can it be that you are looking for System.Diagnostics.SymbolStore.ISymbolScope.
Have a look at the class SymbolAccess, you can use it to gain access to ISymbolScope.GetLocals() that returns ISymbolVariable[] and GetChildren() again returning in this time an array called ISymbolVariable[]
Now another interesting set of reference code samples is the Debugger extension lets you “snif” the values as shown here