1.建立一个class，ReadWriteConfig.cs
using System;
using System.Configuration;
using System.Reflection;
using System.Web;
using System.Xml;
public enum ConfigFileType
{
WebConfig,
AppConfig
}
namespace WebApplication1
{
/**//// <summary>
/// Summary description for ReadWriteConfig.
/// </summary>
public class ReadWriteConfig
{
public string docName = String.Empty;
private XmlNode node=null;
private int _configType;
public int ConfigType
{
get{ return _configType; }
set{ _configType=value; }
}
SetValue#region SetValue
public bool SetValue(string key, string value)
{
XmlDocument cfgDoc = new XmlDocument();
loadConfigDoc(cfgDoc);
// retrieve the appSettings node
node = cfgDoc.SelectSingleNode("//appSettings");
if( node == null )
{
throw new InvalidOperationException( "appSettings section not found");
}
try
{
// XPath select setting "add" element that contains this key
XmlElement addElem= (XmlElement)node.SelectSingleNode("//add[@key='" +key +"']") ;
if(addElem!=null)
{
addElem.SetAttribute("value",value);
}
// not found, so we need to add the element, key and value
else
{
XmlElement entry = cfgDoc.CreateElement("add");
entry.SetAttribute("key",key);
entry.SetAttribute("value",value);
node.AppendChild(entry);
}
//save it
saveConfigDoc(cfgDoc,docName);
return true;
}
catch
{
return false;
}
}
#endregion
saveConfigDoc#region saveConfigDoc
private void saveConfigDoc(XmlDocument cfgDoc,string cfgDocPath)
{
try
{
XmlTextWriter writer = new XmlTextWriter( cfgDocPath , null );
writer.Formatting = Formatting.Indented;
cfgDoc.WriteTo( writer );
writer.Flush();
writer.Close();
return;
}
catch
{
throw;
}
}
#endregion
removeElement#region removeElement
public bool removeElement (string elementKey)
{
try
{
XmlDocument cfgDoc = new XmlDocument();
loadConfigDoc(cfgDoc);
// retrieve the appSettings node
node = cfgDoc.SelectSingleNode("//appSettings");
if( node == null )
{
throw new InvalidOperationException( "appSettings section not found");
}
// XPath select setting "add" element that contains this key to remove
node.RemoveChild( node.SelectSingleNode("//add[@key='" +elementKey +"']") );
saveConfigDoc(cfgDoc,docName);
return true;
}
catch
{
return false;
}
}
#endregion
modifyElement#region modifyElement
public bool modifyElement (string elementKey)
{
try
{
XmlDocument cfgDoc = new XmlDocument();
loadConfigDoc(cfgDoc);
// retrieve the appSettings node
node = cfgDoc.SelectSingleNode("//appSettings");
if( node == null )
{
throw new InvalidOperationException( "appSettings section not found");
}
// XPath select setting "add" element that contains this key to remove
node.RemoveChild(node.SelectSingleNode("//add[@key='" +elementKey +"']"));
saveConfigDoc(cfgDoc,docName);
return true;
}
catch
{
return false;
}
}
#endregion
loadConfigDoc#region loadConfigDoc
private XmlDocument loadConfigDoc( XmlDocument cfgDoc )
{
// load the config file
if( Convert.ToInt32(ConfigType)==Convert.ToInt32(ConfigFileType.AppConfig))
{
docName= ((Assembly.GetEntryAssembly()).GetName()).Name;
docName += ".exe.config";
}
else
{
docName=HttpContext.Current.Server.MapPath("web.config");
}
cfgDoc.Load( docName );
return cfgDoc;
}
#endregion
}
}
2.建立测试页面
2.1 html
<HTML>
<HEAD>
<title>WebForm1</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<asp:Button id="Button1" style="Z-INDEX: 101; LEFT: 296px; POSITION: absolute; TOP: 120px" runat="server"
Text="删除"></asp:Button>
<asp:Button id="Button2" style="Z-INDEX: 102; LEFT: 232px; POSITION: absolute; TOP: 120px" runat="server"
Text="新增"></asp:Button>
<asp:Label id="Label1" style="Z-INDEX: 103; LEFT: 104px; POSITION: absolute; TOP: 32px" runat="server">key</asp:Label>
<asp:TextBox id="TextBox1" style="Z-INDEX: 104; LEFT: 168px; POSITION: absolute; TOP: 32px" runat="server"></asp:TextBox>
<asp:Label id="Label2" style="Z-INDEX: 105; LEFT: 104px; POSITION: absolute; TOP: 96px" runat="server">value</asp:Label>
<asp:TextBox id="TextBox2" style="Z-INDEX: 106; LEFT: 168px; POSITION: absolute; TOP: 80px" runat="server"></asp:TextBox>
<asp:Button id="Button3" style="Z-INDEX: 107; LEFT: 360px; POSITION: absolute; TOP: 120px" runat="server"
Text="修改"></asp:Button>
</form>
</body>
</HTML>
2.2 cs代码
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.Label Label2;
protected System.Web.UI.WebControls.TextBox TextBox2;
protected System.Web.UI.WebControls.Button Button3;
protected System.Web.UI.WebControls.Button Button2;
private void Page_Load(object sender, System.EventArgs e)
{
}
Web Form Designer generated code#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}
/**//// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Button2.Click += new System.EventHandler(this.Button2_Click);
this.Button3.Click += new System.EventHandler(this.Button3_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void Button2_Click(object sender, System.EventArgs e)
{
//新增
ReadWriteConfig config = new ReadWriteConfig();
config.ConfigType = (int)ConfigFileType.WebConfig;
config.SetValue(this.TextBox1.Text,this.TextBox2.Text);
}
private void Button1_Click(object sender, System.EventArgs e)
{
//删除
ReadWriteConfig config = new ReadWriteConfig();
config.ConfigType = (int)ConfigFileType.WebConfig;
config.removeElement(this.TextBox1.Text);
}
private void Button3_Click(object sender, System.EventArgs e)
{
//修改
ReadWriteConfig config = new ReadWriteConfig();
config.ConfigType = (int)ConfigFileType.WebConfig;
config.SetValue(this.TextBox1.Text,this.TextBox2.Text);
}
}
3.测试代码下载
/Files/singlepine/readwritconfig.rar