Method Interception : "Common Language Runtime detected an invalid program."

[rainynovember12]

The exception occurs while executing the example Interception (MethodReplacement) program

public class SampleInterceptor : IInterceptor
{
public object Intercept(IInvocationInfo info)
{
var methodName = info.TargetMethod.Name;
Console.WriteLine("method '{0}' called", methodName);
object retValue = info.TargetMethod.Invoke(info.Target, info.Arguments); //Throws Exception : "Common Language Runtime detected an invalid program"
return retValue; //retValue is always null
}
}

[philiplaureano]

I just updated the samples now with the latest LinFu binaries. Try it out and let me know if it works for you.

[rainynovember12]

Well, now the following exception is being shown.

"JIT Compiler encountered an internal limitation."

Please note that this exception is being thrown from within the following method (class BankAccount):

public void Deposit(int amount)
{
_balance += amount;

        Console.WriteLine("Deposited: {0}", amount);
        Console.WriteLine("New Balance: {0}", Balance);

}

So, if I comment the above method call (Deposit()) within the Pay() method, the program works:

public void Pay(int wage)
{
var currentAmount = wage;
//_checkingAccount.Deposit(currentAmount);

        Console.WriteLine("Paid {0} units", wage);

}

However, my intention is to intercept all the methods and get return value correctly from within the target methods. For example:

Let's change the Pay() method to return an int

public int Pay(int wage)
{
var currentAmount = wage;
//_checkingAccount.Deposit(currentAmount);

        Console.WriteLine("Paid {0} units", wage);
        return wage;

}

And, Intercept the method call and also get the return value correctly from within the intercepted method as follows:

public object Intercept(IInvocationInfo info)
{
var methodName = info.TargetMethod.Name;
Console.WriteLine("method '{0}' called", methodName);

        // Replace the input parameter with 42
        var result = info.TargetMethod.Invoke(info.Target, new object[]{42});
        //Get the return value correctly from the target method. 
        return result;

}

Right now, the program throws the mentioned exception and hence not able to return correct value.

Thanks in advance for your effort.

[rainynovember12]

Using a reflector, I took a look at the Weaven Pay() method, after modifying the Pay() as returning an int. There I found the following codes, alsong with the injected codes
...
int amount = wage;
this._checkingAccount.Deposit(amount);
Console.WriteLine("Paid {0} units", wage);
int num2 = wage;
....

return (int) obj2;

//Please note that, the obj2 is never assigned with a value and hence, the postweaven methods always return null. This may give you some clue.

Thanks