APP.config/web.config编辑类

 

using  System;
using  System.Configuration;
using  System.Reflection;
using  System.Web;
using  System.Xml;

public   enum  ConfigFileType
{
    WebConfig,
    AppConfig
}

namespace  fenghua.Configuration
{
    /**//// <summary>
    /// AppConfig 的摘要说明。
    /// </summary>
    public class AppConfig : AppSettingsReader
    {  
        public string docName = String.Empty; 
        private XmlNode node=null;    
        private int _configType;  
        public int ConfigType
        {
            get{ return _configType; }
            set{ _configType=value; }
        }  

        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;
            } 
        }  
        
        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;
            }
        } 
        
        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;
            } 
        }  
        
        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;
        } 
    }
}

使用方法：

1.app.config

  private void Form1_Load(object sender, System.EventArgs e)
  {
   AppConfig config = new AppConfig(); 
   config.ConfigType= (int)ConfigFileType.AppConfig;
 
   
   bool   bln=  (bool)( config.GetValue( "Boolean", typeof( bool ) ) );
   string  str= (string)( config.GetValue( "String", typeof( string ) ) );
   DateTime date = (DateTime)( config.GetValue( "DateTime", typeof( DateTime ) ) ); 
  
 
   bln  = !bln;
   str  = str + "-" + "there";
   date = date.AddDays( 1 ); 
  
   config.SetValue( "Boolean", bln.ToString() );
   config.SetValue( "String", str ); 
   config.SetValue( "DateTime", date.ToShortDateString() );  
   config.SetValue("testing", "1234506");
 
   config.SetValue("howdy", "there");
   string  str2= (string)( config.GetValue( "howdy", typeof( string ) ) );
   
  
   textBox1.Text+= bln +"         ";
   textBox1.Text+= str2+"      " ; 
   textBox1.Text+= date.ToShortDateString()+"       " ; 
   // uncomment to see element removed
   //config.removeElement("howdy");
  }

2.修改web.config：

 

  private void Page_Load(object sender, System.EventArgs e)
  {
 
   AppConfig config = new AppConfig();
   //config.ConfigType = (int)ConfigFileType.WebConfig;
  
    
   bool   bln=  (bool)( config.GetValue( "Boolean", typeof( bool ) ) );
   string  str= (string)( config.GetValue( "String", typeof( string ) ) );
   DateTime date = (DateTime)( config.GetValue( "DateTime", typeof( DateTime ) ) ); 
  
   bln  = !bln;
   str  = str + "-" + "there";
   date = date.AddDays( 1 ); 
  
   config.SetValue( "Boolean", bln.ToString() );
   config.SetValue( "String", str ); 
   config.SetValue( "DateTime", date.ToShortDateString() );  
   config.SetValue("testing", "1234506");
   config.SetValue("howdy", "there");
              string  str2= (string)( config.GetValue( "howdy", typeof( string ) ) );
   
  
   Response.Write( bln + "<BR>" );
   Response.Write( str2  + "<BR>"); 
   Response.Write( date.ToShortDateString() + "<BR>" ); 
   // uncomment to see element removed
   //config.removeElement("howdy");

  }