CallContext.GetData(String) Method
Definition
Important
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Retrieves an object with the specified name from the CallContext.
public:
static System::Object ^ GetData(System::String ^ name);
public static object GetData (string name);
[System.Security.SecurityCritical]
public static object GetData (string name);
static member GetData : string -> obj
[<System.Security.SecurityCritical>]
static member GetData : string -> obj
Public Shared Function GetData (name As String) As Object
Parameters
- name
- String
The name of the item in the call context.
Returns
The object in the call context associated with the specified name.
- Attributes
Exceptions
The immediate caller does not have infrastructure permission.
Examples
The following code example demonstrates the use of the GetData method to transmit Principal and Identity Objects to a remote location for identification. To view the code for the LogicalCallContextData
class used in this sample, see the example for the ILogicalThreadAffinative interface. To view the code for the client class used in the sample, see the example for the CallContext class. To view the code for the server class used in this sample, see the example for the RegisterActivatedServiceType class.
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
Applies to
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