How to Map Nested JSON Properties to Simple C# Properties?

The simple attribute that maps the json sub -attribute to the C# object

Introduction

Create a customized back -sequentialized behavior in Newtonsoft.json can be achieved by custom attributes and converters. This allows you to map the sub -attributes of the JSON object to the simple attributes of the C# class, even if they do not have the corresponding object.

Use the auxiliary method

If you only need an additional attribute, a simple method is to resolve your JSON as jobject, fill your class with ToObject (), and then use selecttoken () to extract the additional attributes. For example:

Create a custom JSONCONVERter

<code class="language-csharp">string json = @"
{
    ""name"" : ""Joe Shmoe"",
    ""age"" : 26,
    ""picture"":
    {
        ""id"": 123456,
        ""data"":
        {
            ""type"": ""jpg"",
            ""url"": ""http://www.someplace.com/mypicture.jpg""
        }
    }
}";

JObject jo = JObject.Parse(json);
Person p = jo.ToObject<Person>();
p.ProfilePicture = (string)jo.SelectToken("picture.data.url");</code>

For more complicated solutions, you can create a custom JSONCONVERter that uses the above technology to process all attributes marked with JSONPROPERTY attributes. JSONCONVER can use reflection to find attributes, map them to the correct JSON path, and fill the attributes accordingly.

The associated custom converter

<code class="language-csharp">class JsonPathConverter : JsonConverter
{
    // ReadJson 实现在此处...
}</code>

Use the [JSONCONVERTER] property to associate the converter to the target class. You can then apply the [JSONPROPERTY] property to the required attributes and specify the JSON path as the attribute name.

After using these attributes, you can derive JSON as usual, and the mapping will occur automatically.

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