请教动态创建的tablerow在点击按钮后其count为0的问题？

因为写在!ispostback中了,当回发的时候没有执行获取数据的,所以没了
可以先把他保存起来,比如ViewState,Session等

我的这个问题是由http://community.csdn.net/Expert/TopicView3.asp?id=5068412引发而来，由于对viewstate不熟悉，所以请高手们给个代码演示，谢谢！

把动态创建TableRow的代码插到检测其Count的代码前

seesharp(流星追月):
我按照你的方法试过了,可是还是那个现象:只要提交,所有动态生成的tablerow全没了。

我再解释一下我的代码流程：
1、a.aspx负责产生一个带有"|"分隔符的字符串，并利用response.redirect(b.aspx?ss=....)的方式把字符串传送给b.aspx；2、b.aspx获得该字符串并解拆后，根据分隔符的数目动态创建tablerow，在动态生成的tablerow中，最后两列各包含有一个textbox和checkbox另外，在b.aspx上还有一个保存按钮和一个删除按钮。删除按钮的功能是删除由checkbox选中的行，保存按钮的功能是，把每行中的textbox的值以每行第一列的值为条件更新到数据库中。现在的问题是：我选择了某行后，一按删除按钮则刷新后的页面中所有动态生成的行就全没了！我该如何做能解决这个问题？

动态添加的控件在PostBack的时候需要再次添加

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //用ViewState存储拆解结果，假设为ViewState["list"]
            SaveRequestList(Request.QueryString["ss"]);
        }        //根据ViewState["list"]内容添加TableRow
        AddTableRows();
    }    protected void DeleteButton_Click(object sender, EventArgs e)
    {
        //根据CheckBox选择情况更新ViewState["list"]内容
        DeleteRows();
    }    protected void UpdateButton_Click(object sender, EventArgs e)
    {
        //根据ViewState["list"]内容更新数据库
        UpdateRows();
    }

恩,基本上按feifeier48()的做法应该可以
不过可能还要再补充一点:
protected void DeleteButton_Click(object sender, EventArgs e)
    {
        //根据CheckBox选择情况更新ViewState["list"]内容
        DeleteRows();
        AddTableRows();
    }
------------------------------
一按删除按钮则刷新后的页面中所有动态生成的行就全没了
------------------------------
你把b.aspx的page_load和删除按钮这两个函数的关键代码贴出来看下

test.aspx:html代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="share_shopping_test" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <table style="width:100%">
        <tr>
          <td style="width:100%" align="center">
            <asp:Table id="tbl" runat="server" Width="100%" border="1" EnableViewState="false">
              <asp:TableRow>
                <asp:TableCell Width="22%">列 1</asp:TableCell>
                <asp:TableCell Width="40%">列 2</asp:TableCell>
                <asp:TableCell Width="5%">列 3</asp:TableCell>
                <asp:TableCell Width="5%">列 4</asp:TableCell>
              </asp:TableRow>
            </asp:Table>
            <asp:button id="btn" runat="Server" text="btn" OnClick="btn_Click" />
            <asp:Button ID="cmd_del" runat="server" Text="del" OnClick="cmd_del_Click" /></td>
        </tr>
      </table>
    </div>
    </form>
</body>
</html>cs代码:
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;public partial class share_shopping_test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btn_Click(object sender, EventArgs e)
    {
        ArrayList x = new ArrayList();
        if (ViewState["myList"] != null)
        {
            x = (ArrayList)ViewState["myList"];
        }
        x.Add(DateTime.Now.ToString() + "," + DateTime.Now.AddMinutes(1).ToString());
        ViewState["myList"] = x;        for (int i = 0; i < x.Count; i++)
        {
            TableRow tr = new TableRow();
            TableCell tc1 = new TableCell();
            TableCell tc2 = new TableCell();
            TableCell tc3 = new TableCell();
            TableCell tc4 = new TableCell();            TextBox txt_count = new TextBox();
            txt_count.ID = "txtcount" + i.ToString();
            txt_count.Text = "1";            CheckBox cb_sel = new CheckBox();
            cb_sel.ID = "cbsel" + i.ToString();            string[] str = x[i].ToString().Split(',');
            tc1.Text = str[0];
            tc2.Text = str[1];
            tc3.Controls.Add(txt_count);
            tc4.Controls.Add(cb_sel);            tr.Cells.Add(tc1);
            tr.Cells.Add(tc2);
            tr.Cells.Add(tc3);
            tr.Cells.Add(tc4);            tbl.Rows.Add(tr);
        }
    }
    protected void cmd_del_Click(object sender, EventArgs e)
    {
        Response.Write("ss=" + tbl.Rows.Count);
    }
}大家帮我看看怎么做才能到达我想要的要求呢？

我昨天也遇到这个问题，呵呵，去掉 !page.isPostBack

你上面tablerow的生成是放在btn的click事件里,点击delelte按钮时并不会去执行btn_click,所以动态生成的行全没了

按照你在前面说的a.aspx和b.aspx的流程我大概也帮你做了一下,不知道符不符合你的要求

testA.aspx
<%@ Page language="c#" Codebehind="testA.aspx.cs" AutoEventWireup="false" Inherits="MyBlog.Web.testA" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>testA</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<FONT face="宋体"><FONT face="宋体">
<FORM id="Form1" method="post" runat="server">
<FONT face="宋体">
<asp:LinkButton id="LinkButton1" style="Z-INDEX: 101; LEFT: 312px; POSITION: absolute; TOP: 152px"
runat="server">testB.aspx</asp:LinkButton></FONT></FORM>
</FONT></FONT>
</body>
</HTML>testA.aspx.cs
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;namespace MyBlog.Web
{
/// <summary>
/// testA 的摘要说明。
/// </summary>
public class testA : System.Web.UI.Page
{
protected System.Web.UI.WebControls.LinkButton LinkButton1;
protected System.Web.UI.HtmlControls.HtmlForm Form1;

private void Page_Load(object sender, System.EventArgs e)
{

} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.LinkButton1.Click += new System.EventHandler(this.LinkButton1_Click);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void LinkButton1_Click(object sender, System.EventArgs e)
{
Response.Redirect("testB.aspx?s=1|2|3|4|5");
}
}
}

不好意思,开始"连续回复不能超过3次",现补上
testB.aspx:
<%@ Page language="c#" Codebehind="testB.aspx.cs" AutoEventWireup="false" Inherits="MyBlog.Web.testB" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>testB</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<FONT face="宋体">
<asp:Table id="Table1" style="Z-INDEX: 101; LEFT: 256px; POSITION: absolute; TOP: 160px" runat="server"
Width="224px" Height="104px"></asp:Table>
<asp:Button id="Button1" style="Z-INDEX: 102; LEFT: 264px; POSITION: absolute; TOP: 64px" runat="server"
Width="64px" Text="save"></asp:Button>
<asp:Button id="Button2" style="Z-INDEX: 103; LEFT: 416px; POSITION: absolute; TOP: 64px" runat="server"
Text="delete"></asp:Button></FONT>
</form>
</body>
</HTML>testB.aspx.cs:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;namespace MyBlog.Web
{
/// <summary>
/// testB 的摘要说明。
/// </summary>
public class testB : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.Button Button2;
protected System.Web.UI.WebControls.Table Table1;

private void Page_Load(object sender, System.EventArgs e)
{
ArrayList al = new ArrayList();
if(!this.IsPostBack)
{
string s = "";
if(Request.QueryString["s"] != null)
{
s = Request.QueryString["s"];
}
string[] p = s.Split('|');

for(int j=0;j<p.Length;j++)
{
al.Add(p[j]);
}
Session["al"] = al;
}
this.BindTableRow();
} private void BindTableRow()
{
this.Table1.Rows.Clear();
ArrayList al = (ArrayList)Session["al"];
for(int i=0;i<al.Count;i++)
{
TableRow tr = new TableRow();
tr.ID = "row" + i.ToString(); TableCell[] cell = new TableCell[3]; //添加label列
cell[0] = new TableCell();
Label lb = new Label();
lb.ID = "lb" + i.ToString();
lb.Text = al[i].ToString();
cell[0].Controls.Add(lb);
tr.Cells.Add(cell[0]);
//添加textbox列
cell[1] = new TableCell();
TextBox tb = new TextBox();
tb.ID = "tb" + i.ToString();
cell[1].Controls.Add(tb);
tr.Cells.Add(cell[1]); //添加checkbox列
cell[2] = new TableCell();
CheckBox cb = new CheckBox();
cb.ID = "cb" + i.ToString();
cell[2].Controls.Add(cb);
tr.Cells.Add(cell[2]); this.Table1.Rows.Add(tr);
}
} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Button2.Click += new System.EventHandler(this.Button2_Click);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void Button2_Click(object sender, System.EventArgs e)
{
ArrayList al = (ArrayList)Session["al"];
int count = this.Table1.Rows.Count;
for(int j=0;j<count;j++)
{
if((this.FindControl("cb" + j.ToString()) as CheckBox).Checked == true)
{
al.Remove((this.FindControl("lb" + j.ToString()) as Label).Text);
this.Table1.Rows.Remove((this.FindControl("row" + j.ToString()) as TableRow));

}
}
Session["al"] = al;
this.BindTableRow();
} }
}

调试易

请教动态创建的tablerow在点击按钮后其count为0的问题？

解决方案 »