ASP.NET2.0中动态添加GridView模板列

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动态添加列，关键是实现ITemplate.InstantiateIn方法。下面是一个添加GridView 模板列的例子。

C#代码

<%...@PageLanguage="C#"%>
<%...@ImportNamespace="System.Data"%>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<scriptrunat="server">...
ICollectionCreateDataSource()
...{
   DataTabledt=newDataTable();
   DataRowdr;
   dt.Columns.Add(newDataColumn("id",typeof(Int32)));
   dt.Columns.Add(newDataColumn("text",typeof(string)));
   for(inti=0;i<6;i++)
   ...{
     dr=dt.NewRow();
     dr[0]=i;
     dr[1]="列表项目"+i.ToString();
     dt.Rows.Add(dr);
   }
   DataViewdv=newDataView(dt);
   returndv;
}

publicclassGridViewTemplate:ITemplate
...{
privateDataControlRowTypetemplateType;
privatestringcolumnName;

   publicGridViewTemplate(DataControlRowTypetype,stringcolname)
   ...{
     templateType=type;
     columnName=colname;
   }

   publicvoidInstantiateIn(System.Web.UI.Controlcontainer)
   ...{
     switch(templateType)
     ...{
       caseDataControlRowType.Header:
         Literallc=newLiteral();
         lc.Text=columnName;
         container.Controls.Add(lc);
         break;
       caseDataControlRowType.DataRow:
         DropDownListdrr=newDropDownList();
         drr.ID="dropdown";

         drr.AppendDataBoundItems=true;
         drr.Items.Add(newListItem("-----请选择------",""));
         drr.Items.Add(newListItem("AA","a"));
         drr.Items.Add(newListItem("BB","b"));
         drr.Items.Add(newListItem("CC","c"));
         container.Controls.Add(drr);
         break;
       default:
        break;
     }
   }
}

protectedvoidPage_Load(objectsender,EventArgse)
...{
   if(!IsPostBack)
   ...{
     TemplateFieldcustomField=newTemplateField();
     customField.ShowHeader=true;
     customField.HeaderTemplate=newGridViewTemplate(DataControlRowType.Header,"动态添加列");
     customField.ItemTemplate=newGridViewTemplate(DataControlRowType.DataRow,"");
     GridView1.Columns.Add(customField);
     GridView1.DataSource=CreateDataSource();
     GridView1.DataBind();
   }
}

protectedvoidGridView1_RowDataBound(objectsender,GridViewRowEventArgse)
...{
   if(e.Row.RowType==DataControlRowType.DataRow)
   ...{
     //可以在这里访问数据库的其它字段的值，可以设置默认选择项，具体应用，看自己的发挥了。
     //下面只是例子，举一反三，不再费话了
     DataRowViewgv=(DataRowView)e.Row.DataItem;
     intitemSeleted=Int32.Parse(gv.Row["id"].ToString())>3?0:Int32.Parse(gv.Row["id"].ToString());
     DropDownListdr=(DropDownList)e.Row.FindControl("dropdown");
     dr.SelectedIndex=itemSeleted;
   }
}
</script>

<htmlxmlns="http://www.w3.org/1999/xhtml">
<headid="Head1"runat="server">
<title>GridView动态添加模板列的例子</title>
</head>
<body>
<formid="form1"runat="server">
<ASP:GridViewID="GridView1"runat="server"AutoGenerateColumns="False"
    OnRowDataBound="GridView1_RowDataBound">
   <Columns>
     <ASP:BoundFieldHeaderText="标题" DataField="text"/>
   </Columns>
</ASP:GridView>
</form>
</body>
</html>