readwriteconfig.aspx.cs

来自「asp.net专家200问(含源代码解决法案」· CS 代码 · 共 112 行

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Xml;
namespace Writeconfig
{
	/// <summary>
	/// WebForm1 的摘要说明。
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DropDownList DropDownList1;
		protected System.Web.UI.WebControls.Button Writebtn;
		protected System.Web.UI.WebControls.Label Label1;
		protected System.Web.UI.WebControls.TextBox TextBox1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				read();
			}
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.Writebtn.Click += new System.EventHandler(this.Writebtn_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void Writebtn_Click(object sender, System.EventArgs e)
		{
			write();
			read();
		}

		public void read()
		{
			string filename=Server.MapPath("") + @"\Web.config";
			XmlDocument  xmldoc= new XmlDocument();
			xmldoc.Load(filename);

			XmlNodeList topM=xmldoc.DocumentElement.ChildNodes;
			foreach(XmlElement element in topM)
			{
				if(element.Name=="appSettings")
				{
					XmlNodeList node=element.ChildNodes;
					if ( node.Count > 0 )
					{
						DropDownList1.Items.Clear();
						foreach(XmlElement el in node)
						{
							DropDownList1.Items.Add(el.Attributes["key"].InnerXml);
						}
					}
				}
			}
		}

		public void write()
		{
			string filename=Server.MapPath("") + @"\Web.config";
			XmlDocument  xmldoc= new XmlDocument();
			xmldoc.Load(filename);

			XmlNodeList topM=xmldoc.DocumentElement.ChildNodes;
			foreach(XmlElement element in topM)
			{
				if(element.Name=="appSettings")
				{
					XmlNodeList node=element.ChildNodes;
					if ( node.Count > 0 ) 
					{
						foreach(XmlElement el in node)
						{
							if(el.Attributes["key"].InnerXml.ToLower()==this.DropDownList1.SelectedItem.Value.ToLower())
							{
								el.Attributes["key"].Value=this.TextBox1.Text;
							}
						}
					}
				}
			}
			xmldoc.Save(filename);
		}
	}
}