在net中，在System.Configuration.ConfigurationManager中，提供了几个静态方法，用来修改配置文件。

如:System.Configuration.Configuration config = System.Configuration.ConfigurationManager.OpenMachineConfiguration();

获得应用程序下的配置文件，之后再用config进行操作。

如果是在web中，那就是操作webconfig了！不过现在在winform中，就成了操作app.config了。

于是，我选择了还是以操作xml的方式来修改webconfig。

这里写了几个类，主要也是模仿config的操作方式。代码如下:

代码

using  System;
using  System.Collections.Generic;
using  System.Text;
using  System.Xml;
namespace  IISHelper
{
     public   class  WebConfigHelper : IDisposable
    {
         private   bool  loadIsOK;
         ///   <summary>
         ///  加载是否成功
         ///   </summary>
         public   bool  LoadIsOK
        {
             get  {  return  loadIsOK; }
             set  { loadIsOK  =  value; }
        }

         private  XmlDocument xDox  =   new  XmlDocument();
         private   string  configPath  =   string .Empty;
         public  WebConfigHelper( string  webconfigPath)
        {
             try
            {
                xDox.Load(webconfigPath);
                configPath  =  webconfigPath;
                loadIsOK  =   true ;
            }
             catch  { loadIsOK  =   false ; }
            
        }
         public  WebConfigAppSetting AppSetting
        {
             get
            {
                XmlNode xNode = xDox.SelectSingleNode( " //configuration/appSettings " );
                 if (xNode == null )
                {
                     return   null ;
                }
                 return   new  WebConfigAppSetting( ref  xNode);
            }
        }
         public  WebConfigConnectionStrings ConnectionStrings
        {
             get
            {
                XmlNode xNode  =  xDox.SelectSingleNode( " //configuration/connectionStrings " );
                 if  (xNode  ==   null )
                {
                     return   null ;
                }
                 return   new  WebConfigConnectionStrings( ref  xNode);
            }
        }
         public   bool  Save()
        {
             try
            {
                xDox.Save(configPath);
                 return   true ;
            }
             catch  { }
             return   false ;
        }
         #region  IDisposable 成员
         public   void  Dispose()
        {
            xDox  =   null ;
        }
         #endregion
    }
     public   abstract   class  WebConfigBase
    {
         protected  XmlNode node;
         public    void  Add( string  key,  string  value){}
         public   abstract   void  Set( string  key,  string  value);
         public   abstract   string  Get( string  key);
         public    void  Remove( string  key,  string  value){}
    }
     public   class  WebConfigAppSetting : WebConfigBase
    {
         internal   WebConfigAppSetting( ref  XmlNode xNode)
        {
            node  =  xNode;
        }
         public   override   void  Set( string  key,  string  value)
        {
             foreach  (XmlNode addNode  in  node.ChildNodes)
            {
                 if  (addNode.Attributes  !=   null   &&  addNode.Attributes[ " key " ].Value  ==  key)
                {
                    addNode.Attributes[ " value " ].Value  =  value;
                     break ;
                }
            }
        }
         public   override   string  Get( string  key)
        {
             foreach  (XmlNode addNode  in  node.ChildNodes)
            {
                 if  (addNode.Attributes  !=   null   &&  addNode.Attributes[ " key " ].Value  ==  key)
                {
                   return   addNode.Attributes[ " value " ].Value;
                }
            }
             return   "" ;
        }
    }
     public   class  WebConfigConnectionStrings : WebConfigBase
    {
         internal   WebConfigConnectionStrings( ref  XmlNode xNode)
        {
            node  =  xNode;
        }
         public   override   void  Set( string  key,  string  value)
        {
             foreach  (XmlNode addNode  in  node.ChildNodes)
            {
                 if  (addNode.Attributes  !=   null   &&  addNode.Attributes[ " name " ].Value  ==  key)
                {
                    addNode.Attributes[ " connectionString " ].Value  =  value;
                     break ;
                }
            }
        }
         public   override   string  Get( string  key)
        {
             foreach  (XmlNode addNode  in  node.ChildNodes)
            {
                 if  (addNode.Attributes  !=   null   &&  addNode.Attributes[ " name " ].Value  ==  key)
                {
                     return  addNode.Attributes[ " connectionString " ].Value;
                }
            }
             return   "" ;
        }
    }
}

 下面看一下界面的操作方法：

界面操作方式

 WebConfigHelper allConfig  =   new  WebConfigHelper(allConfigPath);
             if  (allConfig.LoadIsOK )
            {
                WebConfigAppSetting app  =  allConfig.AppSetting;
                 if  (app  !=   null )
                {
                     app.Set( " MosFTPUserName " , txtMosFtpUserName.Text);
                    app.Set( " MosFTPPassword " , txtMosFtpPassword.Text);
                    app.Set( " ProvideFor " , cbbProvideFor.Text);
                  }
                WebConfigConnectionStrings connString  =  allConfig.ConnectionStrings;
                 if  (connString  !=   null )
                {
                    connString.Set( " Conn " , txtConn.Text);
                }
                allConfig.Save();
                allConfig.Dispose();

                 MessageBox.Show( " 配置文件修改成功！ " );
            }

 这里提示一下，web.config中，不要带名称空间，就是xmlns="xxxx一大堆的";

打完，收工！