讀寫webconfig

1、1.建立一個(gè)class，ReadWriteConfig.csusing System;using System.Configuration;using System.Reflection;using System.Web;using System.Xml;public enum ConfigFileType    WebConfig,    AppConfignamespace WebApplication1  &#

2、160; /*/ <summary>    / Summary description for ReadWriteConfig.    / </summary>    public class ReadWriteConfig            

3、;        public string docName = String.Empty;         private XmlNode node=null;            private int _configTyp

4、e;          public int ConfigType                    get return _configType;         

5、    set _configType=value;                   SetValue#region SetValue        public bool SetValue(string key, strin

6、g value)                    XmlDocument cfgDoc = new XmlDocument();            loadConfigDoc(cfgDoc);  &#

7、160;            / retrieve the appSettings node               node =  cfgDoc.SelectSingleNode("/appSettings"); 

8、0;                if( node = null )                           

9、60;throw new InvalidOperationException( "appSettings section not found");                             try 

10、0;                               / XPath select setting "add" element that contains this k

11、ey                       XmlElement addElem= (XmlElement)node.SelectSingleNode("/addkey='" +key +"'")      

12、           if(addElem!=null)                                    a

13、ddElem.SetAttribute("value",value);                                    / not found, so we&

14、#160;need to add the element, key and value                   else                 &#

15、160;                  XmlElement entry = cfgDoc.CreateElement("add");                   &#

16、160;entry.SetAttribute("key",key);                        entry.SetAttribute("value",value);           &#

17、160;            node.AppendChild(entry);                                 &#

18、160; /save it                   saveConfigDoc(cfgDoc,docName);                   return true;&#

19、160;                           catch                     

20、60;      return false;                                       #endregio

21、n        saveConfigDoc#region saveConfigDoc        private void saveConfigDoc(XmlDocument cfgDoc,string cfgDocPath)             &#

22、160;      try                            XmlTextWriter writer = new XmlTextWriter( cfgDocPath , 

23、;null );                 writer.Formatting = Formatting.Indented;                    cfgDoc.WriteTo(

24、 writer );                    writer.Flush();                 writer.Close();    

25、0;             return;                          catch        

26、0;                   throw;                             

27、0;       #endregion        removeElement#region removeElement        public bool removeElement (string elementKey)       

28、0;              try                                 XmlDocument&#

29、160;cfgDoc = new XmlDocument();                 loadConfigDoc(cfgDoc);                  / retrieve t

30、he appSettings node                  node =  cfgDoc.SelectSingleNode("/appSettings");               

31、    if( node = null )                                    throw new Inv

32、alidOperationException( "appSettings section not found");                                   

33、60; / XPath select setting "add" element that contains this key to remove                      node.RemoveChild( no

34、de.SelectSingleNode("/addkey='" +elementKey +"'") );                 saveConfigDoc(cfgDoc,docName);            &

35、#160;     return true;                          catch              

36、60;             return false;                                 

37、60;   #endregion        modifyElement#region modifyElement        public bool modifyElement (string elementKey)           

38、60;          try                                 XmlDocument cfgDoc = 

39、new XmlDocument();                 loadConfigDoc(cfgDoc);                  / retrieve the appSettings

40、0;node                  node =  cfgDoc.SelectSingleNode("/appSettings");                   

41、;if( node = null )                                    throw new InvalidOperationException(

42、 "appSettings section not found");                                     / XPath&#

43、160;select setting "add" element that contains this key to remove                      node.RemoveChild(node.SelectSingleNode("/ad

44、dkey='" +elementKey +"'");                 saveConfigDoc(cfgDoc,docName);                  r

45、eturn true;                          catch                    

46、60;       return false;                                     #endregion 

47、;       loadConfigDoc#region loadConfigDoc        private XmlDocument loadConfigDoc( XmlDocument cfgDoc )               

48、         / load the config file               if(  Convert.ToInt32(ConfigType)=Convert.ToInt32(ConfigFileType.AppConfig)     

49、                       docName= (Assembly.GetEntryAssembly().GetName().Name;                 &#

50、160; docName +=   ".exe.config"                         else             &#

51、160;                        cfgDoc.Load( docName );              return cfgDoc;  

52、0;              #endregion    2.建立測試頁面2.1 html<HTML>    <HEAD>        <title>WebForm1</title>     

53、60;  <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">        <meta name="CODE_LANGUAGE" Content="C#">      

54、60; <meta name="vs_defaultClientScript" content="JavaScript">        <meta name="vs_targetSchema" content    </HEAD>    <body MS_POSITIONING=&

55、quot;GridLayout">        <form id="Form1" method="post" runat="server">            <asp:Button id="Button1" style=&quo

56、t;Z-INDEX: 101; LEFT: 296px; POSITION: absolute; TOP: 120px" runat="server"                Text="刪除"></asp:Button>     &#

57、160;      <asp:Button id="Button2" style="Z-INDEX: 102; LEFT: 232px; POSITION: absolute; TOP: 120px" runat="server"            

58、    Text="新增"></asp:Button>            <asp:Label id="Label1" style="Z-INDEX: 103; LEFT: 104px; POSITION: absolute; TOP: 32px" r

59、unat="server">key</asp:Label>            <asp:TextBox id="TextBox1" style="Z-INDEX: 104; LEFT: 168px; POSITION: absolute; TOP: 32px" runat="ser

60、ver"></asp:TextBox>            <asp:Label id="Label2" style="Z-INDEX: 105; LEFT: 104px; POSITION: absolute; TOP: 96px" runat="server">value&

61、lt;/asp:Label>            <asp:TextBox id="TextBox2" style="Z-INDEX: 106; LEFT: 168px; POSITION: absolute; TOP: 80px" runat="server"></asp:TextBox&g

62、t;            <asp:Button id="Button3" style="Z-INDEX: 107; LEFT: 360px; POSITION: absolute; TOP: 120px" runat="server"      &#

63、160;         Text="修改"></asp:Button>        </form>    </body></HTML>2.2 cs代碼public class          

64、0; protected        protected        protected        protected        protected        protect

65、ed        protected            private void Page_Load(object sender, System.EventArgs e)              

66、60;                     Web Form Designer generated code#region Web Form Designer generated code        overri

67、de protected void OnInit(EventArgs e)                    /            / CODEGEN: This call is r

68、equired by the ASP.NET Web Form Designer.            /            InitializeComponent();          &#

69、160; base.OnInit(e);                        /*/ <summary>        / Required method for Designer sup

70、port - do not modify        / the contents of this method with the code editor.        / </summary>       

71、60;private void InitializeComponent()                        this.Button1.Click += new System.EventHandler(this.Button1_Click);    

72、0;       this.Button2.Click += new System.EventHandler(this.Button2_Click);            this.Button3.Click += new System.EventHandler(this.Button3_Click);            this