CODEWITHSUNDEEP
c#servicestack
Erhan A
Erhan A

Reputation: 701

How to avoid child class properties serialized as json in servicestack

Let's say I have 3 classes.

public Class1{
public string field1{get;set;}
}

public Class2:Class1 {
public string field2{get;set;} 
}

public Class3:Class2 {
public string field3{get;set;} 
}


Class3 obj3 = new Class3();
Class2 obj2 = obj3;

Class1 obj1 = obj2;

public class MyInfoService : ServiceBase<MyReuest>
{
      protected override object Run(MyReuest request)
        {
           Class3 obj3= FindObjClass3("someid");
           Class2 obj2 = DoSomethingObj3Class3(obj3);
           Class1 obj1= obj2; // service users have to get only Class1 fields 
           return obj1;

        }
}

The problem starts when I want to return obj1 as response with format=json , the output json contains properties from obj2 and obj3.

I just want that obj1 is serialized as response only with its properties.

Is there a way to do this ?

Upvotes: 2

Views: 1470

Answers (2)

mythz
mythz

Reputation: 143319

Don't try and abuse inheritance, they're bad practice for DTOs: Getting ServiceStack to retain type information

It's also a bad idea to use inheritance to DRY properties - these unnecessary abstractions should be avoided. Automatic properties are a terse way to express the structural fields of your type. Use interfaces instead, when you need them: http://ayende.com/blog/4769/code-review-guidelines-avoid-inheritance-for-properties

Upvotes: 2

Pavel Bakshy
Pavel Bakshy

Reputation: 7747

If you can't touch serialization level, the try to Clone object before return.

public class Class1 : ICloneable {
    public string Prop1 { get; set; }

    public object Clone() {
        return new Class1 { Prop1 = Prop1 };
    }
}

public class Class2 : Class1 {
    public string Prop2 { get; set; }

    public new object Clone() {
        return new Class2 { Prop1 = Prop1, Prop2 = Prop2 };
    }
}

Then use use:

public class MyInfoService : ServiceBase<MyReuest>
{
    protected override object Run(MyReuest request)
    {
       Class3 obj3 = FindObjClass3("someid");
       Class2 obj2 = DoSomethingObj3Class3(obj3); 
       return ((Class1) obj2).Clone();
    }
}

NOTE: For different implementations of Clone method depending on type use new keyword instead of override

Upvotes: 1

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