UpdateCore.cs

using System.IO;
using System.Net;
using Azyobuzi.Azyotter.Util;
using Ionic.Zip;

namespace Azyobuzi.Azyotter.Updater
{
    public static class UpdateCore
    {
        public static string Download(Update update)
        {
            var tmpFile = Path.GetTempFileName();
            using (var wc = new WebClient())
            {
                wc.Headers.Add(HttpRequestHeader.UserAgent, "Azyotter.Updater v" + AssemblyUtil.GetInformationalVersion());
                wc.DownloadFile(update.Uri, tmpFile);
            }
            return tmpFile;
        }

        public static void Apply(string zipFile, string targetDir)
        {
            using (var zip = ZipFile.Read(zipFile))
            {
                zip.ExtractAll(targetDir, ExtractExistingFileAction.OverwriteSilently);
            }
        }
    }
}