ASP.NET和C＃保留动态添加 <li> 回发内容

Question

Issue Definition 问题定义

Using this basic example to reproduce the issue. 使用此基本示例重现该问题。 When pressing button (causes post back) my <li> disappears and leaves behind an empty <ol> tag as expected. 当按下按钮（导致回发）时，我的<li>消失了，并留了一个空的<ol>标记。 I am dynamically adding <li> tags in the C# code behind page see example provided. 我正在页面后面的C＃代码中动态添加<li>标记，请参见提供的示例。 I am trying to retain this information across post backs. 我试图在回发中保留此信息。 Any help is greatly appreciated. 任何帮助是极大的赞赏。

ASP.NET Code ASP.NET代码

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="State.Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Example</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <ol id="myOl" runat="server">
            </ol>
            <asp:Button ID="Button1" runat="server" Text="Button" />
            <asp:TextBox ID="TextBox1" runat="server" Text=""></asp:TextBox>
        </div>
    </form>
</body>
</html>

C# Code C＃代码

    protected void Page_Load(object sender, EventArgs e)
    {
        EnableViewState = false;
        if (TextBox1.Text == string.Empty)
            PopulateTextBoxes(TextBox1, myOl);
    }

    private static void PopulateTextBoxes(ITextControl textBox1, Control bulletedList)
    {
        textBox1.Text = "TextBox1";
        var li = new ListItem`enter code here`
        {
            Text = "Item1"
        };
        var bl = new BulletedList();
        bl.Items.Add(li);
        bl.DataBind();
        bulletedList.Controls.Add(bl);
    }

Answer 1

Actually I'm not sure what you are trying, but when you want a bullet list, that adds items on each button click try this one: 实际上，我不确定您要尝试什么，但是当您想要一个项目符号列表时，该列表在每个按钮上添加了项目，请单击以下按钮：

ASPX ASPX

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs"   Inherits="WebApplication2.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
     <div>
            <asp:BulletedList runat="server" ID="bulletList"/>
            <asp:Button ID="Button1" runat="server" Text="Button" />
            <asp:TextBox ID="TextBox1" runat="server" Text=""></asp:TextBox>
        </div>
    </form>
</body>
</html>

Codebehind 代码隐藏

public partial class WebForm1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
             if (TextBox1.Text == string.Empty)
             {
                 PopulateTextBoxes();
             }
    }

    private void PopulateTextBoxes()
    {

            var li = new ListItem()
            {
                Text = "Item1"
            };
            bulletList.Items.Add(li);
    }
}

Here's some more info about the BulletedList control: MSDN 这是有关BulletedList控件的更多信息： MSDN

When you disable ViewState, the page cannot maintain its state between postbacks, so you should disable it only, when you need to reduce network traffic. 禁用ViewState时，页面无法在回发之间保持其状态，因此仅在需要减少网络流量时才应禁用它。

ASP.NET和C＃保留动态添加 <li> 回发内容

问题描述

Issue Definition 问题定义

ASP.NET Code ASP.NET代码

C# Code C＃代码

1 个解决方案

解决方案1
0 2015-09-02 06:30:47

ASP.NET和C＃保留动态添加 <li> 回发内容

问题描述

Issue Definition 问题定义

ASP.NET Code ASP.NET代码

C# Code C＃代码

1 个解决方案

解决方案1 0 2015-09-02 06:30:47

解决方案1
0 2015-09-02 06:30:47