XML内容如下：

复制代码 代码如下:

<?xml version="1.0" encoding="utf-8" ?>

<SystemVersion>

<Item>

<Version_ID>1</Version_ID>

<Version_Name>CN</Version_Name>

</Item>

<Item>

<Version_ID>2</Version_ID>

<Version_Name>EN</Version_Name>

</Item>

</SystemVersion>

用户控件的关键代码：

SystemVersion.ascx

复制代码 代码如下:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="SystemVersion.ascx.cs" Inherits="UserControls_SystemVersion" %>

<>

<div>

<asp:DropDownList ID="ddlVersion" runat="server">

</asp:DropDownList>

</div>

后台文件：

复制代码 代码如下:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Xml;

using System.Xml.Linq;

public partial class UserControls_SystemVersion : System.Web.UI.UserControl

{

private const string CON_FilePath = "~/App_Data/sysVersion.xml";

//// <summary>

/// 下拉框赋值

/// </summary>

public string Value

{

set { ViewState["Value"] = value; }

get { return ViewState["Value"] == null ? null : ViewState["Value"].ToString().Trim(); }

}

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

DdlBind();

}

}

public void DdlBind()

{

XElement xDoc = XElement.Load(Server.MapPath(CON_FilePath));

// Create the query

var lVersion = from c in xDoc.Descendants("Item")

where c.Element("Version_ID").Value == "1" //目前只显示CN

select new

{

Version_Name = c.Element("Version_Name").Value,

Version_ID = c.Element("Version_ID").Value

};

ddlVersion.DataSource = lVersion.ToList();

ddlVersion.DataTextField = "Version_Name";

ddlVersion.DataValueField = "Version_Name";

ddlVersion.DataBind();

if (Value != null)

{

ddlVersion.SelectedValue=Value;

}

}

}