Gridview dropdownlist添加行数据丢失问题

添加行 dropdownlist 与 textbox

Button click事件之后 Dropdownlist 数据便会丢失 Y？

这里的gridview 就 dropdownlist 是获取数据信息
但是是为了添加到另一个表里的
而 button click 添加行后之前dropdownlist 的新选数值被刷新空了
不想 textbox 里的值一样被记录 dropdownlist 又要被重新选择

DropDown 的 autopostback 设置没？或者在 !isPostBack 中？

设置了也不行<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!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>

    </div>
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1"
                            DataTextField="DepartmentN" DataValueField="DepartmentN"
                            AutoPostBack="True" SelectedValue='<%# Eval ("DDL1") %>' >
                        </asp:DropDownList>
                        <asp:SqlDataSource ID="SqlDataSource1" runat="server"
                            ConnectionString="<%$ ConnectionStrings:ETHANConnectionString %>"
                            SelectCommand="SELECT [DepartmentN] FROM [Department]"></asp:SqlDataSource>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:TextBox ID="TextBox2" runat="server" Text='<%# Eval("str2") %>'></asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:TextBox ID="TextBox3" runat="server" Text='<%# Eval("str3") %>'></asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:Button ID="Button1" runat="server" Text="增加行" onclick="Button1_Click" />  
                        <asp:Button ID="Button2" runat="server" Text="删除行" onclick="Button2_Click" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>    </form>
</body>
</html>using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("DDL1");
            dt.Columns.Add("str2");
            dt.Columns.Add("str3");
            for (int i = 0; i < 1; i++)
            {
                DataRow dr = dt.NewRow();
                dt.Rows.Add(dr);
            }
            this.GridView1.DataSource = dt;
            this.GridView1.DataBind();
        }
    }    protected void Button1_Click(object sender, EventArgs e)
    {
        // 行号        int row = ((GridViewRow)((Button)sender).NamingContainer).RowIndex;
        DataTable dt = new DataTable();
        dt.Columns.Add("DDL1");
        dt.Columns.Add("str2");
        dt.Columns.Add("str3");
        foreach (GridViewRow item in this.GridView1.Rows)
        {
            DataRow dr = dt.NewRow();
            dr["DDL1"] = ((DropDownList)item.Cells[0].FindControl("DropDownList1")).SelectedValue;
            dr["str2"] = ((TextBox)item.Cells[1].FindControl("TextBox2")).Text;
            dr["str3"] = ((TextBox)item.Cells[2].FindControl("TextBox3")).Text;
            dt.Rows.Add(dr);
        }
        dt.Rows.InsertAt(dt.NewRow(), row + 1);
        this.GridView1.DataSource = dt;
        this.GridView1.DataBind();
    }    protected void Button2_Click(object sender, EventArgs e)
    {
        // 行号
        int row = ((GridViewRow)((Button)sender).NamingContainer).RowIndex;
        DataTable dt = new DataTable();
        dt.Columns.Add("DDL1");
        dt.Columns.Add("str2");
        dt.Columns.Add("str3");
        foreach (GridViewRow item in this.GridView1.Rows)
        {
            DataRow dr = dt.NewRow();
            dr["DDL1"] = ((DropDownList)item.Cells[0].FindControl("DropDownList1")).SelectedValue;
            dr["str2"] = ((TextBox)item.Cells[0].FindControl("TextBox2")).Text;
            dr["str3"] = ((TextBox)item.Cells[0].FindControl("TextBox3")).Text;
            dt.Rows.Add(dr);
        }
        dt.Rows.RemoveAt(row);
        this.GridView1.DataSource = dt;
        this.GridView1.DataBind();
    }}

调试易

Gridview dropdownlist添加行数据丢失问题

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