我们发现该序列化方法抛出了异常，并没有按照我们预想的方式进行反序列化，JSON.NET提供如下的方式指定公有构造函数。

; Website website = Newtonsoft.Json.JsonConvert.DeserializeObject<Website>(json, new Newtonsoft.Json.JsonSerializerSettings { ConstructorHandling = Newtonsoft.Json.ConstructorHandling.AllowNonPublicDefaultConstructor }); Console.WriteLine(website.Url);

执行结果：

另外，JSON.NET提供了指定任何构造函数的JsonConstructorAttribute特性，只需要在构造函数上标记，即可指定构造函数。

public class Users { ; } ; } public Users() { } [Newtonsoft.Json.JsonConstructor] public Users(string userName, bool enabled) { UserName = userName; Enabled = enabled; } } ; Users user = Newtonsoft.Json.JsonConvert.DeserializeObject<Users>(json); Console.WriteLine(user.UserName);

执行结果：

13、当对象的属性为默认值(0或null)时不序列化该属性

public class Person { public string Name { get; set; } public int Age { get; set; } public Person Partner { get; set; } public decimal? Salary { get; set; } } Person person1 = new Person(); string json1 = Newtonsoft.Json.JsonConvert.SerializeObject(person1, Newtonsoft.Json.Formatting.Indented, new Newtonsoft.Json.JsonSerializerSettings { DefaultValueHandling = Newtonsoft.Json.DefaultValueHandling.Ignore }); Console.WriteLine(json1); Console.WriteLine(""); Person person2 = }; string json2 = Newtonsoft.Json.JsonConvert.SerializeObject(person2, Newtonsoft.Json.Formatting.Indented, new Newtonsoft.Json.JsonSerializerSettings { DefaultValueHandling = Newtonsoft.Json.DefaultValueHandling.Ignore }); Console.WriteLine(json2);

执行结果：

14、Newtonsoft.Json（JSON.NET）中忽略null值得处理器

public class Person { public string Name { get; set; } public int Age { get; set; } public Person Partner { get; set; } public decimal? Salary { get; set; } } Person person = , Age = 46 }; string jsonIncludeNullValues = Newtonsoft.Json.JsonConvert.SerializeObject(person, Newtonsoft.Json.Formatting.Indented); Console.WriteLine(jsonIncludeNullValues); Console.WriteLine(""); string json = Newtonsoft.Json.JsonConvert.SerializeObject(person, Newtonsoft.Json.Formatting.Indented, new Newtonsoft.Json.JsonSerializerSettings { NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore }); Console.WriteLine(json);

执行结果：

15、JSON.NET中循环引用的处理方法

Employee employee1 = }; Employee employee2 = }; employee1.Manager = employee2; employee2.Manager = employee2; string json = Newtonsoft.Json.JsonConvert.SerializeObject(employee1, Newtonsoft.Json.Formatting.Indented, new Newtonsoft.Json.JsonSerializerSettings { ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore }); Console.WriteLine(json); public class Employee { public string Name { get; set; } public Employee Manager { get; set; } }

执行结果：