如何清除TextBox，以使默认的Undo方法仍然起作用? [英] How to clear a TextBox so that the default Undo method still functions?
问题描述
我已经寻找了一段时间，还没有找到简单或正确的方法来解决以下问题.
I've been looking for a while now and haven't found an easy or correct way to solve the following issue.
我有一个带有 ShortcutsEnabled = true 的多行文本框，它当然允许用户轻松撤消或重做使用键盘快捷键(例如 Ctrl + Z ).
现在，我希望实现一个按钮，该按钮可清除TextBox的文本，但仍允许用户使用默认的undo功能来撤消操作.
I have a multi-line TextBox with the ShortcutsEnabled = true which, of course, allows the user to easily undo or redo any changes made by using the keyboard shortcuts (e.g. Ctrl + Z).
Now I wish to implement a button that clears the text of the TextBox but still allow the user to undo the action by using the default undo function.
从文本框中清除文本很容易:
Clearing the text from the TextBox is easy:
myTextBox.Clear();
//or
myTextBox.Text = string.Empty;
问题在于，以这种方式替换文本时，默认的撤消功能不起作用.
但是，如果用户选择所有文本( Ctrl + A )并手动单击 Delete ，则TextBox将变为空并且用户仍可以恢复通过 Ctrl + Z 删除数据.
The problem is that the default undo function does not work when replacing the text these ways.
However, if the user selects all the text ( Ctrl + A ) and hits Delete manually, the TextBox becomes empty and the user can still restore the deleted data by Ctrl + Z.
我知道编写自己的 Undo 或 Redo 实现可以使我获得所需的结果，但是必须有另一种方法.
我只需要能熟练地模仿手动全选并删除代码中的方法即可.
I know that writing my own implementation of Undo or Redo would probably allow me to get the desired result but there has to be another way.
I simply need to be ably to mimic the manual select all and delete method in code.
这是我需要帮助的地方，如何实现?
And this is where I need some help, how can I implement this?
TextBox似乎没有我可以调用的默认删除，删除或替换文本函数.
作为概念验证，我尝试使用 Cut 方法(或 Ctrl + X )实现此目的，实际上可以实现我想要的功能.唯一的缺点是，这将替换潜在的重要剪贴板数据.我也尝试过解决此问题的方法，但是在进行了一些研究之后，似乎没有任何正确"或至少伟大"的方式来还原剪贴板数据.
TextBox doesn't seem to have a default Delete, Remove or Replace text function that I can call.
As a proof of concept I've tried implementing this using the Cut method (or Ctrl + X ) , which actually does what I want. The only downside is that this replaces potentially important clipboard data. I've tried coming up with a workaround for this as well, but after doing some research there doesn't seem to be any "correct" or at least "great" way to restore clipboard data.
var cbData = Clipboard.GetText();
myTextBox.SelectAll();
myTextBox.Cut();
Clipboard.Clear();
if(!string.IsNullOrEmpty(cbData))
Clipboard.SetText(cbData);
TLDR;
如何以与用户手动操作相同的方式从文本框中删除文本?这样，仍可以调用默认的 Undo 方法来恢复已删除的文本吗?
How can I delete the text from a TextBox in code the same way a user would do manually? So that the default Undo method can still be called to restore the deleted text?
推荐答案
如何聚焦文本框，选择所有文本，然后模拟退格键?与用户手动清除TextBox相同.(至少，我以这种方式清除了文本字段)
What about focusing the TextBox, selecting all text and then simulating a backspace? It's the same as the user manually clearing the TextBox. (Atleast, I clear text fields in this way)
textBox1.Focus();
textBox1.SelectAll();
SendKeys.Send("{BACKSPACE}");
部分相关的事实-在WPF中，无论您如何更改文本， Undo 和 Redo 方法始终可以正常运行
A bit of partially relevant fact - In WPF, no matter how you change the text, the Undo and Redo methods always function properly.
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