systemmaintain.cs

个人信息的源代码

using System;

namespace Utilities
{
	/// <summary>
	/// 维护系统的功能集中于此。
	/// </summary>
	public class SystemMaintain
	{
		private static string filePath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetEntryAssembly().Location);

		/// <summary>
		/// 备份系统文件
		/// </summary>
		public static void BackupSystemFile()
		{
			try
			{
				//备份数据库
				CopyFile(filePath + @"\infocenter.mdb", filePath + @"\Backup\infocenter.mdb");
				//备份树
				CopyFile(filePath + @"\MainTree.xml", filePath + @"\Backup\MainTree.xml");
				//备份配置文件
				if(System.IO.File.Exists(filePath + @"\PersonalInfo.cfg"))
				{
					CopyFile(filePath + @"\PersonalInfo.cfg", filePath + @"\Backup\PersonalInfo.cfg");
				}
			}
			catch(Exception ex)
			{
				throw new Exception("备份数据时失败，" + ex.Message);
			}
		}
		/// <summary>
		/// 复制文件,如文件在目的地已存在,则删除之
		/// </summary>
		/// <param name="sourceFileName"></param>
		/// <param name="destFileName"></param>
		public static void CopyFile(string sourceFileName, string destFileName)
		{
			try
			{
				if(System.IO.File.Exists(destFileName))//删除已有的文件
				{
					System.IO.File.Delete(destFileName);
				}
				else if(!System.IO.Directory.Exists(filePath + "\\Backup"))
				{
					System.IO.Directory.CreateDirectory(filePath + "\\Backup");
				}
				System.IO.File.Copy(sourceFileName, destFileName);
			}
			catch(Exception ex)
			{
				throw new Exception("操作文件：" + sourceFileName + "---" + destFileName + "时失败，系统给出的信息为：" + ex.Message);
			}
		}
		/// <summary>
		/// 还原系统文件
		/// </summary>
		public static void RestoreSystemFile()
		{
			string filePath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetEntryAssembly().Location);
			try
			{
				//复原数据库
				CopyFile(filePath + @"\Backup\infocenter.mdb", filePath + @"\infocenter.mdb");
                //还原树
				CopyFile(filePath + @"\Backup\MainTree.xml", filePath + @"\MainTree.xml");
				//还原配置文件
				if(System.IO.File.Exists(filePath + @"\Backup\PersonalInfo.cfg"))
				{
					CopyFile(filePath + @"\Backup\PersonalInfo.cfg", filePath + @"\PersonalInfo.cfg");
				}
			}
			catch(Exception ex)
			{
				throw new Exception("还原数据失败，" + ex.Message);
			}
		}
		/// <summary>
		/// 压缩和修复数据库
		/// </summary>
		/// <param name="connectionString">用来连接到Access数据库</param>
		/// <param name="DBFileName">要压缩的MDB文件的全名(路径+文件名)</param>
		public static void CompactAndRepairDB(string connectionString, string DBFileName)
		{
			DBFileName = filePath + @"\" + DBFileName;

			if(!System.IO.File.Exists(DBFileName))
			{
				throw new ApplicationException("找不到文件：" + DBFileName);
			}
			string backupFileName = DBFileName + ".bak";
			try
			{
				object[] oParams;

				//create an inctance of a Jet Replication Object
				object objJRO = Activator.CreateInstance(Type.GetTypeFromProgID("JRO.JetEngine"));

				//filling Parameters array
				//cnahge "Jet OLEDB:Engine Type=5" to an appropriate value
				// or leave it as is if you db is JET4X format (access 2000,2002)
				//(yes, jetengine5 is for JET4X, no misprint here)

				oParams = new object[] {connectionString, "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + backupFileName +";Jet OLEDB:Engine Type=5"};

				//invoke a CompactDatabase method of a JRO object
				//pass Parameters array

				objJRO.GetType().InvokeMember("CompactDatabase", System.Reflection.BindingFlags.InvokeMethod, null, objJRO,	oParams);

				//database is compacted now
				//to a new file backupFileName
				//let's copy it over an old one and delete it

				System.IO.File.Delete(DBFileName);
				System.IO.File.Move(backupFileName, DBFileName);
				//clean up (just in case)
				System.Runtime.InteropServices.Marshal.ReleaseComObject(objJRO);
				objJRO=null;
			}
			catch(Exception ex)
			{
				throw new ApplicationException("在压缩和修复数据库时出错，系统给出的信息为：" + ex.Message);
			}
		}
	}
}