Unable to deserialize JSON in some cases

[torbacz]

Library/API/IoT binding

nanoFramework.Json

Visual Studio version

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.NET nanoFramework extension version

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Target name(s)

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Firmware version

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Device capabilities

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Description

Examples (we faced this kind of issues in our project and we had to fork nanoframework.Json):

• DateTime - by default nanoFramework.Json requires milliseconds in json date time to successfully convert it into DateTime object. By default .net6 API is returning DateTime without milliseconds .
• Deserialize JSON value based on other JSON field (one field has value for object, second type of object to create). In fact deserialization of object mapped to interfaces.

This kind of issues can be resolved via converters in NET6: https://docs.microsoft.com/en-us/dotnet/standard/serialization/system-text-json-converters-how-to?pivots=dotnet-6-0

Solution in nano:

• Create base class for converters (read/write methods)
• Create static Hashtable to store all converters
• Create few methods for adding/replacing converters from outside of nanoFramework.Json
• Call the converter code if the type is mapped

After the converted feature will be confirmed to work - replace current code:

if (rootElementType == null
    && rootType.FullName == "System.Collections.Hashtable")

rootElementType == null
   && rootType.FullName == "System.Collections.ArrayList"

with converters. This will result in much cleaner code and being able to test converters logic separately.

How to reproduce

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Expected behaviour

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Screenshots

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Sample project or code

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Aditional information

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