c# - json转c#反序列化

Question

我正在寻找如何按颜色将汽车添加到某个列表中。这是 json 文件，我使用 json2csharp 生成类。

我想使用比检查每辆车及其颜色列表更好的方法。例如，如果我有 40 辆汽车，那就太可怕了。

json

    {
       "cars":[
          {
             "bmw":{
                "color":[
                   "blue",
                   "red"
                ]
             },
             "price":5
          },
          {
             "audi":{
                "color":[
                   "blue",
                   "yellow",
                   "white"
                ]
             },
             "price":7
          },
          {
             "nil":"nil"
          },
          {
             "peugeot":{
                "color":[
                   "blue",
                   "red",
                   "yellow",
                   "orange"
                ]
             },
             "price":12
          },
          {
             "ferrari":{
                "color":[
                   "blue",
                   "yellow",
                   "orange"
                ]
             },
             "price":12
          }
       ]
    }

代码

public class Bmw
{
    public List<string> color { get; set; }
}

public class Audi
{
    public List<string> color { get; set; }
}

public class Peugeot
{
    public List<string> color { get; set; }
}

public class Ferrari
{
    public List<string> color { get; set; }
}

public class Car
{
    public Bmw bmw { get; set; }
    public int price { get; set; }
    public Audi audi { get; set; }
    public string nil { get; set; }
    public Peugeot peugeot { get; set; }
    public Ferrari ferrari { get; set; }
}

public class RootObject
{
    public List<Car> cars { get; set; }
}

using (StreamReader r = new StreamReader("carDB.json"))
            {
                string json = r.ReadToEnd();

                RootObject car = JsonConvert.DeserializeObject<RootObject>(json);

                foreach(Car c in car.cars)
                {

                }

            }

Answer 1

您可以通过使用 System.Reflection 库来实现它，这会在一定程度上增加性能损失，但我认为代码对性能不是关键的，所以您会没事的。

首先，你需要创建一个接口(interface):

public interface ICar
{
    List<string> color { get; set;}
}

Car 类应该实现该接口(interface):

public class Bmw : ICar
{
    public List<string> color { get; set; }
}

之后，您可以通过过滤掉实现ICar 接口(interface)类型的属性来遍历Car 对象。

RootObject root = JsonConvert.DeserializeObject<RootObject>(json);
foreach (var car in root.cars)
{
    var carProperties = car.GetType().GetProperties().Where(p => typeof(ICar).IsAssignableFrom(p.PropertyType));
    foreach (var carType in carProperties)
    {
        var c = carType.GetValue(car);
        if (c != null)
        {
            var colors = ((ICar)c).color;
            //Do your thing...
        }
    }
}