在DataList中嵌套DataList的使用（只是举个列子，其实好多数据绑定控件里的项都可以再嵌套数据绑定控件的）
在很多情况下,我们经常要显示几张关联表的数据, 例如：在一个在线考试系统中，我们在页面中放一个DataList，然后要显示出这张试卷来 等。 效果图如下：
代码：
页面文件代码
<%
@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DataList嵌套DataList的使用</title>
</head>
<body>
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" Text="交 卷" OnClick="Button1_Click" />
<!--父DataList开始-->
<asp:DataList ID="ExamTest" runat="server">
<ItemTemplate>
<%#DataBinder.Eval(Container.DataItem, "SubName")%>
<br>
<!--子DataList开始-->
<asp:DataList runat="server" ID="SubInfo" DataSource='<%#((DataRowView)Container.DataItem).Row.GetChildRows("myrelation") %>'>
<ItemTemplate>
<%#DataBinder.Eval(Container.DataItem,"[\"Sub\"]") %>
<br>
<asp:TextBox runat="server" ID="Answer" Text='<%#DataBinder.Eval(Container.DataItem,"[\"Answer\"]") %>'></asp:TextBox>
<asp:Label ID="subID" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"[\"ID\"]") %>' Visible="false"></asp:Label>
</ItemTemplate>
</asp:DataList>
<!--子DataList结束-->
</ItemTemplate>
</asp:DataList>
<!--父DataList结束-->
</form>
</body>
</html>
后台代码：
后台代码
protected void Page_Load(object sender, EventArgs e)
{
if (!this.Page.IsPostBack)
{
GridViewBD();
}
}
protected void GridViewBD()
{
string SqlConn = ConfigurationManager.AppSettings["SqlConn"];
SqlConnection conn = new SqlConnection(SqlConn);
SqlDataAdapter dataAda = new SqlDataAdapter("select * from ExamInfo", conn);
DataSet dset = new DataSet();
conn.Open();
//读取ExamInfo表,填充父表
dataAda.Fill(dset, "ExamInfo");
SqlDataAdapter dataAda01 = new SqlDataAdapter("select * from PageInfo", conn);
//读取PageInfo表,填充子表
dataAda01.Fill(dset, "PageSub");
conn.Close();
//创建父表和子表关系
dset.Relations.Add("myrelation", dset.Tables["ExamInfo"].Columns["ID"], dset.Tables["PageSub"].Columns["PageID"]);
//绑定ExamInfo表到父DataList
ExamTest.DataSource = dset.Tables["ExamInfo"];
ExamTest.DataBind();
}
protected void Button1_Click(object sender, EventArgs e)
{
string SqlConn = ConfigurationManager.AppSettings["SqlConn"];
SqlConnection conn = new SqlConnection(SqlConn);
SqlCommand cmd = new SqlCommand("Update PageInfo Set Answer=@answer where ID=@ID", conn);
conn.Open();
foreach (DataListItem item in ExamTest.Items)
{
DataList subInfo = (DataList)item.FindControl("SubInfo");
foreach(DataListItem childItem in subInfo.Items)
{
cmd.Parameters.Clear();
string str = ((TextBox)childItem.FindControl("Answer")).Text.ToString();
int subID = Convert.ToInt32( ((Label)childItem.FindControl("subID")).Text.Trim() );
cmd.Parameters.Add("@answer",SqlDbType.VarChar,50).Value=str;
cmd.Parameters.Add("@ID",SqlDbType.Int).Value=subID;
cmd.ExecuteNonQuery();
}
}
conn.Close();
//刷新页面，重新绑定数据
GridViewBD();
}
代码：
页面文件代码<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><%@ Import Namespace="System.Data" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>DataList嵌套DataList的使用</title></head><body> <form id="form1" runat="server"> <asp:Button ID="Button1" runat="server" Text="交 卷" OnClick="Button1_Click" /> <!--父DataList开始--> <asp:DataList ID="ExamTest" runat="server"> <ItemTemplate> <%#DataBinder.Eval(Container.DataItem, "SubName")%> <br> <!--子DataList开始--> <asp:DataList runat="server" ID="SubInfo" DataSource='<%#((DataRowView)Container.DataItem).Row.GetChildRows("myrelation") %>'> <ItemTemplate> <%#DataBinder.Eval(Container.DataItem,"[\"Sub\"]") %> <br> <asp:TextBox runat="server" ID="Answer" Text='<%#DataBinder.Eval(Container.DataItem,"[\"Answer\"]") %>'></asp:TextBox> <asp:Label ID="subID" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"[\"ID\"]") %>' Visible="false"></asp:Label> </ItemTemplate> </asp:DataList> <!--子DataList结束--> </ItemTemplate> </asp:DataList> <!--父DataList结束--> </form></body></html>后台代码：
后台代码 protected void Page_Load(object sender, EventArgs e) { if (!this.Page.IsPostBack) { GridViewBD(); } } protected void GridViewBD() { string SqlConn = ConfigurationManager.AppSettings["SqlConn"]; SqlConnection conn = new SqlConnection(SqlConn); SqlDataAdapter dataAda = new SqlDataAdapter("select * from ExamInfo", conn); DataSet dset = new DataSet(); conn.Open(); //读取ExamInfo表,填充父表 dataAda.Fill(dset, "ExamInfo"); SqlDataAdapter dataAda01 = new SqlDataAdapter("select * from PageInfo", conn); //读取PageInfo表,填充子表 dataAda01.Fill(dset, "PageSub"); conn.Close(); //创建父表和子表关系 dset.Relations.Add("myrelation", dset.Tables["ExamInfo"].Columns["ID"], dset.Tables["PageSub"].Columns["PageID"]); //绑定ExamInfo表到父DataList ExamTest.DataSource = dset.Tables["ExamInfo"]; ExamTest.DataBind(); } protected void Button1_Click(object sender, EventArgs e) { string SqlConn = ConfigurationManager.AppSettings["SqlConn"]; SqlConnection conn = new SqlConnection(SqlConn); SqlCommand cmd = new SqlCommand("Update PageInfo Set Answer=@answer where ID=@ID", conn); conn.Open(); foreach (DataListItem item in ExamTest.Items) { DataList subInfo = (DataList)item.FindControl("SubInfo"); foreach(DataListItem childItem in subInfo.Items) { cmd.Parameters.Clear(); string str = ((TextBox)childItem.FindControl("Answer")).Text.ToString(); int subID = Convert.ToInt32( ((Label)childItem.FindControl("subID")).Text.Trim() ); cmd.Parameters.Add("@answer",SqlDbType.VarChar,50).Value=str; cmd.Parameters.Add("@ID",SqlDbType.Int).Value=subID; cmd.ExecuteNonQuery(); } } conn.Close(); //刷新页面，重新绑定数据 GridViewBD(); }