HttpClient Extension Method to send image byte[] data to API

HttpClientExtensions.cs

public static class HttpClientExtensions
    {
        /// <summary>
        /// Helper method to POST binary image data to an API endpoint that expects the data to be accompanied by a parameter
        /// </summary>
        /// <param name="client">HttpClient instance</param>
        /// <param name="imageFile">Valie StorageFile of the image</param>
        /// <param name="apiUrl">The API's http or https endpoint</param>
        /// <param name="parameterName">The name of the parameter the API expects the image data in</param>
        /// <returns></returns>
        public static async Task<HttpResponseMessage> PostImageDataAsync(this HttpClient client, StorageFile imageFile, string apiUrl, string parameterName)
        {
            if (client == null)
                throw new ArgumentNullException(nameof(client), "HttpClient was null");

            if (string.IsNullOrEmpty(apiUrl))
                throw new ArgumentNullException(nameof(apiUrl), "You must set a URL for the API endpoint");

            if (imageFile == null)
                throw new ArgumentNullException(nameof(imageFile), "You must have a valid StorageFile for this method to work");

            if (string.IsNullOrEmpty(parameterName))
                throw new ArgumentNullException(nameof(parameterName), "You must set a parameter name for the image data");

            try
            {
                byte[] fileBytes = null;
                using (var fileStream = await imageFile.OpenStreamForReadAsync())
                {
                    var binaryReader = new BinaryReader(fileStream);
                    fileBytes = binaryReader.ReadBytes((int)fileStream.Length);
                }

                var multipartContent = new MultipartFormDataContent();
                multipartContent.Add(new ByteArrayContent(fileBytes), parameterName);
                return await client.PostAsync(new Uri(apiUrl), multipartContent);

            }
            catch (Exception ex)
            {
                throw ex; //do whatever make sense in your app (ie. log it, show it to the user, etc.)
            }
        }
    }