Bug 30667 - Binary serialized Dictionary<> not compatible with .Net
Summary: Binary serialized Dictionary<> not compatible with .Net
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: 4.0.0
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2015-06-02 08:38 UTC by Vladimir
Modified: 2015-06-02 11:20 UTC (History)
2 users (show)

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

Sample util for bug reproducing (1.71 KB, text/plain)
2015-06-02 08:39 UTC, Vladimir

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Description Vladimir 2015-06-02 08:38:23 UTC
Dictionary<> object serialized in mono sometimes can't be deserialized in .Net.

It is because of using custom IEqualityComparers (InternalStringComparer, IntEqualityComparer) for some basic types such as int, string and so on.

This comparers are also serialized during dictionary serialization. So .Net can't deserialize these comparers because there are no such types in .Net assemblies.

It's possible that other generic collections that used EqualityComparers are also can be bugged.

In attachment small sample.
1) Serialize test dictionary:
SerializationBugSample.exe s path_to_output_file

2) Deserialize file as test dictionary:
SerializationBugSample.exe d path_to_input_file

So steps to reproduce:
1) On Linux: 
mono SerializationBugSample.exe s out.bin

2) Copy out.bin to Windows machine

3) On Windows: 
SerializationBugSample.exe d out.bin
Comment 1 Vladimir 2015-06-02 08:39:24 UTC
Created attachment 11424 [details]
Sample util for bug reproducing
Comment 2 Marek Safar 2015-06-02 10:55:17 UTC
Fixed in master and Mono 4.2
Comment 3 Vladimir 2015-06-02 11:00:34 UTC
If it's possible, can you tell in which commit this fix has been made?
Comment 5 Vladimir 2015-06-02 11:20:28 UTC
Thanks a lot! I just want to understand if it's possible to create patch for my version.