IDC资讯中心
在datagrid中简单使用下拉列表框
作者：tushar ameta
翻译：秋枫
在datagrid中使用下拉列表问题。这篇文章讲了如何在 system.windows.forms.datagrid中切入使用combobox控件。不过原文不全，无法调试，在这里为了说清楚点，对原文作了一些修改，整篇文章主要包括三方面的内容。
1． 在datagrid中加入combobox列；
2． 把在datagrid中的修改保存到对应的网格；
3． 设置datagrid中网格的焦点。
下面是整个源代码，一些功能可以看注释。
using system;
using system.drawing;
using system.collections;
using system.componentmodel;
using system.windows.forms;
using system.data;
namespace datagridtest
{
public class form1 : system.windows.forms.form
{
private system.windows.forms.datagrid dgdfunctionarea;
private datatable dtblfunctionalarea;
private system.windows.forms.button buttonfocus;
private system.componentmodel.container components = null;
public form1()
{
initializecomponent();
populategrid();
}
protected override void dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.dispose();
}
}
base.dispose( disposing );
}
#region windows 窗体设计器生成的代码
private void initializecomponent()
{
this.dgdfunctionarea = new system.windows.forms.datagrid();
this.buttonfocus = new system.windows.forms.button();
((system.componentmodel.isupportinitialize)(this.dgdfunctionarea)).begininit();
this.suspendlayout();
//
// dgdfunctionarea
//
this.dgdfunctionarea.datamember = "";
this.dgdfunctionarea.headerforecolor = system.drawing.systemcolors.controltext;
this.dgdfunctionarea.location = new system.drawing.point(4, 8);
this.dgdfunctionarea.name = "dgdfunctionarea";
this.dgdfunctionarea.size = new system.drawing.size(316, 168);
this.dgdfunctionarea.tabindex = 0;
//
// buttonfocus
//
this.buttonfocus.location = new system.drawing.point(232, 188);
this.buttonfocus.name = "buttonfocus";
this.buttonfocus.size = new system.drawing.size(84, 23);
this.buttonfocus.tabindex = 1;
this.buttonfocus.text = "获取焦点";
this.buttonfocus.click += new system.eventhandler(this.buttonfocus_click);
//
// form1
//
this.autoscalebasesize = new system.drawing.size(6, 14);
this.clientsize = new system.drawing.size(332, 217);
this.controls.add(this.buttonfocus);
this.controls.add(this.dgdfunctionarea);
this.name = "form1";
this.text = "form1";
((system.componentmodel.isupportinitialize)(this.dgdfunctionarea)).endinit();
this.resumelayout(false);
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[stathread]
static void main()
{
application.run(new form1());
}
//初始化datagrid
private void populategrid()
{
//创建一个datatable对象，包括四列，前三列为string，最后一列为boolean。
dtblfunctionalarea = new datatable ("functionarea");
string[] arrstrfunctionalarea = new string [3]{"functional area","min","max"};
datacolumn dtcol = null;
//创建string列
for(int i=0; i< 3;i++)
{
dtcol = new datacolumn(arrstrfunctionalarea[i]);
dtcol.datatype = type.gettype("system.string");
dtcol.defaultvalue = "";
dtblfunctionalarea.columns.add(dtcol);
}
//创建boolean列，用checkedbox来显示。
datacolumn dtccheck = new datacolumn("ismandatory");
dtccheck.datatype = system.type.gettype("system.boolean");
dtccheck.defaultvalue = false;
dtblfunctionalarea.columns.add(dtccheck);
//把表绑定到datagrid
dgdfunctionarea.datasource = dtblfunctionalarea;
//为datagrid加载datagridtablestyle样式
if(!dgdfunctionarea.tablestyles.contains("functionarea"))
{
datagridtablestyle dgdtblstyle = new datagridtablestyle();
dgdtblstyle.mappingname = dtblfunctionalarea.tablename;
dgdfunctionarea.tablestyles.add(dgdtblstyle);
dgdtblstyle.rowheadersvisible = false;
dgdtblstyle.headerbackcolor = color.lightsteelblue;
dgdtblstyle.allowsorting = false;
dgdtblstyle.headerbackcolor = color.fromargb(8,36,107);
dgdtblstyle.rowheadersvisible = false;
dgdtblstyle.headerforecolor = color.white;
dgdtblstyle.headerfont = new system.drawing.font("microsoft sans serif", 9f,
system.drawing.fontstyle.bold,
system.drawing.graphicsunit.point, ((system.byte)(0)));
dgdtblstyle.gridlinecolor = color.darkgray;
dgdtblstyle.preferredrowheight = 22;
dgdfunctionarea.backgroundcolor = color.white;
//设置列的宽度
gridcolumnstylescollection colstyle = dgdfunctionarea.tablestyles[0].gridcolumnstyles;
colstyle[0].width = 100;
colstyle[1].width = 50;
colstyle[2].width = 50;
colstyle[3].width = 80;
}
datagridtextboxcolumn dgtb = (datagridtextboxcolumn)dgdfunctionarea.tablestyles[0].gridcolumnstyles[0];
combobox cmbfunctionarea = new combobox();
cmbfunctionarea.items.addrange(new object[]{"选项一","选项二","选项三"});
cmbfunctionarea.cursor = cursors.arrow;
cmbfunctionarea.dropdownstyle= comboboxstyle.dropdownlist;
cmbfunctionarea.dock = dockstyle.fill;
//在选定项发生更改并且提交了该更改后发生
cmbfunctionarea.selectionchangecommitted += new eventhandler(cmbfunctionarea_selectionchangecommitted);
//把combobox添加到datagridtablestyle的第一列
dgtb.textbox.controls.add(cmbfunctionarea);
}
//设置焦点模拟
private void getfocus(int row,int col)
{
//先把焦点移动到datagrid
this.dgdfunctionarea.focus();
//把焦点移动到datagridcell
datagridcell dgc = new datagridcell(row,col);
this.dgdfunctionarea.currentcell = dgc;
datagridtextboxcolumn dgtb = (datagridtextboxcolumn)dgdfunctionarea.tablestyles[0].gridcolumnstyles[col];
//设置焦点
dgtb.textbox.focus();
}
//把combobox上修改的数据提交到当前的网格
private void cmbfunctionarea_selectionchangecommitted(object sender, eventargs e)
{
this.dgdfunctionarea[this.dgdfunctionarea.currentcell] = ((combobox)sender).selecteditem.tostring();
}
//设置新的焦点
private void buttonfocus_click(object sender, system.eventargs e)
{
//焦点模拟,这里设置第三行第一列
getfocus(2,0);
}
}
}
下面是测试界面：
总结，这里是通过datagridtextboxcolumn.textbox.controls.add方法实现在列中添加combobox控件；对于数据的保存是使用combobox.selectionchangecommitted事件来完成；设置焦点是通过datagridtextboxcolumn.textbox.focus方法来实现。另外通过这个方法也可以添加datetimepicker等类似的控件。
