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Dynamic/Transparent Proxy using DynamicProxy.NET

, 21 Oct 2003
Learn how easy it is to create Dynamic/Transparent proxies in .NET using DynamicProxy.NET
dynamicproxy.zip
DynamicProxy
bin
Release
DynamicProxy.dll
docs
tutorial.png
tutorial2.png
DynamicProxy.csproj.user
DynamicProxyTest
App.ico
bin
Release
DynamicProxy.dll
DynamicProxyTest.csproj.user
TestClasses
DynamicProxyTest.exe
dynamicproxytutorial.zip
DynamicProxyTutorial
App.ico
bin
Release
DynamicProxy.dll
DynamicProxyTutorial.exe
DynamicProxyTutorial.csproj.user
using System;
using System.IO;
using System.Security.Principal;

namespace DynamicProxyTutorial {

	/// <summary>
	/// Hand made proxy for the IFileViewer.
	/// </summary>
	public class FileViewerProxy : IFileViewer {
		/// <summary>
		/// User ID that is allowed to read/write from files
		/// </summary>
		private string allowedUserID;
		/// <summary>
		/// The real fileviewer that we're proxying
		/// </summary>
		private IFileViewer realFileViewer;

		public FileViewerProxy(string filePath, string allowedUserID) {
			this.allowedUserID = allowedUserID;
			realFileViewer = new FileViewer(filePath);
		}

		/// <summary>
		/// Checks if the current user is the same as the allowed user. 
		/// If it isn't a SecurityException is thrown
		/// </summary>
		/// <exception cref="SecuritException">If the current user isn't allowed to 
		/// read/write from the file, this exception is thrown</exception>
		private void checkPermission() {
			if (WindowsIdentity.GetCurrent().Name != allowedUserID) {
				throw new SecurityException("From : " + this.GetType().Name + "\r\nUserID '" + 
							WindowsIdentity.GetCurrent().Name + 
							" isn't allowed to read/write from the file: '" + 
							realFileViewer.FilePath + "'. " + 
							"Allowed user: '" + allowedUserID + "'");
			}
		}

		// ---------------- Proxy methods  -------------
		// It's these method wrappers that DynamicProxy.NET creates 
		// for you in a generic way

		public void ReadFromFile() {
			checkPermission();
			realFileViewer.ReadFromFile();
		}

		public string Content {
			get {
				return realFileViewer.Content;
			}
		}

		public string FilePath {
			get {
				return realFileViewer.FilePath;
			}
		}
	}
}

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About the Author

SKI_BUM
Web Developer
Denmark Denmark
10 years experience in software design. In my job as a software architect I work with Java and J2EE. .net is so far only a hobby project, but nonetheless interesting Wink | ;-)

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