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ASP.NET DataList嵌套实现评论效果

问题:

Datalist1显示say这个表的数据   



然后想在Datalist1中嵌套一个Datalist2用于显示对应的评论

表2的 sayID对应表1的id,若表2中找不到对应sayId则在对应的Datalist1中不显示Datalist2.
难点在于如何达到“林夏”的说说下面只显示“黄磊”、“叶伟信”的评论,“韩寒”的下面只显示“程程”的评论。(林夏的id是3,所以查询对应的表2中sayId为3的行)。

 

代码

前台代码:

<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;">评论列表</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>
                        来自<%# Eval("place") %><%# Eval("username") %><%# Eval("date") %>发表
                    </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") %>的评论<%#Eval("date") %>
                                </div>
                                <div>评论内容:<%#Eval("text") %> </div>
                            </div>
                        </ItemTemplate>
                    </asp:DataList>
                </ItemTemplate>
            </asp:DataList>
        </div>
    </form>
</body>
</html>

后台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", "这个...", "2014.6", "伦敦");
            dtParent.Rows.Add(2, "韩寒", "潮流...", "2015.7", "湖南");
            dtParent.Rows.Add(3, "林夏", "岁月...", "2016.2", "小城");
            dtParent.Rows.Add(4, "王菲", "我会...", "2015.9", "香港");
            dtParent.Rows.Add(5, "郭敬明", "我们...", "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, "黄磊", "我是第一个评说", "2016.6.17 13:06:12");
            dtChild.Rows.Add(3, 3, "叶伟信", "评论林夏的说", "2016.6.17 12:26:43");
            dtChild.Rows.Add(4, 2, "程程", "我评论韩寒", "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();
            }
        }

后台代码中数据源部分可以用ado.net查询数据库方式替换。

效果图:

 

posted @ 2016-06-19 21:20  guwei4037  阅读(3013)  评论(0编辑  收藏  举报