:C#, VS Deployment and all geek talk

Check out

http://blogs.msdn.com/csharpfaq/archive/2006/03/20/556192.aspx 

for a FAQ on Hashtable lookup for value types.

1 Comment

Many a times, we use the catch block inside the try catch block for our clean up code.

Something like

try

{

 // Do something

}

catch

{

    // work failed, clean up code here
}

Rather than the above approach of using the catch block, it would be nicer to use the finally block, something like

bool workSuccessful = false;

try

{

   // do some work

   workSuccessful = true;

}

finally

{

  if(!workSuccessfull)

  {

    // cleanup code here.

  }

}

There is elegance in the latter method and I would certainly recommend that approach, if you cannot use “using“. See below for details.

PS: Use this approach only if better alternatives are not available. One of the automatic cleanup approaches available with C# is the using construct.

Something like,

using (TextReader tr = new StreamReader(“FileName”))

{

  // do my work here.

}

The “using” construct automatically clean up the unmanaged resource (TextReader) once the block has completed execution.

In the event that you cannot use “using“, the try-finally approach would be the best way.

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Here is a C# code snippet to determine if a particular DLL is registered or not.

[DllImport(“kernel32”)]

public extern static int LoadLibrary(string lpLibFileName);

[DllImport(“kernel32”)]

public extern static bool FreeLibrary(int hLibModule);

public bool IsDllRegistered(string DllName)

{

      int libId = LoadLibrary(DllName);

      if (libId>0) FreeLibrary(libId);

      return (libId>0);

}

Source: http://blogs.msdn.com/asanto

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Want to learn more about Visual Studio 2005.

MSDN magazine folks have come  up with a new issue dedicated solely to the new IDE.

Check it out online at http://msdn.microsoft.com/msdnmag/issues/06/00/default.aspx

2 Comments