CallContext.GetData(String) Methode

Definition

Namespace:

System.Runtime.Remoting.Messaging

Assembly:

mscorlib.dll

Ruft ein Objekt mit dem angegebenen Namen aus CallContext ab.

public:
 static System::Object ^ GetData(System::String ^ name);

[System.Security.SecurityCritical]
public static object GetData (string name);

[<System.Security.SecurityCritical>]
static member GetData : string -> obj

Public Shared Function GetData (name As String) As Object

Parameter

name

String

Der Name des Elements im Aufrufkontext.

Gibt zurück

Object

Das Objekt im Aufrufkontext, das dem angegebenen Namen zugeordnet ist.

Attribute

SecurityCriticalAttribute

Ausnahmen

SecurityException

Der direkte Aufrufer verfügt nicht über die Berechtigung für die Infrastruktur.

Beispiele

Das folgende Codebeispiel veranschaulicht die Verwendung der GetData -Methode zum Übertragen von Prinzipal- und Identitätsobjekten an einen Remotestandort zur Identifizierung. Informationen zum Anzeigen des Codes für die klasse, die LogicalCallContextData in diesem Beispiel verwendet wird, finden Sie im Beispiel für die ILogicalThreadAffinative Schnittstelle. Informationen zum Anzeigen des Codes für die im Beispiel verwendete Clientklasse finden Sie im Beispiel für die CallContext -Klasse. Um den Code für die in diesem Beispiel verwendete Serverklasse anzuzeigen, sehen Sie sich das Beispiel für die -Klasse an RegisterActivatedServiceType .

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 );
   }
};

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);
   }

   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 + ".";
   }
}

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

   
   Protected Overrides Sub Finalize()
      Console.WriteLine("Destroyed instance {0} of HelloServiceClass.", instanceNum)
      MyBase.Finalize()
   End Sub
  
   <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