(转)对web.config进行增加修改删除的示例

开发时，经常要动态的修改config文件，下面的就是一个实用类。

 

http://www.svnhost.cn/Article/Detail-72.shtml

 

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; }
        }  

        #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

        #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

        #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

        #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

        #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
    }
}

 

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