CallContext.GetData メソッドとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

CallContext.GetData メソッド

CallContext から指定した名前のオブジェクトを取得します。

名前空間: System.Runtime.Remoting.Messaging
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Shared Function GetData
 ( _
    name As String _
) As Object

Visual Basic (使用法)

Dim name As String
Dim returnValue As Object

returnValue = CallContext.GetData(name)

public static Object GetData (
    string name
)

C++

public:
static Object^ GetData (
    String^ name
)

public static Object GetData (
    String name
)

JScript

public static function GetData
 (
    name : String
) : Object

パラメータ

name: 呼び出しコンテキストの項目の名前。

例外

例外の種類	条件
SecurityException	直前の呼び出し元に、インフラストラクチャアクセス許可がありません。

使用例

GetData メソッドを使用して、識別のためにリモートの場所にプリンシパルオブジェクトと ID オブジェクトを送信する例を次のコードに示します。サンプルで使用する LogicalCallContextData クラスのコードを表示するには、ILogicalThreadAffinative インターフェイスのトピックの例を参照してください。サンプルで使用するクライアントクラスのコードを表示するには、CallContext クラスのトピックの例を参照してください。この例で使用されているサーバークラスのコードを確認するには、RegisterActivatedServiceType クラスの例を参照してください。

Visual Basic

Imports System
Imports System.Text
Imports System.Runtime.Remoting.Messaging
Imports System.Security.Principal
Imports System.Security.Permissions

Public Class HelloServiceClass
   Inherits MarshalByRefObject
   
   Private Shared n_instances As
 Integer
   Private instanceNum As Integer
  
   
   Public Sub New()
      n_instances += 1
      instanceNum = n_instances
      Console.WriteLine(Me.GetType().Name + "
 has been created.  Instance # = {0}", instanceNum)
   End Sub 'New

   
   Protected Overrides Sub
 Finalize()
      Console.WriteLine("Destroyed instance {0} of HelloServiceClass.",
 instanceNum)
      MyBase.Finalize()
   End Sub 'Finalize
  
   <PermissionSet(SecurityAction.LinkDemand)> _
   Public Function HelloMethod(name As
 [String]) As [String]
      
      'Extract the call context data
      Dim data As LogicalCallContextData =
 CType(CallContext.GetData("test data"), LogicalCallContextData)
      Dim myPrincipal As IPrincipal = data.Principal
      
      'Check the user identity
      If myPrincipal.Identity.Name = "Bob"
 Then
         Console.WriteLine()
         Console.WriteLine("Hello {0}, you are identified!",
 myPrincipal.Identity.Name)
         Console.WriteLine(data.numOfAccesses)
      Else
         Console.WriteLine("Go away! You are not identified!")
         Return [String].Empty
      End If
      
      ' calculate and return result to client    
      Return "Hi there " + name
 + "."
   End Function 'HelloMethod

End Class 'HelloServiceClass

using System;
using System.Text;
using System.Runtime.Remoting.Messaging;
using System.Security.Principal;
using System.Security.Permissions;

public class HelloServiceClass : MarshalByRefObject
 {

   static int n_instances;
   int instanceNum;

   public HelloServiceClass() {
      n_instances++;
      instanceNum = n_instances;
      Console.WriteLine(this.GetType().Name + " has been
 created.  Instance # = {0}", instanceNum);
   }


   ~HelloServiceClass() {
      Console.WriteLine("Destroyed instance {0} of HelloServiceClass.",
 instanceNum);      
   }


   [PermissionSet(SecurityAction.LinkDemand)]
   public String HelloMethod(String name) {

      //Extract the call context data
      LogicalCallContextData data = (LogicalCallContextData)CallContext.GetData("test
 data");      
      IPrincipal myPrincipal = data.Principal;
      
      //Check the user identity
      if(myPrincipal.Identity.Name == "Bob") {
         Console.WriteLine("\nHello {0}, you are identified!", myPrincipal.Identity.Name);
         Console.WriteLine(data.numOfAccesses);
      }
      else {
         Console.WriteLine("Go away! You are not identified!");
         return String.Empty;
      }

        // calculate and return result to client    
      return "Hi there " + name + ".";
   }
}

C++

using namespace System;
using namespace System::Text;
using namespace System::Runtime::Remoting::Messaging;
using namespace System::Security::Principal;
using namespace System::Security::Permissions;

ref class LogicalCallContextData;

public ref class HelloServiceClass: public
 MarshalByRefObject
{
private:
   static int n_instances;
   int instanceNum;

public:
   HelloServiceClass()
   {
      n_instances++;
      instanceNum = n_instances;
      Console::WriteLine(  "{0} has been created.  Instance # = {1}", this->GetType()->Name,
 instanceNum );
   }

   ~HelloServiceClass()
   {
      Console::WriteLine( "Destroyed instance {0} of HelloServiceClass.",
 instanceNum );
   }

   [SecurityPermissionAttribute(SecurityAction::Demand, Flags=SecurityPermissionFlag::Infrastructure)]
   String^ HelloMethod( String^ name )
   {
      //Extract the call context data
      LogicalCallContextData^ data = dynamic_cast<LogicalCallContextData^>(CallContext::GetData(
 "test data" ));
      IPrincipal^ myPrincipal = data->Principal;

      //Check the user identity
      if ( myPrincipal->Identity->Name == "Bob"
 )
      {
         Console::WriteLine( "\nHello {0}, you are identified!", myPrincipal->Identity->Name
 );
         Console::WriteLine( data->numOfAccesses );
      }
      else
      {
         Console::WriteLine( "Go away! You are not identified!" );
         return String::Empty;
      }

      // calculate and return result to client    
      return String::Format( "Hi there {0}.", name );
   }
};