How Can I Exclude Properties from JSON Serialization with Json.Net?

How to exclude attributes from JSON serialization using Json.Net

When serializing DTO objects using Json.Net, it is often necessary to exclude certain attributes. Even if the property is public and required elsewhere in the application, excluding it from serialization can optimize data transfer and reduce the serialized JSON size.

Use the [JsonIgnore] feature

A straightforward way is to use the [JsonIgnore] attribute. By annotating a required property with this attribute, you can prevent it from being included in the serialized JSON output. For example:

<code class="language-csharp">public class Car
{
    [JsonIgnore]
    public DateTime LastModified { get; set; }
}</code>

In this example, the LastModified attribute will be excluded from the serialized JSON representation of the Car class.

Using the DataContract and DataMember attributes

Alternatively, you can take advantage of the DataContract and DataMember features. You can selectively control which properties are serialized by applying [DataContract] to the class and [DataMember] to the properties to be included. For example:

<code class="language-csharp">[DataContract]
public class Computer
{
    [DataMember]
    public string Name { get; set; }

    [DataMember]
    public decimal SalePrice { get; set; }
}</code>

Properties not annotated with [DataMember] will be omitted from the serialized JSON.

Please refer to the Json.Net documentation for more comprehensive information on these technologies.

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