CommandHandler;Fields#regionFieldsprivatestringfileName;privateFileSystemWatcherwatcher;privateSystem." />

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C#中利用FileSystemWatcher對單個文件內容的監視

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在項目中需要用 FileSystemWatcher對單個文件內容進行監視，文件中每添加一行則需要Fire相應的事件，代碼如下

??? public ? class ?CommandWatcher
???? {


???????? public ? event ?EventHandler < CommandEventArgs > ?CommandHandler;
??????

???????? Fields ?Fields


???????? public ?CommandWatcher( string ?cmdfile)
???????? {
???????????? this .fileName? = ?cmdfile;
????????????isChangeImmediate? = ? true ;

?????????
????????}



????????
???????? //
???????? // ?Summary:
???????? // ?????Raises?the?System.IO.FileSystemWatcher.Changed?event.
???????? //
???????? // ?Parameters:
???????? // ???e:
???????? // ?????A?System.IO.FileSystemEventArgs?that?contains?the?event?data.
???????? protected ? void ?OnChanged( object ?sender,?FileSystemEventArgs?e)???
???????? {
????????????ReloadFile();
????????}


????
???????? //
???????? // ?Summary:
???????? // ?????Raises?the?System.IO.FileSystemWatcher.Error?event.
???????? //
???????? // ?Parameters:
???????? // ???e:
???????? // ?????An?System.IO.ErrorEventArgs?that?contains?the?event?data.
???????? protected ? void ?OnError( object ?sender,?ErrorEventArgs?e)
???????? {

????????}

???????? //
???????? // ?Summary:
???????? // ?????Raises?the?System.IO.FileSystemWatcher.Renamed?event.
???????? //
???????? // ?Parameters:
???????? // ???e:
???????? // ?????A?System.IO.RenamedEventArgs?that?contains?the?event?data.
???????? protected ? void ?OnRenamed( object ?sender,?RenamedEventArgs?e)
???????? {

????????}



???????? /// ? <summary>
???????? /// ?Hook?up?for?the?currently?selected?monitoring?method.
???????? /// ? </summary>
???????? public ? void ?Start()
???????? {
???????????? if ?(isChangeImmediate)
???????????? {
???????????????? // ?stop?timer?if?running
????????????????ClearTimer();
???????????????? // ?If?a?file?is?set?and?the?watcher?has?not?been?set?up?yet?then?create?it
???????????????? if ?( null ? != ?fileName? && ? null ? == ?watcher)
???????????????? {
???????????????????? string ?path? = ?Path.GetDirectoryName(fileName);
???????????????????? string ?baseName? = ?Path.GetFileName(fileName);
???????????????????? // ?Use?the?FileSystemWatcher?class?to?detect?changes?to?the?log?file?immediately
???????????????????? // ?We?must?watch?for?Changed,?Created,?Deleted,?and?Renamed?events?to?cover?all?cases
????????????????????watcher? = ? new ?System.IO.FileSystemWatcher(path,?baseName);
????????????????????FileSystemEventHandler?handler? = ? new ?FileSystemEventHandler(OnChanged);
????????????????????watcher.Changed? += ?handler;
????????????????????watcher.Created? += ?handler;
????????????????????watcher.Deleted? += ?handler;
????????????????????watcher.Renamed? += ?OnRenamed;
???????????????????? // ?Without?setting?EnableRaisingEvents?nothing?happens
????????????????????watcher.EnableRaisingEvents? = ? true ;
????????????????}
????????????}
???????????? else
???????????? {
???????????????? // ?On?a?timer?so?clear?the?watcher?if?previously?set?up
????????????????ClearWatcher();
???????????????? int ?numSeconds? = ? 5 ;
???????????????
???????????????? if ?( null ? != ?timer)
???????????????? {
???????????????????? // ?Timer?is?already?running?so?just?make?sure?the?interval?is?correct
???????????????????? if ?(timer.Interval? != ? 1000 ? * ?numSeconds)
???????????????????? {
????????????????????????timer.Interval? = ? 1000 ? * ?numSeconds;
????????????????????}
????????????????}
???????????????? else
???????????????? {
???????????????????? // ?Fire?up?a?timer?if?the?user?entered?a?valid?time?interval
???????????????????? if ?( 0 ? != ?numSeconds)
???????????????????? {
????????????????????????timer? = ? new ?System.Windows.Forms.Timer();
????????????????????????timer.Interval? = ? 1000 ? * ?numSeconds;
????????????????????????timer.Tick? += ?timerTick;
????????????????????????timer.Start();
????????????????????}
????????????????}
????????????}
???????????? this .ReloadFile();
????????}

???????? void ?timerTick( object ?sender,?EventArgs?e)
???????? {
????????????UpdateBasedOnFileTime();
????????}


???????? /// ? <summary>
???????? /// ?Update?the?log?file?if?the?modified?timestamp?has?changed?since?the?last?time?the?file?was?read.
???????? /// ? </summary>
???????? private ? void ?UpdateBasedOnFileTime()
???????? {
???????????? if ?( null ? != ?fileName)
???????????? {
???????????????? // ?This?returns?"12:00?midnight,?January?1,?1601?A.D."?if?the?file?does?not?exist
????????????????DateTime?newLastModifiedTime? = ?File.GetLastWriteTime(fileName);
???????????????? if ?((newLastModifiedTime.Year? < ? 1620 ? && ?newLastModifiedTime? != ?lastModifiedTime)
???????????????????? || ?newLastModifiedTime? > ?lastModifiedTime)
???????????????? {
???????????????????? // OnLogFileChanged();
????????????????????ReloadFile();
????????????????}
????????????}
????????}
???????? /// ? <summary>
???????? /// ?Read?the?log?file.
???????? /// ? </summary>
???????? /// ? <remarks> If?the?user?has?some?text?selected?then?keep?that?text?selected. </remarks>
???????? private ? void ?ReloadFile()
???????? {
???????????? if ?(reloadingFile)? return ;? // ?already?busy?doing?this
????????????reloadingFile? = ? true ;
???????????? try
???????????? {
???????????????? if ?( null ? == ?fileName)
???????????????? {
??????????????????? // ?textBoxContents.Text?=?"";
????????????????}
???????????????? else
???????????????? {
???????????????????? string ?newFileLines? = ? "" ;
????????????????????lastModifiedTime? = ?File.GetLastWriteTime(fileName);? // ?Remember?when?we?last?read?in?this?file
???????????????????? long ?newLength? = ? 0 ;?? // ?will?be?set?properly?later?if?all?is?well
???????????????????? bool ?fileExists? = ?File.Exists(fileName);
???????????????????? bool ?needToClear? = ? ! fileExists;
???????????????????? if ?(fileExists)
???????????????????? {
???????????????????????? // ?It?is?possible?the?file?will?be?in?use?when?we?read?it?(especially?if?using?Immediate?mode)
???????????????????????? // ?So,?we?will?try?up?to?5?times?to?access?the?file
???????????????????????? int ?count? = ? 0 ;
???????????????????????? bool ?success? = ? false ;
???????????????????????? while ?(count? < ? 5 ? && ? ! success)
???????????????????????? {
???????????????????????????? try
???????????????????????????? {
???????????????????????????????? // ?Open?with?the?least?amount?of?locking?possible
???????????????????????????????? using ?(FileStream?stream? = ?File.Open(fileName,?FileMode.Open,?FileAccess.ReadWrite,?FileShare.ReadWrite))
???????????????????????????????? {
????????????????????????????????????newLength? = ?stream.Length;
???????????????????????????????????? if ?(newLength? >= ?lastFileSize)
???????????????????????????????????? {
????????????????????????????????????????stream.Position? = ?lastFileSize;?? // ?Only?read?in?new?lines?added
????????????????????????????????????}
???????????????????????????????????? else
???????????????????????????????????? {
????????????????????????????????????????needToClear? = ? true ;
????????????????????????????????????}
???????????????????????????????????? using ?(StreamReader?reader? = ? new ?StreamReader(stream))
???????????????????????????????????? {
????????????????????????????????????????newFileLines? = ?reader.ReadToEnd();

???????????????????????????????????????? if ?(newFileLines? != ? string .Empty)
???????????????????????????????????????? {
???????????????????????????????????????????? if ?( this .CommandHandler? != ? null )
???????????????????????????????????????????????? this .CommandHandler( this ,? new ?CommandEventArgs(newFileLines));
????????????????????????????????????????}
??????????????????????????????????????
???????????????????????????????????????? // string?[]tmp?=?newFileLines.Split(seprater,?StringSplitOptions.RemoveEmptyEntries);

????????????????????????????????????}
????????????????????????????????}
????????????????????????????????success? = ? true ;
????????????????????????????}
???????????????????????????? catch ?(IOException)
???????????????????????????? {
????????????????????????????????System.Threading.Thread.Sleep( 50 );? // ?Give?a?little?while?to?free?up?file
????????????????????????????}
???????????????????????????? ++ count;
????????????????????????}
????????????????????}
???????????????????? // ?Remember?the?current?file?length?so?we?can?read?only?newly?added?log?lines?the?next?time?the?log?file?is?read
????????????????????lastFileSize? = ?newLength;
???????????????????? if (lastFileSize? > ? 1024 ? * ? 1024 ? * ? 2 )
???????????????????? {
????????????????????????File.Delete(fileName);
????????????????????????File.Create(fileName);
????????????????????} ???????????????????
???????????????
???????????????????? if ?( 0 ? != ?newFileLines.Length)
???????????????????? {
???????????????????????? // ?See?if?this?log?file?has?proper?cr/lf?and?if?not?convert
???????????????????????? int ?lastCr? = ?newFileLines.LastIndexOf( ' \n ' );
???????????????????????? if ?( - 1 ? != ?lastCr? && ? 0 ? < ?lastCr)
???????????????????????? {
???????????????????????????? if ?(newFileLines[lastCr? - ? 1 ]? != ? ' \r ' )
???????????????????????????? {
???????????????????????????????? // ?OK,?this?file?only?has?Cr?and?we?need?to?convert?to?CrLf
????????????????????????????????newFileLines? = ?newFileLines.Replace( " \n " ,? " \r\n " );
????????????????????????????}
????????????????????????}
????????????????????}
????????????????????
???????????????????
????????????????}
????????????}
???????????? finally
???????????? {
???????????????? // ?Put?clearing?this?flag?in?a?finally?so?we?know?it?will?be?cleared
????????????????reloadingFile? = ? false ;
????????????}
????????}


???????? /// ? <summary>
???????? /// ?Cleanup?the? <see?cref="Timer"/>
???????? /// ? </summary>
???????? private ? void ?ClearTimer()
???????? {
???????????? if ?( null ? != ?timer)
???????????? {
????????????????timer.Tick? -= ?timerTick;
????????????????timer.Dispose();
????????????????timer? = ? null ;
????????????}
????????}

???????? /// ? <summary>
???????? /// ?Cleanup?the? <see?cref="FileSystemWatcher"/>
???????? /// ? </summary>
???????? private ? void ?ClearWatcher()
???????? {
???????????? if ?( null ? != ?watcher)
???????????? {
????????????????FileSystemEventHandler?handler? = ? new ?FileSystemEventHandler(OnChanged);
????????????????watcher.Changed? -= ?handler;
????????????????watcher.Created? -= ?handler;
????????????????watcher.Deleted? -= ?handler;
????????????????watcher.Renamed? -= ?OnRenamed;
????????????????watcher.Dispose();
????????????????watcher? = ? null ;
????????????}
????????}



????}

C#中利用FileSystemWatcher對單個文件內容的監視


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