How Can I Intercept C# Method Calls Without Using External Libraries or Modifying the Original Class?

Native C# Method Call Interception: Challenges and Approaches

Monitoring method execution and logging parameters is crucial for debugging and analysis. However, achieving this in C# without external libraries or altering the original class presents significant limitations.

Constraints and Inapplicable Techniques:

Since modifying the calling code or the target class is prohibited, several common solutions are ruled out:

• AOP Frameworks: These simplify interception, but are explicitly excluded.
• Direct Class Modification: Adding logging directly to the Traced class methods violates the requirement to preserve the original API.

Exploring Less Ideal Options:

While possible, the following methods come with significant drawbacks:

• Method Invocation Handlers: Using MarshalByRefObject, ContextBoundObject, and IMessageSink allows interception, but introduces considerable performance overhead.

• Runtime Code Injection (Reflection): Dynamically altering the Traced class's methods via reflection is complex, error-prone, and potentially unstable.

Practical Alternatives (Allowing Minor Modifications):

If minor changes to the Call method's usage are acceptable, these options are more viable:

• Wrapper Class: Create a wrapper class that encapsulates the Traced class, handling method calls and incorporating logging within the wrapper methods. This keeps the original class untouched.

• Inversion of Control (IoC): An IoC container can manage dependencies and provide a central point for intercepting and logging method calls. This approach requires integrating the IoC framework, but it's generally cleaner and more maintainable than direct code injection.

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