问题:

我正在使用Web API创建一个Web服务。 我实现了一个简单的类

public class ActivityResult
{
    public String code;
    public int indexValue;
    public int primaryCodeReference;
}

然后我在我的控制器内实现了

[HttpPost]
public HttpResponseMessage Post(ActivityResult ar)
{
    return new HttpResponseMessage(HttpStatusCode.OK);
}

但是当我调用API传递POST文件时json:

{"code":"XXX-542","indexValue":"3","primaryCodeReference":"7"}

我收到以下错误消息:

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

我究竟做错了什么?

I’m creating a web service using Web API.I implemented a simple classAnd then I have implemented inside my controllerBut when I call the API passing in POST the file json:I obtain the following error message:What am I doing wrong?

问题:

当在WebApi GET操作中找不到某些内容时,我将返回NotFound IHttpActionResult 与此响应一起,我要发送自定义消息和/或异常消息(如果有)。 当前的ApiControllerNotFound()方法没有提供重载来传递消息。

有什么办法吗? 还是我必须编写自己的自定义IHttpActionResult ?

I am returning a NotFound IHttpActionResult , when something is not found in my WebApi GET action.Along with this response, I want to send a custom message and/or the exception message (if any).The current ApiController ‘s NotFound() method does not provide an overload to pass a message.Is there any way of doing this?or I will have to write my own custom IHttpActionResult ?

问题:

我已经按照本教程进行了很好的工作,直到我修改了我的DbContext以获得额外的构造函数。 我现在遇到了解决方案的问题,不知道如何解决这个问题。 是否有一种简单的方法可以强制它抓住无参数构造函数,或者我接近这个错误?

带有两个构造函数的DbContext :

public class DashboardDbContext : DbContext
{
    public DashboardDbContext() : base("DefaultConnection") { }

    public DashboardDbContext(DbConnection dbConnection, bool owns)
        : base(dbConnection, owns) { }
}

SiteController构造函数:

private readonly IDashboardRepository _repo;

public SiteController(IDashboardRepository repo)
{
    _repo = repo;
}

库:

DashboardDbContext _context;

public DashboardRepository(DashboardDbContext context)
{
    _context = context;
}

UnityResolver代码:

public class UnityResolver : IDependencyResolver
{
    private readonly IUnityContainer _container;

    public UnityResolver(IUnityContainer container)
    {
        _container = container;
    }

    public object GetService(Type serviceType)
    {
        try
        {
            return _container.Resolve(serviceType);
        }
        catch (ResolutionFailedException)
        {
            return null;
        }
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        try
        {
            return _container.ResolveAll(serviceType);
        }
        catch (ResolutionFailedException)
        {
            return new List<object>();
        }
    }

    public IDependencyScope BeginScope()
    {
        var child = _container.CreateChildContainer();
        return new UnityResolver(child);
    }

    public void Dispose()
    {
        _container.Dispose();
    }
}

WebApiConfig:

var container = new UnityContainer();
container.RegisterType<IDashboardRepository, DashboardRepository>(new HierarchicalLifetimeManager());
config.DependencyResolver = new UnityResolver(container);

WebApi调用出错:

System.InvalidOperationException:尝试创建“SiteController”类型的控制器时发生错误。 确保控制器具有无参数的公共构造函数。

at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType) 
at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request) 
at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken) 
at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__0.MoveNext()

InnerException:System.ArgumentException:Type’Dashboard.Web.Controllers.SiteController’没有默认构造函数。

at System.Linq.Expressions.Expression.New(Type type) 
at System.Web.Http.Internal.TypeActivator.Create[TBase](Type instanceType) 
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator) 
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)

该教程非常棒,并且在我添加第二个构造函数之前一直很好用。

I have followed this tutorial which has worked great, until I modified my DbContext to have an additional constructor.I am now having issues with the resolution and not sure what to do to fix this.Is there an easy way to force it to grab the parameterless constructor or I am approaching this incorrectly?DbContext with two constructors:SiteController constructor:Repository:UnityResolver code:WebApiConfig:Error from WebApi Call:System.InvalidOperationException: An error occurred when trying to create a controller of type ‘SiteController’.Make sure that the controller has a parameterless public constructor.InnerException: System.ArgumentException: Type ‘Dashboard.Web.Controllers.SiteController’ does not have a default constructor.The tutorial was great and has been working well for me up until I added the second constructor.

问题:

我使用vS2012创建了一个mvc4 Web API项目。 我使用以下教程来解决跨域资源共享,“ http://blogs.msdn.com/b/carlosfigueira/archive/2012/07/02/cors-support-in-asp-net-web-api- rc-version.aspx”。 它工作正常,并且我将数据从客户端成功发布到服务器。

之后,为了在我的项目中实施Autherization,我使用了以下教程来实现OAuth2:“ http://community.codesmithtools.com/CodeSmith_Community/b/tdupont/archive/2011/03/18/oauth-2-0-for -mvc-two-legged-implementation.aspx”。 这有助于我在客户端获取RequestToken。

但是,当我从客户端发布数据时,出现错误, “ XMLHttpRequest无法加载http://。Access-Control-Allow-Headers不允许请求标头字段Content-Type。”

我的客户端代码看起来像

 function PostLogin() {
    var Emp = {};            
    Emp.UserName = $("#txtUserName").val();             
    var pass = $("#txtPassword").val();
    var hash = $.sha1(RequestToken + pass);
            $('#txtPassword').val(hash);
    Emp.Password= hash;
    Emp.RequestToken=RequestToken;
    var createurl = "http://localhost:54/api/Login";
    $.ajax({
        type: "POST",
        url: createurl,
        contentType: "application/json; charset=utf-8",
        data: JSON.stringify(Emp),
        statusCode: {
                200: function () {
                $("#txtmsg").val("done");                       
                toastr.success('Success.', '');                         
                }
                },
        error:
            function (res) {                        
                toastr.error('Error.', 'sorry either your username of password was incorrect.');            
                }
        });
    };

我的api控制器看起来像

    [AllowAnonymous]
    [HttpPost]
    public LoginModelOAuth PostLogin([FromBody]LoginModelOAuth model)
    {
        var accessResponse = OAuthServiceBase.Instance.AccessToken(model.RequestToken, "User", model.Username, model.Password, model.RememberMe);

        if (!accessResponse.Success)
        {
            OAuthServiceBase.Instance.UnauthorizeToken(model.RequestToken);
            var requestResponse = OAuthServiceBase.Instance.RequestToken();

            model.ErrorMessage = "Invalid Credentials";

            return model;
        }
        else
        {
            // to do return accessResponse

            return model;
        }

    } 

我的webconfig文件看起来像

 <configuration>
   <configSections>   
   <section name="entityFramework"    type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  <section name="oauth" type="MillionNodes.Configuration.OAuthSection, MillionNodes, Version=1.0.0.0, Culture=neutral"/>
  <sectionGroup name="dotNetOpenAuth" type="DotNetOpenAuth.Configuration.DotNetOpenAuthSection, DotNetOpenAuth.Core">
  <section name="messaging" type="DotNetOpenAuth.Configuration.MessagingElement, DotNetOpenAuth.Core" requirePermission="false" allowLocation="true" />
  <section name="reporting" type="DotNetOpenAuth.Configuration.ReportingElement, DotNetOpenAuth.Core" requirePermission="false" allowLocation="true" />
</sectionGroup>
</configSections>
<oauth defaultProvider="DemoProvider" defaultService="DemoService">
<providers>
  <add name="DemoProvider" type="MillionNodes.OAuth.DemoProvider, MillionNodes" />
</providers>
<services>
  <add name="DemoService" type="MillionNodes.OAuth.DemoService, MillionNodes" />
</services>
</oauth>
<system.web>
 <httpModules>
   <add name="OAuthAuthentication" type="MillionNodes.Module.OAuthAuthenticationModule, MillionNodes, Version=1.0.0.0, Culture=neutral"/>
  </httpModules>
 <compilation debug="true" targetFramework="4.0" />
<authentication mode="Forms">
  <forms loginUrl="~/Account/Login" timeout="2880" />
</authentication>
<pages>
  <namespaces>
    <add namespace="System.Web.Helpers" />
    <add namespace="System.Web.Mvc" />
    <add namespace="System.Web.Mvc.Ajax" />
    <add namespace="System.Web.Mvc.Html" />
    <add namespace="System.Web.Optimization" />
    <add namespace="System.Web.Routing" />
    <add namespace="System.Web.WebPages" />
  </namespaces>
</pages>
</system.web>
<system.webServer>
 <validation validateIntegratedModeConfiguration="false" />      
  <modules>
      <add name="OAuthAuthentication"     type="MillionNodes.Module.OAuthAuthenticationModule, MillionNodes, Version=1.0.0.0, Culture=neutral" preCondition="" />
 </modules>
 <httpProtocol>
  <customHeaders>
    <add name="Access-Control-Allow-Origin" value="*" />
    </customHeaders>
  </httpProtocol>
</system.webServer>
<dotNetOpenAuth>
<messaging>
  <untrustedWebRequest>
    <whitelistHosts>
      <!-- Uncomment to enable communication with localhost (should generally not activate in production!) -->
      <!--<add name="localhost" />-->
    </whitelistHosts>
  </untrustedWebRequest>
</messaging>
<!-- Allow DotNetOpenAuth to publish usage statistics to library authors to improve the library. -->
<reporting enabled="true" />

I created an mvc4 web api project using vS2012.I used following tutorial to solve the Cross-Origin Resource Sharing, “http://blogs.msdn.com/b/carlosfigueira/archive/2012/07/02/cors-support-in-asp-net-web-api-rc-version.aspx”.It is working successfully, and i post data from client side to server successfully.After that for implementing Autherization in my project, I used the following tutorial to implement OAuth2, “http://community.codesmithtools.com/CodeSmith_Community/b/tdupont/archive/2011/03/18/oauth-2-0-for-mvc-two-legged-implementation.aspx”.This is help me for getting RequestToken on client side.But when i post data from client side, i got the error, “XMLHttpRequest cannot load http://. Request header field Content-Type is not allowed by Access-Control-Allow-Headers.”My client side code look like,My api controller look like,My webconfig file look like,

问题:

这是在我的Web API上调用PUT方法 – 方法的第三行(我从ASP.NET MVC前端调用Web API):

在此输入图像描述

client.BaseAddresshttp://localhost/CallCOPAPI/

这是contactUri :

在此输入图像描述

这是contactUri.PathAndQuery :

在此输入图像描述

最后,这是我的405回复:

在此输入图像描述

这是我的Web API项目中的WebApi.config:

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

            config.Routes.MapHttpRoute(
                name: "DefaultApiGet",
                routeTemplate: "api/{controller}/{action}/{regionId}",
                defaults: new { action = "Get" },
                constraints: new { httpMethod = new HttpMethodConstraint("GET") });

            var json = config.Formatters.JsonFormatter;
            json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects;
            config.Formatters.Remove(config.Formatters.XmlFormatter);

我已经尝试将传递给PutAsJsonAsync的路径剥离到string.Format("/api/department/{0}", department.Id)string.Format("http://localhost/CallCOPAPI/api/department/{0}", department.Id)没有运气。

有没有人有任何想法为什么我得到405错误?

UPDATE

根据请求,这是我的部门控制器代码(我将发布我的前端项目的部门控制器代码,以及WebAPI的部门ApiController代码):

前端部门控制员

namespace CallCOP.Controllers
{
    public class DepartmentController : Controller
    {
        HttpClient client = new HttpClient();
        HttpResponseMessage response = new HttpResponseMessage();
        Uri contactUri = null;

        public DepartmentController()
        {
            // set base address of WebAPI depending on your current environment
            client.BaseAddress = new Uri(ConfigurationManager.AppSettings[string.Format("APIEnvBaseAddress-{0}", CallCOP.Helpers.ConfigHelper.COPApplEnv)]);

            // Add an Accept header for JSON format.
            client.DefaultRequestHeaders.Accept.Add(
                new MediaTypeWithQualityHeaderValue("application/json"));
        }

        // need to only get departments that correspond to a Contact ID.
        // GET: /Department/?regionId={0}
        public ActionResult Index(int regionId)
        {
            response = client.GetAsync(string.Format("api/department/GetDeptsByRegionId/{0}", regionId)).Result;
            if (response.IsSuccessStatusCode)
            {
                var departments = response.Content.ReadAsAsync<IEnumerable<Department>>().Result;
                return View(departments);
            }
            else
            {
                LoggerHelper.GetLogger().InsertError(new Exception(string.Format(
                    "Cannot retrieve the list of department records due to HTTP Response Status Code not being successful: {0}", response.StatusCode)));
                return RedirectToAction("Index");
            }

        }

        //
        // GET: /Department/Create

        public ActionResult Create(int regionId)
        {
            return View();
        }

        //
        // POST: /Department/Create
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(int regionId, Department department)
        {
            department.RegionId = regionId;
            response = client.PostAsJsonAsync("api/department", department).Result;
            if (response.IsSuccessStatusCode)
            {
                return RedirectToAction("Edit", "Region", new { id = regionId });
            }
            else
            {
                LoggerHelper.GetLogger().InsertError(new Exception(string.Format(
                    "Cannot create a new department due to HTTP Response Status Code not being successful: {0}", response.StatusCode)));
                return RedirectToAction("Edit", "Region", new { id = regionId });
            }
        }

        //
        // GET: /Department/Edit/5

        public ActionResult Edit(int id = 0)
        {
            response = client.GetAsync(string.Format("api/department/{0}", id)).Result;
            Department department = response.Content.ReadAsAsync<Department>().Result;
            if (department == null)
            {
                return HttpNotFound();
            }
            return View(department);
        }

        //
        // POST: /Department/Edit/5

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Edit(int regionId, Department department)
        {
            response = client.GetAsync(string.Format("api/department/{0}", department.Id)).Result;
            contactUri = response.RequestMessage.RequestUri;
            response = client.PutAsJsonAsync(string.Format(contactUri.PathAndQuery), department).Result;
            if (response.IsSuccessStatusCode)
            {
                return RedirectToAction("Index", new { regionId = regionId });
            }
            else
            {
                LoggerHelper.GetLogger().InsertError(new Exception(string.Format(
                    "Cannot edit the department record due to HTTP Response Status Code not being successful: {0}", response.StatusCode)));
                return RedirectToAction("Index", new { regionId = regionId });
            }
        }

        //
        // GET: /Department/Delete/5

        public ActionResult Delete(int id = 0)
        {
            response = client.GetAsync(string.Format("api/department/{0}", id)).Result;
            Department department = response.Content.ReadAsAsync<Department>().Result;

            if (department == null)
            {
                return HttpNotFound();
            }
            return View(department);
        }

        //
        // POST: /Department/Delete/5

        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        public ActionResult DeleteConfirmed(int regionId, int id)
        {
            response = client.GetAsync(string.Format("api/department/{0}", id)).Result;
            contactUri = response.RequestMessage.RequestUri;
            response = client.DeleteAsync(contactUri).Result;
            return RedirectToAction("Index", new { regionId = regionId });
        }
    }
}

Web API部门ApiController

namespace CallCOPAPI.Controllers
{
    public class DepartmentController : ApiController
    {
        private CallCOPEntities db = new CallCOPEntities(HelperClasses.DBHelper.GetConnectionString());

        // GET api/department
        public IEnumerable<Department> Get()
        {
            return db.Departments.AsEnumerable();
        }

        // GET api/department/5
        public Department Get(int id)
        {
            Department dept = db.Departments.Find(id);
            if (dept == null)
            {
                throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotFound));
            }

            return dept;
        }

        // this should accept a contact id and return departments related to the particular contact record
        // GET api/department/5
        public IEnumerable<Department> GetDeptsByRegionId(int regionId)
        {
            IEnumerable<Department> depts = (from i in db.Departments
                                             where i.RegionId == regionId 
                                             select i);
            return depts;
        }

        // POST api/department
        public HttpResponseMessage Post(Department department)
        {
            if (ModelState.IsValid)
            {
                db.Departments.Add(department);
                db.SaveChanges();

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, department);
                return response;
            }
            else
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }
        }

        // PUT api/department/5
        public HttpResponseMessage Put(int id, Department department)
        {
            if (!ModelState.IsValid)
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }

            if (id != department.Id)
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }

            db.Entry(department).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
            }

            return Request.CreateResponse(HttpStatusCode.OK);
        }

        // DELETE api/department/5
        public HttpResponseMessage Delete(int id)
        {
            Department department = db.Departments.Find(id);
            if (department == null)
            {
                return Request.CreateResponse(HttpStatusCode.NotFound);
            }

            db.Departments.Remove(department);

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
            }

            return Request.CreateResponse(HttpStatusCode.OK, department);
        }
    }
}

Here’s the call to the PUT method on my Web API – the third line in the method (I am calling the Web API from an ASP.NET MVC front end):client.BaseAddress is http://localhost/CallCOPAPI/ .Here’s contactUri :Here’s contactUri.PathAndQuery :And finally, here’s my 405 response:Here’s the WebApi.config in my Web API project:I’ve tried stripping down the path that gets passed into PutAsJsonAsync to string.Format("/api/department/{0}", department.Id) and string.Format("http://localhost/CallCOPAPI/api/department/{0}", department.Id) with no luck.Does anyone have any ideas why I’m getting the 405 error?UPDATEAs per request, here’s my Department controller code (I will post both the Department controller code for my front end project, as well as the Department ApiController code for the WebAPI):Front End Department ControllerWeb API Department ApiController