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Editorial Team
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Asked: 2026-05-14T23:27:11+00:00

I have some services at the moment that return a dto with the following

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I have some services at the moment that return a dto with the following fields:

[DataMember]
public int Id { get; set; }
[DataMember]
public string Name { get; set; }

and I want to add more to this service by adding the following properties:

[DataMember]
public virtual DateTime StartDate { get; set; }

I’m not in a position where i can update the consumers of these services though – the client does that themselves.

My question is – will the old clients be able to just skip these new properties? and the new ones take advantage of them or will the serialization be an issue with the new properties?

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1 Answer

  1. Editorial Team

    As long as the old properties do not change (and the new one is marked as optional) you should be alright.

    Said so, you should publish the new contract and get the clients to regenerate the service reference – or deploy the new version to a different endpoint so that when they’re ready to switch they are forced to point to the new one.

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