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using System;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using System.Security.Permissions;
namespace System.Media {
/// <include file='doc\systemsounds.uex' path='docs/doc[@for="SystemSounds"]/*' />
[HostProtection(UI = true)]
public sealed class SystemSounds {
static volatile SystemSound asterisk;
static volatile SystemSound beep;
static volatile SystemSound exclamation;
static volatile SystemSound hand;
static volatile SystemSound question;
private SystemSounds() {
}
/// <include file='doc\systemsounds.uex' path='docs/doc[@for="SystemSounds.Asterisk"]/*' />
public static SystemSound Asterisk {
get {
if (asterisk == null) {
asterisk = new SystemSound(NativeMethods.MB_ICONASTERISK);
}
return asterisk;
}
}
/// <include file='doc\systemsounds.uex' path='docs/doc[@for="SystemSounds.Beep"]/*' />
public static SystemSound Beep {
get {
if (beep == null) {
beep = new SystemSound(0);
}
return beep;
}
}
/// <include file='doc\systemsounds.uex' path='docs/doc[@for="SystemSounds.Exclamation"]/*' />
public static SystemSound Exclamation {
get {
if (exclamation == null) {
exclamation = new SystemSound(NativeMethods.MB_ICONEXCLAMATION);
}
return exclamation;
}
}
/// <include file='doc\systemsounds.uex' path='docs/doc[@for="SystemSounds.Hand"]/*' />
public static SystemSound Hand {
get {
if (hand == null) {
hand = new SystemSound(NativeMethods.MB_ICONHAND);
}
return hand;
}
}
/// <include file='doc\systemsounds.uex' path='docs/doc[@for="SystemSounds.Question"]/*' />
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;
}
}
/// <include file='doc\systemsounds.uex' path='docs/doc[@for="SystemSound.SystemSound"]/*' />
[HostProtection(UI = true)]
public class SystemSound {
private int soundType;
internal SystemSound(int soundType) {
this.soundType = soundType;
}
/// <include file='doc\systemsounds.uex' path='docs/doc[@for="SystemSound.Play"]/*' />
[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)]
[ResourceExposure(ResourceScope.None)]
internal static extern bool MessageBeep(int type);
}
}
}
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