Question

我有以下* .aspx页面

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Test.aspx.cs" Inherits="Admin_Test" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form2" runat="server">
<div>
    <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" DataTextField="Name" DataValueField="FieldKey" />

    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

</div>
</form>
</body>
</html>

和* .aspx.cs页面

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Generic;
using System.Linq;

public partial class Admin_Test : System.Web.UI.Page 
{
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataClassesDataContext datacontext = new DataClassesDataContext();
        DropDownList1.DataSource = datacontext.GetAllDepartments(false);
        DropDownList1.DataBind();
    }


}
}

当我更改dropdownList中的值（在浏览器中）时，它会执行PostBack，但它会在PostBack之后选择列表的第一项 - 它不会保存我的值。

GetAllDepartments（isDeleted）是一个存储过程，它返回一个具有两个属性的对象List - FieldKey和Name。

Answer 1

您可以像这样设置事件：

protected void Page_Load(object sender, EventArgs e)
{
    DropDownList1.SelectedIndexChanged += new System.EventHandler(this.On_SelectedIndexChanged);

    if (!IsPostBack)
    {
        DataClassesDataContext datacontext = new DataClassesDataContext();
        DropDownList1.DataSource = datacontext.GetAllDepartments(false);
        DropDownList1.DataBind();
    }


}

Answer 2

在我看来，ViewState存在问题。你以某种方式禁用了ViewState吗？

Answer 3

我找到了答案 - * .dbml已过时，GetAllDepartments会将每个FieldKey重新调整为0 - 因此，项目的值重复。

AutoPostBack =“true”对于带有DataSource的DropDownList不起作用

3 个答案: