如何告诉 Json.NET 忽略第 3 方对象中的属性?

问题描述

Json.NET 文档说您使用 JsonIgnore 来不序列化类中的某些属性:

The Json.NET documentation says you use JsonIgnore to not serialize certain properties in your classes:

public class Account
{
    public string FullName { get; set; }
    public string EmailAddress { get; set; }

    [JsonIgnore]
    public string PasswordHash { get; set; }
}

如何让 Json.NET 在使用 JsonConvert.SerializeObject 序列化第 3 方对象时忽略特定属性?

How can I make Json.NET ignore specific properties when serializing a 3rd-party object with JsonConvert.SerializeObject?

推荐答案

制作自定义合约解析器:

Make a custom contract resolver:

public class ShouldSerializeContractResolver : DefaultContractResolver
{
    public static ShouldSerializeContractResolver Instance { get; } = new ShouldSerializeContractResolver();

    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
    {
        JsonProperty property = base.CreateProperty(member, memberSerialization);        
        if (typeof(Account).IsAssignableFrom(member.DeclaringType) && member.Name == nameof(Account.PasswordHash))
        {
            property.Ignored = true;
        }
        return property;
    }
}

我如何测试它:

        var account = new Account
        {
            PasswordHash = "XXAABB"
        };
        var settings = new JsonSerializerSettings
        {
            ContractResolver = ShouldSerializeContractResolver.Instance
        };
        var json = JsonConvert.SerializeObject(account, settings);
        Console.WriteLine(json);

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