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Asked: 2026-05-29T10:05:19+00:00

I’m developing a desktop application with .NET. I’d like to save some data into

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I’m developing a desktop application with .NET. I’d like to save some data into a file in a way that would later give me some degree of freedom in changing the data I’m saving, such as adding new fields, while retaining the possibility to read saves from older formats.

This answer recommends to use DataContractSerializer instead of BinaryFormatter.

However I can’t use the [DataContract] attribute on my classes in the project. After using System.Runtime.Serialization; I still get errors about unknown types.

The project targets .NET Framework 4.

I’ve learned that Data Contracts are part of the WCF framework, I assume I should somehow configure my project to use it. How?

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  1. Editorial Team

    In C# namespaces can be shared across multiple assemblies. You have to add a reference to System.Runtime.Serialization.dll, which contains [DataContract] attribute.

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