Not sure to fully understand the question, but you cannot access the parameters on the stack from a normal program. Runtime metadata is only about static information (method, properties, constants, etc...).

I believe only a debugger (which is considered as a special beast of its own) can do this without changing the program/source, and this has serious performance cost. As a side note, here is a link that explain how to build your own managed debugger (.NET 4): CLR Managed Debugger (mdbg) Sample 4.0

Another solution is to instrument your code (automatically or using a tool) to add some tracing call that can capture the list of parameters on each traced methods. Tools like PostSharp can do this. Here is another link: Non-Invasive Tracing & Logging