.NET 6最小API-返回接口

发布于 2025-02-05 14:52:25 字数 449 浏览 1 评论 0原文

我有麻烦的是返回新的最小API接口。让我们假设以下简单方案：

interface ICar {
    public string PropA {get; set; }
}

class CarExample : ICar {
  public string PropA {get; set; }
  public string PropB {get; set; }
}

app.MapGet("/car", async ([FromServices] ICarRepository carRepository, int carId)
{
    var car = await carRepository.GetCarByIdAsync(carId);
    return car;
})

carrespository返回ICAR。不幸的是，JSON结果没有可能。铸造不是一种选择，因为我不知道确切的汽车。

原文

I have troubles to return an interface with the new minimal Api.
Lets assume the follow simple scenario:

interface ICar {
    public string PropA {get; set; }
}

class CarExample : ICar {
  public string PropA {get; set; }
  public string PropB {get; set; }
}

app.MapGet("/car", async ([FromServices] ICarRepository carRepository, int carId)
{
    var car = await carRepository.GetCarByIdAsync(carId);
    return car;
})

The carRespository returns ICar as Result.
Unfortunately the Json Result has no ProbB.
Casting is not an option, because I do not know the exact Car.

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梨涡少年 2025-02-12 14:52:25

一个选项是将CAR铸造为对象：

app.MapGet("/car", async ([FromServices] ICarRepository carRepository, int carId) =>
{
    ...
    return (object)car;
});

我非常确定它是由于system.text.json在序列化过程中处理通用物的原因而发生的：

ICar car = ...;
var serialize = JsonSerializer.Serialize(car); // contains only ICar props
var serialize1 = JsonSerializer.Serialize<object>(car); // contains all props

请参阅关于多型销售的文档。

One option is to cast car to object:

app.MapGet("/car", async ([FromServices] ICarRepository carRepository, int carId) =>
{
    ...
    return (object)car;
});

I pretty much sure it happens due to how System.Text.Json handles generics during serialization:

ICar car = ...;
var serialize = JsonSerializer.Serialize(car); // contains only ICar props
var serialize1 = JsonSerializer.Serialize<object>(car); // contains all props

See the docs on polymorphic serialization.

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