Question

在我将“EditOnEnter”设置为true后，如果我没有点击组合框的向下箭头部分，则DataGridViewComboBoxCell仍然会打开两次。

任何人都有任何线索如何解决这个问题？我有自己的DataGridView课程，所以我可以通过一些聪明的事件处理程序轻松解决这个问题。

感谢。

Answer 1

由于您已将DataGridView的{{1}}属性设置为“EditOnEnter”，因此您可以覆盖其OnEditingControlShowing方法以确保下拉列表为只要组合框获得焦点，就会显示：

EditMode

每当public class myDataGridView : DataGridView { protected override void OnEditingControlShowing(DataGridViewEditingControlShowingEventArgs e) { base.OnEditingControlShowing(e); if (e.Control is ComboBox) { SendKeys.Send("{F4}"); } } }控件中的编辑控件获得输入焦点时，上面的代码会检查它是否是一个组合框。如果是这样，它virtually "presses" F4键，导致下拉部分扩展（当任何组合框具有焦点时尝试它！）。这有点像黑客，但它就像一个魅力。

Answer 2

我使用此解决方案，因为它避免了发送击键：

重写OnCellClick方法（如果你是子类）或订阅CellClick事件（如果你正在改变另一个对象的DGV而不是子类）。

protected override void OnCellClick(DataGridViewCellEventArgs e)
{
    // Normally the user would need to click a combo box cell once to 
    // activate it and then again to drop the list down--this is annoying for 
    // our purposes so let the user activate the drop-down with a single click.
    if (e.ColumnIndex == this.Columns["YourDropDownColumnName"].Index
        && e.RowIndex >= 0
        && e.RowIndex <= this.Rows.Count)
    {
        this.CurrentCell = this[e.ColumnIndex, e.RowIndex];
        this.BeginEdit(false);
        ComboBox comboBox = this.EditingControl as ComboBox;
        if (comboBox != null)
        {
            comboBox.DroppedDown = true;
        }
    }

    base.OnCellContentClick(e);
}

Answer 3

    protected override void OnEditingControlShowing(DataGridViewEditingControlShowingEventArgs e)
    {
        base.OnEditingControlShowing(e);
        DataGridViewComboBoxEditingControl dataGridViewComboBoxEditingControl = e.Control as DataGridViewComboBoxEditingControl;
        if (dataGridViewComboBoxEditingControl != null)
        {
            dataGridViewComboBoxEditingControl.GotFocus += this.DataGridViewComboBoxEditingControl_GotFocus;
            dataGridViewComboBoxEditingControl.Disposed += this.DataGridViewComboBoxEditingControl_Disposed;
        }
    }

    private void DataGridViewComboBoxEditingControl_GotFocus(object sender, EventArgs e)
    {
        ComboBox comboBox = sender as ComboBox;
        if (comboBox != null)
        {
            if (!comboBox.DroppedDown)
            {
                comboBox.DroppedDown = true;
            }
        }
    }

    private void DataGridViewComboBoxEditingControl_Disposed(object sender, EventArgs e)
    {
        Control control = sender as Control;
        if (control != null)
        {
            control.GotFocus -= this.DataGridViewComboBoxEditingControl_GotFocus;
            control.Disposed -= this.DataGridViewComboBoxEditingControl_Disposed;
        }
    }

Answer 4

请参阅：VB.NET Controls inside of a DataGridView Row on a Windows Form

Answer 5

要避免SendKeys问题，请尝试Open dropdown(in a datagrid view) items on a single click中的解决方案。实质上，在OnEditingControlShowing挂钩到组合框的Enter事件时，在Enter事件处理程序中，设置ComboBox.DroppedDown = true。这似乎有同样的效果，但没有@Cody Gray提到的副作用。

如何让DataGridView组合框一键显示下拉列表？

5 个答案: