神人救我，关于DataList_DeleteCommand的问题

Question

DataList绑定DeleteCommand删除事件 点击删除按钮 所有的信息都没了 但是也没删除
将后台的 if (!Page.IsPostBack) 删除后 DataList的删除功能正常 反之则出现点击删除 列表成空白的 没有实现删除功能 怎么回事 如何解决？

Answer 1

在DeleteCommand的里面，删除操作完成后，重新绑定一下。

Answer 2

绑定了 跟了一下 他压根就没进 
 protected void DataList1_DeleteCommand(object source, DataListCommandEventArgs e)
    {
        int userid = int.Parse(DataList1.DataKeys[e.Item.ItemIndex].ToString());
        try
        {
            DAL.Common.Delete<Entity.Snews>(userid);
            Bind();
        }
        catch (Exception ex)
        {
        }
    }
这方法

Answer 3

加上if (!Page.IsPostBack)点击删除按钮的时候根本就不执行
protected void DataList1_DeleteCommand(object source, DataListCommandEventArgs e)
这方法
如果去掉判定 就一点问题都没有 在线等 知道的帮下 立马结贴

Answer 4

没道理不执行的，是不是没有绑定成功？（包括绑定删除按钮事件和绑定DATALIST）?

Answer 5

源码  using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;public partial class Sp_Main_New : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            Bind();
        }
    }    protected void DataList1_DeleteCommand(object source, DataListCommandEventArgs e)
    {
        int userid = int.Parse(DataList1.DataKeys[e.Item.ItemIndex].ToString());
        try
        {
            DAL.Common.Delete<Entity.Snews>(userid);
            Bind();
        }
        catch (Exception ex)
        {
        }
    }    private int id
    {
        get
        {
            if (Request.QueryString["id"] != null && Request.QueryString["id"].ToString() != "")
            {
                try
                {
                    return int.Parse(Request.QueryString["id"].ToString());
                }
                catch
                {
                    return 0;
                }
            }
            else
                return 0;
        }
    }
    public string returnNews(string con)
    {
        if (!String.IsNullOrEmpty(con))
        {
            if (con.Length >= 30)
            {
                return con.Substring(0, 30) + "..";
            }
            else
            {
                return con;
            }
        }
        else
        {
            return String.Empty;
        }
    }
    protected void AspNetPager1_PageChanged(object sender, EventArgs e)
    {
        Bind();
    }    public void Bind()
    {
        //获取cookie中的id和用户角色类型id
        int uid = 1;//用户id
        int type = 2;//角色id
        if (uid == null)
        {
            Response.Redirect("../../Login.aspx");
        }
        else
        {
            if (type == 2)
            {
                Entity.Gusers gg = DAL.Common.Get<Entity.Gusers>("Uid=" + uid + "");
                Entity.Sp ss = DAL.Common.Get<Entity.Sp>("Gid=" + gg.id + "");
                string sql = "Sid=" + ss.id + "";
                AspNetPager1.RecordCount = DAL.FF.GetNews3(sql);
                Entity.Snews[] Model = DAL.Common.Select<Entity.Snews>(AspNetPager1.PageSize, AspNetPager1.CurrentPageIndex, sql, "Ntime desc");
                if (Model.Length == 0 && AspNetPager1.CurrentPageIndex > 1)
                {
                    AspNetPager1.CurrentPageIndex--;
                    Bind();
                    return;
                }
                DataList1.DataSource = Model;
                DataList1.DataBind();
                if (id > 0)
                {
                    Entity.Snews sn = DAL.Common.Get<Entity.Snews>(id);
                    tit.Text = sn.Tit;
                    wysiwyg.Value = sn.Con;
                }            }
            else
            {
                Response.Redirect("../../Default.aspx");
            }
        }
    }}前台  <asp:DataList ID="DataList1"  runat="server" DataKeyField="ID" Width="700px" OnDeleteCommand="DataList1_DeleteCommand">
                <ItemTemplate>
                    <div class="ne_g1">
                        <div class="mm2 g1">
                             <a href="New.aspx?id=<%# Eval("id") %>">
                                <%# returnNews(Eval("Tit").ToString())%></a>
                        </div>
                        <div class="g2">
                            <%# Eval("Ntime")%>
                        </div>
                        <div class="mm3 g3">
                             <a href="New.aspx?id=<%# Eval("id") %>">修改</a>&nbsp;/&nbsp;<asp:LinkButton ID="lbtnDelete" CommandName="Delete"
                                OnClientClick="return confirm('确定要删除选中的项目吗？一旦删除将不能恢复！');" runat="server">删除</asp:LinkButton>
                        </div>
                    </div>
                </ItemTemplate>
                <AlternatingItemTemplate>
                    <div class="ne_g1">
                        <div class="mm2 g4">
                            <a href="New.aspx?id=<%# Eval("id") %>">
                                <%# returnNews(Eval("Tit").ToString())%></a>
                        </div>
                        <div class="g5">
                            <%# Eval("Ntime")%>
                        </div>
                        <div class="mm3 g6">
                             <a href="New.aspx?id=<%# Eval("id") %>">修改</a>&nbsp;/&nbsp;<asp:LinkButton ID="lbtnDelete" CommandName="Delete"
                                OnClientClick="return confirm('确定要删除选中的项目吗？一旦删除将不能恢复！');" runat="server">删除</asp:LinkButton>
                        </div>
                    </div>
                </AlternatingItemTemplate>
            </asp:DataList>

Answer 6

把<AlternatingItemTemplate>
这个去掉然后AspNetPager1_PageChanged 改成 PageChangeing
 protected void AspNetPager1_PageChanging(object src, Wuqi.Webdiyer.PageChangingEventArgs e)
  {
  AspNetPager1.CurrentPageIndex = e.NewPageIndex;
  Bind();
  }
这样试试
参考http://blog.csdn.net/lee576/archive/2008/10/07/3029046.aspx

Answer 7

DataList视图状态 EnableViewState的属性是为True   就会这样

Answer 8

你看下 你前台的头文件是不是引用正确了 跟你项目的其他页面比较下
<%@ Page Language="C#" AutoEventWireup="true" Codebehind="B_QuerySLMain.aspx.cs"
    Inherits="MARS.Base.B_SL_Main" StylesheetTheme="Default_Page" Theme="Default_Page" %>