c#: DataGridView单元格添加下拉列表（combobox)

末蓝、 2022-10-08 05:49 915阅读 0赞

# 介绍 #

在DataGridView单元格中显示下拉列表

## 方式一 ##

直接选择添加一列类型为DataGridViewComboBoxColumn的列，然后添加数据源即可。但是这种方式的下拉列表看起来并不是十分的美观。

## 方式二 ##

另用下拉列表覆盖当前单元格。

1.  另外新建ComboBox，并设置下拉选项。
2.  添加如下三个函数，代码如下

private void dataGridView1_CurrentCellChanged(object sender, EventArgs e)
            {
                DataGridViewColumn column = dataGridView1.CurrentCell.OwningColumn;
                //如果是要显示下拉列表的列的话
                if (column.Name.Equals("Column3"))
                {
                    int columnIndex = dataGridView1.CurrentCell.ColumnIndex;
                    int rowIndex = dataGridView1.CurrentCell.RowIndex;
                    Point p = this.dataGridView1.Location;
                    Rectangle rect = dataGridView1.GetCellDisplayRectangle(columnIndex, rowIndex, false);
                    comboBox1.Left = rect.Left + p.X;
                    comboBox1.Top = rect.Top + p.Y;
                    comboBox1.Width = rect.Width;
                    comboBox1.Height = rect.Height;
                    //将单元格的内容显示为下拉列表的当前项
                    string consultingRoom = dataGridView1.Rows[rowIndex].Cells[columnIndex].Value.ToString();
                    int index = comboBox1.Items.IndexOf(consultingRoom);
    
                    comboBox1.SelectedIndex = index;
                    comboBox1.Visible = true;
                }
                else
                {
                    comboBox1.Visible = false;
                }
            }
    
            private void comboBox1_DrawItem(object sender, DrawItemEventArgs e)
            {
                e.DrawBackground();
                e.Graphics.DrawString(comboBox1.Items[e.Index].ToString(), e.Font, Brushes.Black, e.Bounds, StringFormat.GenericDefault);
            }
    
            private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
            {
                if (dataGridView1.CurrentCell != null)
                    dataGridView1.CurrentCell.Value = comboBox1.Items[comboBox1.SelectedIndex];
            }

## 参考 ##

1.  [https://www.cnblogs.com/mayanlong/archive/2011/03/07/1974775.html][https_www.cnblogs.com_mayanlong_archive_2011_03_07_1974775.html]

[https_www.cnblogs.com_mayanlong_archive_2011_03_07_1974775.html]: https://www.cnblogs.com/mayanlong/archive/2011/03/07/1974775.html