Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Sys / System / Media / SystemSounds.cs / 1 / SystemSounds.cs
using System; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; using System.Runtime.InteropServices; using System.Security.Permissions; namespace System.Media { ///[HostProtection(UI = true)] public sealed class SystemSounds { static SystemSound asterisk; static SystemSound beep; static SystemSound exclamation; static SystemSound hand; static SystemSound question; private SystemSounds() { } /// public static SystemSound Asterisk { get { if (asterisk == null) { asterisk = new SystemSound(NativeMethods.MB_ICONASTERISK); } return asterisk; } } /// public static SystemSound Beep { get { if (beep == null) { beep = new SystemSound(0); } return beep; } } /// public static SystemSound Exclamation { get { if (exclamation == null) { exclamation = new SystemSound(NativeMethods.MB_ICONEXCLAMATION); } return exclamation; } } /// public static SystemSound Hand { get { if (hand == null) { hand = new SystemSound(NativeMethods.MB_ICONHAND); } return hand; } } /// public static SystemSound Question { get { if (question == null) { question = new SystemSound(NativeMethods.MB_ICONQUESTION); } return question; } } private class NativeMethods { // Constructor added because of FxCop rules private NativeMethods() {} internal const int MB_ICONHAND = 0x000010, MB_ICONQUESTION = 0x000020, MB_ICONEXCLAMATION = 0x000030, MB_ICONASTERISK = 0x000040; } } /// [HostProtection(UI = true)] public class SystemSound { private int soundType; internal SystemSound(int soundType) { this.soundType = soundType; } /// [SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts")] public void Play() { IntSecurity.UnmanagedCode.Assert(); try { SafeNativeMethods.MessageBeep(soundType); } finally { System.Security.CodeAccessPermission.RevertAssert(); } } private class SafeNativeMethods { // Constructor added because of FxCop rules private SafeNativeMethods() {} [DllImport(ExternDll.User32, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)] internal static extern bool MessageBeep(int type); } } }
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