How can I exclude properties from JSON serialization using custom logic in System.Text.Json without using attribute?

Question

I have an object that contains a Func property:

public class Foo {
   public Func<int> DoCalculation {get;init;}
   public string Bar {get;init;}
}

How can I exclude all Func<...> properties in any JSON serialization without using [JsonIgnore] or any other attribute?

Context:

Youb can consider [`[DataMember]`](https://learn.microsoft.com/en-us/aspnet/web-api/overview/formats-and-model-binding/json-and-xml-serialization#what-gets-serialized) However, it depends on your scenario and requirement because you are `using Func` deligate within your class. Thus, need to know more details what exactly you are trying to achieve. — Md Farid Uddin Kiron, Mar 02 '23 at 06:23
@MdFaridUddinKiron, I'm looking for a solution without using an attribute of any kind. — THX-1138, Mar 03 '23 at 13:44
Take a look at [System.Text.Json API is there something like IContractResolver](https://stackoverflow.com/q/58926112). In .NET 7 you will be able to use a [TypeInfo modifier](https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/custom-contracts#modifiers) to exclude properties by type. But in .NET 6 this is not available so you will need to write a custom converter or use a 3rd party library like Dahomey.Json. In fact I'd say your question is a duplicate of that one, agree? — dbc, Mar 25 '23 at 19:26

0 Answers0