DispatcherHooks.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / System / Windows / Threading / DispatcherHooks.cs / 1 / DispatcherHooks.cs
                        
                        
                            using System.Security; 
using System.Security.Permissions;

namespace System.Windows.Threading
{ 
    /// 
    ///     Additional information provided about a dispatcher. 
    ///  
    public sealed class DispatcherHooks
    { 
        /// 
        ///     An event indicating the the dispatcher has no more operations to process.
        /// 
        ///  
        ///     Note that this event will be raised by the dispatcher thread when
        ///     there is no more pending work to do. 
        ///      
        ///     Note also that this event could come before the last operation is
        ///     invoked, because that is when we determine that the queue is empty. 
        ///     Callers must have UIPermission(PermissionState.Unrestricted) to call this API.
        /// 
        /// 
        ///     Critical: accesses _dispatcherInactive 
        ///     TreatAsSafe: link-demands
        ///  
        public event EventHandler DispatcherInactive 
        {
            [SecurityCritical] 
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)]
            add
            {
                lock(_instanceLock) 
                {
                    _dispatcherInactive += value; 
                } 
            }
            [SecurityCritical] 
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)]
            remove
            {
                lock(_instanceLock) 
                {
                    _dispatcherInactive -= value; 
                } 
            }
        } 

        /// 

        ///     An event indicating that an operation was posted to the dispatcher.
        ///  
        /// 
        ///     Typically this is due to the BeginInvoke API, but the Invoke API can 
        ///     also cause this if any priority other than DispatcherPriority.Send is 
        ///     specified, or if the destination dispatcher is owned by a different
        ///     thread. 
        ///     
        ///     Note that any thread can post operations, so this event can be
        ///     raised by any thread.
        ///     Callers must have UIPermission(PermissionState.Unrestricted) to call this API. 
        /// 
        ///  
        ///     Critical: accesses _operationPosted 
        ///     TreatAsSafe: link-demands
        ///  
        public event DispatcherHookEventHandler OperationPosted
        {
            [SecurityCritical]
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] 
            add
            { 
                lock(_instanceLock) 
                {
                    _operationPosted += value; 
                }
            }
            [SecurityCritical]
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] 
            remove
            { 
                lock(_instanceLock) 
                {
                    _operationPosted -= value; 
                }
            }
        }
 
        /// 

        ///     An event indicating that an operation was completed. 
        ///  
        /// 
        ///     Note that this event will be raised by the dispatcher thread after 
        ///     the operation has completed.
        ///     Callers must have UIPermission(PermissionState.Unrestricted) to call this API.
        /// 
        ///  
        ///     Critical: accesses _operationCompleted
        ///     TreatAsSafe: link-demands 
        ///  
        public event DispatcherHookEventHandler OperationCompleted
        { 
            [SecurityCritical]
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)]
            add
            { 
                lock(_instanceLock)
                { 
                    _operationCompleted += value; 
                }
            } 
            [SecurityCritical]
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)]
            remove
            { 
                lock(_instanceLock)
                { 
                    _operationCompleted -= value; 
                }
            } 
        }

        /// 
        ///     An event indicating that the priority of an operation was changed. 
        /// 
        ///  
        ///     Note that any thread can change the priority of operations, 
        ///     so this event can be raised by any thread.
        ///     Callers must have UIPermission(PermissionState.Unrestricted) to call this API. 
        /// 
        /// 
        ///     Critical: accesses _operationPriorityChanged
        ///     TreatAsSafe: link-demands 
        /// 
        public event DispatcherHookEventHandler OperationPriorityChanged 
        { 
            [SecurityCritical]
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] 
            add
            {
                lock(_instanceLock)
                { 
                    _operationPriorityChanged += value;
                } 
            } 
            [SecurityCritical]
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] 
            remove
            {
                lock(_instanceLock)
                { 
                    _operationPriorityChanged -= value;
                } 
            } 
        }
 
        /// 
        ///     An event indicating that an operation was aborted.
        /// 
        ///  
        ///     Note that any thread can abort an operation, so this event
        ///     can be raised by any thread. 
        ///     Callers must have UIPermission(PermissionState.Unrestricted) to call this API. 
        /// 
        ///  
        ///     Critical: accesses _operationAborted
        ///     TreatAsSafe: link-demands
        /// 
        public event DispatcherHookEventHandler OperationAborted 
        {
            [SecurityCritical] 
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] 
            add
            { 
                lock(_instanceLock)
                {
                    _operationAborted += value;
                } 
            }
            [SecurityCritical] 
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] 
            remove
            { 
                lock(_instanceLock)
                {
                    _operationAborted -= value;
                } 
            }
        } 
 
        // Only we can create these things.
        internal DispatcherHooks() 
        {
        }

        ///  
        ///     Critical: accesses _operationAborted
        ///     TreatAsSafe: no exposure 
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        internal void RaiseDispatcherInactive(Dispatcher dispatcher) 
        {
            EventHandler dispatcherInactive = _dispatcherInactive;
            if(dispatcherInactive != null)
            { 
                dispatcherInactive(dispatcher, EventArgs.Empty);
            } 
        } 

        ///  
        ///     Critical: accesses _operationAborted
        ///     TreatAsSafe: no exposure
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        internal void RaiseOperationPosted(Dispatcher dispatcher, DispatcherOperation operation)
        { 
            DispatcherHookEventHandler operationPosted = _operationPosted; 

            if(operationPosted != null) 
            {
                operationPosted(dispatcher, new DispatcherHookEventArgs(operation));
            }
        } 

        ///  
        ///     Critical: accesses _operationAborted 
        ///     TreatAsSafe: no exposure
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        internal void RaiseOperationCompleted(Dispatcher dispatcher, DispatcherOperation operation)
        {
            DispatcherHookEventHandler operationCompleted = _operationCompleted; 

            if(operationCompleted != null) 
            { 
                operationCompleted(dispatcher, new DispatcherHookEventArgs(operation));
            } 
        }

        /// 
        ///     Critical: accesses _operationAborted 
        ///     TreatAsSafe: no exposure
        ///  
        [SecurityCritical, SecurityTreatAsSafe] 
        internal void RaiseOperationPriorityChanged(Dispatcher dispatcher, DispatcherOperation operation)
        { 
            DispatcherHookEventHandler operationPriorityChanged = _operationPriorityChanged;

            if(operationPriorityChanged != null)
            { 
                operationPriorityChanged(dispatcher, new DispatcherHookEventArgs(operation));
            } 
        } 

        ///  
        ///     Critical: accesses _operationAborted
        ///     TreatAsSafe: no exposure
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        internal void RaiseOperationAborted(Dispatcher dispatcher, DispatcherOperation operation)
        { 
            DispatcherHookEventHandler operationAborted = _operationAborted; 

            if(operationAborted != null) 
            {
                operationAborted(dispatcher, new DispatcherHookEventArgs(operation));
            }
        } 

        private object _instanceLock = new object(); 
 
        /// 
        ///     Do not expose to partially trusted code. 
        /// 
        [SecurityCritical]
        private EventHandler _dispatcherInactive;
 
        /// 
        ///     Do not expose to partially trusted code. 
        ///  
        [SecurityCritical]
        private DispatcherHookEventHandler _operationPosted; 

        /// 
        ///     Do not expose to partially trusted code.
        ///  
        [SecurityCritical]
        private DispatcherHookEventHandler _operationCompleted; 
 
        /// 
        ///     Do not expose to partially trusted code. 
        /// 
        [SecurityCritical]
        private DispatcherHookEventHandler _operationPriorityChanged;
 
        /// 
        ///     Do not expose to partially trusted code. 
        ///  
        [SecurityCritical]
        private DispatcherHookEventHandler _operationAborted; 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DispatcherHooks.cs source code in C# .NET

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