How to setup a webapi controller for multipart/form-data

问题:

I am trying to figure out how to get this done. I was not getting any useful error messages with my code so I used something else to generate something. I have attached that code after the error message. I have found a tutorial on it but I do not know how to implement it with what I have. This is what i currently have

public async Task

error

Object {message: "The request entity's media type 'multipart/form-data' is not supported for this resource.", exceptionMessage: "No MediaTypeFormatter is available to read an obje…om content with media type 'multipart/form-data'.", exceptionType: "System.Net.Http.UnsupportedMediaTypeException", stackTrace: " at System.Net.Http.HttpContentExtensions.ReadAs…atterLogger, CancellationToken cancellationToken)"}exceptionMessage: "No MediaTypeFormatter is available to read an object of type 'HttpPostedFileBase' from content with media type 'multipart/form-data'."exceptionType: "System.Net.Http.UnsupportedMediaTypeException"message: "The request entity's media type 'multipart/form-data' is not supported for this resource."stackTrace: " at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)

Code used to generate error message

    [HttpPost]     public string UploadFile(HttpPostedFileBase file)     {          if (file.ContentLength > 0)         {             var fileName = Path.GetFileName(file.FileName);             var path = Path.Combine(HttpContext.Current.Server.MapPath("~/uploads"), fileName);             file.SaveAs(path);           }         return "/uploads/" + file.FileName;     } 

class

public class File {     public int FileId { get; set; }     public string FileType { get; set; }     public string FileDate { get; set; }     public byte[] FilePdf { get; set; }     public string FileLocation { get; set; }     public string FilePlant { get; set; }     public string FileTerm { get; set; }     public DateTime? FileUploadDate { get; set; }     public string FileUploadedBy { get; set; }      public string CompanyName { get; set; }     public virtual ApplicationUser User { get; set; } } 

回答1:

I normally use the HttpPostedFileBase parameter only in Mvc Controllers. When dealing with ApiControllers try checking the HttpContext.Current.Request.Files property for incoming files instead:

[HttpPost] public string UploadFile() {     var file = HttpContext.Current.Request.Files.Count > 0 ?         HttpContext.Current.Request.Files[0] : null;      if (file != null && file.ContentLength > 0)     {         var fileName = Path.GetFileName(file.FileName);          var path = Path.Combine(             HttpContext.Current.Server.MapPath("~/uploads"),             fileName         );          file.SaveAs(path);     }      return file != null ? "/uploads/" + file.FileName : null; } 

回答2:

You can use something like this

[HttpPost] public async Task AddFile() {     if (!Request.Content.IsMimeMultipartContent())     {         this.Request.CreateResponse(HttpStatusCode.UnsupportedMediaType);     }      string root = HttpContext.Current.Server.MapPath("~/temp/uploads");     var provider = new MultipartFormDataStreamProvider(root);     var result = await Request.Content.ReadAsMultipartAsync(provider);      foreach (var key in provider.FormData.AllKeys)     {         foreach (var val in provider.FormData.GetValues(key))         {             if (key == "companyName")             {                 var companyName = val;             }         }     }      // On upload, files are given a generic name like "BodyPart_26d6abe1-3ae1-416a-9429-b35f15e6e5d5"     // so this is how you can get the original file name     var originalFileName = GetDeserializedFileName(result.FileData.First());      var uploadedFileInfo = new FileInfo(result.FileData.First().LocalFileName);     string path = result.FileData.First().LocalFileName;      //Do whatever you want to do with your file here      return this.Request.CreateResponse(HttpStatusCode.OK, originalFileName ); }  private string GetDeserializedFileName(MultipartFileData fileData) {     var fileName = GetFileName(fileData);     return JsonConvert.DeserializeObject(fileName).ToString(); }  public string GetFileName(MultipartFileData fileData) {     return fileData.Headers.ContentDisposition.FileName; } 

回答3:

This is what solved my problem
Add the following line to WebApiConfig.cs

config.Formatters.XmlFormatter.SupportedMediaTypes.Add(new System.Net.Http.Headers.MediaTypeHeaderValue("multipart/form-data")); 

回答4:

check ur WebApiConfig and add this

GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear(); 

回答5:

You're getting HTTP 415 "The request entity's media type 'multipart/form-data' is not supported for this resource." because you haven't mention the correct content type in your request.

文章来源: How to setup a webapi controller for multipart/form-data