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net下有一个类datagridcolumn
作为 datagrid 控件的不同列类型的基类。
有关此类型所有成员的列表，请参阅 datagridcolumn 成员。
system.object
system.web.ui.webcontrols.datagridcolumn
system.web.ui.webcontrols.boundcolumn
system.web.ui.webcontrols.buttoncolumn
system.web.ui.webcontrols.editcommandcolumn
system.web.ui.webcontrols.hyperlinkcolumn
system.web.ui.webcontrols.templatecolumn
我们完成可以写一个继承datagirdcolumn的类，这样就成了。dropdownlistcolumn,checkboxlistcolumn等。
控件的代码如下。
using system;
using system.web.ui;
using system.web.ui.webcontrols ;
using system.collections ;
using system.data ;
namespace customcolumn
{
/// <summary>
/// datagridcustomcolumn 的摘要说明。
/// </summary>
public class dropdownlistcolumn :system.web.ui.webcontrols.datagridcolumn
{
//数据源
public datatable datasource ;
//显示的文本字段
public string datatextfield ;
//
public string datavaluefield ;
//datagrid中要绑定的字段
public string datafield ;
public string datashowfield;
public dropdownlistcolumn()
{
//
// todo: 在此处添加构造函数逻辑
//
}
public override void initializecell(tablecell cell, int columnindex, listitemtype itemtype)
{
base.initializecell (cell, columnindex, itemtype);
switch(itemtype)
{
case listitemtype.header :
cell.text = this.headertext ;
break;
case listitemtype.item:case listitemtype.alternatingitem :
cell.databinding +=new eventhandler(cell_itemdatabinding);
break;
case listitemtype.edititem :
cell.databinding +=new eventhandler(cell_edititemdatabinding);
//========================
dropdownlist drp = new dropdownlist();
cell.controls.add(drp);
break;
}
}
private void cell_itemdatabinding(object sender, eventargs e)
{
tablecell cell =(tablecell)sender ;
datagriditem dgi =(datagriditem)cell.namingcontainer ;
try
{
cell.text = (databinder.eval(dgi.dataitem,datashowfield)).tostring();
}
catch
{
throw new exception("请设置字段");
}
}
private void cell_edititemdatabinding(object sender,eventargs e)
{
tablecell cell =(tablecell)sender ;
dropdownlist drp =(dropdownlist)cell.controls[0]; ;
listitem item ;
datagriditem dgi ;
try
{
//================
drp.items.add(new listitem("请选择","-1"));
//
for(int k=0;k<=datasource.rows.count -1;k++)
{
datarow dr = datasource.rows[k];
item = new listitem();
item.text = dr[datatextfield].tostring();
item.value = dr[datavaluefield].tostring();
drp.items.add(item);
}
dgi =(datagriditem)cell.namingcontainer ;
string value = databinder.eval(dgi.dataitem,datafield).tostring();
item = drp.items.findbyvalue(value);
if(item!=null)
{
item.selected = true;
}
}
catch
{
throw new exception("数据源不对。");
}
}
}
}
aspx页面调用。
先注册:
<%@ register tagprefix="drpcolumn" namespace="customcolumn" assembly="dropdownlistcolumn" %>
调用
<asp:datagrid id="dgteacher" runat="server" width="100%" autogeneratecolumns="false" allowpaging="true"
cssclass="datagrid" bordercolor="#333333" borderstyle="solid">
<columns>
<drpcolumn:dropdownlistcolumn headertext="导师"></drpcolumn:dropdownlistcolumn>
<asp:boundcolumn datafield="specname2" readonly="true" headertext="主修专业"></asp:boundcolumn>
<drpcolumn:dropdownlistcolumn datashowfield="specname" datafield="specguid" headertext="兼岗专业"></drpcolumn:dropdownlistcolumn>
<asp:boundcolumn datafield="createddt" readonly="true" headertext="创建日期" dataformatstring="{0:d}"></asp:boundcolumn>
<asp:boundcolumn datafield="createdby" readonly="true" headertext="创建者"></asp:boundcolumn>
<asp:boundcolumn datafield="srcip" readonly="true" headertext="来源ip"></asp:boundcolumn>
<asp:boundcolumn datafield="updatedby" readonly="true" headertext="修改者"></asp:boundcolumn>
<asp:editcommandcolumn buttontype="linkbutton" updatetext="更新" headertext="操作" canceltext="取消" edittext="编辑"></asp:editcommandcolumn>
<asp:buttoncolumn text="<span onclick=return confirmdel();>删除</span>" headertext="操作"
commandname="delete"></asp:buttoncolumn>
</columns>
<pagerstyle mode="numericpages"></pagerstyle>
</asp:datagrid>
