I'm trying to read my zip faster to make my foreach loop parallel.

But how can i do that based on this method?

          private async Task GetImage()
            {
                try
                {
                    PathToZip();
                    int currentIndex = GetCurrentIndex();
                    Content content = _protocol.contents[currentIndex];
                    string imageName = $"{content.contentid}.jpg";

                    using (ZipArchive archive = ZipFile.OpenRead(PathToZip()))
                    {
                        foreach (ZipArchiveEntry pictureEntry in archive.Entries)

                        {
                            if (string.Equals(pictureEntry.Name, imageName, StringComparison.OrdinalIgnoreCase))
                            {
                                //for reading the image
                                byte[] buffer;
                                long length = pictureEntry.Length;
                                buffer = new byte[length];
                                pictureEntry.Open().Read(buffer, 0, (int)length);
                                myImage.Source = ImageSource.FromStream(() => new MemoryStream(buffer));

                            }
                        }
                    }


                }
                catch (Exception)
                {
                }
            }
        

How can i do this?

Thanks in advance!

CodePudding user response：

I'm not sure what you're looking for, but here's how you can accomplish it based on your query. Keep in mind that your logic inside the foreach block must be "paralleled-ready".

Paraller.foreach (archive.Entries,(pictureEntry)=>
               {
                            if (string.Equals(pictureEntry.Name, imageName, StringComparison.OrdinalIgnoreCase))
                            {
                                //for reading the image
                                byte[] buffer;
                                long length = pictureEntry.Length;
                                buffer = new byte[length];
                                pictureEntry.Open().Read(buffer, 0, (int)length);
                                myImage.Source = ImageSource.FromStream(() => new MemoryStream(buffer));

                            }
               });

You can refer official documentation also - [1]:https://docs.microsoft.com/en-us/dotnet/standard/parallel-programming/how-to-write-a-simple-parallel-foreach-loop?redirectedfrom=MSDN