asp.net-mvc - 使用 MissingMemberHandling.Error 时 NewtonSoft JSON 未引发异常

Question

我们使用 Newtonsoft Json 转换器来反序列化 API 请求。由于我们不想接收不属于后端请求类的数据/成员，因此我们设置SerializerSettings.MissingMemberHandling为MissingMemberHandling.Error：

services.AddControllers().AddNewtonsoftJson(a =>
    {
        a.SerializerSettings.MissingMemberHandling = MissingMemberHandling.Error;
    }

但我们最终没有收到异常，而是为 API 调用提供了一个“空”请求对象：

为什么我们没有异常？

Answer 1

我不知道你是如何配置 Newtonsoft.Json 的。我做了一个工作示例。这是步骤。

1. 添加以下 Nuget 包。

   Microsoft.AspNetCore.Mvc.NewtonsoftJson

2. 配置它在Startup.cs.

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllersWithViews()
            .AddNewtonsoftJson(option=>
            {
                option.SerializerSettings.MissingMemberHandling = MissingMemberHandling.Error;
            });
    }
   

3. 添加请求操作和模型。这是所有控制器代码。

   [ApiController]
   [Route("[controller]")]
   public class ValController:Controller
   {
    [AllowAnonymous]
    [HttpPost]
    public IActionResult LoginAsync([FromBody]Login login)
    {
        return Ok(login);
    }
   }
   public class Login
   {
    public string comm { get; set; }
   }
   

4. 然后我访问操作。

Answer 2

I found the problem: my controller was configurered like this:

[Route("api/[controller]")]
public class MyController
{
}

Since everything was working as expected before we added the missing member setting, I did not think of the missing attribute [ApiController]. Adding this, made this controller act like the others regarding the Json serialisation!

[Route("api/[controller]")]
[ApiController]  // <- added this
public class MyController
{
}

To be sure this isn’t forgotten, we wrote a test which checks all controller classes for this attribute.