我正在尝试将图像从(DHC by Restlet)上传到我的 C# API。将来我想从 Android 或 iPhone 应用程序调用此 API,但我认为在任何此类设备上实现它之前我需要这部分工作。
这段 C# 代码放在我的 api:s ValuesController 中。我默认调用的控制器。我已确保(通过断点)以下方法可访问并正确调用。
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,尝试将.png发布到我的服务时出现以下错误:
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
内部异常:
它发生在以下行:
await Request.Content.ReadAsMultipartAsync(provider);
我错过了什么?感觉就像我忘记提及上述方法的 mimetype 一样。