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Customizing Json.NET serialization: turning object into array to avoid repetition of property names

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半阙折子戏
半阙折子戏 2020-12-30 00:11

I\'m sending large amounts of different JSON graphs from a server to a client (I control both) and they all contain a pathological case: a large array of homogeneous (same t

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  • 青春惊慌失措
    青春惊慌失措 (楼主)
    2020-12-30 00:39

    No need for custom JSON converters. Just make your class implement IEnumerable. Json.NET will then serialize your data as an array instead of an object.

    For instance, instead of...

    // will be serialized as: {"Key1":87,"Key2":99}
public class Foo
{
    public string Key1;
    public string Key2;
}

    ...write this:

    // will be serialized as: [87,99]
public class Foo : IEnumerable
{
    public string Key1;
    public string Key2;

    IEnumerator IEnumerable.GetEnumerator() => EnumerateFields().GetEnumerator();
    IEnumerator IEnumerable.GetEnumerator() => EnumerateFields().GetEnumerator();
    IEnumerable EnumerateFields()
    {
        yield return Key1;
        yield return Key2;
    }
}



    If you need to apply this strategy to many classes then you can declare an abstract base class to get rid of some of the boilerplate:
    


    // Base class for objects to be serialized as "[...]" instead of "{...}"
public abstract class SerializedAsArray : IEnumerable
{
    IEnumerator IEnumerable.GetEnumerator() =>
        EnumerateFields().GetEnumerator();
    IEnumerator IEnumerable.GetEnumerator() =>
        EnumerateFields().GetEnumerator();
    protected abstract IEnumerable EnumerateFields();
}

// will be serialized as: [87,99]
public class Foo : SerializedAsArray
{
    public string Key1;
    public string Key2;

    protected override IEnumerable EnumerateFields()
    {
        yield return Key1;
        yield return Key2;
    }
}

    
    
             
    
                                                        
    
            
            
    
              
                
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