Dot Net Script

using System;
using System.Security;
using System.Collections;
using Microsoft.Win32;

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//Thanks to the wonderfull people at http://www.mentalis.org/ for this class//
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namespace DotNetScriptEngine
{
	/// <summary>List of commands.</summary>
	internal struct CommandList 
	{
		/// <summary>
		/// Holds the names of the commands.
		/// </summary>
		public ArrayList Captions;
		/// <summary>
		/// Holds the commands.
		/// </summary>
		public ArrayList Commands;
	}
	/// <summary>Properties of the file association.</summary>
	internal struct FileType 
	{
		/// <summary>
		/// Holds the command names and the commands.
		/// </summary>
		public CommandList Commands;
		/// <summary>
		/// Holds the extension of the file type.
		/// </summary>
		public string Extension;
		/// <summary>
		/// Holds the proper name of the file type.
		/// </summary>
		public string ProperName;
		/// <summary>
		/// Holds the full name of the file type.
		/// </summary>
		public string FullName;
		/// <summary>
		/// Holds the name of the content type of the file type.
		/// </summary>
		public string ContentType;
		/// <summary>
		/// Holds the path to the resource with the icon of this file type.
		/// </summary>
		public string IconPath;
		/// <summary>
		/// Holds the icon index in the resource file.
		/// </summary>
		public short IconIndex;
	}
	/// <summary>Creates file associations for your programs.</summary>
	/// <example>The following example creates a file association for the type XYZ with a non-existent program.
	/// <br></br><br>VB.NET code</br>
	/// <code>
	/// Dim FA as New FileAssociation
	/// FA.Extension = "xyz"
	/// FA.ContentType = "application/myprogram"
	/// FA.FullName = "My XYZ Files!"
	/// FA.ProperName = "XYZ File"
	/// FA.AddCommand("open", "C:\mydir\myprog.exe %1")
	/// FA.Create
	/// </code>
	/// <br>C# code</br>
	/// <code>
	/// FileAssociation FA = new FileAssociation();
	/// FA.Extension = "xyz";
	/// FA.ContentType = "application/myprogram";
	/// FA.FullName = "My XYZ Files!";
	/// FA.ProperName = "XYZ File";
	/// FA.AddCommand("open", "C:\\mydir\\myprog.exe %1");
	/// FA.Create();
	/// </code>
	/// </example>
	public class FileAssociation 
	{
		/// <summary>Initializes an instance of the FileAssociation class.</summary>
		public FileAssociation() 
		{
			FileInfo = new FileType();
			FileInfo.Commands.Captions = new ArrayList();
			FileInfo.Commands.Commands = new ArrayList();
		}
		/// <summary>Gets or sets the proper name of the file type.</summary>
		/// <value>A String representing the proper name of the file type.</value>
		public string ProperName 
		{
			get 
			{
				return FileInfo.ProperName;
			}
			set 
			{
				FileInfo.ProperName = value;
			}
		}
		/// <summary>Gets or sets the full name of the file type.</summary>
		/// <value>A String representing the full name of the file type.</value>
		public string FullName 
		{
			get 
			{
				return FileInfo.FullName;
			}
			set 
			{
				FileInfo.FullName = value;
			}
		}
		/// <summary>Gets or sets the content type of the file type.</summary>
		/// <value>A String representing the content type of the file type.</value>
		public string ContentType 
		{
			get 
			{
				return FileInfo.ContentType;
			}
			set 
			{
				FileInfo.ContentType = value;
			}
		}
		/// <summary>Gets or sets the extension of the file type.</summary>
		/// <value>A String representing the extension of the file type.</value>
		/// <remarks>If the extension doesn't start with a dot ("."), a dot is automatically added.</remarks>
		public string Extension 
		{
			get 
			{
				return FileInfo.Extension;
			}
			set 
			{
				if (value.Substring(0, 1) != ".")
					value = "." + value;
				FileInfo.Extension = value;
			}
		}
		/// <summary>Gets or sets the index of the icon of the file type.</summary>
		/// <value>A short representing the index of the icon of the file type.</value>
		public short IconIndex 
		{
			get 
			{
				return FileInfo.IconIndex;
			}
			set 
			{
				FileInfo.IconIndex = value;
			}
		}
		/// <summary>Gets or sets the path of the resource that contains the icon for the file type.</summary>
		/// <value>A String representing the path of the resource that contains the icon for the file type.</value>
		/// <remarks>This resource can be an executable or a DLL.</remarks>
		public string IconPath 
		{
			get 
			{
				return FileInfo.IconPath;
			}
			set 
			{
				FileInfo.IconPath = value;
			}
		}
		/// <summary>Adds a new command to the command list.</summary>
		/// <param name="Caption">The name of the command.</param>
		/// <param name="Command">The command to execute.</param>
		/// <exceptions cref="ArgumentNullException">Caption -or- Command is null (VB.NET: Nothing).</exceptions>
		public void AddCommand(string Caption, string Command) 
		{
			if (Caption == null || Command == null)
				throw new ArgumentNullException();
			FileInfo.Commands.Captions.Add(Caption);
			FileInfo.Commands.Commands.Add(Command);
		}
		/// <summary>Creates the file association.</summary>
		/// <exceptions cref="ArgumentNullException">Extension -or- ProperName is null (VB.NET: Nothing).</exceptions>
		/// <exceptions cref="ArgumentException">Extension -or- ProperName is empty.</exceptions>
		/// <exceptions cref="SecurityException">The user does not have registry write access.</exceptions>
		public void Create() 
		{
			// remove the extension to avoid incompatibilities [such as DDE links]
			try 
			{
				Remove();
			} 
			catch (ArgumentException) {} // the extension doesn't exist
			
			// create the exception
			if (Extension == "" || ProperName == "")
				throw new ArgumentException();
			int cnt;
			
			try 
			{
				RegistryKey RegKey = Registry.ClassesRoot.CreateSubKey(Extension);
				RegKey.SetValue("", ProperName);
				
				if (ContentType != null && ContentType != "")
					RegKey.SetValue("Content Type", ContentType);
				
				RegKey.Close();
				RegKey = Registry.ClassesRoot.CreateSubKey(ProperName);
				RegKey.SetValue("", FullName);
				RegKey.Close();
				
				if (IconPath != "") 
				{
					RegKey = Registry.ClassesRoot.CreateSubKey(ProperName + "\\" + "DefaultIcon");
					RegKey.SetValue("", IconPath + "," + IconIndex.ToString());
					RegKey.Close();
				}

				for (cnt = 0; cnt < FileInfo.Commands.Captions.Count; cnt++) 
				{
					RegKey = Registry.ClassesRoot.CreateSubKey(ProperName + "\\" + "Shell" + "\\" + (String)FileInfo.Commands.Captions[cnt]);
					RegKey = RegKey.CreateSubKey("Command");
					RegKey.SetValue("", FileInfo.Commands.Commands[cnt]);
					RegKey.Close();
				}
			} 
			catch 
			{
				throw new SecurityException();
			}
		}
		/// <summary>Removes the file association.</summary>
		/// <exceptions cref="ArgumentNullException">Extension -or- ProperName is null (VB.NET: Nothing).</exceptions>
		/// <exceptions cref="ArgumentException">Extension -or- ProperName is empty -or- the specified extension doesn't exist.</exceptions>
		/// <exceptions cref="SecurityException">The user does not have registry delete access.</exceptions>
		public void Remove() 
		{
			if (Extension == null || ProperName == null)
				throw new ArgumentNullException();
			if (Extension == "" || ProperName == "")
				throw new ArgumentException();
			Registry.ClassesRoot.DeleteSubKeyTree(Extension);
			Registry.ClassesRoot.DeleteSubKeyTree(ProperName);
		}
		/// <summary>Holds the properties of the file type.</summary>
		private FileType FileInfo;
	}
}