The Proxy Pattern

The Proxy Pattern


The Proxy Pattern controls access to objects, promoting flexibility and abstraction in C# code.

This pattern introduces a surrogate object, known as a proxy, that acts as an intermediary between clients and actual objects.

Understanding the Proxy Pattern

The Proxy Pattern revolves around the concept of a proxy object that represents and controls access to a real object.

The proxy intercepts client requests, performs any necessary operations, and forwards requests to the real object if necessary.

This pattern provides a level of indirection, enabling flexible object access and control.

Benefits of the Proxy Pattern

The Proxy Pattern offers several advantages, including:

  • Controlled Access: It allows for controlling access to objects, ensuring their proper usage and protecting them from misuse.
  • Flexibility: It promotes flexibility by decoupling clients from the actual objects they operate on.
  • Abstraction: It provides a level of abstraction, hiding the implementation details of the real objects.
  • Performance Optimisation: It can improve performance by caching object results or providing alternative implementations.
  • Protection: It can protect sensitive objects from unauthorised access or malicious attacks.
  • Remote Invocation: It facilitates remote object invocation, enabling interaction with objects across a network.

Types of Proxy Patterns

The Proxy Pattern encompasses several variations, each with its specific characteristics:

  • Remote Proxy: Provides a surrogate for objects located in different address spaces.
  • Cache Proxy: Caches object results to improve performance.
  • Virtual Proxy: Delays object creation until it’s needed.
  • Protection Proxy: Controls access to sensitive objects.
  • Factory Proxy: Creates instances of other objects based on specific criteria.
  • Intercepting Proxy: Intercepts client requests and performs additional operations, such as logging or security checks.

Implementing the Proxy Pattern in C#

To illustrate the implementation of the Proxy Pattern in C#, consider a simplified scenario of accessing a remote object through a proxy:

Real Object:

The real object represents the remote resource.

public class RemoteObject
    public void ExecuteOperation()
        // Perform remote operation

Proxy Object:

The proxy object acts as an intermediary between clients and the real object.

public class Proxy
    private RemoteObject remoteObject;

    public Proxy()
        remoteObject = new RemoteObject();

    public void ExecuteOperation()
        // Perform additional operations, such as logging or authentication

Using the Proxy Pattern:

To use the proxy pattern for accessing a remote object:

Proxy proxy = new Proxy();

This example demonstrates a basic implementation of the Proxy Pattern in C# for accessing a remote object through a proxy.

The proxy pattern can be extended to handle more complex remote object scenarios and security requirements.


The Proxy Pattern is a valuable tool for controlling object access and promoting flexibility and abstraction in C# code.

It enables controlled access to sensitive objects, improves performance, and simplifies object interactions.

By leveraging the Proxy Pattern, developers can create more secure, efficient, and adaptable applications.


Hi, my name is Stephen Finchett. I have been a software engineer for over 30 years and worked on complex, business critical, multi-user systems for all of my career. For the last 15 years, I have been concentrating on web based solutions using the Microsoft Stack including ASP.Net, C#, TypeScript, SQL Server and running everything at scale within Kubernetes.