[Mono-bugs] [Bug 328036] [PATCH]Casting bug with generic collections

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https://bugzilla.novell.com/show_bug.cgi?id=328036

User mono at e-tobi.net added comment
https://bugzilla.novell.com/show_bug.cgi?id=328036#c12


Tobias Grimm <mono at e-tobi.net> changed:

           What    |Removed                                         |Added
----------------------------------------------------------------------------
                 CC|                                                |mono at e-tobi.net
           Severity|Normal                                          |Major




--- Comment #12 from Tobias Grimm <mono at e-tobi.net>  2008-09-08 22:39:31 MDT ---
I'm raising severity to Major - this bug still exists in the current SVN
version after nearly a year. KeyCollection seems to have been fixed, but
ValueCollection doesn't (see below), which is a major show stopper.

I've also attached my solution to this problem, which is slightly different.

Tobias


Dictionary<string, string> genericDictionary = new Dictionary<string,
string>();
genericDictionary["a"] = "x";

object[] simpleObjectArray = new object[genericDictionary.Values.Count];

// This works:
(genericDictionary.Keys as ICollection).CopyTo(simpleObjectArray, 0);

// This fails:
(genercDictionary.Values as ICollection).CopyTo(simpleObjectArray, 0);


Unhandled Exception: System.InvalidCastException: Cannot cast from source type
to destination type.
  at (wrapper managed-to-native) object:__icall_wrapper_mono_object_castclass
(object,intptr)
  at
System.Collections.Generic.Dictionary`2+ValueCollection[System.Object,System.Object].System.Collections.ICollection.CopyTo
(System.Array array, Int32 index) [0x00000] 
  at MainClass.Main () [0x00034] in /tmp/--/test.cs:15 


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