在DataGridView控件中加入ComboBox下拉列表框的实现

简介: 本文转载:http://www.cnblogs.com/luqingfei/archive/2007/03/28/691372.html 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。

本文转载:http://www.cnblogs.com/luqingfei/archive/2007/03/28/691372.html

 

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
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 ] = " " ;
    dtSex.Rows.Add(drSex);
    drSex
= dtSex.NewRow();
    drSex[
0 ] = " 0 " ;
    drSex[
1 ] = " " ;
    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
= " " ;
            }
           
else
            {
                cmb_Temp.Text
= " " ;
            }
            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 == " " )
    {
        dgv_User.CurrentCell.Value
= " " ;
        dgv_User.CurrentCell.Tag
= " 1 " ;
    }
   
else
    {
        dgv_User.CurrentCell.Value
= " " ;
        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 = " " ;
            }
           
else if (dgv_User.Rows[i].Cells[ 2 ].Value.ToString() == " 0 " )
            {
                dgv_User.Rows[i].Cells[
2 ].Value = " " ;
            }
        }
    }
}

  效果如下图所示:



  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 ] = " " ;
            dtSex.Rows.Add(drSex);
            drSex
= dtSex.NewRow();
            drSex[
0 ] = " 0 " ;
            drSex[
1 ] = " " ;
            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
= " " ;
                    }
                   
else
                    {
                        cmb_Temp.Text
= " " ;
                    }
                    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 == " " )
            {
                dgv_User.CurrentCell.Value
= " " ;
                dgv_User.CurrentCell.Tag
= " 1 " ;
            }
           
else
            {
                dgv_User.CurrentCell.Value
= " " ;
                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 = " " ;
                    }
                   
else if (dgv_User.Rows[i].Cells[ 2 ].Value.ToString() == " 0 " )
                    {
                        dgv_User.Rows[i].Cells[
2 ].Value = " " ;
                    }
                }
            }
        }
    }
}
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