How do i create my custom lock statement in c#?

Question

I want to create my custom statements for the c# compiler to generate a try finally block. Just like the lock statement.

Forexample

private readonly ReaderWriterLockSlim _lockObject

private void MyMethod()
{
   MyWriteLock(lockObject)
   {

   }
}

private void MyMethod2()
{
   MyReadLock(lockObject)
   {

   }
}

Compiler should generate following code for me

private void MyMethod()
{
   try
   {
     lockObject.EnterWriteLock();
     .. statetments for the method    
   }
   finally 
   {
     _lockObject.ExitWriteLock();
   }
}

private void MyMethod2()
{
   try
   {
     lockObject.EnterReadLock();
     .. statetments for the method    
   }
   finally 
   {
     _lockObject.ExitReadLock();
   }
}

Answer 1

You can't create your own statements in C#. The closest you can come for try/finally is a using statement:

using (lockObject.AcquireReadToken())
{
}

where AcquireReadToken() would acquire a read lock, and return an IDisposable which releases the lock when it's disposed.

Answer 2

You should give a try to ILWeaving . I haven't tried that, but a lot of 'magic' can be done using ILWeaving. I use NotifyPropertyWeaver which uses ILWeaving to inject code.

NotifyPropertyWeaver

Refer this question

What is IL Weaving?

Answer 3

You could do this with ILWeaving using one of the following

• Postsharp http://www.sharpcrafters.com/
• Fody http://code.google.com/p/fody/
• Raw Cecil http://www.mono-project.com/Cecil

However I think in this case making use of a 'using' statement as suggested by @JonSkeet would be the much simpler solution.

That is, of course, unless you are interested in learning about IL Manipulation. In which case go for it :)