Bug 17677 - Can't compare byte array using Comparer
Summary: Can't compare byte array using Comparer
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: unspecified
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Marek Safar
Depends on:
Reported: 2014-02-10 03:27 UTC by Ryoji.Ishikawa
Modified: 2014-02-13 17:47 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Ryoji.Ishikawa 2014-02-10 03:27:39 UTC
Though the following sample code work in .NET v4.5, in Xamarin.iOS it has an exception.
I'm using,
 Xamarin.iOS: Edition)
 Xcode: 5.0.2(3335.32)
 Xamarin Studio: 4.2.2(build2)

using System;
using System.Collections.Generic;

byte[] v1 = new byte[]{0,1};
byte[] v2 = new byte[]{2,3};

int ret = Comparer<object>.Default.Compare(v1, v2);  // does not implement right interface

Is it bug?
Comment 1 Rolf Bjarne Kvinge [MSFT] 2014-02-10 09:33:12 UTC
This fails using the desktop mono too:

$ csharp
csharp> using System;
csharp> using System.Collections.Generic;
csharp> byte[] v1 = new byte[]{0,1};
csharp> byte[] v2 = new byte[]{2,3};
csharp> int ret = Comparer<object>.Default.Compare(v1, v2);
System.ArgumentException: does not implement right interface
  at System.Collections.Generic.Comparer`1+DefaultComparer[System.Object].Compare (System.Object x, System.Object y) [0x00000] in <filename unknown>:0 
  at <InteractiveExpressionClass>.Host (System.Object& $retval) [0x00000] in <filename unknown>:0 
  at Mono.CSharp.Evaluator.Evaluate (System.String input, System.Object& result, System.Boolean& result_set) [0x00000] in <filename unknown>:0 
  at Mono.CSharpShell.Evaluate (System.String input) [0x00000] in <filename unknown>:0 
Comment 2 Marek Safar 2014-02-10 09:46:38 UTC
Attached code fails on .NET 4.5 with same exception
Comment 3 Ryoji.Ishikawa 2014-02-11 20:15:01 UTC
I have updated sample code.

using System;
using System.Collections.Generic;

byte[] v1 = new byte[]{0,1};

int ret = Comparer<object>.Default.Compare(v1, v1);  // does not implement
right interface
Comment 4 Marek Safar 2014-02-12 02:32:16 UTC
This case works with mono master as well (fixed last week)