C# WebAPI服务中的批处理请求支持

我已在webapiconfig.cs中注册了批处理WebAPI和WebAPI服务，如下所示

config.Routes.MapHttpBatchRoute(
                routeName: "WebApiBatch",
                routeTemplate: "api/$batch",
                batchHandler: new DefaultHttpBatchHandler(GlobalConfiguration.DefaultServer));

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

和webAPI服务，如下所示

雇员阶级

public class Employee
    {
        public int EmployeeID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }

        public Employee()
        {

        }
        public Employee(int id, string LN, string FN)
        {
            this.EmployeeID = id;
            this.LastName = LN;
            this.FirstName = FN;

        }
    }

员工界面

interface IEmployeeRepository
    {
        IEnumerable<Employee> GetAll();
        Employee Get(int EmployeeID);
        Employee Add(Employee emp);
        void Remove(int EmployeeID);
        bool Update(Employee emp);
    }

以及整个ajax请求

$.ajax{
Content-type: "multipart/mixed; charset=UTF-8;boundary=batch_ec79f662-862e-4016-a19a-1dbff86d7120",
data:"--batch_ec79f662-862e-4016-a19a-1dbff86d7120↵Content-Type: multipart/mixed; boundary=changeset_eb327bfc-5424-47b6-becf-416c43e13899↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899↵Content-Type: application/http↵Content-Transfer-Encoding: binary ↵↵POST /api/Employee HTTP/1.1↵Content-Id: 0↵Content-Type: application/json; charset=utf-8 ↵↵{"EmployeeID":6,"FirstName":"angel","LastName":"dsfs"}↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899↵Content-Type: application/http↵Content-Transfer-Encoding: binary ↵↵PUT /api/Employee HTTP/1.1↵Content-Id: 1↵Content-Type: application/json; charset=utf-8 ↵↵{"EmployeeID":2,"FirstName":"kalai","LastName":"selvi"}↵↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899↵Content-Type: application/http↵Content-Transfer-Encoding: binary ↵↵PUT /api/Employee HTTP/1.1↵Content-Id: 2↵Content-Type: application/json; charset=utf-8 ↵↵{"EmployeeID":3,"FirstName":"Janet","LastName":"Leverling"}↵↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899↵Content-Type: application/http↵Content-Transfer-Encoding: binary ↵↵DELETE /api/Employee(3) HTTP/1.1↵Content-Id: 3↵Content-Type: application/json; charset=utf-8 ↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899--↵--batch_ec79f662-862e-4016-a19a-1dbff86d7120--",
type:"POST",
url:"/api/Employee"
}

提出请求后，我收到一条异常消息

1.  {Message: "The request entity's media type 'multipart/mixed' is not supported for this resource.",…}
1.  ExceptionMessage:"No MediaTypeFormatter is available to read an object of type 'Employee' from content with media type 'multipart/mixed'."
2.  ExceptionType:"System.Net.Http.UnsupportedMediaTypeException"
3.  Message:"The request entity's media type 'multipart/mixed' is not supported for this resource."
StackTrace:"   at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)
↵   at System.Net.Http.HttpContentExtensions.ReadAsAsync(HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)
↵   at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)"

---

我在哪里犯了错误

请确保您正在调用您配置的实际批处理路由，而不是直接调用EmployeeController上的端点。当您这样做时（我看到您的ajax调用有url:“/api/Employee”），您将得到该消息，因为这些端点不支持混合模式。如果改为调用批处理路由（/api/batch），那么就可以了。我使用的端点中没有美元符号，但是，我将其配置为api/批处理：

                routeName: "batch",
            routeTemplate: "api/batch",

$.ajax{
Content-type: "multipart/mixed; charset=UTF-8;boundary=batch_ec79f662-862e-4016-a19a-1dbff86d7120",
data:"--batch_ec79f662-862e-4016-a19a-1dbff86d7120↵Content-Type: multipart/mixed; boundary=changeset_eb327bfc-5424-47b6-becf-416c43e13899↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899↵Content-Type: application/http↵Content-Transfer-Encoding: binary ↵↵POST /api/Employee HTTP/1.1↵Content-Id: 0↵Content-Type: application/json; charset=utf-8 ↵↵{"EmployeeID":6,"FirstName":"angel","LastName":"dsfs"}↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899↵Content-Type: application/http↵Content-Transfer-Encoding: binary ↵↵PUT /api/Employee HTTP/1.1↵Content-Id: 1↵Content-Type: application/json; charset=utf-8 ↵↵{"EmployeeID":2,"FirstName":"kalai","LastName":"selvi"}↵↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899↵Content-Type: application/http↵Content-Transfer-Encoding: binary ↵↵PUT /api/Employee HTTP/1.1↵Content-Id: 2↵Content-Type: application/json; charset=utf-8 ↵↵{"EmployeeID":3,"FirstName":"Janet","LastName":"Leverling"}↵↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899↵Content-Type: application/http↵Content-Transfer-Encoding: binary ↵↵DELETE /api/Employee(3) HTTP/1.1↵Content-Id: 3↵Content-Type: application/json; charset=utf-8 ↵↵--changeset_eb327bfc-5424-47b6-becf-416c43e13899--↵--batch_ec79f662-862e-4016-a19a-1dbff86d7120--",
type:"POST",
url:"/api/Employee"
}

1.  {Message: "The request entity's media type 'multipart/mixed' is not supported for this resource.",…}
1.  ExceptionMessage:"No MediaTypeFormatter is available to read an object of type 'Employee' from content with media type 'multipart/mixed'."
2.  ExceptionType:"System.Net.Http.UnsupportedMediaTypeException"
3.  Message:"The request entity's media type 'multipart/mixed' is not supported for this resource."
StackTrace:"   at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)
↵   at System.Net.Http.HttpContentExtensions.ReadAsAsync(HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)
↵   at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)"

                routeName: "batch",
            routeTemplate: "api/batch",