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基础拾遗 C# Json 与对象相互转换

方法一.JavaScriptSerializer

方法二.JsonConvert

示例:

Web API项目

1.新建 Model:

namespace WebApi
{
  public class Product
  {
    public string Name { set; get; }
    public string Price { set; get; }
  }

  public class ShoppingCart
  {
    public string Name { set; get; }
    public List<Product> ProductList { set; get; }
  }
}

 

2.序列化与反序列化工具类

(1).新建使用JavaScriptSerializer方法的的工具类JsonHelper:

...

using System.Web.Script.Serialization;

namespace WebApi
{
  public static class JsonHelper<T>
  {
    private static JavaScriptSerializer serializer = new JavaScriptSerializer();
    public static string GetJsonStr(T objectList)
    {
      return serializer.Serialize(objectList);
    }

    public static List<T> GetObjectList<T>(string jsonStr)
    {
      List<T> objs = serializer.Deserialize<List<T>>(jsonStr);
      return objs;
    }

    public static T GetObj(string jsonStr)
    {
      return serializer.Deserialize<T>(jsonStr);
    }
  }
}

 

(1).新建使用JsonConvert方法的的工具类NetJsonHelper:

...

using Newtonsoft.Json;

namespace WebApi.Common
{
  public class NetJsonHelper<T>
  {
    public static string GetJsonStr(T obj)
    {
      return JsonConvert.SerializeObject(obj);
    }

    public static T GetObj(string objJsonStr)
    {
      return (T)JsonConvert.DeserializeObject<T>(objJsonStr);
    }

    public static List<T> GetObjs(string objsJsonStr)
    {
      return (List<T>)JsonConvert.DeserializeObject<List<T>>(objsJsonStr);
    }

  }
}

 

3.新建控制器 ShoppingController

 

public class ShoppingController : ApiController
{

  private static ShoppingCart shoppingCart = new ShoppingCart();
  private static string productsStr = string.Empty; //保存序列化字符串
  public ShoppingController()
  {
    List<Product> products = new List<Product>() {
    new Product(){Name="Apple",Price="$20/kg"},
    new Product(){Name="Banana",Price="$15/kg"},
    new Product(){Name="Melon",Price="$20/kg"}
  };
  shoppingCart.Name = "MyFruitBaskit";
  shoppingCart.ProductList = products;
  }

  public string GetShoppingCart()
  {
    string JsonStr = JsonHelper<ShoppingCart>.GetJsonStr(shoppingCart);
    productsStr=JsonStr;  //将序列化后的字符串保存起来用于反序列化接口测试
    return JsonStr;
  }

  public IEnumerable<Product> GetFruitList()
  {
    ShoppingCart shoppingCartObj = JsonHelper<ShoppingCart>.GetObj(productsStr);
    return shoppingCartObj.ProductList;
  }

  public string GetShoppingCartByNetJson()
  {
    string JsonStr = NetJsonHelper<ShoppingCart>.GetJsonStr(shoppingCart);
    productsStr = JsonStr; //将序列化后的字符串保存起来用于反序列化接口测试
    return JsonStr;
  }

  public IEnumerable<Product> GetFruitListByNetJson()
  {
    ShoppingCart shoppingCartObj = NetJsonHelper<ShoppingCart>.GetObj(productsStr);
    return shoppingCartObj.ProductList;
  }

}

4.启动WEB API进行测试

如:测试JavaScriptSerializer      

先:  localhost:xxxx/api/Shopping/GetShoppingCart

然后: localhost:xxxx/api/Shopping/GetFruitList

两种方法不论在序列化还是反序列化时,当传入的是 null 时均不会出异常

基础拾遗 C# Json 与对象相互转换