How Can I Deserialize Interface Properties in JSON.NET Without Errors?

Handling Interface Properties During JSON Deserialization with JSON.NET

JSON.NET's deserialization process can be problematic when encountering interface properties. Direct deserialization of objects containing interface properties results in an error because JSON.NET cannot directly instantiate interfaces.

Resolution: Constructor Injection for Seamless Deserialization

A simple and effective solution is to leverage constructor injection. By incorporating concrete class instances as constructor parameters within the class implementing the interface, JSON.NET can correctly identify and utilize the appropriate concrete classes during deserialization.

Illustrative Example:

Let's examine a class featuring an interface property:

<code class="language-csharp">public class Visit : IVisit
{
    public Visit(MyLocation location, Guest guest)
    {
        Location = location;
        Guest = guest;
    }

    public long VisitId { get; set; }
    public ILocation Location { get; set; }
    public DateTime VisitDate { get; set; }
    public IGuest Guest { get; set; }
}</code>

This constructor-based approach enables JSON.NET to accurately deserialize the JSON data into the necessary concrete classes, thereby resolving the issue with interface properties.

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