ExceptionMessage":"没有MediaTypeFormatter可用于从"postman"中媒体类型为"multipart/form-data"的内容中读取"user"类型的对象

Question

我正在使用Web API创建登录服务.当我与检查fiddler它的正常工作,但是当我与检查postman的chrome它的示值误差:

{    "Message": "An error has occurred.",
    "ExceptionMessage": "No MediaTypeFormatter is available to read an object of type 'user' from content with media type 'multipart/form-data'.",
    "ExceptionType": "System.InvalidOperationException",
    "StackTrace": "   
    at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger)\r\n
    at System.Net.Http.HttpContentExtensions.ReadAsAsync(HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger)\r\n
    at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger)\r\n
    at System.Web.Http.ModelBinding.FormatterParameterBinding.ExecuteBindingAsync(ModelMetadataProvider metadataProvider, HttpActionContext actionContext, CancellationToken cancellationToken)\r\n
    at System.Web.Http.Controllers.HttpActionBinding.<>c__DisplayClass1.<ExecuteBindingAsync>b__0(HttpParameterBinding parameterBinder)\r\n
    at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()\r\n
    at System.Threading.Tasks.TaskHelpers.IterateImpl(IEnumerator`1 enumerator, CancellationToken cancellationToken)" 
}

public class user
{
    //public user(string userId, string password)
    //{
    //    UserId = userId;
    //    Password = password;
    //}

    public string UserId { get; set; }
    public string Password { get; set; }
}

我正在检查postman此服务是否能够在移动应用程序中访问.另外,在mac系统中检查一下.

Answer 1

单击Header按钮,键入此标题和值

Content-Type: application/json

检查以下链接的小提琴和邮差都使用相同的内容类型 错误将POST中的json发送到Web API服务