.net - 如何从 DataGridView 数据单元格中获取 keypressed、keydown 事件

Question

我需要在控制单元格编辑期间接收按键事件DataGridView。

从我在网上找到的内容来看，DataGridView它旨在将所有关键事件传递DataGridView给单元格编辑控件，您无法轻松获取这些事件。

我发现这段代码可以捕获这些事件以进行DataGrid控制，但这不适用于DataGridView.

Answer 1

试试这个：

class KeyPressAwareDataGridView : DataGridView
{
    protected override void OnControlAdded(ControlEventArgs e)
    {
        SubscribeEvents(e.Control);
        base.OnControlAdded(e);
    }

    protected override void OnControlRemoved(ControlEventArgs e)
    {
        UnsubscribeEvents(e.Control);
        base.OnControlRemoved(e);
    }

    private void SubscribeEvents(Control control)
    { 
        control.KeyPress += new KeyPressEventHandler(control_KeyPress);
        control.ControlAdded += new ControlEventHandler(control_ControlAdded);
        control.ControlRemoved += new ControlEventHandler(control_ControlRemoved);

        foreach (Control innerControl in control.Controls)
        {
            SubscribeEvents(innerControl);
        }
    }

    private void UnsubscribeEvents(Control control)
    {
        control.KeyPress -= new KeyPressEventHandler(control_KeyPress);
        control.ControlAdded -= new ControlEventHandler(control_ControlAdded);
        control.ControlRemoved -= new ControlEventHandler(control_ControlRemoved);

        foreach (Control innerControl in control.Controls)
        {
            UnsubscribeEvents(innerControl);
        }
    }

    private void control_ControlAdded(object sender, ControlEventArgs e)
    {
        SubscribeEvents(e.Control);
    }

    private void control_ControlRemoved(object sender, ControlEventArgs e)
    {
        UnsubscribeEvents(e.Control);
    }

    private void control_KeyPress(object sender, KeyPressEventArgs e)
    {
        // Apply your logic here whether this is the key pressed event you need.
        // (e.g. "if(SelectedCells != null)")
        MessageBox.Show(e.KeyChar.ToString());
    }
}

Answer 2

终于想通了。这个难题有两个部分 - 从单元格编辑控件获取键和从 DataGridView 本身获取键。这是我的代码。要使用它，您只需要订阅自定义事件：keyPressHook。

class KeyPressAwareDataGridView : DataGridView
{

    protected override void OnControlAdded(ControlEventArgs e)
    {
        this.subscribeEvents(e.Control);
        base.OnControlAdded(e);
    }

    protected override void OnControlRemoved(ControlEventArgs e)
    {
        this.unsubscribeEvents(e.Control);
        base.OnControlRemoved(e);
    }

    protected override bool ProcessDataGridViewKey(KeyEventArgs e)
    {
        bool procesedInternally = false;

        if (this.keyPressHook != null)
        {
            this.keyPressHook(this, e);
            procesedInternally = e.SuppressKeyPress;
        }

        if (procesedInternally)
        {
            return true;
        }
        else
        {
            return base.ProcessDataGridViewKey(e);
        }
    }


    private void subscribeEvents(Control control)
    {
        control.KeyDown += new KeyEventHandler(this.control_KeyDown);
        control.ControlAdded += new ControlEventHandler(this.control_ControlAdded);
        control.ControlRemoved += new ControlEventHandler(this.control_ControlRemoved);

        foreach (Control innerControl in control.Controls)
        {
            this.subscribeEvents(innerControl);
        }
    }

    private void unsubscribeEvents(Control control)
    {
        control.KeyDown -= new KeyEventHandler(this.control_KeyDown);
        control.ControlAdded -= new ControlEventHandler(this.control_ControlAdded);
        control.ControlRemoved -= new ControlEventHandler(this.control_ControlRemoved);

        foreach (Control innerControl in control.Controls)
        {
            this.unsubscribeEvents(innerControl);
        }
    }

    private void control_ControlAdded(object sender, ControlEventArgs e)
    {
        this.subscribeEvents(e.Control);
    }

    private void control_ControlRemoved(object sender, ControlEventArgs e)
    {
        this.unsubscribeEvents(e.Control);
    }

    private void control_KeyDown(object sender, KeyEventArgs e)
    {
        if (this.keyPressHook != null)
        {
            this.keyPressHook(this, e);
        }
    }

    public event KeyEventHandler keyPressHook;

}

Answer 3

或者，对于那些不想在这种情况下创建我们自己的 DataGridView 的用户；有这个方法（在 C++ 中）：它使用 DataGridView 的 EditingControlShowing 事件。

private: System::Boolean fIsNonNumeric;
private: static System::Windows::Forms::KeyEventHandler^ EventKeyDown = nullptr;
private: static System::Windows::Forms::KeyPressEventHandler^ EventKeyPress = nullptr;
private: System::Void dataGridView_KeyDown(System::Object^  sender, System::Windows::Forms::KeyEventArgs^  e) 
{
  fIsNonNumeric= false;

  // Determine whether the keystroke is a number from the top of the keyboard.
  if ( e->KeyCode < Keys::D0 || e->KeyCode > Keys::D9 )
  {
    // Determine whether the keystroke is a number from the keypad.
    if ( e->KeyCode < Keys::NumPad0 || e->KeyCode > Keys::NumPad9 )
    {
      // Determine whether the keystroke is a backspace.
      if ( e->KeyCode != Keys::Back )
      {
        // A non-numerical keystroke was pressed.
        // Set the flag to true and evaluate in KeyPress event.
        fIsNonNumeric = true;
      }
    }
  }
}

private: System::Void dataGridView_KeyPress(System::Object^  sender, System::Windows::Forms::KeyPressEventArgs^  e) 
{
  // Should we stop the character from being entered...?
  if ( fIsNonNumeric == true )
    e->Handled = true;
}

private: System::Void dataGridView_Machines_EditingControlShowing(System::Object^  sender, System::Windows::Forms::DataGridViewEditingControlShowingEventArgs^  e) 
{
  if (nullptr == EventKeyDown)
    EventKeyDown = (gcnew System::Windows::Forms::KeyEventHandler( this, &ProjectForm::dataGridView_KeyDown ));

  if (nullptr == EventKeyPress)
    EventKeyPress = (gcnew System::Windows::Forms::KeyPressEventHandler( this, &ProjectForm::dataGridView_KeyPress ));

  e->Control->KeyDown -= EventKeyDown;
  e->Control->KeyPress -= EventKeyPress;

  e->Control->KeyDown += EventKeyDown;
  e->Control->KeyPress += EventKeyPress;
}

Answer 4

也许不如上面 Mladen Prajdic 的回答那么好，但可能会更容易一些，具体取决于您的情况。您可以覆盖表单或控件本身的 ProcessCmdKey 方法，在那里处理击键，并检查当前单元格。

Answer 5

您必须覆盖 DataGridViewCell/DataGridViewTextBoxCell/otherTypes 并处理派生类中的 key* 事件。

Answer 6

通过收听 EditingControlShowing 并向每个新的编辑控件添加关键侦听器，我找到了部分解决方案。

这使我可以访问大多数键，但我仍然没有箭头键。

我会试试 Eren Aygunes 的建议。