WPF TextBox事件TextChanged PreviewTextInput不会触发 [英] WPF TextBox events TextChanged PreviewTextInput do not fire

问题描述

我已经从一所大学继承了一个更大的C#项目(不见了，所以我再也不能问他了).我在VS2012 + .Net4.6上在该项目中，我第一次将WPF文本框添加到非模式窗口.问题是:我无法更改文本框中的文本.

I have inherited an bigger C# Project from a college (hes gone so I can't ask him anymore). Im on VS2012 + .Net4.6 The first time in this Project I added a WPF Textbox to a nonmodal Window. The problem is: I cant change the text in the TextBox.

我发现以下事实:

• 文本框不是只读的
• 我可以使用退格键和Delete键，没有其他键
• 带有粘贴的上下文菜单，复制剪切的效果与预期的一样
• 如果我打开窗口模式，可以在框中更改文本
• 如果我以非模式打开书房窗口，我可以捕获事件PreviewKeyUp，PreviewKeyDown，KeyUp和KeyDown
• 但是我无法捕获PreviewTextInput，TextInput(正常)和TextChanged.
• 当我从头开始创建WPF项目时，一切正常.

我们有自己的WPF-Window-Style，但这无关紧要，无论我是否在窗口中使用此样式.

We have an own WPF-Window-Style, but it doesn't matter, if I use this style in the window or not.

有人可以告诉我在模态/非模态Windows中TextBoxes的行为有何不同.您能否给我一个提示，在这里我可以寻找FromTheScratchProject和我们的项目之间行为的修改?我可以以某种方式调试事件处理吗?

Can anybody tell me whats the difference of the behavior of TextBoxes in modal / nonmodal Windows. Could you give me a tip, where I could look for a Modification of the behavior between the FromTheScratchProject and our project? Can I debug the eventhandling somehow?

非常感谢

推荐答案

似乎您的项目是WinForms/Win32和WPF的混合.

It seems like your project is a mix of WinForms/Win32 and WPF.

如果以以下方式实例化窗口，则非模式窗口将正确捕获键盘事件:

If you instantiate your window in following way, your non-modal window will catch the keyboard events correctly:

Window wpfWindow = new Window();
ElementHost.EnableModelessKeyboardInterop(wpfWindow);
wpfWindow.Show();

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