读写XML文件的类及注册表操作

读写系统配置信息在win32下常用注册表,在.net下可以沿用这种方法
using Microsoft.Win32;
RegistryKey regKey = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN",true);
regKey.SetValue ("AutoSendLogMail", ExefileName); 
regKey.DeleteValue ("AutoSendLogMail",false);

但更好的方法是写到XML文件中,优点是修改和移植方便,并且可以将元素和类的属性进行映射,序列化与反序列化;
于是参考.Text中相关的类写了一个读写XML文件的类
用于WinForm程序

using System;
using System.IO;
using System.Xml.Serialization;
using System.Xml;
using System.Configuration;

namespace SendLogMail
{
    public abstract class SystemConfiguration
    {
        public static SystemSettings GetSettings()
        {            
            FileStream fs=null;
            string FileName="";
            SystemSettings data;
            XmlSerializer serializer = new XmlSerializer(typeof(SystemSettings));
            try
            {
                FileName = System.Windows.Forms.Application.StartupPath+"\\"+GetSettingsFile();                
                fs = new FileStream(FileName, FileMode.OpenOrCreate);    
                data = (SystemSettings)serializer.Deserialize(fs);                                
            }
            catch (Exception err)
            {
                System.Windows.Forms .MessageBox.Show (err.Message+"系统配置文件出错：\r\n"+FileName);
                data = new SystemSettings();
            }    
            finally
            {
                if (fs!=null) { fs.Close();}                
            }
            return data;
        }

        public static void SaveSettings(SystemSettings data)
        {
            FileStream fs=null;
            string FileName="";
            XmlSerializer serializer = new XmlSerializer (typeof(SystemSettings));             
            try
            {
                FileName  = System.Windows.Forms.Application.StartupPath+"\\"+GetSettingsFile();
                fs = new FileStream(FileName, FileMode.Create);
                serializer.Serialize(fs, data);
            }
            catch (Exception err)
            {
                System.Windows.Forms .MessageBox.Show (err.Message+"系统配置文件出错：\r\n"+FileName);                
            }    
            finally
            {
                if (fs!=null)
                {
                    fs.Close();  
                }                
            }
        }

        private static string GetSettingsFile()
        {
            return ConfigurationSettings.AppSettings["SystemSettingsFile"];            
        }
    }    
    
    public class SystemSettings
    {        
        private string _txtSMTPHost;
        private string _txtSPSHost;
                
        [XmlElement]
        public string txtSMTPHost
        {
            get { return _txtSMTPHost; }
            set { _txtSMTPHost = value; }
        }        
        [XmlElement]
        public string txtSPSHost
        {
            get { return _txtSPSHost; }
            set { _txtSPSHost = value; }
        }