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我想從（DHC by Restlet）上傳圖像到我的C＃API。將來我想從Android或iPhone應用程序中調用此API，但我發現在任何此類設備上實現它之前，我需要這部分工作。從HTTP客戶端上傳到C＃Web Api的圖像
這個C＃代碼放在我的api：s ValuesController中。我默認呼叫的控制器。我已經確定（通過斷點）下面的方法是可訪問和正確調用的。
public async Task<HttpResponseMessage> PostFormData()
{
// Check if the request contains multipart/form-data.
if (!Request.Content.IsMimeMultipartContent())
{
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
}
string root = HttpContext.Current.Server.MapPath("~/App_Data");
var provider = new MultipartFormDataStreamProvider(root);
try
{
// Read the form data.
await Request.Content.ReadAsMultipartAsync(provider);
// This illustrates how to get the file names.
foreach (MultipartFileData file in provider.FileData)
{
Trace.WriteLine(file.Headers.ContentDisposition.FileName);
Trace.WriteLine("Server file path: " + file.LocalFileName);
}
return Request.CreateResponse(HttpStatusCode.OK);
}
catch (System.Exception e)
{
return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e);
}
}
。但是，我在嘗試發佈png格式我的服務時，出現以下錯誤：
System.IO.IOException was caught
HResult=-2146232800
Message=Unexpected end of MIME multipart stream. MIME multipart message is not complete.
Source=System.Net.Http.Formatting
StackTrace:
at System.Net.Http.Formatting.Parsers.MimeMultipartBodyPartParser.<ParseBuffer>d__0.MoveNext()
at System.Net.Http.HttpContentMultipartExtensions.MoveNextPart(MultipartAsyncContext context)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Nutris.Webapi.Controllers.ValuesController.<PostFormData>d__12.MoveNext() in c:\Users\Simon\Documents\GitHub\Nutris\Nutris.Webapi\Controllers\ValuesController.cs:line 836
的InnerException：
它發生在該行：
await Request.Content.ReadAsMultipartAsync(provider);
我錯過了什麼？感覺就像我忘了提及上述方法的mimetype。