Type.IsArrayImpl 方法
当在派生类中重写时，实现 IsArray 属性并确定 Type 是否为数组。
**命名空间:**System
**程序集:**mscorlib（在 mscorlib.dll 中）
语法
声明
Protected MustOverride Function IsArrayImpl As Boolean
用法
Dim returnValue As Boolean
returnValue = Me.IsArrayImpl
protected abstract bool IsArrayImpl ()
protected:
virtual bool IsArrayImpl () abstract
protected abstract boolean IsArrayImpl ()
protected abstract function IsArrayImpl () : boolean
返回值
如果 Type 是数组，则为 true；否则为 false。
备注
Array 类的实例必须返回 false，因为它是对象而不是数组。
示例
下面的示例重写 MyTypeDelegator 类中的 IsArrayImpl 方法，检查变量是不是数组，并显示结果。
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
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 );
}
}
}
using namespace System;
using namespace System::Reflection;
public ref class MyTypeDelegator: public TypeDelegator
{
public:
String^ myElementType;
Type^ myType;
MyTypeDelegator( Type^ myType )
: TypeDelegator( myType )
{
this->myType = myType;
}
protected:
// Override IsArrayImpl().
virtual bool IsArrayImpl() override
{
// 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;
}
};
int main()
{
try
{
int myInt = 0;
// Create an instance of an array element.
array<Int32>^myArray = gcnew array<Int32>(5);
MyTypeDelegator^ myType = gcnew 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 = gcnew 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 );
}
}
import System.*;
import System.Reflection.*;
public class MyTypeDelegator extends TypeDelegator
{
public String myElementType = null;
public Type myType;
public MyTypeDelegator(Type myType)
{
super(myType);
this.myType = myType;
} //MyTypeDelegator
// Override IsArrayImpl().
protected boolean IsArrayImpl()
{
// Determine whether the type is an array.
if (myType.get_IsArray()) {
myElementType = "array";
return true;
}
// Return false if the type is not an array.
return false;
} //IsArrayImpl
} //MyTypeDelegator
public class Type_IsArrayImpl
{
public static void main(String[] args)
{
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.get_IsArray()) {
Console.WriteLine("The type of myArray is {0}.", myType.
myElementType);
}
else {
Console.WriteLine("myArray is not an array.");
}
myType = new MyTypeDelegator(((System.Int32)myInt).GetType());
// Determine whether myType is an array type.
if (myType.get_IsArray()) {
Console.WriteLine("The type of myInt is {0}.", myType.
myElementType);
}
else {
Console.WriteLine("myInt is not an array.");
}
}
catch (System.Exception e) {
Console.WriteLine("Exception: {0}", e.get_Message());
}
} //main
} //Type_IsArrayImpl
平台
Windows 98、Windows 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
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
.NET Compact Framework
受以下版本支持：2.0、1.0