asp.net-core - 从 RC2 迁移到 1.0 : Returning 'dynamic' from controller action causes strange web api response

Question

我最近从 RC2 迁移到 1.0，并且在 Web API 响应方面遇到问题。

行动

 public dynamic GetCountries(string startsWith)
        {
            return Ok(_countryService.GetList(startsWith));
        }

RC2 中的 Json 响应

[{
      "CountryCode": "ANG",
      "CountryName": "Angola"
    },
    {
      "CountryCode": "ANT",
      "CountryName": "Antigua and Barbuda"      
    }]

1.0 中的 Json 响应

{
  "value": [
    {
      "countryCode": "ANG",
      "countryName": "Angola"    
    },
    {
      "countryCode": "ANT",
      "countryName": "Antigua and Barbuda"
    }],
  "formatters": [],
  "contentTypes": [],
  "declaredType": null,
  "statusCode": 200
}

1.0 中对动态类型的响应添加了对象包装器，而之前的情况并非如此，属性采用小驼峰式大小写。我在迁移时做错了什么吗？

Project.json

"dependencies": {

    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.0",
    "Microsoft.AspNetCore.Razor.Tools": {
      "version": "1.0.0-preview1-final",
      "type": "build"
    },
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Logging": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.Extensions.Logging.Debug": "1.0.0",
    "Microsoft.IdentityModel.Tokens": "5.0.0",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0",  
  },

  "tools": {
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },

  "frameworks": {
    "net461": { }
  },

Answer 1

这是一个已知问题:https://github.com/aspnet/Mvc/issues/4960

为什么你希望这里的返回类型是动态？为什么不返回 IActionResult 呢？

上述问题的建议解决方法，或者您可以将返回类型更改为 IActionResult

public class Fix4960ActionFilter : IActionFilter
{
    public void OnActionExecuting(ActionExecutingContext context) { }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        var objectResult = context.Result as ObjectResult;
        if (objectResult?.Value is IActionResult)
        {
            context.Result = (IActionResult)objectResult.Value;
        }
    }
}