Xamarin Upload Files by WebAPI (Asp.Net Framework)

WebApi Code

public IHttpActionResult UploadFiles()
{
  try
  {
      var request = HttpContext.Current.Request;

      if (request.Files.Count <= 0)
      {
          return StatusCode(HttpStatusCode.NoContent);
      }
      //Define files storage location
      string basePath = AppDomain.CurrentDomain.BaseDirectory + "Uploads\";
      if (!Directory.Exists(basePath))
      {
          Directory.CreateDirectory(basePath);
      }
      for (int i = 0; i < request.Files.Count; i++)
      {
          try
          {
              var file = request.Files[i];
              file.SaveAs(basePath + file.FileName);
          }
          catch (Exception ex)
          {

          }
      }
      return Ok();

  }
  catch (Exception ex)
  {
      return BadRequest();
  }
}

Xamarin Code

private async void Upload_Click(object sender, EventArgs e)
{
    try
    {
        if (SelectedFiles == null)
        {
            return;
        }
        //MultipartFormDataContent  : support select multiple files
        MultipartFormDataContent contents = new MultipartFormDataContent();

        //foreach the selected files and add it to contents
        foreach (var item in SelectedFiles)
        {
            //File Content(Stream) , name , FileName 
            contents.Add(new StreamContent(await item.OpenReadAsync()), "file", DateTime.Now.ToString("yyyyMMddHHmmss") + item.FileName);
        }
        //Post，Pass contents to WebApi
        var rs = await new HttpClient().PostAsync("UploadFiles", contents);

        //Verify reulst after WebApi processing
        if (rs .IsSuccessStatusCode)
        {
            await DisplayAlert("Tips","Success!","OK");
        }else
            await DisplayAlert("Tips","Error!","OK");
    }
    catch (Exception ex)
    {

    }
}

Xamarin Select File Code

public IEnumerable<FileResult> SelectedFiles { get; set; }
public async void SelectFiles()
{
  //Select Multiple Files ,The File Type is Image
  SelectedFiles = await FilePicker.PickMultipleAsync(PickOptions.Images);
}