如何在WPF中延迟调用文本框的textchanged事件 [英] How to make delay in calling textchanged event of textbox in wpf

问题描述

我有从Textbox继承的自定义控件.

I have custom control inherited from Textbox.

我想延迟调用textchanged事件.

I want to make delay in calling textchanged event.

 Observable.FromEventPattern<TextChangedEventHandler, TextChangedEventArgs>(
                handler => this.TextChanged += handler,
                handler => this.TextChanged -= handler
                ).Throttle(TimeSpan.FromMilliseconds(600))
                      .Where(e =>
                          {
                              var control= e.Sender as TextBox;
                              return control!= null && !string.IsNullOrEmpty(control.Text);
                          })

                      .Subscribe(x => Control_TextChanged(x.Sender, x.EventArgs));

问题是出现错误提示，由于当前线程无权访问，因此无法访问Text属性.

Problem is it is giving error saying, cannot access Text property as current thread does not have access.

有人可以请教吗?

谢谢，维沙尔

推荐答案

您可以使用 ObserveOnDispatcher 扩展方法，并且具有类似以下内容:

You can use ObserveOnDispatcher extension method and have something like:

Observable.FromEventPattern<TextChangedEventHandler, TextChangedEventArgs>(
                    ev => TextChanged += ev,
                    ev => TextChanged -= ev)
                          .Where(t => !string.IsNullOrEmpty(Text))
                          .Throttle(TimeSpan.FromMilliseconds(600))
                          .ObserveOnDispatcher()
                          .Subscribe(e => HandleTextChanged(e.EventArgs));

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