iOS Asihttp上传文件（图片等）以及服务端的代码（c#,.net Web api2）

NSString *api = @"http://192.168.20.189:6900/bk/api/upload";
ASIFormDataRequest *req = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:api]];
[req setRequestMethod:@"POST"];

//    NSString *imgPath = @"/Users/duanhai/Desktop/test.png";
NSString *path = [[NSBundle mainBundle] pathForResource:@"test" ofType:@".png"];
//  NSData *image = [[NSData alloc] initWithContentsOfFile:path];
//    [req addData:image withFileName:@"test.png" andContentType:@"image/jpeg" forKey:@"image"];
[req setFile:path forKey:@"whatever"];
[req setCompletionBlock:^{
NSLog(@"xxxx is %@ and err is %@",req.responseString,req.error);
}];
[req setFailedBlock:^{
NSLog(@"err code is %@",[req.error localizedDescription]);
}];
[req startAsynchronous];

 [RoutePrefix("api/upload")]public class UploadController : ApiController{public HttpResponseMessage Post(){HttpResponseMessage result = null;var httpRequest = HttpContext.Current.Request;if (httpRequest.Files.Count > 0){var docfiles = new List<string>();foreach (string file in httpRequest.Files){var postedFile = httpRequest.Files[file];// var filePath = HttpContext.Current.Server.MapPath("~/" + postedFile.FileName);var filePath = "C:/Users/Tony_mac/Desktop/upload/"+postedFile.FileName;postedFile.SaveAs(filePath);docfiles.Add(filePath);}result = Request.CreateResponse(HttpStatusCode.Created, docfiles);}else{result = Request.CreateResponse(HttpStatusCode.BadRequest);}return result;}}