为什么TextBox控件上没有IsReadOnlyChanged事件？

I was adding some workaround code to fix the bug outlined in Is this a bug in DotNet 4 WPF Spell Checking?, (When a WPF TextBox changes Enabled, Visible or ReadOnly states, any SpellCheck custom dictionaries get dropped off until you disable and re-enable SpellCheck) and the simplest fix seemed to be to handle the IsVisibleChanged, IsEnabledChanged, and IsReadOnlyChanged events.

我正在添加一些解决方法代码来修复在这是DotNet 4 WPF拼写检查中的错误中概述的错误？（当WPF TextBox更改Enabled，Visible或ReadOnly状态时，任何SpellCheck自定义词典都会被删除，直到您禁用并重新启动启用S​​pellCheck）和最简单的修复似乎是处理IsVisibleChanged，IsEnabledChanged和IsReadOnlyChanged事件。

Simple, right? Except there is no IsReadOnlyChanged event. Anybody know why and what the best way to trap a change to IsReadOnly in a WPF TextBox would be?

简单吧？除了没有IsReadOnlyChanged事件。任何人都知道为什么以及在WPF TextBox中捕获对IsReadOnly的更改的最佳方法是什么？

2 个解决方案

#1

You can always follow dependency property change with DependencyPropertyDescriptor.AddValueChanged

您始终可以使用DependencyPropertyDescriptor.AddValueChanged跟踪依赖项属性更改

DependencyPropertyDescriptor.FromProperty(TextBoxBase.IsReadOnlyProperty)
                            .AddValueChanged(ctrl, OnReadOnlyChanged)

#2

Create a custom class and handle OnPropertyChanged event. Sth like this:

创建自定义类并处理OnPropertyChanged事件。是这样的：

public class MyTextBox: TextBox
{
    public MyTextBox() { }
    protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
    {
        base.OnPropertyChanged(e);
        if (e.Property.ToString() == "IsReadOnly")
        {
            // here you are sure that ContentPropertyhas changed
        }
    }
}