webbrowser 静音(刷新、点击网页的声音)（包括flash静音）

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public enum INTERNETFEATURELIST          {              FEATURE_OBJECT_CACHING = 0,              FEATURE_ZONE_ELEVATION = 1,              FEATURE_MIME_HANDLING = 2,              FEATURE_MIME_SNIFFING = 3,              FEATURE_WINDOW_RESTRICTIONS = 4,              FEATURE_WEBOC_POPUPMANAGEMENT = 5,              FEATURE_BEHAVIORS = 6,              FEATURE_DISABLE_MK_PROTOCOL = 7,              FEATURE_LOCALMACHINE_LOCKDOWN = 8,              FEATURE_SECURITYBAND = 9,              FEATURE_RESTRICT_ACTIVEXINSTALL = 10,              FEATURE_VALIDATE_NAVIGATE_URL = 11,              FEATURE_RESTRICT_FILEDOWNLOAD = 12,              FEATURE_ADDON_MANAGEMENT = 13,              FEATURE_PROTOCOL_LOCKDOWN = 14,              FEATURE_HTTP_USERNAME_PASSWORD_DISABLE = 15,              FEATURE_SAFE_BINDTOOBJECT = 16,              FEATURE_UNC_SAVEDFILECHECK = 17,              FEATURE_GET_URL_DOM_FILEPATH_UNENCODED = 18,              FEATURE_TABBED_BROWSING = 19,              FEATURE_SSLUX = 20,              FEATURE_DISABLE_NAVIGATION_SOUNDS = 21,              FEATURE_DISABLE_LEGACY_COMPRESSION = 22,              FEATURE_FORCE_ADDR_AND_STATUS = 23,              FEATURE_XMLHTTP = 24,              FEATURE_DISABLE_TELNET_PROTOCOL = 25,              FEATURE_FEEDS = 26,              FEATURE_BLOCK_INPUT_PROMPTS = 27,              FEATURE_ENTRY_COUNT = 28          }            private const int SET_FEATURE_ON_THREAD = 0x00000001;          private const int SET_FEATURE_ON_PROCESS = 0x00000002;          private const int SET_FEATURE_IN_REGISTRY = 0x00000004;          private const int SET_FEATURE_ON_THREAD_LOCALMACHINE = 0x00000008;          private const int SET_FEATURE_ON_THREAD_INTRANET = 0x00000010;          private const int SET_FEATURE_ON_THREAD_TRUSTED = 0x00000020;          private const int SET_FEATURE_ON_THREAD_INTERNET = 0x00000040;          private const int SET_FEATURE_ON_THREAD_RESTRICTED = 0x00000080;            [DllImport("urlmon.dll")]          [PreserveSig]          [return: MarshalAs(UnmanagedType.Error)]          static extern int CoInternetSetFeatureEnabled(               INTERNETFEATURELIST FeatureEntry,               [MarshalAs(UnmanagedType.U4)] int dwFlags,               bool fEnable);             [DllImport("winmm.dll")]         public static extern int waveOutGetVolume(IntPtr h, out uint dwVolume);           [DllImport("winmm.dll")]         public static extern int waveOutSetVolume(IntPtr h, uint dwVolume);             private void Form1_Load(object sender, EventArgs e)         {             try             {                // waveOutSetVolume(0, 0xFFFF); //禁止当前进程发出声音                 CoInternetSetFeatureEnabled(INTERNETFEATURELIST.FEATURE_DISABLE_NAVIGATION_SOUNDS, SET_FEATURE_ON_PROCESS, true);                 uint _savedVolume;                 waveOutGetVolume(IntPtr.Zero, out _savedVolume);                   this.FormClosing += delegate                 {                     // restore the volume upon exit                     waveOutSetVolume(IntPtr.Zero, _savedVolume);                 };                   // mute                 waveOutSetVolume(IntPtr.Zero, 0);               }             catch (Exception ex)             {                 Console.WriteLine(ex.Message);             } } }