How Do I...Pass An Object to a Server By Value?

The Pass an Object to a Server by Reference section illustrated that local objects are always passed by value when you call a remote function. To demonstrate this concept, you need change the previous example.

The first step is to create the object you need to pass to the server.

using System; namespace Microsoft.Samples.Remoting.RemotingSamples { [serializable] public class ForwardMe { private int mValue = 1; public void CallMe() { mValue++; } public int getValue() { return mValue; } } } Imports System Namespace Microsoft.Samples.Remoting.RemotingSamples Public Class ForwardMe Dim mValue As Integer = 1 Public Sub CallMe() mValue += 1 End Sub Public Function getValue() As Integer Return mValue End Function End Class End Namespace using namespace System; using namespace System::Runtime::Remoting; namespace RemotingSamples { [Serializable] public ref class ForwardMe { private: int mValue; public: ForwardMe() { mValue = 1; } void CallMe() { mValue++; } int getValue() { return mValue; } }; }

This class is flagged with the [serializable] custom attribute, which allows it to be streamed to and from the server. When you run the sample, the client reports the value of the counter to be one. Since the server calls the CallMe method on the object five times, the value of the counter when the object is returned is six. Note that the client has two instances of the ForwardMe class after calling the remote method: the instance that was passed and a copy of the instance that was returned.