如何处理 DataGridViewCell 中的 KeyEvent？

Question

是否存在DataGridViewCell 的Keydown 事件？
我想要做的是当用户在特定单元格中输入时，他可以按 F1 以获得该特定列的帮助。并且会弹出一些表单...

这是什么活动？

Answer 1

我在论坛中找到了this 代码，它可以工作。

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
   DataGridViewTextBoxEditingControl tb = (DataGridViewTextBoxEditingControl)e.Control;
   tb.KeyPress += new KeyPressEventHandler(dataGridViewTextBox_KeyPress);    
   e.Control.KeyPress += new KeyPressEventHandler(dataGridViewTextBox_KeyPress);
}
    
private void dataGridViewTextBox_KeyPress(object sender, KeyPressEventArgs e)
{
   //when i press enter,bellow code never run?
   if (e.KeyChar==(char)Keys.Enter)
   {
      MessageBox.Show("You press Enter");
   }
}

Answer 2

DataGridViewCell 没有任何事件，但是您可以在DataGridView 本身上监听KeyDown 事件，然后查看选择了哪个单元格：

public void dataGridView_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.F1)
    {
        var selectedCell = dataGridView.SelectedCells[0];
        // do something with selectedCell...
    }
}

Answer 3

当用户在单元格中键入时，实际上是在为编辑目的而放置在单元格内的控件中键入。例如，字符串列类型实际上会创建一个 TextBox 以在单元格内使用，供用户输入。因此，在进行编辑时，您需要真正挂钩放置在单元格内的 TextBox 的 KeyDown 事件。

Answer 4

另一种解决方案是

private void grdDetalle_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
    {
        // Sólo queremos esta funcionalidad para determinadas columnas Clave y Nombre
        if ((grdDetalle.Columns[grdDetalle.CurrentCell.ColumnIndex].Name == "colClaveArticulo") ||
            (grdDetalle.Columns[grdDetalle.CurrentCell.ColumnIndex].Name == "colNombre"))
        {
            /// Workarround para que estando editando en las columnas del grid Clave y Nombre
            /// podamos detectar cuando se dio F4 para lanzar el dialogo de busqueda del
            /// articulo.
            e.Control.KeyDown += new KeyEventHandler(dataGridViewTextBox_KeyDown);
            e.Control.Leave += new EventHandler(dataGridViewTextBox_Leave);
        }
    }

    private void dataGridViewTextBox_Leave(object sender, EventArgs e)
    {

        if ((grdDetalle.Columns[grdDetalle.CurrentCell.ColumnIndex].Name == "colClaveArticulo") ||
           (grdDetalle.Columns[grdDetalle.CurrentCell.ColumnIndex].Name == "colNombre"))
        {
            try
            {
                (sender as DataGridViewTextBoxEditingControl).KeyDown -= 
                   new KeyEventHandler(dataGridViewTextBox_KeyDown);
            }
            catch (Exception ex)
            { }
        }
    }

    private void dataGridViewTextBox_KeyDown(object sender, KeyEventArgs e)
    {
        // F4 Pressed
        if ((grdDetalle.Columns[grdDetalle.CurrentCell.ColumnIndex].Name == "colClaveArticulo") ||
           (grdDetalle.Columns[grdDetalle.CurrentCell.ColumnIndex].Name == "colNombre"))
        {
            if (e.KeyCode == Keys.F4) // 115
            {
                MessageBox.Show("Oprimieron F4");
                e.Handled = true;
                e.SuppressKeyPress = true;
            }
        }
    }

Answer 5

我知道这是一个老问题，但我相信我在投票最多的答案上有所改进。

    IDataGridViewEditingControl _iDataGridViewEditingControl;
    private void SlotTimesDGV_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
    {
        if (_iDataGridViewEditingControl is DataGridViewComboBoxEditingControl)
        {
            DataGridViewComboBoxEditingControl iDataGridViewEditingControl = _iDataGridViewEditingControl as DataGridViewComboBoxEditingControl;
            iDataGridViewEditingControl.KeyPress -= SlotTimesDGV_EditingControlShowing_KeyPress;
        }
        if (e.Control is DataGridViewComboBoxEditingControl)
        {
            DataGridViewComboBoxEditingControl iDataGridViewEditingControl = e.Control as DataGridViewComboBoxEditingControl;
            iDataGridViewEditingControl.KeyPress += SlotTimesDGV_EditingControlShowing_KeyPress;
            _iDataGridViewEditingControl = iDataGridViewEditingControl;
        }
    }

    private void SlotTimesDGV_EditingControlShowing_KeyPress(object sender, KeyPressEventArgs e)
    {
        MessageBox.Show("");
    }

通过拥有 IDataGridViewEditingControl 的实例变量，您可以删除在移动单元格时会导致重复调用的 KeyPress 事件，并且您的事件不仅限于一种类型的单元格。

Answer 6

这段代码对我有用。

Form.KeyPreview = true;

Microsoft Docs 中的描述：“...(KeyPreview) 设置一个值，指示在将事件传递给具有焦点的控件之前表单是否会接收键事件。”。

Answer 7

覆盖 Form 类的虚函数 ProcessCmdKey 对我有用。

在 ProcessCmdKey 上返回 true 以防止进一步处理按键。 覆盖所有关键操作的覆盖函数

例如：

protected override bool ProcessCmdKey(ref Message msg, Keys keyData) //overridden virtual function
{
    if (keyData == Keys.Tab) //check to make sure it is the key I am interested in
    { 
        if (this.dataGridViewKeys.ContainsFocus) //make sure it is on the control, or any child controls, of the one I am interested in
        {
            this.dataGridViewKeys.EndEdit(); //do whatever action you want here
            if (this.dataGridViewKeys.CurrentRow.IsNewRow && this.dataGridViewKeys.Rows.Count > 1)
                this.dataGridViewKeys.CurrentCell = this.dataGridViewKeys.Rows[this.dataGridViewKeys.Rows.Count - 1].Cells[2];
            this.txtNoteData.Focus();
            return true;  //I return true to prevent further handling of the keypress
        }
    }
    return base.ProcessCmdKey(ref msg, keyData); //return this for keys you do not want to intercept
}

Answer 8

to this answer:

在您的解决方案中，您不应忘记取消监听事件

private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
  tb.KeyUp -= Tb_KeyUp;
}

在我的解决方案中，我订阅了 KeyUp，而不是 KeyDown，因为我需要替换编辑单元格的值

DataGridViewTextBoxEditingControl tb { get; set; }

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    tb = (DataGridViewTextBoxEditingControl)e.Control;
    CellEditingTB.KeyUp += Tb_KeyUp;
}

private void Tb_KeyUp(object sender, KeyEventArgs e)
{
    if (tb != null)
    {
        if (e.KeyCode == Keys.Decimal)
        {
            ..
        }
    }
}