I have an Angular application, written in Typescript, with an ASP.Net Web Api backend. I am trying to use the ng-file-upload (see this link for details) directive to upload an image file.
I receive an exception in my Web API Post method:
"Unexpected end of MIME multipart stream. MIME multipart message is not complete."
I've done my research and found similar issues here - I have tried to implement Landuber Kassa's answer but without success.
Also this although my project is not MVC and in any case it did not work.
I am fresh out of ideas and would appreciate the community's thoughts. I am happy to consider any other alternatives if I can be pointed in the right direction.
Ash
My .Net Post method (implementing Landuber Kassa's idea):
[RoutePrefix("BeaufortAppStore/api/Image")]
public class ImageController : ApiController
{
#region Methods
#region Posts
[Route("UploadImage")]
[HttpPost]
public async Task<IHttpActionResult> UploadImage()
{
if (!Request.Content.IsMimeMultipartContent())
{
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
}
var provider = new MultipartMemoryStreamProvider();
Stream reqStream = Request.Content.ReadAsStreamAsync().Result;
MemoryStream tempStream = new MemoryStream();
reqStream.CopyTo(tempStream);
tempStream.Seek(0, SeekOrigin.End);
StreamWriter writer = new StreamWriter(tempStream);
writer.WriteLine();
writer.Flush();
tempStream.Position = 0;
StreamContent streamContent = new StreamContent(tempStream);
foreach (var header in Request.Content.Headers)
{
streamContent.Headers.Add(header.Key, header.Value);
}
// Read the form data and return an async task.
await streamContent.ReadAsMultipartAsync(provider); // FAILS AT THIS POINT
foreach (var file in provider.Contents)
{
var filename = file.Headers.ContentDisposition.FileName.Trim('\"');
var buffer = await file.ReadAsByteArrayAsync();
//Do whatever you want with filename and its binary data.
}
return Ok();
}
#endregion
#endregion
My angular controller method:
public upload(): void {
//Create config used in ng-file-upload
var config: IFileUploadConfigFile = {
data: this.file, url: "BeaufortAppStore/api/Image/UploadImage/", method: "POST" };
this._dataService.uploadImage(config).then((result: any) => {
this.thumbnail = result.data;
});
}
My angular view (partial view for a directive):
<div class="form-group">
<label for="file" class="control-label col-xs-2">Choose a file</label>
<input id="file" type="file" name="file" class="form-control" ngf-select ngf-pattern="'image/*'"
ng-model="vm.file" />
<img style="width:100px;" ngf-thumbnail="thumbnail || '/thumb.jpg'" />
<button type="submit" ng-click="vm.upload()">Upload</button>
