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  • C# 文本框 TextChanged 延时触发

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    public partial class DelayTextBox : TextBox
        {
            #region private globals
    
            private System.Timers.Timer DelayTimer; // used for the delay
            private bool TimerElapsed = false; // if true OnTextChanged is fired.
            private bool KeysPressed = false; // makes event fire immediately if it wasn't a keypress
            
            
            #endregion
    
            #region object model
    
            // Delay property
            private int delayTime = 3000;
    
            public int DelayTime
            {
                get { return delayTime; }
                set { delayTime = value; }
            }
            
            #endregion
    
            #region ctor
    
            public DelayTextBox()
            {
                InitializeComponent();
    
                // Initialize Timer
                DelayTimer = new System.Timers.Timer(delayTime);
                DelayTimer.Elapsed += new ElapsedEventHandler(DelayTimer_Elapsed);
            }
    
            #endregion
    
            #region event handlers
    
            void DelayTimer_Elapsed(object sender, ElapsedEventArgs e)
            {
                // stop timer.
                DelayTimer.Enabled = false;
    
                // set timer elapsed to true, so the OnTextChange knows to fire
                TimerElapsed = true;
    
                // use invoke to get back on the UI thread.
                this.Invoke(new DelayOverHandler(DelayOver), null);
            }
    
            #endregion
    
            #region overrides
    
            protected override void OnKeyPress(KeyPressEventArgs e)
            {
                if (!DelayTimer.Enabled)
                    DelayTimer.Enabled = true;
                else
                {
                    DelayTimer.Enabled = false;
                    DelayTimer.Enabled = true;
                }
    
                KeysPressed = true;
                base.OnKeyPress(e);
            }
    
            protected override void OnTextChanged(EventArgs e)
            {
                // if the timer elapsed or text was changed by something besides a keystroke
                // fire base.OnTextChanged
                if (TimerElapsed || !KeysPressed)
                {
                    TimerElapsed = false;
                    KeysPressed = false;
                    base.OnTextChanged(e);
                }
            }
    
            #endregion
    
            #region delegates
    
            public delegate void DelayOverHandler();
    
            #endregion
    
            #region private helpers
    
            private void DelayOver()
            {
                OnTextChanged(new EventArgs());
            }
    
            #endregion
    
        }
    复制代码
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  • 原文地址:https://www.cnblogs.com/51net/p/10307835.html
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