Fix InvalidCastException when casting a polymorphic converter #73259
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Tagging subscribers to this area: @dotnet/area-system-text-json, @gregsdennis Issue DetailsHas been largely fixed thanks to the infrastructural changes in #70435 and #72789. This adds a fix for the case of dictionary converters that was missed out and includes a regression test for the original bug report. Fix #46522.
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I've expanded the scope of this PR somewhat, incorporating equivalent fixes & testing for the serialization case. The PR also includes a few additional changes, tidying up logic around the casting converter and ensuring we never layer multiple casting converters on top of each other. |
eiriktsarpalis
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src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfoOfT.cs
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layomia
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...libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/CastingConverter.cs
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src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonConverterOfT.cs
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Has been largely fixed thanks to the infrastructural changes in #70435 and #72789. This adds a fix for the case of dictionary converters that was missed out and includes a regression test for the original bug report.
Fix #46522.