Bug 8370 - System.Runtime.Serialization.OnSerializingAttribute does not raise event on Json serialization of object
Summary: System.Runtime.Serialization.OnSerializingAttribute does not raise event on J...
Status: NEW
Alias: None
Product: Class Libraries
Classification: Mono
Component: System ()
Version: unspecified
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2012-11-13 10:06 UTC by Russell
Modified: 2012-11-14 15:57 UTC (History)
1 user (show)

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

source code to demonstrate issue (927 bytes, application/octet-stream)
2012-11-13 10:06 UTC, Russell

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Description Russell 2012-11-13 10:06:40 UTC
Created attachment 2913 [details]
source code to demonstrate issue

Using mono 3.0.1 to serialize an object to JSON. 

Trying to populate additional properties for object that are not set by runtime code. Attached the System.Runtime. Serialization.OnSerializingAttribute to a method of the class being serialize. The method is not called when the object is serialized to JSON using a System.Runtime.Serialization.Json.DatacontractSerializer. 

Attached file has the sample code that demonstrates this issue. When run in Visual Studio on Windows, the resulting output is correct as is:
    {"out_value":"This is a what?","set_on_serialize":"A brick!"}

In MonoDevelop on Mac, I get
    {"out_value":"This is a what?","set_on_serialize":""}

Note that the OnSerializing event in the Cereal class is not being called.
Comment 1 Russell 2012-11-14 15:57:40 UTC
Note that this is fixed with changes mentioned in http://stackoverflow.com/questions/13362906/onserializing-method-not-called-in-mono-3-0-1