TextBox RaiseEvent KeyDownEvent无法工作... (附加代码)

Question

尝试通过raiseEvent连接到textBox -但我在textBox文本中看不到键值。我可以看到textbox事件"OnKeyDownEvent“在断点处停止了--但是我不明白为什么KeyEventArgs ( Key.D0 )的文本没有插入到textbox文本中。

代码：

if( currentTextBoxInFocus != null )
{
    KeyEventArgs k = new KeyEventArgs( Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, System.Environment.ProcessorCount, Key.D0 );
    //KeyEventArgs k = new KeyEventArgs( Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, 0, Key.D0 );
    k.RoutedEvent = UIElement.KeyDownEvent;
    currentTextBoxInFocus.RaiseEvent( k );
    k.RoutedEvent = UIElement.KeyUpEvent;
    currentTextBoxInFocus.RaiseEvent( k );
}

Answer 1

您正在尝试使用按键事件作为输入源，而它们实际上用于指示来自操作系统的键盘输入的结果。这些事件不会导致将文本添加到TextBox。相反，它们指示何时将键盘输入输入到控件(如TextBox)中。

如果您想从代码模拟输入文本，只需将所需的文本添加到TextBox属性中：

int caret = currentTextBoxInFocus.CaretIndex;
currentTextBoxInFocus.Text = String.Format("{0}0{1}", currentTextBoxInFocus.Text.Substring(0, caret), currentTextBoxInFocus.Text.Substring(currentTextBoxInFocus.CaretIndex));
currentTextBoxInFocus.CaretIndex = caret + 1;