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Getting Started with Remoting in .NET  : Page 2

Use remoting in .NET to let isolated processes communicate with each other and improve security and stability at the same time.




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Remoting makes an object in one process (the server) available to code in another process (the client). This is called marshalling, and there are two fundamentally different ways to marshal an object:
  • Marshal by value: the server creates a copy of the object passes the copy to the client.
  • Marshal by reference: the client creates a proxy for the object and then uses the proxy to access the object.
When a client makes a call to an object marshaled by value (MBV), the server creates an exact copy and sends that copy to the client. The client can then use the object's data and executable functionality directly within its own process or application domain without making additional calls to the server. To implement MBV you must either implement the ISerializable interface in your classes, or mark them with the <serializable()> attribute.

In contrast, when a client makes a call to an object marshaled by reference (MBR), the .NET framework creates a proxy in the client's application domain and the client uses that proxy to access the original object on the server. To implement MBR a class must, at minimum, extend the System.MarshalByRefObject class. Figure 1 illustrates the differences between MBV and MBR.

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