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

Serialization using Json.Net exclude attributes

When serializing objects using Json.Net, some properties may be required when deserializing but not when serializing. This article explores several ways to implement this scenario:

Method 1: Conditional serialization

Json.Net supports the ShouldSerialize method, which can conditionally control serialization. Define the ShouldSerialize method for the required properties and set it to return false:

<code class="language-csharp">class Config
{
    public Fizz ObsoleteSetting { get; set; }

    public bool ShouldSerializeObsoleteSetting()
    {
        return false;
    }
}</code>

Method 2: Use JObject to operate JSON

After deserializing the object to JObject, manually remove the properties before serializing:

<code class="language-csharp">JObject jo = JObject.FromObject(config);
jo["ObsoleteSetting"].Parent.Remove();
string json = jo.ToString();</code>

Method 3: Use attributes

a. Ignore properties using private setters

Use the [JsonIgnore] attribute to exclude attributes for serialization. Use [JsonProperty] to apply to alternate private property setters:

<code class="language-csharp">class Config
{
    [JsonIgnore]
    public Fizz ObsoleteSetting { get; set; }

    [JsonProperty("ObsoleteSetting")]
    private Fizz ObsoleteSettingAlternateSetter
    {
        set { ObsoleteSetting = value; }
    }
}</code>

b. Use public setters to ignore properties

Alternatively, use a public property setter with [JsonProperty] and exclude its getter using [JsonIgnore]:

<code class="language-csharp">class Config
{
    [JsonProperty("ObsoleteSetting")]
    public Fizz ObsoleteSetting { set; private get; }
}</code>

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