在轉發器控件中回發后文本框丟失值
[英]Textbox lost values after postback in repeater control
問題描述
我在用戶控件中有一個轉發器控件。 轉發器控件具有標簽和文本框。 單擊一個按鈕，將在轉發器控件中添加新行。 如果我添加一行並在textBox中輸入一些值，然后再次在轉發器控件中添加新行，則在第一行的文本框中輸入的值會丟失。
任何人都可以幫我解決回發后如何保留文本框的價值。
3 個解決方案
解決方案1
4 2012-11-20 17:02:29
您丟失它是因為您沒有在設置文本框值的代碼周圍包裹If If IsPostBack。
因此，每次執行頁面時，該值都會被重置。 包裝將值設置為ispostback的代碼，新值將不會被覆蓋。
if（！Page.IsPostBack）{//設置值}
解決方案2
0 2012-11-20 19:25:29
解決方案3
-1 2012-11-21 19:01:16
我嘗試了一下，找到了解決方案：
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>
希望這可以幫助。 謝謝。
回發后，模型中的值在控制器中丟失
聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.