从网上找的配置文件类,比我原来的好,能用在winform和webform项目中

能用在两种项目中,比较不错

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

public   enum  ConfigFileType
{
    WebConfig,
    AppConfig
}

namespace  TexSelect
{
    /**//**//**//// <summary>
    /// 配置文件操作类
    /// </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:

string  sqlConnText = "" ;

            AppConfig appconfig = new  AppConfig();
            appconfig.ConfigType = ( int )ConfigFileType.WebConfig;

            sqlConnText = ( string )appconfig.GetValue( " SQLConnectionString " ,sqlConnText.GetType());

设置方法:
项目为web项目,则配置信息存在web.config文件中,使用时:appconfig.ConfigType=(int)ConfigFileType.WebConfig;
项目为win项目,则配置信息存在app.config文件中,使用时:appconfig.ConfigType=(int)ConfigFileType.AppConfig;

配置文件示例:
不论在web.config中还是在app.config中都放在<configuration></configuration>之间,格式如下:

  < appSettings >

      < add key = " SQLConnectionString "  value = " Server=127.0.0.1;database=tex;uid=sa;pwd=sa "   />
         
   </ appSettings >