c# - 没有 MediaTypeFormatter 可用于读取 asp.net web api 中类型为 'Advertisement' 的对象

Question

我有一个名为 Advertisement 的类:

 public class Advertisement
{
    public string Title { get; set; }
    public string Desc { get; set; }
}

在我的 Controller 中:

public class OrderController : ApiController
{
    public UserManager<IdentityUser> UserManager { get; private set; }

    // Post api/Order/Test

    [Route("Test")]
    public IHttpActionResult Test(Advertisement advertisement)
    {
        var currentUser = User.Identity.GetUserId();
        Task<IdentityUser> user = UserManager.FindByIdAsync(currentUser);

      return Ok(User.Identity.GetUserId());
    }

但是当我用 Postman 测试它时，我遇到了这个错误，

 "Message": "The request contains an entity body but no Content-Type header. The inferred media type 'application/octet-stream' is not supported for this resource.",
"ExceptionMessage": "No MediaTypeFormatter is available to read an object of type 'Advertisement' from content with media type 'application/octet-stream'.",
"ExceptionType": "System.Net.Http.UnsupportedMediaTypeException",
"StackTrace": "   at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\r\n   at System.Net.Http.HttpContentExtensions.ReadAsAsync(HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\r\n   at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)"

任何人都可以帮助我吗？

Answer 1

在您的 WebApiConfig.cs 中将其添加到寄存器中

config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/octet-stream"));