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
privateComboBoxcmb_Temp=newComboBox();
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>
privatevoidBindSex()
{
DataTabledtSex=newDataTable();
dtSex.Columns.Add("Value");
dtSex.Columns.Add("Name");
DataRowdrSex;
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:
privatevoidBindData()
{
DataTabledtData=newDataTable();
dtData.Columns.Add("ID");
dtData.Columns.Add("Name");
dtData.Columns.Add("Sex");
DataRowdrData;
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:
privatevoidMainForm_Load(objectsender,EventArgse)
{
//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+=newEventHandler(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
privatevoiddgv_User_CurrentCellChanged(objectsender,EventArgse)
{
try
{
if(this.dgv_User.CurrentCell.ColumnIndex==
2)
{
Rectanglerect=dgv_User.GetCellDisplayRectangle(dgv_User.CurrentCell.ColumnIndex,dgv_User.CurrentCell.RowIndex,false);
stringsexValue=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
privatevoidcmb_Temp_SelectedIndexChanged(objectsender,EventArgse)
{
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
privatevoiddgv_User_Scroll(objectsender,ScrollEventArgse)
{
this.cmb_Temp.Visible=false;
}
privatevoiddgv_User_ColumnWidthChanged(objectsender,DataGridViewColumnEventArgse)
{
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)
privatevoiddgv_User_DataBindingComplete(objectsender,DataGridViewBindingCompleteEventArgse)
{
for(inti=
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:
完整的代码如下:
usingSystem;
usingSystem.Data;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Drawing;
usingSystem.Text;
usingSystem.Windows.Forms;
namespaceMyNameSpace
{
publicpartialclassMainForm:Form
{
//定义下拉列表框
privateComboBoxcmb_Temp=newComboBox();
publicMainForm()
{
InitializeComponent();
}
///<summary>
///绑定性别下拉列表框
///</summary>
privatevoidBindSex()
{
DataTabledtSex=newDataTable();
dtSex.Columns.Add("Value");
dtSex.Columns.Add("Name");
DataRowdrSex;
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>
privatevoidBindData()
{
DataTabledtData=newDataTable();
dtData.Columns.Add("ID");
dtData.Columns.Add("Name");
dtData.Columns.Add("Sex");
DataRowdrData;
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;
}
privatevoidMainForm_Load(objectsender,EventArgse)
{
//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+=newEventHandler(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
privatevoiddgv_User_CurrentCellChanged(objectsender,EventArgse)
{
try
{
if(this.dgv_User.CurrentCell.ColumnIndex==
2)
{
Rectanglerect=dgv_User.GetCellDisplayRectangle(dgv_User.CurrentCell.ColumnIndex,dgv_User.CurrentCell.RowIndex,false);
stringsexValue=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
privatevoidcmb_Temp_SelectedIndexChanged(objectsender,EventArgse)
{
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
privatevoiddgv_User_Scroll(objectsender,ScrollEventArgse)
{
this.cmb_Temp.Visible=false;
}
//改变DataGridView列宽时将下拉列表框设为不可见
privatevoiddgv_User_ColumnWidthChanged(objectsender,DataGridViewColumnEventArgse)
{
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)
privatevoiddgv_User_DataBindingComplete(objectsender,DataGridViewBindingCompleteEventArgse)
{
for(inti=
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";
}
}
}
}
}
}
转载自:http://www.cnblogs.com/luqingfei/archive/2007/03/28/691372.html