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对web.config进行新增修改删除读取操作

2006-12-19 15:57 766 查看

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>

</HEAD>

<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

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