C#修改文件关联方式

以修改系统的mp3文件为例。

修改后，mp3文件图标变为程序的图标，双击
打开mp3程序时自动调用自己的程序，右键mp3文件可以看到关联的本程序选项。

想详细了解原理的，参考MSDN中文档：MSDN->MSDN Library->Win32 and COM Development->User Interface->Windows Shell -> Shell Developer's Guide -> Shell Extensibility ->Extending Explorers -> Customizing File Types (File Associations 一节 /en-us/library/cc147473(VS.85.aspx
/en-us/library/cc144158(VS.85.aspx --------------------------具
体代码如下-Visual Studio 2008中测试通过------------------------------ using System; using System.Collections.Generic; using ponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using
System.Windows.Forms; using Microsoft.Win32; using System.Runtime.InteropServices; //使用 DllImport 和StructLayout namespace FileAssociationSample { public partial class Form1 : Form { #region public enum HChangeNotifyFlags [Flags] public enum HChangeNotifyFlags { SHCNF_DWORD = 0x0003, SHCNF_IDLIST = 0x0000, SHCNF_PATHA = 0x0001, SHCNF_PATHW = 0x0005, SHCNF_PRINTERA =
0x0002, SHCNF_PRINTERW = 0x0006, SHCNF_FLUSH = 0x1000,
SHCNF_FLUSHNOWAIT = 0x2000 } #endregion // enum HChangeNotifyFlags #region enum HChangeNotifyEventID [Flags] enum HChangeNotifyEventID
{ SHCNE_ALLEVENTS = 0x7FFFFFFF, SHCNE_ASSOCCHANGED = 0x08000000, SHCNE_ATTRIBUTES = 0x00000800, SHCNE_CREATE = 0x00000002,
SHCNE_DELETE = 0x00000004, SHCNE_DRIVEADD = 0x00000100,
SHCNE_DRIVEADDGUI = 0x00010000, SHCNE_DRIVEREMOVED = 0x00000080, SHCNE_EXTENDED_EVENT = 0x04000000, SHCNE_FREESPACE = 0x00040000, SHCNE_MEDIAINSERTED = 0x00000020, SHCNE_MEDIAREMOVED =
0x00000040, SHCNE_MKDIR = 0x00000008, SHCNE_NETSHARE = 0x00000200, SHCNE_NETUNSHARE = 0x00000400, SHCNE_RENAMEFOLDER = 0x00020000, SHCNE_RENAMEITEM = 0x00000001, SHCNE_RMDIR = 0x00000010,
SHCNE_SERVERDISCONNECT = 0x00004000, SHCNE_UPDATEDIR =
0x00001000, SHCNE_UPDATEIMAGE = 0x00008000, } #endregion // enum HChangeNotifyEventID [DllImport("shell32.dll"] static extern void
SHChangeNotify(HChangeNotifyEventID wEventId,
HChangeNotifyFlags uFlags, IntPtr dwItem1, IntPtr dwItem2; public
Form1( { InitializeComponent(; } private void button1_Click(object sender, EventArgs e { string fileType = textBox1.Text; if (!fileType.StartsWith("." { fileType = "." + fileType; textBox1.Text = fileType; } //Application.StartupPath 这个只是路径 // mandLine ; 这个包含参数 string appName =
Application.ExecutablePath; RegistryKey hk_root = Registry.ClassesRoot;
//HKEY_CLASSES_ROOT //注册自己程序的the ProgID if (null ==
hk_root.OpenSubKey(".dat" //The proper format of a ProgID key name is [Vendor or Application].[Component].[Version], separated by periods and with no spaces, as in Word.Document.6. The Version portion is optional but strongly recommended (see Using Versioned PROGIDs. { RegistryKey progID = hk_root.CreateSubKey("widebright.dat"; if (progID == null { MessageBox.Show("创建widebright.dat 类型ProgID时失败";
hk_root.Close(; return; } //创建（默认）键值，显示给用户看的文件类型描述progID.SetValue("", "专用的dat文件 ", RegistryValueKind.String ; //文件显示的图标RegistryKey defaultIcon = progID.CreateSubKey("DefaultIcon"; if (defaultIcon == null { MessageBox.Show("创建dat 类型的DefaultIcon时失败"; progID.Close(;
hk_root.Close(; return; } //创建（默认）键值，指定文件显示图标
defaultIcon.SetValue("", appName + ",0", RegistryValueKind.String; defaultIcon.Close(; //指定文件动作 RegistryKey shell = progID.CreateSubKey("shell"; if (shell == null
{ MessageBox.Show("创建.dat 类型的shell键时失败"; progID.Close(; hk_root.Close(; return; } //open 动作------------------------ RegistryKey open =
shell.CreateSubKey("open"; if (open == null { MessageBox.Show("创建.dat 类型的open键时失败"; shell.Close(; progID.Close(; hk_root.Close(;
return; } RegistryKey command = open.CreateSubKey("command"; if (command == null { MessageBox.Show("创建.dat 类型的command键时失败"; open.Close(; shell.Close(; progID.Close(; hk_root.Close(; return; } command.SetValue("", "\"" + appName + "\" \"%1\"" , RegistryValueKind.String; command.Close(; open.Close(; progID.Close(; } //修改对应文件类型的默认的关联程序 //因为在系统里面一把mp3都是已经注册的了，所以这里只是简单修改一下关联 RegistryKey dat=
hk_root.OpenSubKey(".dat", true; if (dat!=null { dat.SetValue("", ".dat", RegistryValueKind.String; //指定用我们上面的ProgID打开mp3文件 dat.Close(; } hk_root.Close(; //通知系统，文件关联已经是作用，不然可能要等到系统重启才看到效果
SHChangeNotify(HChangeNotifyEventID.SHCNE_ASSOCCHANGED,HChangeNotify Flags.SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero; MessageBox.Show("dat文件的关联已经修改成功了！"; } private void Form1_Load(object sender, EventArgs e { string [] arguments= Environment.GetCommandLineArgs(; if (arguments.Length > 1 { if (arguments[1].IndexOf(".dat" > 0 { MessageBox.Show("数据文件关联成功：" + arguments[1] + ",hh !"; } } } } }。