如何使用Json（C＃）序列化对象而忽略某些属性

Question

This should be easy, but after a day of experiments I more confused. This would be so useful in test scenarios Basically I want to easily compare a object created in a test against a what I would expect, but ignoring insignificant properties. The object is The WPF App and I am refactoring the crucial initialization code, so The scenario would be:

• I want to make a Json copy of the object initialized in the old way (without any unimportant properties) as a json string and saved to a "gold" file
• Run The Test - initialising the object the new way
• Serialise the new object to json string - and to file without the unimportant properties

• Load the gold file -> string

• Compare the two strings

• voila

Essentially a dictionary of top level important properties (nae - values as a string) is what I want. I am not interested in hierarchical complexity as I can do that in the code if I need. Keeping it simple ... There are many Json nugets out there and the filtering is "hidden" in the JSon encapsulation. This is such a useful idea for unit testing, but I am struggling to get a (simple) way to do this. I don't wan't to use attributes in main class - as this is just for a specific test.

I have looked at many posts and tried various ideas, but it aint getting there. Please help if you can thanks

Terry

Answer 1

You can do this by using newtonsoft Json.net : https://www.newtonsoft.com/json/help/html/SerializationAttributes.htm

You just have to not set the JsonPropertyAttribute

[JsonObject(MemberSerialization.OptIn)]
public class Person
{
    // "John Smith"
    [JsonProperty]
    public string Name { get; set; }

    // "2000-12-15T22:11:03"
    [JsonProperty]
    public DateTime BirthDate { get; set; }

    // new Date(976918263055)
    [JsonProperty]
    public DateTime LastModified { get; set; }

    // not serialized because mode is opt-in
    public string Department { get; set; }
}