Proxy Pattern

Proxy Pattern 

Gamma Categorization: Structural Design Pattern
Summary:Provide a surrogate or placeholder for another object to control access to it.

Sample Code

Problem: We want to create a proxy class to intercept the server connection.

Code

public class StorageServer

{

    private string ServerURL;

    public void Connect() 

    {  

        System.Console.WriteLine("Connecting to server."); 

    }

    public void UploadFile() 

    { 

        System.Console.WriteLine("Uploading a file."); 

    }

    

    public List<string> ListFiles() 

    { 

        System.Console.WriteLine("Listing server files."); 

        return new List<string>(); 

    }

}

public class StorageProxy

{

    StorageServer server = new StorageServer();

    public void Connect() => server.Connect();

    public void UploadFile() => server.UploadFile();

    public List<string> ListFiles() => server.ListFiles();

}

Usage

var storage = new StorageProxy();

storage.Connect();

storage.ListFiles();

Output

Connecting to server.

Listing server files.