将PreviewKeyDown中收到的密钥转换为字符串 [英] Convert received keys in PreviewKeyDown to a string

问题描述

我在窗口上使用PreviewKeyDown事件接收条形码扫描仪的所有键. KeyEventArgs是一个枚举，没有给我实际的字符串.我不想使用TextInput，因为某些键可能会由控件本身处理，并且可能不会冒泡到TextInput事件.

I am using PreviewKeyDown event on a window to receive all the keys from a barcode scanner. The KeyEventArgs is an enumeration and does not given me the actual string. I dont want to use TextInput as some of the keys may get handled by the control itself and may not bubble up to the TextInput event.

我正在寻找一种将在PreviewKeyDown中获得的键转换为实际字符串的方法. 我看了一下InputManager，TextCompositionManager等，但没有找到我给出按键列表的方法，它返回了一个字符串. TextCompositionManager或某些东西必须将这些Key转换为TextInput中可用的字符串.

I am looking for a way to convert the the Keys that I get in PreviewKeyDown to actual string. I looked at the InputManager, TextCompositionManager etc but I am not finding a way where I give the list of keys and it comes back with a string. TextCompositionManager or something must be converting these Keys to a string which is what is available in TextInput.

推荐答案

这是我正在使用的事件. KeyDown获取键，PreviewTextInput获取实际文本.因此，键之间的某处将转换为文本.

Here is the event that I am using. The KeyDown gets the keys and the PreviewTextInput gets the actual text. So somewhere in between the keys are getting converted to text.

 public Window1()
            {
                InitializeComponent();
                TextCompositionManager.AddPreviewTextInputStartHandler(this, new TextCompositionEventHandler(Window_PreviewTextInput));
                this.AddHandler(Window.KeyDownEvent, new System.Windows.Input.KeyEventHandler(Window_KeyDown), true);
            }

    private void Window_PreviewTextInput(object sender, TextCompositionEventArgs e)
            {
            }

    private void Window_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
            {
            }

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