CallContext.GetData(String) 方法

定義

命名空間:

System.Runtime.Remoting.Messaging

組件:

mscorlib.dll

從 CallContext 擷取具有指定名稱的物件。

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

參數

name

String

呼叫內容中項目的名稱。

傳回

Object

與指定名稱關聯之呼叫內容中的物件。

屬性

SecurityCriticalAttribute

例外狀況

SecurityException

立即呼叫端沒有基礎結構使用權限。

範例

下列程式代碼範例示範如何使用 GetData 方法，將 主體和識別物件 傳輸至遠端位置以進行識別。 若要檢視此範例中使用的類別程式代碼 LogicalCallContextData ，請參閱 介面的 ILogicalThreadAffinative 範例。 若要檢視範例中使用的用戶端類別程序代碼，請參閱 類別的 CallContext 範例。 若要檢視此範例中使用的伺服器類別程序代碼，請參閱 類別的 RegisterActivatedServiceType 範例。

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