[Mono-list] System.Collections intricacies

[Andrew P. Wilson]

Hello everyone:   I was hoping someone would be able to help me out with some details about indexers and collections and how they are used in mono.   I was trying to implement some functionality to the ArrayList class in System.Collections through the use of the ArrayLists indexers.   I had thought that if you wrote the code snippet the ArrayList’s indexer function would be invoked 100 times because of the second for loop:   /////////////// begin ArrayList myAL; myAL = new ArrayList();   for(int i=0; i<100; i++) myAL.Add(i); //(add a bunch of numbers to the array list)   int sum = 0; for(int i=0; i<100; i++)             sum = sum + (int)myAL[i]; /////////////// end     However, I am finding that the indexer is not called at all and from disassembling the executable, the following instructions are occurring where I would have thought the indexer would have been called: . .           IL_0099:  callvirt instance object class [mscorlib]'System.Collections.ArrayList'::'get_Item'(int32) IL_009e:  unbox [mscorlib]System.Int32 . .   Normally, this wouldn’t be a problem for me.  However, I cannot find this “get_Item” function anywhere in the mcs or mono source code.  There is also a corresponding “set_Item” function that is called as well, but again, I cannot find it in the source code.   Is there a situation where the ArrayList Indexer will be called?  And do the get_Item and set_Item functions exist somewhere in the source code?   Basically, all I want to be able to do is monitor accesses to an ArrayList through some predefined interface, whether the indexer or these get_Item and set_Item functions.  Any information about any of these things would be much appreciated.   Thank you for your time,   Andrew P. Wilson Electrical and Computer Engineering Department University of Toronto