How Can I Intercept Method Calls in C# Without External Libraries?

Do not use third-party libraries to intercept method calls in C#

There are several ways to intercept method calls in C# without using an external library, although none of them are simple. Listed below are two options to consider:

1. Inheritance and message reception:

inherits the target class from MarshalByRefObject or ContextBoundObject and defines a property inherited from IMessageSink. Modify this property to intercept method calls and call the appropriate logging method. However, this approach can severely impact performance.

2. Runtime code injection:

Use reflection to inspect classes, retrieve properties, and inject code into existing methods. This requires a deep understanding of reflection and may not be feasible or reliable due to the limitations of Reflection.Emit. Alternatively, you could consider using extensions to the CLR compiler, but this requires expertise that C# developers typically don't have.

Part of the solution modified using the calling method:

If modification of the Caller.Call method is allowed, the solution will be more manageable. By using an interception proxy or creating a new class that implements the same interface as Traced it is possible to intercept method calls and perform the required logging before delegating to the original class. This approach requires some refactoring but avoids the complexity of AOP in C#.

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