MulticastDelegate MulticastDelegate MulticastDelegate MulticastDelegate Class

定義

マルチキャスト デリゲート、つまり呼び出しリストに複数の要素を組み込むことができるデリゲートを表します。Represents a multicast delegate; that is, a delegate that can have more than one element in its invocation list.

public ref class MulticastDelegate abstract : Delegate
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public abstract class MulticastDelegate : Delegate
type MulticastDelegate = class
    inherit Delegate
Public MustInherit Class MulticastDelegate
Inherits Delegate
継承
MulticastDelegateMulticastDelegateMulticastDelegateMulticastDelegate
属性

次の例では、文字列StringContainerのコレクションを含むクラスを定義しています。The following example defines a class, StringContainer, which includes a collection of strings. そのメンバーの1つはCheckAndDisplayDelegateデリゲートです。これは、特定の条件を満たすStringContainerオブジェクトに格納されている文字列を表示するために使用されます。One of its members is the CheckAndDisplayDelegate delegate, which is used to display strings stored in a StringContainer object that satisfy particular criteria. デリゲートは、1つの文字列をパラメーターとしvoidて受け取り、を返します (Visual Basic Subでは、プロシージャ)。The delegate takes a single string as a parameter and returns void (or, in Visual Basic, it's a Sub procedure). また、1つのパラメーター DisplayAllQualified CheckAndDisplayDelegate (デリゲート) を持つメソッドも含まれています。It also includes a method, DisplayAllQualified, that has a single parameter, a CheckAndDisplayDelegate delegate. これにより、メソッドを呼び出すことができます。また、デリゲートに含まれるメソッドに基づいてフィルター処理された文字列のセットを表示することもできます。This allows the method to be called and to display a set of strings that are filtered based on the methods that the delegate contains.

また、この例では、次StringExtensionsの2つのメソッドを持つユーティリティクラスを定義しています。The example also defines a utility class, StringExtensions, that has two methods:

  • ConStart。子音で始まる文字列を表示します。ConStart, which displays strings that begin with a consonant.

  • VowelStart。母音で始まる文字列を表示します。VowelStart, which displays strings that begin with a vowel.

どちらのメソッドにも1つの文字列パラメーターがvoid含まれ、が返されることに注意してください。Note that both methods include a single string parameter and return void. つまり、両方のメソッドをCheckAndDisplayDelegateデリゲートに割り当てることができます。In other words, both methods can be assigned to the CheckAndDisplayDelegate delegate.

Test.Mainメソッドは、アプリケーションのエントリポイントです。The Test.Main method is the application entry point. StringContainerオブジェクトをインスタンス化し、それに文字列を設定し、1つconStartvowelStartメソッドを呼び出す2つCheckAndDisplayDelegateのデリゲートとを作成します。It instantiates a StringContainer object, populates it with strings, and creates two CheckAndDisplayDelegate delegates, conStart and vowelStart, that invoke a single method. 次に、 Delegate.Combineメソッドを呼び出して、 multipleDelegatesデリゲートを作成します。このVowelStartデリゲートにはConStart 、最初におよびデリゲートが含まれます。It then calls the Delegate.Combine method to create the multipleDelegates delegate, which initially contains the ConStart and VowelStart delegates. multipleDelegatesデリゲートが呼び出されると、コレクション内のすべての文字列が元の順序で表示されることに注意してください。Note that when the multipleDelegates delegate is invoked, it displays all the strings in the collection in their original order. これは、各文字が各デリゲートに個別に渡され、各文字が2つのデリゲートのうちの1つのみのフィルター条件を満たしているためです。This is because each letter is passed separately to each delegate, and each letter meets the filtering criteria of only one of the two delegates. 最後に、 Delegate.RemoveDelegate.Combineの呼び出しのmultipleDelegates後にconStart 、2つのデリゲートが含まれています。Finally, after calls to Delegate.Remove and Delegate.Combine, multipleDelegates contains two conStart delegates. このメソッドを呼び出すと、 StringContainerオブジェクト内の各文字列が2回表示されます。When it is invoked, each string in the StringContainer object is displayed twice.

using namespace System;
using namespace System::Collections::Generic;

ref class StringContainer
{
private:
   // A generic list object that holds the strings.
   List<String^>^ container = gcnew List<String^>;

public:
   // Define a delegate to handle string display.
   delegate void CheckAndDisplayDelegate(String^ str);

   // A method that adds more strings to the collection.
   void AddString(String^ str)
   {
      container->Add(str);
   }

   // Iterate through the strings and invoke the method(s) that the delegate points to.
   void DisplayAllQualified(CheckAndDisplayDelegate^ displayDelegate)
   {
      for each (String^ str in container)
         displayDelegate(str);
//       System::Collections::IEnumerator^ myEnum = container->GetEnumerator();
//       while ( myEnum->MoveNext() )
//       {
//          String^ str = safe_cast<String^>(myEnum->Current);
//          displayDelegate(str);
//      }
   }
};

//end of class StringContainer
// This class contains a few sample methods
ref class StringFuncs
{
public:

   // This method prints a String* that it is passed if the String* starts with a vowel
   static void ConStart(String^ str)
   {
      if (  !(str[ 0 ] == 'a' || str[ 0 ] == 'e' || str[ 0 ] == 'i' || str[ 0 ] == 'o' || str[ 0 ] == 'u') )
            Console::WriteLine( str );
   }

   // This method prints a String* that it is passed if the String* starts with a consonant
   static void VowelStart( String^ str )
   {
      if ( (str[ 0 ] == 'a' || str[ 0 ] == 'e' || str[ 0 ] == 'i' || str[ 0 ] == 'o' || str[ 0 ] == 'u') )
            Console::WriteLine( str );
   }
};

// This function demonstrates using Delegates, including using the Remove and
// Combine methods to create and modify delegate combinations.
int main()
{
   // Declare the StringContainer class and add some strings
   StringContainer^ container = gcnew StringContainer;
   container->AddString( "This" );
   container->AddString( "is" );
   container->AddString( "a" );
   container->AddString( "multicast" );
   container->AddString( "delegate" );
   container->AddString( "example" );

// RETURN HERE.
   // Create two delegates individually using different methods
   StringContainer::CheckAndDisplayDelegate^ conStart = gcnew StringContainer::CheckAndDisplayDelegate( StringFuncs::ConStart );
   StringContainer::CheckAndDisplayDelegate^ vowelStart = gcnew StringContainer::CheckAndDisplayDelegate( StringFuncs::VowelStart );

   // Get the list of all delegates assigned to this MulticastDelegate instance. 
   array<Delegate^>^ delegateList = conStart->GetInvocationList();
   Console::WriteLine("conStart contains {0} delegate(s).", delegateList->Length);
   delegateList = vowelStart->GetInvocationList();
   Console::WriteLine("vowelStart contains {0} delegate(s).\n", delegateList->Length );

   // Determine whether the delegates are System::Multicast delegates
   if ( dynamic_cast<System::MulticastDelegate^>(conStart) && dynamic_cast<System::MulticastDelegate^>(vowelStart) )
   {
      Console::WriteLine("conStart and vowelStart are derived from MulticastDelegate.\n");
   }

   // Execute the two delegates.
   Console::WriteLine("Executing the conStart delegate:" );
   container->DisplayAllQualified(conStart);
   Console::WriteLine();
   Console::WriteLine("Executing the vowelStart delegate:" );
   container->DisplayAllQualified(vowelStart);

   // Create a new MulticastDelegate and call Combine to add two delegates.
   StringContainer::CheckAndDisplayDelegate^ multipleDelegates =
           dynamic_cast<StringContainer::CheckAndDisplayDelegate^>(Delegate::Combine(conStart, vowelStart));

   // How many delegates does multipleDelegates contain?
   delegateList = multipleDelegates->GetInvocationList();
   Console::WriteLine("\nmultipleDelegates contains {0} delegates.\n", 
                      delegateList->Length );

   //       // Pass this multicast delegate to DisplayAllQualified.
   Console::WriteLine("Executing the multipleDelegate delegate.");
   container->DisplayAllQualified(multipleDelegates);
   // Call remove and combine to change the contained delegates.
   multipleDelegates = dynamic_cast<StringContainer::CheckAndDisplayDelegate^>
                      (Delegate::Remove(multipleDelegates, vowelStart));
   multipleDelegates = dynamic_cast<StringContainer::CheckAndDisplayDelegate^>
                      (Delegate::Combine(multipleDelegates, conStart));

   // Pass multipleDelegates to DisplayAllQualified again.
   Console::WriteLine("\nExecuting the multipleDelegate delegate with two conStart delegates:");
   container->DisplayAllQualified(multipleDelegates);
} 
// The example displays the following output:
//    conStart contains 1 delegate(s).
//    vowelStart contains 1 delegate(s).
//    
//    conStart and vowelStart are derived from MulticastDelegate.
//    
//    Executing the conStart delegate:
//    This
//    multicast
//    delegate
//    
//    Executing the vowelStart delegate:
//    is
//    a
//    example
//    
//    
//    multipleDelegates contains 2 delegates.
//    
//    Executing the multipleDelegate delegate.
//    This
//    is
//    a
//    multicast
//    delegate
//    example
//    
//    Executing the multipleDelegate delegate with two conStart delegates:
//    This
//    This
//    multicast
//    multicast
//    delegate
//    delegate
using System;
using System.Collections.Generic;

class StringContainer
{
   // Define a delegate to handle string display. 
   public delegate void CheckAndDisplayDelegate(string str);

   // A generic list object that holds the strings. 
   private List<String> container = new List<String>();

   // A method that adds strings to the collection. 
   public void AddString(string str) 
   {
      container.Add(str);
   }

   // Iterate through the strings and invoke the method(s) that the delegate points to. 
   public void DisplayAllQualified(CheckAndDisplayDelegate displayDelegate) 
   {
      foreach (var str in container) {
         displayDelegate(str);
      }
   }
 }    

// This class defines some methods to display strings. 
class StringExtensions
{
   // Display a string if it starts with a consonant. 
   public static void ConStart(string str) 
   {
      if (!(str[0]=='a'||str[0]=='e'||str[0]=='i'||str[0]=='o'||str[0]=='u'))
          Console.WriteLine(str);
   }

   // Display a string if it starts with a vowel.
   public static void VowelStart(string str) 
   {
      if ((str[0]=='a'||str[0]=='e'||str[0]=='i'||str[0]=='o'||str[0]=='u'))
          Console.WriteLine(str);
   }
}

// Demonstrate the use of delegates, including the Remove and 
// Combine methods to create and modify delegate combinations. 
class Test
{
   static public void Main()
   {
      // Declare the StringContainer class and add some strings
      StringContainer container = new StringContainer();
      container.AddString("This");
      container.AddString("is");
      container.AddString("a");
      container.AddString("multicast");
      container.AddString("delegate");
      container.AddString("example");

      // Create two delegates individually using different methods.
      StringContainer.CheckAndDisplayDelegate conStart = StringExtensions.ConStart;
      StringContainer.CheckAndDisplayDelegate vowelStart = StringExtensions.VowelStart;

      // Get the list of all delegates assigned to this MulticastDelegate instance. 
      Delegate[] delegateList = conStart.GetInvocationList();
      Console.WriteLine("conStart contains {0} delegate(s).", delegateList.Length);
      delegateList = vowelStart.GetInvocationList();
      Console.WriteLine("vowelStart contains {0} delegate(s).\n", delegateList.Length);

      // Determine whether the delegates are System.Multicast delegates. 
      if (conStart is System.MulticastDelegate && vowelStart is System.MulticastDelegate) 
          Console.WriteLine("conStart and vowelStart are derived from MulticastDelegate.\n");

      // Execute the two delegates.
      Console.WriteLine("Executing the conStart delegate:");
      container.DisplayAllQualified(conStart);
      Console.WriteLine();
      Console.WriteLine("Executing the vowelStart delegate:");
      container.DisplayAllQualified(vowelStart);
      Console.WriteLine();
      
      // Create a new MulticastDelegate and call Combine to add two delegates.
      StringContainer.CheckAndDisplayDelegate multipleDelegates = 
            (StringContainer.CheckAndDisplayDelegate) Delegate.Combine(conStart, vowelStart);

      // How many delegates does multipleDelegates contain?
      delegateList = multipleDelegates.GetInvocationList();
      Console.WriteLine("\nmultipleDelegates contains {0} delegates.\n",
                        delegateList.Length);

      // Pass this multicast delegate to DisplayAllQualified.
      Console.WriteLine("Executing the multipleDelegate delegate.");
      container.DisplayAllQualified(multipleDelegates);

      // Call remove and combine to change the contained delegates.
      multipleDelegates = (StringContainer.CheckAndDisplayDelegate) Delegate.Remove(multipleDelegates, vowelStart);
      multipleDelegates = (StringContainer.CheckAndDisplayDelegate) Delegate.Combine(multipleDelegates, conStart);

      // Pass multipleDelegates to DisplayAllQualified again.
      Console.WriteLine("\nExecuting the multipleDelegate delegate with two conStart delegates:");
      container.DisplayAllQualified(multipleDelegates);
   }
}
// The example displays the following output:
//    conStart contains 1 delegate(s).
//    vowelStart contains 1 delegate(s).
//    
//    conStart and vowelStart are derived from MulticastDelegate.
//    
//    Executing the conStart delegate:
//    This
//    multicast
//    delegate
//    
//    Executing the vowelStart delegate:
//    is
//    a
//    example
//    
//    
//    multipleDelegates contains 2 delegates.
//    
//    Executing the multipleDelegate delegate.
//    This
//    is
//    a
//    multicast
//    delegate
//    example
//    
//    Executing the multipleDelegate delegate with two conStart delegates:
//    This
//    This
//    multicast
//    multicast
//    delegate
//    delegate
Imports System.Collections.Generic

Class StringContainer
    ' Define a delegate to handle string display. 
    Delegate Sub CheckAndPrintDelegate(ByVal str As String)

    ' A generic list object that holds the strings.
    Private container As New List(Of String)()

     ' A method that adds strings to the collection. 
     Public Sub AddString(ByVal s As String)
        container.Add(s)
    End Sub

    ' Iterate through the strings and invoke the method(s) that the delegate points to.
    Public Sub DisplayAllQualified(ByVal displayDelegate As CheckAndPrintDelegate)
        For Each s In container
            displayDelegate(s)
        Next
    End Sub
End Class

' This class defines some methods to display strings. 
Class StringExtensions
    ' Display a string if it starts with a consonant. 
    Public Shared Sub ConStart(ByVal str As String)
        If Not (str.Chars(0) = "a"c Or str.Chars(0) = "e"c Or str.Chars(0) = "i"c _ 
                Or str.Chars(0) = "o"c Or str.Chars(0) = "u"c) Then
            Console.WriteLine(str)
        End If
    End Sub 

    ' Display a string if it starts with a vowel.
    Public Shared Sub VowelStart(ByVal str As String)
        If (str.Chars(0) = "a"c Or str.Chars(0) = "e"c Or str.Chars(0) = "i"c _
            Or str.Chars(0) = "o"c Or str.Chars(0) = "u"c) Then
            Console.WriteLine(str)
        End If
    End Sub 
End Class 

' Demonstrate the use of delegates, including the Remove and 
' Combine methods to create and modify delegate combinations. 
Class Test
    Public Shared Sub Main()
        ' Declare the StringContainer class and add some strings
        Dim container As New StringContainer()
        container.AddString("this")
        container.AddString("is")
        container.AddString("a")
        container.AddString("multicast")
        container.AddString("delegate")
        container.AddString("example")

        ' Create two delegates individually using different methods.
        Dim constart As StringContainer.CheckAndPrintDelegate = AddressOf StringExtensions.ConStart
        Dim vowelStart As StringContainer.CheckAndPrintDelegate = AddressOf StringExtensions.VowelStart

        ' Get the list of all delegates assigned to this MulticastDelegate instance. 
        Dim delegateList() As [Delegate] = conStart.GetInvocationList()
        Console.WriteLine("conStart contains {0} delegate(s).", delegateList.Length)
        delegateList = vowelStart.GetInvocationList()
        Console.WriteLine("vowelStart contains {0} delegate(s).", delegateList.Length)
        Console.WriteLine()
        
        ' Determine whether the delegates are System.Multicast delegates
        If TypeOf conStart Is System.MulticastDelegate And TypeOf vowelStart Is System.MulticastDelegate Then
            Console.WriteLine("conStart and vowelStart are derived from MulticastDelegate.")
            Console.WriteLine()
        End If

        ' Run the two single delegates one after the other.
        Console.WriteLine("Executing the conStart delegate:")
        container.DisplayAllQualified(conStart)
        Console.WriteLine("Executing the vowelStart delegate:")
        container.DisplayAllQualified(vowelStart)
        Console.WriteLine()

        ' Create a new MulticastDelegate and call Combine to add two delegates.
        Dim multipleDelegates As StringContainer.CheckAndPrintDelegate = 
                  CType([Delegate].Combine(conStart, vowelStart), 
                  StringContainer.CheckAndPrintDelegate)

        ' How many delegates does multipleDelegates contain?
        delegateList = multipleDelegates.GetInvocationList()
        Console.WriteLine("{1}multipleDelegates contains {0} delegates.{1}",
                          delegateList.Length, vbCrLf)

        ' Pass this mulitcast delegate to DisplayAllQualified.
        Console.WriteLine("Executing the multipleDelegate delegate.")
        container.DisplayAllQualified(multipleDelegates)

        ' Call remove and combine to change the contained delegates.
        multipleDelegates = CType([Delegate].Remove(multipleDelegates, vowelStart), 
                            StringContainer.CheckAndPrintDelegate)
        multipleDelegates = CType([Delegate].Combine(multipleDelegates, conStart), 
                            StringContainer.CheckAndPrintDelegate)

        ' Pass multipleDelegates to DisplayAllQualified again.
        Console.WriteLine()
        Console.WriteLine("Executing the multipleDelegate delegate with two conStart delegates:")
        container.DisplayAllQualified(multipleDelegates)
    End Sub 
End Class 
' The example displays the following output:
'    conStart contains 1 delegate(s).
'    vowelStart contains 1 delegate(s).
'    
'    conStart and vowelStart are derived from MulticastDelegate.
'    
'    Executing the conStart delegate:
'    This
'    multicast
'    delegate
'    
'    Executing the vowelStart delegate:
'    is
'    a
'    example
'    
'    
'    multipleDelegates contains 2 delegates.
'    
'    Executing the multipleDelegate delegate.
'    This
'    is
'    a
'    multicast
'    delegate
'    example
'    
'    Executing the multipleDelegate delegate with two conStart delegates:
'    This
'    This
'    multicast
'    multicast
'    delegate
'    delegate

注釈

MulticastDelegateは特殊なクラスです。MulticastDelegate is a special class. コンパイラおよびその他のツールは、このクラスから派生できますが、明示的に派生することはできません。Compilers and other tools can derive from this class, but you cannot derive from it explicitly. Delegateクラスにも同じことが当てはまります。The same is true of the Delegate class.

共通言語ランタイムには、デリゲート型がからMulticastDelegate継承するメソッドに加えBeginInvokeて、ととEndInvokeいう2つの特殊なメソッドが用意されています。In addition to the methods that delegate types inherit from MulticastDelegate, the common language runtime provides two special methods: BeginInvoke and EndInvoke. これらのメソッドの詳細については、「同期メソッドの非同期呼び出し」を参照してください。For more information about these methods, see Calling Synchronous Methods Asynchronously.

MulticastDelegateは、1つ以上の要素で構成される呼び出しリストと呼ばれるデリゲートのリンクリストがあります。A MulticastDelegate has a linked list of delegates, called an invocation list, consisting of one or more elements. マルチキャストデリゲートが呼び出されると、呼び出しリスト内のデリゲートが、出現する順序で同期的に呼び出されます。When a multicast delegate is invoked, the delegates in the invocation list are called synchronously in the order in which they appear. リストの実行中にエラーが発生した場合は、例外がスローされます。If an error occurs during execution of the list then an exception is thrown.

コンストラクター

MulticastDelegate(Object, String) MulticastDelegate(Object, String) MulticastDelegate(Object, String) MulticastDelegate(Object, String)

MulticastDelegate クラスの新しいインスタンスを初期化します。Initializes a new instance of the MulticastDelegate class.

MulticastDelegate(Type, String) MulticastDelegate(Type, String) MulticastDelegate(Type, String) MulticastDelegate(Type, String)

MulticastDelegate クラスの新しいインスタンスを初期化します。Initializes a new instance of the MulticastDelegate class.

メソッド

Clone() Clone() Clone() Clone()

デリゲートの簡易コピーを作成します。Creates a shallow copy of the delegate.

(Inherited from Delegate)
CombineImpl(Delegate) CombineImpl(Delegate) CombineImpl(Delegate) CombineImpl(Delegate)

新しいデリゲートを生成するために、指定した Delegate とこの Delegate を組み合わせます。Combines this Delegate with the specified Delegate to form a new delegate.

DynamicInvoke(Object[]) DynamicInvoke(Object[]) DynamicInvoke(Object[]) DynamicInvoke(Object[])

現在のデリゲートが表すメソッドを動的に呼び出します (遅延バインディング)。Dynamically invokes (late-bound) the method represented by the current delegate.

(Inherited from Delegate)
DynamicInvokeImpl(Object[]) DynamicInvokeImpl(Object[]) DynamicInvokeImpl(Object[]) DynamicInvokeImpl(Object[])

呼び出しリスト全体を処理します。Processes the full invocation list.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

このマルチキャスト デリゲートと指定されたオブジェクトが等しいかどうかを確認します。Determines whether this multicast delegate and the specified object are equal.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

このインスタンスのハッシュ コードを返します。Returns the hash code for this instance.

GetInvocationList() GetInvocationList() GetInvocationList() GetInvocationList()

このマルチキャスト デリゲートの呼び出しリストを呼び出し順に返します。Returns the invocation list of this multicast delegate, in invocation order.

GetMethodImpl() GetMethodImpl() GetMethodImpl() GetMethodImpl()

現在の MulticastDelegate が表す静的メソッドを返します。Returns a static method represented by the current MulticastDelegate.

GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext)

SerializationInfo オブジェクトに、このインスタンスをシリアル化するために必要なデータをすべて格納します。Populates a SerializationInfo object with all the data needed to serialize this instance.

GetType() GetType() GetType() GetType()

現在のインスタンスの Type を取得します。Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

現在の Object の簡易コピーを作成します。Creates a shallow copy of the current Object.

(Inherited from Object)
RemoveImpl(Delegate) RemoveImpl(Delegate) RemoveImpl(Delegate) RemoveImpl(Delegate)

対象の MulticastDelegate の呼び出しリストから、指定したデリゲートと等しい要素を削除します。Removes an element from the invocation list of this MulticastDelegate that is equal to the specified delegate.

ToString() ToString() ToString() ToString()

現在のオブジェクトを表す文字列を返します。Returns a string that represents the current object.

(Inherited from Object)

演算子

Equality(MulticastDelegate, MulticastDelegate) Equality(MulticastDelegate, MulticastDelegate) Equality(MulticastDelegate, MulticastDelegate) Equality(MulticastDelegate, MulticastDelegate)

2 つの MulticastDelegate オブジェクトが等しいかどうかを判断します。Determines whether two MulticastDelegate objects are equal.

Inequality(MulticastDelegate, MulticastDelegate) Inequality(MulticastDelegate, MulticastDelegate) Inequality(MulticastDelegate, MulticastDelegate) Inequality(MulticastDelegate, MulticastDelegate)

2 つの MulticastDelegate オブジェクトが等しくないかどうかを判断します。Determines whether two MulticastDelegate objects are not equal.

プロパティ

Method Method Method Method

デリゲートによって表されるメソッドを取得します。Gets the method represented by the delegate.

(Inherited from Delegate)
Target Target Target Target

現在のデリゲートがインスタンス メソッドを呼び出す対象のクラス インスタンスを取得します。Gets the class instance on which the current delegate invokes the instance method.

(Inherited from Delegate)

拡張メソッド

GetMethodInfo(Delegate) GetMethodInfo(Delegate) GetMethodInfo(Delegate) 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