获取 Control.KeyDown 上的字符?

问题描述

在处理 Control.OnKeyPress 事件时，有一个 KeyPressEventArgs 包含一个 KeyChar.

When handling Control.OnKeyPress event, there is a KeyPressEventArgs that contains a KeyChar.

出于可用性原因，我需要完全相同的 KeyChar 但在处理 OnKeyDown 事件时.

For usability reasons I need exactly the same KeyChar but when handling OnKeyDown event.

KeyEventArgs 不包含任何与字符相关的数据.我的意思是，如果在有或没有 Shift 的情况下按下 A 键，它不会影响 KeyCode、KeyData 或 键值.使用另一种语言时也是如此，我仍然得到大写的英文值.

The KeyEventArgs does not contains any char related data. I mean, if press the A key with or without Shift its not affecting the KeyCode, KeyData or KeyValue. The same when using another language, i still getting capital english values.

如何在KeyDown事件中获取KeyPressEventArgs.KeyChar?

谢谢.

推荐答案

转换它.这是将A"转换为a"的简单函数.它只转换 [A-Z] 集合中的大写字符.值 32 是 'A' 和 'a' 之间的差异.当然您可以将其扩展到您的要求，或者在此处询问功能.

Convert it. Here is simple function for converting 'A' to 'a'. It converts only capital chars from [A-Z] set. The value 32 is diff between 'A' and 'a'.. Sure you can extend it to your requirements, or ask for feature here.

char getChar( KeyEventArgs e )
{
 int keyValue = e.KeyValue;
 if ( !e.Shift && keyValue >= (int) Keys.A && keyValue <= (int) Keys.Z )
  return (char)(keyValue + 32);
 return (char) keyValue;
}

如果您需要它与您当前的文化一起使用，您应该覆盖 ProcessKeyMessage 控制方法:

if you need it to works with your current culture you should override ProcessKeyMessage Control method:

protected override bool ProcessKeyMessage( ref Message m )
{
 if ( ( m.Msg == 0x102 ) || ( m.Msg == 0x106 ) ) // this is special - don't remove
 {
  char c = (char) m.WParam; // here is your char for OnKeyDown event ;)
 }
 return base.ProcessKeyMessage( ref m );
}

希望对您有所帮助.

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