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Скачать или смотреть How to Json Serialize Ignoring Properties When Not Assigned a Value Yet Including Null Values

  • vlogize
  • 2025-09-18
  • 1
How to Json Serialize Ignoring Properties When Not Assigned a Value Yet Including Null Values
Json Serialize ignore properties when not assigning value but property should be present when assignc#jsonserializationjson.net
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Описание к видео How to Json Serialize Ignoring Properties When Not Assigned a Value Yet Including Null Values

Learn how to customize JSON serialization in C# using Newtonsoft.Json to ignore properties that are not set, while still including properties with null values.
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This video is based on the question https://stackoverflow.com/q/62403864/ asked by the user 'surya teja' ( https://stackoverflow.com/u/8224251/ ) and on the answer https://stackoverflow.com/a/62410249/ provided by the user 'Abdulrazzaq Alzayed' ( https://stackoverflow.com/u/1581959/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Json Serialize ignore properties when not assigning value but property should be present when assign null

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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Understanding the Serialization Challenge in C#

When working with JSON serialization in C# , especially using the popular Newtonsoft.Json library, you may encounter a situation where you want to control the output of your serialized objects. Specifically, you might want to exclude properties from the JSON output if they are not assigned any value, but you want to ensure that properties assigned a null value are still included. This requirement can lead to confusion if the default serializers don't meet your needs.

The Problem: What Do We Want?

Imagine you have a class, Car, structured as follows:

[[See Video to Reveal this Text or Code Snippet]]

Use Cases:

If a property is set to null (e.g., Model), we want to include it in the JSON output:

[[See Video to Reveal this Text or Code Snippet]]

If a property is not assigned any value, it should be omitted:

[[See Video to Reveal this Text or Code Snippet]]

Achieving this with the default serialization settings can be tricky.

The Solution: Creating a Custom Contract Resolver

To meet the requirement mentioned above, you need to create a custom contract resolver that allows for this selective serialization. Here's a step-by-step guide to implement this solution.

Step 1: Modify Your Car Class

First, ensure your Car class initializes properties to an identifiable default value. Here’s how you might set up your class:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Create a Custom Contract Resolver

Next, you need to create your own ShouldSerializeContractResolver. This class will determine how properties should be serialized based on their values.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Instantiate Your Car Object

Now, let's create an instance of Car:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Serialize the Object

Use the custom contract resolver while serializing your object:

[[See Video to Reveal this Text or Code Snippet]]

Step 5: Output the Result

Finally, to see the result of your serialization, you can print it out:

[[See Video to Reveal this Text or Code Snippet]]

The Final Output

When you run the above code, you should get an output like this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you can effectively control how your objects are serialized into JSON. The custom contract resolver helps you specify conditions for each property, allowing for increased flexibility in your application’s data handling. This way, you can ensure that all necessary properties are accounted for, regardless of whether they have been explicitly assigned values or not.

By understanding and implementing these concepts, you can enhance your C# applications by having precise control over JSON serialization. Happy coding!

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