Type.IsArrayImpl メソッド
派生クラスによってオーバーライドされるときに、 IsArray プロパティを実装し、 Type が配列かどうかを判断します。
Protected MustOverride Function IsArrayImpl() As Boolean
[C#]
protected abstract bool IsArrayImpl();
[C++]
protected: virtual bool IsArrayImpl() = 0;
[JScript]
protected abstract function IsArrayImpl() : Boolean;
戻り値
Type が配列である場合は true 。それ以外の場合は false 。
解説
Array クラスのインスタンスは、配列ではなくオブジェクトであるため、 false を返す必要があります。
使用例
[Visual Basic, C#, C++] MyTypeDelegator クラスの IsArrayImpl メソッドをオーバーライドし、変数が配列かどうかをチェックして、結果を表示する例を次に示します。
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] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン をクリックします。
必要条件
プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET, Common Language Infrastructure (CLI) Standard
参照
Type クラス | Type メンバ | System 名前空間 | IsArray