扩展JavaScriptSerializer之Camelcase属性名

  在Web端开发中,经常会使用到JSON作为数据源进行交互,C# 4.0中提供了JavaScriptSerializer来序列化和反序列化JSON,它在System.Web.Extension中,由于在JavaScript中,大多数的命名方式都是以Camelcase为主的,可能有些人会跟我一样,对于返回Pascal Case方式的JSON可能会比较纠结,使用过JSON.NET的博友应该知道,它提供了一个CamelCasePropertyNamesContractResolver的类,来序列化Camelcase属性名,但是JavaScriptSerializer貌似并没有提供相应的类,那么接下来我们就自己来实现支持Camelcase属性名的扩展吧。

  首先创建一个实体类,如:

1 class Person
2 {
3     public int Id { get; set; }
4 
5     public string Name { get; set; }
6 }

  我们先用原始的方式来看一下输入的结果,代码如下:

1 Person person = new Person
2 {
3     Id = 5,
4     Name = "aa"
5 };
6 JavaScriptSerializer serialize = new JavaScriptSerializer();
7 Console.WriteLine(serialize.Serialize(person));

  输出的结果为:{"Id":5,"Name":"aa"}

  在JavaScriptSerializer中,JavaScriptConverter类的作用是提供了开发人员自定义序列化与反序列化的能力,该类是一个抽象类,关于该类的具体介绍可以查看,实现Camelcase属性名的代码如下:

View Code
 1 public class PersonCamelcasePropertyNameConverter : JavaScriptConverter
 2 {
 3     public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
 4     {
 5         //反序列化代码
 6     }
 7 
 8     public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
 9     {
10         return (from p in typeof(Person).GetProperties()
11                 select new
12                 {
13                     name = string.Format("{0}{1}", p.Name.Substring(0, 1).ToLower(), p.Name.Substring(1)),
14                     value = p.GetValue(obj, null)
15                 }).ToDictionary(o => o.name, o => o.value);
16     }
17 
18     public override IEnumerable<Type> SupportedTypes
19     {
20         get { return new Type[] { typeof(Person) }; }
21     }
22 }

  使用我们实现的类来重新修改一下测试代码:

1 //上面提供的代码省略
2 serialize.RegisterConverters(new[] { new PersonCamelcasePropertyNameConverter() });
3 Console.WriteLine(serialize.Serialize(person));

  输出的结果为:{"id":5,"name":"aa"},达到了预期的效果,但是通过观察PersonCamelcasePropertyNameConverter的代码,我们发现其实将Person替换成泛型T也是可以成立的,而且其余的代码都不用修改,这就成了一个通用的方案了,于是再一次做了小小的调整,代码如下:

View Code
 1 public class CamelcasePropertyNameConverter<T> : JavaScriptConverter
 2 {
 3     public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
 4     {
 5         //反序列化代码
 6     }
 7 
 8     public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
 9     {
10         return (from p in typeof(T).GetProperties()
11                 select new
12                 {
13                     name = string.Format("{0}{1}", p.Name.Substring(0, 1).ToLower(), p.Name.Substring(1)),
14                     value = p.GetValue(obj, null)
15                 }).ToDictionary(o => o.name, o => o.value);
16     }
17 
18     public override IEnumerable<Type> SupportedTypes
19     {
20         get { return new Type[] { typeof(T) }; }
21     }
22 }

  调整一下Person类并调整代码,代码如下:

 1 class Person
 2 {
 3     public int Id { get; set; }
 4 
 5     public string Name { get; set; }
 6 
 7     public Company Company { get; set; }
 8 }
 9 
10 class Company
11 {
12     public string Name { get; set; }
13 }
14 
15 //测试代码
16 
17 Person person = new Person
18 {
19     Id = 5,
20     Name = "ahl5esoft",
21     Company = new Company
22     {
23         Name = "5esoft"
24     }
25 };
26 JavaScriptSerializer serialize = new JavaScriptSerializer();
27 serialize.RegisterConverters(new JavaScriptConverter[] { 
28     new CamelcasePropertyNameConverter<Person>(), 
29     new CamelcasePropertyNameConverter<Company>() });
30 
31 Console.WriteLine(serialize.Serialize(person));

  输出结果为:{"id":5,"name":"ahl5esoft","company":{"name":"5esoft"}}

  如果想简化JavaScriptSerializer的调用,可以自己对其创建相应的扩展方法。

  文章就到这里了,以上如有错误和不足请指出,谢谢!

posted @ 2013-04-15 16:13  ahl5esoft  阅读(1694)  评论(2编辑  收藏  举报