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[release/5.0-preview3] Cache parameterized ctor delegates in class info rather than converter - #34353
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dotnet#34248) * Cache parameterized ctor delegates in class info rather than converter * Address review feedback - move delegate assignment to start of deserialization * Address review feedback - nullability
ericstj
approved these changes
Apr 3, 2020
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Description
Ports #34248 to preview 3.
Fixes#33928 in preview 3.
A
JsonSerializerfeature that enables the deserialization of POCOs using parameterized ctors was recently checked in - #33444.CI caught an issue where
JsonSerializerleaks a null ref in some cases where deserialization of objects using parameterized ctors is occurring on multiple threads: #33928. This PR fixes the issue.Customer Impact
Prevents a null ref in multi-threaded deserialization scenarios. Users are likely to hit this when deserializing objects using parameterized ctors on mutliple threads. This proactively fixes the issue.
Regression?
This feature is shipping for the first time in this preview.
Risk
Tests have been added for this scenario.