Question

我在用户控件中有一个转发器控件。转发器控件具有标签和文本框。单击按钮时，在转发器控件中添加了一个新行。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将丢失。

任何人都可以帮我解决如何在回发后保留文本框的价值。

Answer 1

您正在丢失它，因为您没有在设置文本框值的代码中包含If Not IsPostBack。

因此，每次执行页面时，都会重置该值。包装设置围绕ispostback的值的代码，不会覆盖新值。

if（！Page.IsPostBack）{// set value}

Answer 2

您可以通过以下链接：

获得帮助

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

Answer 3

我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>

希望这会有所帮助。感谢。

在转发器控件中回发后，文本框丢失了值

3 个答案: