导入注册表文件，注册dll

       //注册非根目录下在文件
　　  [DllImport(@"ffdshow\ffdshow.ax")]
        private static extern void DllRegisterServer();  
        DllRegisterServer();

　　　　//导入注册表

            if (File.Exists(@"ffdshow\register.reg")) 
                {
                    Process.Start("regedit", string.Format(" /s {0}", @"ffdshow\register.reg")); 
                }
        //软件卸载
        DialogResult dia= DevComponents.DotNetBar.MessageBoxEx.Show(null, "重要提醒：软件运行所必须组件丢失，本软件将自动卸载，是否继续？", "警告！", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
        if (dia == DialogResult.Yes)
        {
            RegistryKey  regKey=Registry.LocalMachine.OpenSubKey (@"SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products");
            GetProductCode(regKey);
            ProcessStartInfo StartInfo = new ProcessStartInfo();
            StartInfo.FileName =Environment.SystemDirectory   +"\\Msiexec.exe";
            StartInfo.Arguments = "/X "+_regCode;
            StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            StartInfo.UseShellExecute = false;
            StartInfo.RedirectStandardError = false;
            StartInfo.RedirectStandardInput = true;
            StartInfo.RedirectStandardOutput = true;
            StartInfo.CreateNoWindow = true;
            Process pro = new Process();
            pro.StartInfo = StartInfo;
            pro.Start();
            pro.WaitForExit();
        }

        private string _regCode = string.Empty;
        private void GetProductCode(RegistryKey _registryKey)
        {
            RegistryKey key = _registryKey;
            if (key.SubKeyCount == 0)
            {
                string[] valueNames = key.GetValueNames();
                if (!valueNames.Contains("Contact")) return;
                else if (key.GetValue("Contact").ToString().Trim() != "CompanyName") return;
                if (!valueNames.Contains("DisplayName")) return;
                else if (key.GetValue("DisplayName").ToString().Trim() != "FileName") return;
                if (!valueNames.Contains("UninstallString")) return;
                else
                {
                    string strtmp = key.GetValue("UninstallString").ToString();
                    _regCode = strtmp.Substring(strtmp.IndexOf('{'));
                }
            }
            else
            {
                if (_regCode.Trim() != string.Empty) return;
                string[] subKeyNames = key.GetSubKeyNames();
                foreach (string str2 in subKeyNames)
                {
                    GetProductCode(key.OpenSubKey(str2));
                }
            }
        }
        #endregion