一个在WPF中模拟 Application.DoEvents的类

最新推荐文章于 2022-07-16 14:38:19 发布

原创最新推荐文章于 2022-07-16 14:38:19 发布 · 2.3k 阅读

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#wpf #object #function #class #null

这是一个在WPF环境下模拟System.Windows.Forms.Application.DoEvents功能的静态类DispatcherHelper。通过DispatcherFrame和Dispatcher.CurrentDispatcher.BeginInvoke实现后台任务处理，确保UI的响应性。

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    /// <summary>
    ///
    /// </summary>
    public static class DispatcherHelper
    {
        /// <summary>
        /// Simulate Application.DoEvents function of <see cref=" System.Windows.Forms.Application"/> class.
        /// </summary>
        [SecurityPermissionAttribute ( SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode )]
        public static void DoEvents ( )
        {
            DispatcherFrame frame = new DispatcherFrame ( );
            Dispatcher.CurrentDispatcher.BeginInvoke ( DispatcherPriority.Background,
                new DispatcherOperationCallback ( ExitFrames ), frame );

            try
            {
                Dispatcher.PushFrame ( frame );
            }
            catch ( InvalidOperationException )
            {
            }
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="f"></param>
        /// <returns></returns>
        private static object ExitFrames ( object frame )
        {
            ( ( DispatcherFrame ) frame ).Continue = false;