myArray is not an array.")
            End If
            myType = New MyTypeDelegator(myInt.GetType())
            ' Determine whether myType is an array type. 
            If myType.IsArray Then
                Console.WriteLine("The type of myInt is {0}.", myType.myElementType)
            Else
                Console.WriteLine("myInt is not an array.")
            End If
        Catch e As Exception
            Console.WriteLine("Exception: {0}", e.Message.ToString())
        End Try
    End Sub 'Main
End Class 'Type_IsArrayImpl

[C#] 
using System;
using System.Reflection;
public class MyTypeDelegator : TypeDelegator
{
    public string myElementType = null;
    public Type myType;
    public MyTypeDelegator(Type myType) : base(myType)
    {
        this.myType = myType;
    }
    // Override IsArrayImpl().
    protected override bool IsArrayImpl()
    {
        // Determine whether the type is an array.
        if(myType.IsArray)
        {
            myElementType = "array";
            return true;
        }
        // Return false if the type is not an array.
        return false;  
    }
}
public class Type_IsArrayImpl
{
    public static void Main()
    {
        try
        {
            int myInt = 0 ; 
            // Create an instance of an array element.
            int[] myArray = new int[5];
            MyTypeDelegator myType = new MyTypeDelegator(myArray.GetType());
            Console.WriteLine("\nDetermine whether the variable is an array.\n");
            // Determine whether myType is an array type.  
            if( myType.IsArray)
                Console.WriteLine("The type of myArray is {0}.", myType.myElementType);
            else
                Console.WriteLine("myArray is not an array.");
            myType = new MyTypeDelegator(myInt.GetType());

            // Determine whether myType is an array type. 
            if( myType.IsArray)
                Console.WriteLine("The type of myInt is {0}.", myType.myElementType);
            else
                Console.WriteLine("myInt is not an array.");
        }
        catch( Exception e )
        {
            Console.WriteLine("Exception: {0}", e.Message );
        }
    }
}

[C++] 
#using <mscorlib.dll>

using namespace System;
using namespace System::Reflection;
public __gc class MyTypeDelegator : public TypeDelegator {
public:
   String* myElementType;
public:
   Type*  myType;
public:
   MyTypeDelegator(Type* myType) : TypeDelegator(myType) {
      this->myType = myType;
   }
   // Override IsArrayImpl().
protected:
   bool IsArrayImpl() {
      // Determine whether the type is an array.
      if (myType->IsArray) {
         myElementType = S"array";
         return true;
      }
      // Return false if the type is not an array.
      return false;
   }
};

int main() {
   try {
      int myInt = 0 ;
      // Create an instance of an array element.
      Int32 myArray[] = new Int32[5];
      MyTypeDelegator* myType = new MyTypeDelegator(myArray->GetType());
      Console::WriteLine(S"\nDetermine whether the variable is an array.\n");
      // Determine whether myType is an array type.
      if (myType->IsArray)
         Console::WriteLine(S"The type of myArray is {0}.", myType->myElementType);
      else
         Console::WriteLine(S"myArray is not an array.");
      myType = new MyTypeDelegator(__box(myInt)->GetType());

      // Determine whether myType is an array type.
      if (myType->IsArray)
         Console::WriteLine(S"The type of myInt is {0}.", myType->myElementType);
      else
         Console::WriteLine(S"myInt is not an array.");
   } catch (Exception* e) {
      Console::WriteLine(S"Exception: {0}", e->Message);
   }
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework, Common Language Infrastructure (CLI) Standard

See Also

Type Class | Type Members | System Namespace | IsArray

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