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POHow to prevent a method of a class to be called before the class is ready?
 

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  1. POHow to prevent a method of a class to be called before the class is ready?
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    <p>Still exploring C# ... so bare with me please.</p> <p>Here is my custom "logger" class, which helps me create logs file in my project.</p> <pre><code>namespace MyProject { class Logger { private FileInfo fFile; private DirectoryInfo dDir; /// &lt;summary&gt;Add a new entry to the log file.&lt;/summary&gt; /// &lt;param name="sData"&gt;The line to add.&lt;/param&gt; public void Add(string sData) { DateTime CurrTime = DateTime.Now; if (fFile.Length &gt; 1048576) { fFile.MoveTo(Path.Combine(dDir.FullName, CurrTime.ToShortDateString() + fFile.Name)); fFile = new FileInfo(Path.Combine(dDir.FullName,fFile.Name)); using (StreamWriter sw = fFile.CreateText()) { sw.WriteLine("{0:u}|{1}", CurrTime, sData); } } else { using (StreamWriter sw = fFile.AppendText()) { sw.WriteLine("{0:u}|{1}", CurrTime, sData); } } } /// &lt;summary&gt;Logger instance&lt;/summary&gt; /// &lt;param name="sFile"&gt;Full name of the file to use as logs. Ex : "MyLogs.txt"&lt;/param&gt; public Logger(string sFile) { dDir = new DirectoryInfo(Path.Combine(MyProject.AppPath, "logs")); if (!dDir.Exists) { dDir.Create(); } fFile = new FileInfo(Path.Combine(dDir.FullName,sFile)); if (!fFile.Exists) { using (StreamWriter sw = fFile.CreateText()) { sw.WriteLine("{0:u}|Logger Started", DateTime.Now); } } else { Add("Logger Started"); } } } } </code></pre> <p>The problem I have with this code is, apparently, sometimes, Logger.Add is called before the new instance of that logger had time to create the file. So my program crashes saying "file not found", although, the file ends up being created in the end, and if I restart my program using the same filename for the logs, everything works fine (because the file exists now ...)</p> <p>Instead of just making sure logger.add is not called before the file is created, is there a way to "lock" the class ?</p> <p>I've tried the lock method but it didn't work ... Lock(this) didn't do anything, and I can't use it on the method itself.</p>
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      1. POHow to prevent a method of a class to be called before the class is ready?
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    1. COcan you try `if file.exists` and if it doesn't exist, run `system.threadding.threadding.sleep(10)` and try again. It's a bit of a hack, but it will basically make your application "wait" before executing the add method.
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      1. USChase Florell
    2. CO@rockinthesixstring - This would work as the code needs to still create the file before the second thread calls the method. If both threads sleep for 10 milliseconds they could still collide.
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    3. COThis is completely out of left field, but it may be worth looking at Log4Net to see how the do logging. Use the wheels that are out there instead of re-inventing them ;-). Of course, this is under the assumption that you haven't already tried this. Please disregard this comment and accept my apologies if that assumption is incorrect.
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