TypeFilter 代理人

定義

Type オブジェクトの配列で表されるクラスをフィルター処理します。Filters the classes represented in an array of Type objects.

public delegate bool TypeFilter(Type ^ m, System::Object ^ filterCriteria);
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public delegate bool TypeFilter(Type m, object filterCriteria);
type TypeFilter = delegate of Type * obj -> bool
Public Delegate Function TypeFilter(m As Type, filterCriteria As Object) As Boolean 

パラメーター

m
Type

フィルターを適用する Type オブジェクト。The Type object to which the filter is applied.

filterCriteria
Object

一覧をフィルター処理するために使用する任意のオブジェクト。An arbitrary object used to filter the list.

戻り値

Boolean

フィルター選択されたリストに Type を含めるには true。それ以外の場合は falsetrue to include the Type in the filtered list; otherwise false.

継承
TypeFilter
属性

この例では、リフレクションを使用してTypeFilter一致するエントリのサブセットをフィルター処理または返すことができるデリゲートプロトタイプに一致するメソッドを定義する方法を示します。This example shows how to define a method matching the TypeFilter delegate prototype allowing you to use reflection to filter or return a subset of matching entries.

Imports System.Reflection

' This interface is defined in this assembly.
Public Interface IBookRetailer
    Sub Purchase()
    Sub ApplyDiscount()
End Interface

' This interface is also defined in this assembly.
Public Interface IMusicRetailer
    Sub Purchase()
End Interface

' This class implements three interfaces;
'    Two are defined in this assembly.
'    One is defined in another assembly.
Public Class MyRetailer
    Implements IBookRetailer, IMusicRetailer, IComparable

    ' For demonstration purposes, this method returns nothing.
    Public Function CompareTo(ByVal obj As Object) As Integer Implements System.IComparable.CompareTo
        Return Nothing
    End Function

    ' For demonstration purposes only, this method does nothing.
    Public Sub ApplyDiscount() Implements IBookRetailer.ApplyDiscount
    End Sub

    ' For demonstration purposes only, this method does nothing.
    Public Sub Purchase() Implements IBookRetailer.Purchase
    End Sub

    ' For demonstration purposes only, this method does nothing.
    Public Sub Purchase1() Implements IMusicRetailer.Purchase
    End Sub
End Class

Module Module1
    Sub Main()
        ' Find the interfaces defined by the MyRetailer class. Each interface found is passed to
        ' the TypeFilter method which checks if the interface is defined in the executing assembly.
        Dim retailerType As Type = GetType(MyRetailer)
        Dim interfaces() As Type = _
            retailerType.FindInterfaces(AddressOf TypeFilter, retailerType.Assembly.GetName().ToString())

        ' Show the interfaces that are defined in this assembly that are also implemented by MyRetailer.
        Console.WriteLine("MyRetailer implements the following interfaces (defined in this assembly):")
        For Each t In interfaces
            Console.WriteLine("   {0}", t.Name)
        Next
    End Sub

    ' This method is called by the FindInterfaces method. 
    ' This method is called once per defined interface.
    Function TypeFilter(ByVal t As Type, ByVal filterCriteria As Object) As Boolean
        ' Return true if interface is defined in the same 
        ' assembly identified by the filterCriteria object.
        Return t.Assembly.GetName().ToString() = CType(filterCriteria, String)
    End Function
End Module
' The example displays the following output:
'    MyRetailer implements the following interfaces (defined in this assembly):
'      IBookRetailer
'      IMusicRetailer

注釈

デリゲートTypeFilterは、クラスの一覧をフィルター処理するために使用されます。The TypeFilter delegate is used to filter a list of classes. 具体的には、オブジェクトのType配列で表されるクラスをフィルター処理するために使用します。Specifically, you use it to filter the classes represented in an array of Type objects. メソッドType.FindInterfacesは、このデリゲートを使用して、返されるインターフェイスの一覧をフィルター処理します。The Type.FindInterfaces method uses this delegate to filter the list of interfaces that it returns. DynamicInvokeおよびDelegateMulticastDelegateすべての派生クラスには、コンストラクターとメソッドがあります。Every derived class of Delegate and MulticastDelegate has a constructor and a DynamicInvoke method. Delegate説明にC++示されているビジュアルコードの例を参照してください。See the Visual C++ code example given in the description for Delegate.

拡張メソッド

GetMethodInfo(Delegate)

指定したデリゲートによって表されるメソッドを表すオブジェクトを取得します。Gets an object that represents the method represented by the specified delegate.

適用対象

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