在 DataGridView控件中加入ComboBox下拉列表框的实现

虽然在Visual Studio中 DataGridView控件的DataGridViewComboBoxColumn可以实现下拉列表框，但这样的列会在整列中都显示下拉列表框，不太美观，而且还要用代码实现数据绑定。本文介绍一种只在当前编辑单元格中显示下拉列表框的方法，供大家参考。

　　首先新建一个Windows应用程序，将主窗体重命名为MainForm，在MainForm中加入一个DataGridView控件，命名为 dgv_User。如下图所示：

　　打开窗体代码窗口，在代码窗口中声明一个ComboBox的控件

// 定义下拉列表框
在 DataGridView控件中加入ComboBox下拉列表框的实现

private ComboBox cmb_Temp = new ComboBox();

　　我们要绑定的下拉列表框的功能是选择性别，添加如下绑定性别下拉列表框的方法

/// <summary>
/// 绑定性别下拉列表框
/// </summary>
private void BindSex()
{
    DataTable dtSex = new DataTable();
    dtSex.Columns.Add( " Value " );
    dtSex.Columns.Add( " Name " );
    DataRow drSex;
    drSex = dtSex.NewRow();
    drSex[ 0 ] = " 1 " ;
    drSex[ 1 ] = " 男 " ;
    dtSex.Rows.Add(drSex);
    drSex = dtSex.NewRow();
    drSex[ 0 ] = " 0 " ;
    drSex[ 1 ] = " 女 " ;
    dtSex.Rows.Add(drSex);
    cmb_Temp.ValueMember = " Value " ;
    cmb_Temp.DisplayMember = " Name " ;
    cmb_Temp.DataSource = dtSex;
    cmb_Temp.DropDownStyle = ComboBoxStyle.DropDownList;
}

　　通常情况下我们都是从数据库中获取数据表（或者数据集），然后绑定到DataGridView中的，这里我们为了避免连接数据库，手中构造一个数据库表，代码如下：

private void BindData()
{
    DataTable dtData = new DataTable();
    dtData.Columns.Add( " ID " );
    dtData.Columns.Add( " Name " );
    dtData.Columns.Add( " Sex " );
    DataRow drData;
    drData = dtData.NewRow();
    drData[ 0 ] = 1 ;
    drData[ 1 ] = " 张三 " ;
    drData[ 2 ] = " 1 " ;
    dtData.Rows.Add(drData);
    drData = dtData.NewRow();
    drData[ 0 ] = 2 ;
    drData[ 1 ] = " 李四 " ;
    drData[ 2 ] = " 1 " ;
    dtData.Rows.Add(drData);
    drData = dtData.NewRow();
    drData[ 0 ] = 3 ;
    drData[ 1 ] = " 王五 " ;
    drData[ 2 ] = " 1 " ;
    dtData.Rows.Add(drData);
    drData = dtData.NewRow();
    drData[ 0 ] = 4 ;
    drData[ 1 ] = " 小芳 " ;
    drData[ 2 ] = " 0 " ;
    dtData.Rows.Add(drData);
    drData = dtData.NewRow();
    drData[ 0 ] = 5 ;
    drData[ 1 ] = " 小娟 " ;
    drData[ 2 ] = " 0 " ;
    dtData.Rows.Add(drData);
    drData = dtData.NewRow();
    drData[ 0 ] = 6 ;
    drData[ 1 ] = " 赵六 " ;
    drData[ 2 ] = " 1 " ;
    dtData.Rows.Add(drData);
     this .dgv_User.DataSource = dtData;
}

　　为窗体加载事件添加如下方法，其具体功能有详细说明：

private void MainForm_Load( object sender, EventArgs e)
{
     // 绑定性别下拉列表框
    BindSex();

     // 绑定数据表
    BindData();

     // 设置下拉列表框不可见
    cmb_Temp.Visible = false ;

     // 添加下拉列表框事件
    cmb_Temp.SelectedIndexChanged += new EventHandler(cmb_Temp_SelectedIndexChanged);

     // 将下拉列表框加入到DataGridView控件中
     this .dgv_User.Controls.Add(cmb_Temp);
}

　　当用户选择的单元格移动到性别这一列时，我们要显示下拉列表框，添加如下事件

private void dgv_User_CurrentCellChanged( object sender, EventArgs e)
{
     try
    {
         if ( this .dgv_User.CurrentCell.ColumnIndex == 2 )
        {
            Rectangle rect = dgv_User.GetCellDisplayRectangle(dgv_User.CurrentCell.ColumnIndex, dgv_User.CurrentCell.RowIndex, false );
             string sexValue = dgv_User.CurrentCell.Value.ToString();
             if (sexValue == " 1 " )
            {
                cmb_Temp.Text = " 男 " ;
            }
             else
            {
                cmb_Temp.Text = " 女 " ;
            }
            cmb_Temp.Left = rect.Left;
            cmb_Temp.Top = rect.Top;
            cmb_Temp.Width = rect.Width;
            cmb_Temp.Height = rect.Height;
            cmb_Temp.Visible = true ;
        }
         else
        {
            cmb_Temp.Visible = false ;
        }
    }
     catch
    {
    }
}

　　当用户选择下拉列表框时改变DataGridView单元格的内容

private void cmb_Temp_SelectedIndexChanged( object sender, EventArgs e)
{
     if (((ComboBox)sender).Text == " 男 " )
    {
        dgv_User.CurrentCell.Value = " 男 " ;
        dgv_User.CurrentCell.Tag = " 1 " ;
    }
     else
    {
        dgv_User.CurrentCell.Value = " 女 " ;
        dgv_User.CurrentCell.Tag = " 0 " ;
    }
}

　　当滚动DataGridView或者改变DataGridView列宽时将下拉列表框设为不可见

private void dgv_User_Scroll( object sender, ScrollEventArgs e)
{
this .cmb_Temp.Visible = false ;
}

private void dgv_User_ColumnWidthChanged( object sender, DataGridViewColumnEventArgs e)
{
this .cmb_Temp.Visible = false ;
}

　　绑定数据表后将性别列中的每一单元格的Value和Tag属性（Tag为值文本，Value为显示文本）

private void dgv_User_DataBindingComplete( object sender, DataGridViewBindingCompleteEventArgs e)
{
     for ( int i = 0 ; i < this .dgv_User.Rows.Count; i ++ )
    {
         if (dgv_User.Rows[i].Cells[ 2 ].Value != null && dgv_User.Rows[i].Cells[ 2 ].ColumnIndex == 2 )
        {
            dgv_User.Rows[i].Cells[ 2 ].Tag = dgv_User.Rows[i].Cells[ 2 ].Value.ToString();
             if (dgv_User.Rows[i].Cells[ 2 ].Value.ToString() == " 1 " )
            {
                dgv_User.Rows[i].Cells[ 2 ].Value = " 男 " ;
            }
             else if (dgv_User.Rows[i].Cells[ 2 ].Value.ToString() == " 0 " )
            {
                dgv_User.Rows[i].Cells[ 2 ].Value = " 女 " ;
            }
        }
    }
}

　　效果如下图所示：

在 DataGridView控件中加入ComboBox下拉列表框的实现

　　完整的代码如下：

using System;
using System.Data;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace MyNameSpace
{
     public partial class MainForm : Form
    {
         // 定义下拉列表框
         private ComboBox cmb_Temp = new ComboBox();

         public MainForm()
        {
            InitializeComponent();
        }

         /// <summary>
         /// 绑定性别下拉列表框
         /// </summary>
         private void BindSex()
        {
            DataTable dtSex = new DataTable();
            dtSex.Columns.Add( " Value " );
            dtSex.Columns.Add( " Name " );
            DataRow drSex;
            drSex = dtSex.NewRow();
            drSex[ 0 ] = " 1 " ;
            drSex[ 1 ] = " 男 " ;
            dtSex.Rows.Add(drSex);
            drSex = dtSex.NewRow();
            drSex[ 0 ] = " 0 " ;
            drSex[ 1 ] = " 女 " ;
            dtSex.Rows.Add(drSex);
            cmb_Temp.ValueMember = " Value " ;
            cmb_Temp.DisplayMember = " Name " ;
            cmb_Temp.DataSource = dtSex;
            cmb_Temp.DropDownStyle = ComboBoxStyle.DropDownList;
        }

         /// <summary>
         /// 为避免连接数据库，这里手工构造数据表，实际应用中应从数据库中获取
         /// </summary>
         private void BindData()
        {
            DataTable dtData = new DataTable();
            dtData.Columns.Add( " ID " );
            dtData.Columns.Add( " Name " );
            dtData.Columns.Add( " Sex " );
            DataRow drData;
            drData = dtData.NewRow();
            drData[ 0 ] = 1 ;
            drData[ 1 ] = " 张三 " ;
            drData[ 2 ] = " 1 " ;
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[ 0 ] = 2 ;
            drData[ 1 ] = " 李四 " ;
            drData[ 2 ] = " 1 " ;
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[ 0 ] = 3 ;
            drData[ 1 ] = " 王五 " ;
            drData[ 2 ] = " 1 " ;
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[ 0 ] = 4 ;
            drData[ 1 ] = " 小芳 " ;
            drData[ 2 ] = " 0 " ;
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[ 0 ] = 5 ;
            drData[ 1 ] = " 小娟 " ;
            drData[ 2 ] = " 0 " ;
            dtData.Rows.Add(drData);
            drData = dtData.NewRow();
            drData[ 0 ] = 6 ;
            drData[ 1 ] = " 赵六 " ;
            drData[ 2 ] = " 1 " ;
            dtData.Rows.Add(drData);
             this .dgv_User.DataSource = dtData;
        }

         private void MainForm_Load( object sender, EventArgs e)
        {
             // 绑定性别下拉列表框
            BindSex();

             // 绑定数据表
            BindData();

             // 设置下拉列表框不可见
            cmb_Temp.Visible = false ;

             // 添加下拉列表框事件
            cmb_Temp.SelectedIndexChanged += new EventHandler(cmb_Temp_SelectedIndexChanged);

             // 将下拉列表框加入到DataGridView控件中
             this .dgv_User.Controls.Add(cmb_Temp);
        }

         // 当用户移动到性别这一列时单元格显示下拉列表框
         private void dgv_User_CurrentCellChanged( object sender, EventArgs e)
        {
             try
            {
                 if ( this .dgv_User.CurrentCell.ColumnIndex == 2 )
                {
                    Rectangle rect = dgv_User.GetCellDisplayRectangle(dgv_User.CurrentCell.ColumnIndex, dgv_User.CurrentCell.RowIndex, false );
                     string sexValue = dgv_User.CurrentCell.Value.ToString();
                     if (sexValue == " 1 " )
                    {
                        cmb_Temp.Text = " 男 " ;
                    }
                     else
                    {
                        cmb_Temp.Text = " 女 " ;
                    }
                    cmb_Temp.Left = rect.Left;
                    cmb_Temp.Top = rect.Top;
                    cmb_Temp.Width = rect.Width;
                    cmb_Temp.Height = rect.Height;
                    cmb_Temp.Visible = true ;
                }
                 else
                {
                    cmb_Temp.Visible = false ;
                }
            }
             catch
            {
            }
        }

         // 当用户选择下拉列表框时改变DataGridView单元格的内容
         private void cmb_Temp_SelectedIndexChanged( object sender, EventArgs e)
        {
             if (((ComboBox)sender).Text == " 男 " )
            {
                dgv_User.CurrentCell.Value = " 男 " ;
                dgv_User.CurrentCell.Tag = " 1 " ;
            }
             else
            {
                dgv_User.CurrentCell.Value = " 女 " ;
                dgv_User.CurrentCell.Tag = " 0 " ;
            }
        }

         // 滚动DataGridView时将下拉列表框设为不可见
         private void dgv_User_Scroll( object sender, ScrollEventArgs e)
        {
             this .cmb_Temp.Visible = false ;
        }

         // 改变DataGridView列宽时将下拉列表框设为不可见
         private void dgv_User_ColumnWidthChanged( object sender, DataGridViewColumnEventArgs e)
        {
             this .cmb_Temp.Visible = false ;
        }

         // 绑定数据表后将性别列中的每一单元格的Value和Tag属性（Tag为值文本，Value为显示文本）
         private void dgv_User_DataBindingComplete( object sender, DataGridViewBindingCompleteEventArgs e)
        {
             for ( int i = 0 ; i < this .dgv_User.Rows.Count; i ++ )
            {
                 if (dgv_User.Rows[i].Cells[ 2 ].Value != null && dgv_User.Rows[i].Cells[ 2 ].ColumnIndex == 2 )
                {
                    dgv_User.Rows[i].Cells[ 2 ].Tag = dgv_User.Rows[i].Cells[ 2 ].Value.ToString();
                     if (dgv_User.Rows[i].Cells[ 2 ].Value.ToString() == " 1 " )
                    {
                        dgv_User.Rows[i].Cells[ 2 ].Value = " 男 " ;
                    }
                     else if (dgv_User.Rows[i].Cells[ 2 ].Value.ToString() == " 0 " )
                    {
                        dgv_User.Rows[i].Cells[ 2 ].Value = " 女 " ;
                    }
                }
            }
        }
    }
}

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在 DataGridView控件中加入ComboBox下拉列表框的实现

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