ASP.NET DataList巢狀實現評論效果
阿新 • • 發佈:2018-12-31
問題:
Datalist1顯示say這個表的資料
然後想在Datalist1中巢狀一個Datalist2用於顯示對應的評論
表2的 sayID對應表1的id,若表2中找不到對應sayId則在對應的Datalist1中不顯示Datalist2.
難點在於如何達到“林夏”的說說下面只顯示“黃磊”、“葉偉信”的評論,“韓寒”的下面只顯示“程程”的評論。(林夏的id是3,所以查詢對應的表2中sayId為3的行)。
程式碼
前臺程式碼:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<link href="Content/bootstrap.css" rel="stylesheet" />
</head>
<body>
<form id="form1" runat="server">
<h2 style="text-align:center;">評論列表</h2>
<div align="center" style="margin-top:20px;">
<asp:DataList ID="DataList1" runat="server" OnItemDataBound="DataList1_ItemDataBound" Width="50%" CssClass="table table-bordered"
CellPadding="0" CellSpacing="0">
<ItemTemplate>
<div >
來自<%# Eval("place") %>的<%# Eval("username") %>於<%# Eval("date") %>發表
</div>
<div>
<%# Eval("text") %>
</div>
<asp:DataList ID="DataList2" runat="server" Width="100%">
<ItemTemplate>
<div style="border: 1px dashed black; margin: 1px;">
<div>
<%#Eval("username") %>的評論<%#Eval("date") %>
</div>
<div>評論內容:<%#Eval("text") %> </div>
</div>
</ItemTemplate>
</asp:DataList>
</ItemTemplate>
</asp:DataList>
</div>
</form>
</body>
</html>
後臺cs:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
this.DataList1.DataSource = Data();
this.DataList1.DataBind();
}
}
public DataSet Data()
{
DataSet ds = new DataSet();
DataTable dtParent = new DataTable();
dtParent.Columns.Add("id", typeof(int));
dtParent.Columns.Add("username", typeof(string));
dtParent.Columns.Add("text", typeof(string));
dtParent.Columns.Add("date", typeof(string));
dtParent.Columns.Add("place", typeof(string));
dtParent.Rows.Add(1, "摩根", "這個...", "2014.6", "倫敦");
dtParent.Rows.Add(2, "韓寒", "潮流...", "2015.7", "湖南");
dtParent.Rows.Add(3, "林夏", "歲月...", "2016.2", "小城");
dtParent.Rows.Add(4, "王菲", "我會...", "2015.9", "香港");
dtParent.Rows.Add(5, "郭敬明", "我們...", "2015.1", "上海");
DataTable dtChild = new DataTable();
dtChild.Columns.Add("id", typeof(int));
dtChild.Columns.Add("sayId", typeof(int));
dtChild.Columns.Add("username", typeof(string));
dtChild.Columns.Add("text", typeof(string));
dtChild.Columns.Add("date", typeof(string));
dtChild.Rows.Add(1, 3, "黃磊", "我是第一個評說", "2016.6.17 13:06:12");
dtChild.Rows.Add(3, 3, "葉偉信", "評論林夏的說", "2016.6.17 12:26:43");
dtChild.Rows.Add(4, 2, "程程", "我評論韓寒", "2015.3.1 15:20:10");
ds.Tables.AddRange(new DataTable[] { dtParent, dtChild });
DataRelation dr = new DataRelation("relation", dtParent.Columns["id"], dtChild.Columns["sayId"]);
ds.Relations.Add(dr);
dtParent = ds.Relations["relation"].ParentTable;
dtChild = ds.Relations["relation"].ChildTable;
return ds;
}
protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DataList dataList = e.Item.FindControl("DataList2") as DataList;
DataRowView rowv = (DataRowView)e.Item.DataItem;
DataRow[] rows = Data().Tables[1].Select("sayId='" + rowv["id"].ToString() + "'");
DataTable dt = Data().Tables[1].Clone();
foreach (DataRow dr in rows)
{
dt.ImportRow(dr);
}
dataList.DataSource = dt;
dataList.DataBind();
}
}
後臺程式碼中資料來源部分可以用ado.net查詢資料庫方式替換。
效果圖: