My code is like this
public class BaseClass
{
public string Field1 { get; set; }
}
public class DerivedClass: BaseClass
{
public string Field2 { get; set; }
}
var obj = new DerivedClass { Field1 = "aaa", Field2 = "bbb" };
I have to serialize obj
but I only need the BaseClass
properties since DerivedClass
properties are "additional info" which is added after deserialization.
How can I get them? (I can't use [JSonIgnore]
decorator because I have to send DerivedClass
objects over websocket and I'll lose informations)
You may define a custom contract resolver which would filter out all DerivedClass
properties:
public class NoDerivedContractResolver : DefaultContractResolver
{
protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
{
JsonProperty property = base.CreateProperty(member, memberSerialization);
property.ShouldSerialize = _ => property.DeclaringType != typeof(DerivedClass);
return property;
}
}
// .................
var obj = new DerivedClass { Field1 = "aaa", Field2 = "bbb" };
var json = JsonConvert.SerializeObject(obj, new JsonSerializerSettings {
ContractResolver = new NoDerivedContractResolver()
});
Console.WriteLine(json);
// Output:
// {"Field1":"aaa"}
You could provide your BaseClass
with a constructor that takes a BaseClass
as parameter und takes necessary information. This way you could create a new object and serialize it:
public class BaseClass
{
public string Field1 { get; set; }
public BaseClass(){ }
public BaseClass(BaseClass dc)
{
this.Field1 = dc.Field1;
}
}
public class DerivedClass : BaseClass
{
public string Field2 { get; set; }
}
Calling it like this:
var obj = new DerivedClass { Field1 = "aaa", Field2 = "bbb" };
BaseClass obj_base = new BaseClass(obj);
Can't you map a third class that contain all the data to serialise like this:
public class BaseClass
{
public string Field1 { get; set; }
}
public class DerivedClass: BaseClass
{
public string Field2 { get; set; }
}
public class BaseClassDTO{
public string Field1 { get; set; }
public BaseClassDTO(BaseClass baseClass){
this.Field1 = baseClass.Field1;
}
}
Some have propose ( https://github.com/quozd/awesome-dotnet#object-to-object-mapping ). But i fear configuration will be complex for your need.
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