wpf 当文本输入到文本框时，立即触发 TextChanged 事件
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Having TextChanged Event Fire Immediately as Text is Typed into TextBox
提问by thecoop
On a wpf TextBoxthat has an TextChangedevent, it seems to only fires when focus is taken away from the textbox; but not as individual characters are typed in.
在TextBox具有TextChanged事件的 wpf上，它似乎仅在焦点从文本框移开时触发；但不是输入单个字符。
Is there an event similar to TextChangedthat fires immediatelywhen a character is typed into the textbox, rather than when focus changes?
是否有类似于在文本框中键入字符而不是焦点更改时立即TextChanged触发的事件？
回答by Aaron McIver
You can bind the Textproperty and make use of the UpdateSourceTrigger.
您可以绑定Text属性并使用UpdateSourceTrigger。
UpdateSourceTrigger=PropertyChanged
By setting it to PropertyChanged, you will get a notification each and every time the text changes.
通过将其设置为PropertyChanged，您将在每次文本更改时收到通知。
回答by H.B.
TextChangeddoesfire as soon as the text is changed.
TextChanged确实只要文本更改火灾。
(If you have a binding on Textthat is notthe same thing, it is completely independent from the event.)
（如果你有一个绑定，Text那不是一回事，它完全独立于事件。）
回答by Bathineni
@Anron answer is correct but i think it works only when we are doing Data binding (using MVVM).
@Anron 答案是正确的，但我认为它仅在我们进行数据绑定（使用 MVVM）时才有效。
From @thecorp question what i have understood is he is trying to it in code behind file.
从@thecorp 的问题中，我了解到他正在尝试在代码隐藏文件中进行。
You can take advantage of "KeyDown" and "KeyUp" events of textbox or if you are using data binding Aaron anwer should resolve your issue.
您可以利用文本框的“KeyDown”和“KeyUp”事件，或者如果您使用数据绑定 Aaron anwer 应该可以解决您的问题。
