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我在用户控件中有一个中继器控件。中继器控件有一个标签和一个文本框。单击按钮会在中继器控件中添加一个新行。如果我添加一行并在 textBox 中输入一些值，然后再次在转发器控件中添加一个新行，则在第一行的文本框中输入的值会丢失。

谁能帮助我在回发后如何保留文本框的价值。

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3 回答 3

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您正在丢失它，因为您没有包裹在设置文本框值的代码周围的 If not IsPostBack。

因此，每次执行页面时，值都会被重置。将设置值的代码包装在 ispostback 周围，新值不会被覆盖。

if (!Page.IsPostBack) { // 设置值 }

于 2012-11-20T17:02:29.177 回答
0

您可以从以下链接获得帮助：

http://ranafaisal.wordpress.com/2009/02/17/dynamically-adding-removing-textboxes-in-aspnet-repeater/

于 2012-11-20T19:25:29.930 回答
-1

我已经尝试过自己并找到了解决方案：

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;

    namespace RepeaterTest
    {
        public class Car
        {
            private string _year;
            private string _make;
            private string _model;

            public string Year
            {
                get
                {
                    return _year;
                }
                set
                {
                    _year = value;
                }
            }

            public string Make {
                get { return _make; }
                set { _make=value;}
            }

            public string Model
            {
                get { return _model; }
                set { _model = value; }
            }

            public Car(string year,string make,string model){
                _year = year;
                _make = make;
                _model = model;
        }

            public Car(){
        }

        }
    }


    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Collections;

    namespace RepeaterTest
    {
        public class Cars:CollectionBase
        {

            public int Add(Car car) {
                return List.Add(car);
            } 

        }
    }

    in code behind:
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;

    namespace RepeaterTest
    {
        public partial class WebForm1 : System.Web.UI.Page
        {
            protected void Page_Load(object sender, EventArgs e)
            {
                if (!Page.IsPostBack) {
                    Cars cars = new Cars();
                    Car c1 = new Car("2011", "Marcedez", "Marcedez");
                    Car c2 = new Car("2012", "BMW", "135i");
                   cars.Add(c1);
                   cars.Add(c2);
                    Repeater1.DataSource = cars;
                    Repeater1.DataBind();
                }
            }

            protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
            {
                if (e.CommandName == "Add") {
                    //Car carLastEntered = new Car();
                    Cars cars = new Cars();
                    foreach (RepeaterItem item in Repeater1.Items) {
                        Car car = new Car();
                        car.Year = ((TextBox)(item.FindControl("txtYear"))).Text;
                        car.Make = ((TextBox)(item.FindControl("txtMake"))).Text;
                        car.Model = ((TextBox)(item.FindControl("txtModel"))).Text;
                      cars.Add(car);
                      //carLastEntered = car;

                    }

                    //cars.Add(carLastEntered);
                    Repeater1.DataSource = cars;
                    Repeater1.DataBind();

                }
            }
        }
    }

    in aspx:
    <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="RepeaterTest.WebForm1" %>

    <!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></title>
    </head>
    <body>
        <form id="form1" runat="server">
        <div>
            <asp:Repeater ID="Repeater1" runat="server" 
                onitemcommand="Repeater1_ItemCommand">
             <HeaderTemplate>
            <table cellpadding="0" cellspacing="5">
            <tr style="padding-top: 5px;">
                <td colspan="6">
                    <asp:Label ID="lblInstructions" runat="server" Text="Add your cars here:" />
                </td>
            </tr>
            <tr runat="server" id="trHeader" style="font-weight: bold;">
                <td>Year</td>
                <td>Make</td>
                <td>Model</td>
                <td></td>
                <td></td>
                <td></td>
            </tr>         
        </HeaderTemplate> 
        <ItemTemplate>
            <tr>
                <td><asp:TextBox ID="txtYear" runat="server" Width="65" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "Year")%>' /></td>
                <td><asp:TextBox ID="txtMake" runat="server" Width="70"             
                     Text='<%#DataBinder.Eval(Container.DataItem, "Make")%>' /></td>
                <td><asp:TextBox ID="txtModel" runat="server" Width="70" 
                     Text='<%#DataBinder.Eval(Container.DataItem, "Model")%>' /></td>
            </tr>
        </ItemTemplate> 
        <FooterTemplate>
            <tr style="padding-top: 5px;">
               <td colspan="6">
                   <asp:Button ID="btnAdd" runat="server" 
                    Text="Add Car" CommandName="Add" />
               </td>
            </tr>
            </table>
        </FooterTemplate>
            </asp:Repeater>
        </div>
        </form>
    </body>
    </html>

希望这可以帮助。谢谢。

于 2012-11-21T19:01:16.357 回答