[Mono-bugs] [Bug 77304][Min] New - Unnecessary exception in ArrayList

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Changed by n.h.m.aandebrugh at student.utwente.nl.

http://bugzilla.ximian.com/show_bug.cgi?id=77304

--- shadow/77304	2006-01-19 10:02:58.000000000 -0500
+++ shadow/77304.tmp.31582	2006-01-19 10:02:58.000000000 -0500
@@ -0,0 +1,40 @@
+Bug#: 77304
+Product: Mono: Class Libraries
+Version: 1.1
+OS: 
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Minor
+Component: CORLIB
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: n.h.m.aandebrugh at student.utwente.nl               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: Unnecessary exception in ArrayList
+
+Description of Problem:  
+Assigning a value to an element in an ArrayList using the indexer raises 
+an exception. This is nice and all, but only if its really an error.  
+The check in the setter should be made against "_items.Length" (i.e. the 
+Capacity) not "_size" (i.e. the Count). With this implementation it's 
+impossible to have "gaps" in the array.  
+Forcing all elements to have some value could be a (imo no so good) design 
+decision, but there is no check when assigning the default value null to 
+an element, as long as its offset is <= count. 
+ 
+Steps to reproduce the problem: 
+1. IList aap = new ArrayList(); // default cap. is 16 for my version 
+2. aap[0] = whatever 
+ 
+Actual Results: 
+ArgumentOutOfRangeException 
+ 
+Expected Results: 
+Perfectly legal, as long as index >= 0 && index < _items.Length 
+ 
+How often does this happen?  
+Every time.