Cannot convert from system.threading.tasks.task <byte[]> to byte[]

Question

User931778073 posted

I am following a tutorial on uploading files using Web API 2 from an article on the website https://chris.59north.com/post/Uploading-files-using-ASPNET-Web-Api  . I followed every thing as shown in the article but I'm getting the error "Cannot convert from system.threading.tasks.task <string> to string" on the line

"files.Add(fieldName, new HttpPostedFile(fieldName, fileName, file));"

Please look at my code below and help point out why I'm getting this error.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using System.Web;

namespace CanvasModifyier.Extensions
{
    public static class HttpContentExtensions
    {
        public static async Task<HttpPostedData> ParseMultipartAsync(this HttpContent postedContent) {

            //Get Content
            var provider = await postedContent.ReadAsMultipartAsync();

            //Create two dictionaries
            var files = new Dictionary<string, HttpPostedFile>(StringComparer.InvariantCultureIgnoreCase);
            var fields = new Dictionary<string, HttpPostedField>(StringComparer.InvariantCultureIgnoreCase);

            //Sort Content into files and fields
            foreach (var content in provider.Contents)
            {
                var fieldName = content.Headers.ContentDisposition.Name.Trim('"');

                //Has a Filename, so it must be a file
                if (!string.IsNullOrEmpty(content.Headers.ContentDisposition.FileName)) {
                    var file = content.ReadAsByteArrayAsync();
                    var fileName = content.Headers.ContentDisposition.FileName.Trim('"');
                    files.Add(fieldName, new HttpPostedFile(fieldName, fileName, file));
                }
                else
                {
                    var data = content.ReadAsStringAsync();
                    
                    fields.Add(fieldName, new HttpPostedField(fieldName, data));
                }                
            }
            return new HttpPostedData(fields, files);
        }
    }
    public class HttpPostedData
    {
        public HttpPostedData(IDictionary<string, HttpPostedField> fields, IDictionary<string, HttpPostedFile> files)
        {
            Fields = fields;
            Files = files;
        }
        public IDictionary<string, HttpPostedField> Fields { get; private set; }
        public IDictionary<string, HttpPostedFile> Files { get; private set; }
    }

    public class HttpPostedField
    {
        public HttpPostedField(string name, string value)
        {
            Name = name;
            Value = value;
        }
        public string Name { get; private set; }
        public string Value { get; private set; }
    }

    public class HttpPostedFile
    {
       
        public HttpPostedFile(string name, string filename, byte[] file)
        {
            Name = name;
            Filename = filename;
            File = file;
        }
        public string Name { get; private set; }
        public string Filename { get; private set; }
        public byte[] File { get; private set; }
    }
}

Answer 1

User303363814 posted

You've missed the 'await'

var file = await content.ReadAsByteArrayAsync();

Answer 2

User931778073 posted

Thanks for your help, that was one of the causes of the error. The other was I was missing the await keyword in the following line as well:

var data = content.ReadAsStringAsync();