SystemSounds.cs source code in C# .NET

Source code for the .NET framework in C#

                        
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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