SystemSounds.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Sys / System / Media / SystemSounds.cs / 1305376 / SystemSounds.cs
                        

                        
                            using System; 
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using System.Runtime.Versioning; 
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)] 
            [ResourceExposure(ResourceScope.None)]
            internal static extern bool MessageBeep(int type); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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