How to use httpwebrequest to pull image from website to local file

Question

I\'m trying to use a local c# app to pull some images off a website to files on my local machine. I\'m using the code listed below. I\'ve tried both ASCII encoding and UTF

Answer 1

A variation of the answer, using async await for async file I/O. See Async File I/O on why this is important.

Download png and write to disk using BinaryReader/Writer

string outFile = System.IO.Path.Combine(outDir, fileName);

// Download file
var request = (HttpWebRequest) WebRequest.Create(imageUrl);

using (var response = await request.GetResponseAsync()){
    using (var reader = new BinaryReader(response.GetResponseStream())) {

        // Read file 
        Byte[] bytes = async reader.ReadAllBytes();

        // Write to local folder 
        using (var fs = new FileStream(outFile, FileMode.Create)) {
            await fs.WriteAsync(bytes, 0, bytes.Length);
        }
    }
}

Read all bytes extension method

public static class Extensions {

    public static async Task ReadAllBytes(this BinaryReader reader)
    {
        const int bufferSize = 4096;
        using (var ms = new MemoryStream())
        {
            byte[] buffer = new byte[bufferSize];
            int count;
            while ((count = reader.Read(buffer, 0, buffer.Length)) != 0) {
                await ms.WriteAsync(buffer, 0, count);
            }
            return ms.ToArray();
        }
    }
}