Question

DataGridViewComboBoxColumn中的单元格具有ComboBoxStyle DropDownList。这意味着用户只能从下拉列表中选择值。底层控件是ComboBox，因此它可以具有DropDown样式。如何在DataGridViewComboBoxColumn中更改基础组合框的样式。或者，更一般地，我可以在DataGridView中使用下拉列表，用户可以在其中键入？

Answer 1

void dataGridView1_EditingControlShowing(object sender, 
    DataGridViewEditingControlShowingEventArgs e)
{
    if (e.Control.GetType() == typeof(DataGridViewComboBoxEditingControl))
    {
        DataGridViewComboBoxEditingControl cbo = 
            e.Control as DataGridViewComboBoxEditingControl;
        cbo.DropDownStyle = ComboBoxStyle.DropDown;
    }
}

Problem with combobox and databound datagridview

Answer 2

以下解决方案适合我

private void dataGridView1_CellValidating(object sender, 
    DataGridViewCellValidatingEventArgs e) 
{
    if (e.ColumnIndex == Column1.Index) 
    {
        // Add the value to column's Items to pass validation
        if (!Column1.Items.Contains(e.FormattedValue.ToString())) 
        {
            Column1.Items.Add(e.FormattedValue);
            dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = 
                e.FormattedValue;
        }
    }
}

private void dataGridView1_EditingControlShowing(object sender, 
    DataGridViewEditingControlShowingEventArgs e) 
{
    if (dataGridView1.CurrentCell.ColumnIndex == Column1.Index) 
    {
        ComboBox cb = (ComboBox)e.Control;
        if (cb != null) 
        {
            cb.Items.Clear();
            // Customize content of the dropdown list
            cb.Items.AddRange(appropriateCollectionOfStrings);
            cb.DropDownStyle = ComboBoxStyle.DropDown;
        }
    }
}

Answer 3

if (!Column1.Items.Contains(e.FormattedValue.ToString())) { 
    Column1.Items.Add(e.FormattedValue);     
    dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = e.FormattedValue; 
}

可能总是返回true，因为 Column1.Items.Contains() 正在搜索String值。如果e.FormattedValue不是String，则比较将失败。

试

if (!Column1.Items.Contains(e.FormattedValue.ToString())) { 
    Column1.Items.Add(e.FormattedValue.ToString());     
    dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = e.FormattedValue.ToString(); 
}

或

if (!Column1.Items.Contains(e.FormattedValue)) { 
    Column1.Items.Add(e.FormattedValue); 
    dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = e.FormattedValue; 
}

如何在DataGridViewComboBoxColumn中更改单元格的ComboBox样式

3 个答案: