ASP.NET Repeater控件

        <asp:Repeater ID="Repeater1" runat="server" DataSourceID="ObjectDataSource1" 
            onitemdatabound="Repeater1_ItemDataBound">
            <ItemTemplate>
                <asp:Label ID="LabelName" runat="server" Text='<%#Eval("NickName") %>' />
            
            </ItemTemplate>
        </asp:Repeater>

    protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            DataRowView row = e.Item.DataItem as DataRowView;
            if (row["NickName"].ToString().Length > 4)
            {
                Label label = e.Item.FindControl("LabelName") as Label;
                label.ForeColor = Color.Red;
            }
        }
    }

服务端控件数据绑定时属性必须用单引号''

<asp:Label ID="LabelName" runat="server" Text='<%#Eval("NickName") %>' />

还可以参考

http://msdn.microsoft.com/zh-cn/library/system.web.ui.webcontrols.repeater.onitemdatabound.aspx