FileRegistrationHelper 为文件类型注册默认打开方式

FileRegistrationHelper转自【http://www.cnblogs.com/hdl217/archive/2010/11/09/1872983.html】

public class FileRegistrationHelper 
    { 
        public static void SetFileAssociation(string extension, string progID) 
        { 
            // Create extension subkey 
            SetValue(Registry.ClassesRoot, extension, progID); 
 
            // Create progid subkey 
            string assemblyFullPath = System.Reflection.Assembly.GetExecutingAssembly().Location.Replace("/", @""); 
            StringBuilder sbShellEntry = new StringBuilder(); 
            sbShellEntry.AppendFormat(""{0}" "%1"", assemblyFullPath); 
            SetValue(Registry.ClassesRoot, progID + @"shellopencommand", sbShellEntry.ToString()); 
            StringBuilder sbDefaultIconEntry = new StringBuilder(); 
            sbDefaultIconEntry.AppendFormat(""{0}",0", assemblyFullPath); 
            SetValue(Registry.ClassesRoot, progID + @"DefaultIcon", sbDefaultIconEntry.ToString()); 
 
            // Create application subkey 
            SetValue(Registry.ClassesRoot, @"Applications" + Path.GetFileName(assemblyFullPath), "", "NoOpenWith"); 
        } 
 
        private static void SetValue(RegistryKey root, string subKey, object keyValue) 
        { 
            SetValue(root, subKey, keyValue, null); 
        } 
        private static void SetValue(RegistryKey root, string subKey, object keyValue, string valueName) 
        { 
            bool hasSubKey = ((subKey != null) && (subKey.Length > 0)); 
            RegistryKey key = root; 
 
            try 
            { 
                if (hasSubKey) key = root.CreateSubKey(subKey); 
                key.SetValue(valueName, keyValue); 
            } 
            finally 
            { 
                if (hasSubKey && (key != null)) key.Close(); 
            } 
        } 
    }

使用方式：

在app启动时调用方法
        public void SetFileAssociation()
        {
            string extension = ".test";
            string title = "something here";
            string extensionDescription = "some description";
            FileRegistrationHelper.SetFileAssociation(
              extension, title + "." + extensionDescription);
        }

补充：程序需要管理员权限，方法：

勾选项目属性》安全性》启用clickonce安全性设定，勾选后项目目录Properties下会看见新文件app.manifest，修改该文件：

        <requestedExecutionLevel level="asInvoker" uiAccess="false" />

修改后：

        <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />

保存后回到项目属性》安全性》启用clickonce安全性设定，取消勾选。

事实上注册默认打开方式通常由安装程序执行。