Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/sys/system/Media/SystemSounds.cs

@@ -0,0 +1,109 @@
+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);
+        }
+    }
+}