如何使用PropertyChangedCallBack

我有一个绑定到依赖属性的TextBox，我已经实现了一个PropertyChangedCallBack函数，当文本更改时我需要调用textbox.ScrollToEnd（）但我不能因为PropertChanged函数需要是静态的，有没有办法绕过这个？

static FrameworkPropertyMetadata propertyMetaData = new FrameworkPropertyMetadata("MyWindow", FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, new PropertyChangedCallback(TextProperty_PropertyChanged)); public static readonly DependencyProperty TextProperty = DependencyProperty.Register("TextProperty", typeof(string), typeof(OutputPanel), propertyMetaData); private void TextProperty_PropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { textbox.ScrollToEnd(); //An object reference is required for the non-static field. } public string Text { get { return this.GetValue(TextProperty) as string; } set { this.SetValue(TextProperty, value); //textbox.ScrollToEnd(); // I originally called it here but I think it should be in the property changed function. } } 

谢谢，

埃蒙·

Answer 1

DependencyObject是引发事件的对象。 你需要将obj转换为你需要的类型。 例如

 TextBox textbox = (TextBox)obj; textbox.ScrollToEnd();