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问答

.NET 三层datalist嵌套，如何给最内层的datalist绑定数据？

Astolfou 2021-07-06 14:31:28

前台如下：

<body>
<form id="form1" runat="server">
<div>
</div>
<asp:DataList ID="dlImage" runat="server" OnItemDataBound="dlImageDataBound" RepeatColumns="5" RepeatDirection="Horizontal">
<ItemTemplate>
<div style="border:lpx solid black">
<br />
<asp:DataList ID="dlRelationship" runat="server" Height="126px" Width="189px">
<ItemTemplate>
<asp:Label ID="lbIT_TID" runat="server" Visible="false" Text='<%# Eval("IT_TID") %>' />
<asp:DataList ID="dlTags" runat="server" RepeatColumns="5" RepeatDirection="Horizontal" Height="93px" Width="237px">
<ItemTemplate>
<span><%# Eval ("T_Name") %>
</ItemTemplate>
</asp:DataList>
</ItemTemplate>
</asp:DataList>
<asp:Image ID="Image1" runat="server" Height="172px" ImageUrl='<%# Eval("I_Data") %>' Width="182px" />
<br /><asp:Label ID="lbImageID" runat="server" Visible="false" Text='<%# Eval("I_ID") %>' />描述:<span><%# Eval ("I_Description") %><br />作者:<span><%# Eval ("I_Creator") %><br />创作日期:<span><%# Eval ("I_CreativeDate") %><br />类型:<span><%# Eval ("I_Kind") %><br /><br /></div>
</ItemTemplate>
</asp:DataList>
</form>
</body>

后台如下：

private void BindList()
{
dlImage.DataSource = imagesSrv.GetImages();
dlImage.DataBind();
}
protected void dlImageDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DataList dl = null;
Label labImageID = null;
dl = (DataList)e.Item.FindControl("dlRelationship");
dl.ItemDataBound += new System.Web.UI.WebControls.DataListItemEventHandler(dlRelationship_ItemDataBound);
labImageID = (Label)e.Item.FindControl("lbImageID");
string imageID = labImageID.Text.ToString();
int iImageID = Convert.ToInt32(imageID);
string commandText = "select * from IT";
commandText = commandText + " Where IT_IID=" + iImageID;
string connString = ConfigurationManager.ConnectionStrings["MyImageDataConnectionString"].ConnectionString;
SqlConnection conn = new SqlConnection();
conn.ConnectionString = connString;
conn.Open();
SqlDataAdapter myCommand = new SqlDataAdapter(commandText, conn);
DataSet ds = new DataSet();
myCommand.Fill(ds, "IT");
conn.Close();
dl.DataSource = ds.Tables["IT"];
dl.DataBind();
}
}
protected void dlRelationship_ItemDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DataList dl = null;
Label labTagsID = null;
dl = (DataList)e.Item.FindControl("dlTags");
labTagsID = (Label)e.Item.FindControl("lbIT_TID");
string tagsID = labTagsID.Text.ToString();
int iTagsID = Convert.ToInt32(tagsID);
string commandText = "select * from IT";
commandText = commandText + " Where IT_TID=" + iTagsID;
string connString = ConfigurationManager.ConnectionStrings["MyImageDataConnectionString"].ConnectionString;
SqlConnection conn = new SqlConnection();
conn.ConnectionString = connString;
conn.Open();
SqlDataAdapter myCommand = new SqlDataAdapter(commandText, conn);
DataSet ds = new DataSet();
myCommand.Fill(ds, "Tags");
conn.Close();
dl.DataSource = ds.Tables["Tags"]; ;
dl.DataBind();
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindList();
}
}