010203

HostingEnvironment.QueueBackgroundWorkItem(cT => {    /* Implementierung der Aufgabe */});

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public static class TaskUtility {    public static void DoBackgroundWork(        Action<CancellationToken> action,        CancellationToken cancellationToken = default(CancellationToken)    ) {        if(HostingEnvironment.IsHosted) {            HostingEnvironment.QueueBackgroundWorkItem(action);        } else {            Task.Run(() => action(cancellationToken), cancellationToken);        }    }}

010203

TaskUtility.DoBackgroundWork(cT => {    /* Implementierung der Aufgabe */});

01

ZipFile.CreateFromDirectory("data", "data.zip");

010203040506

using(FileStream fileStream = File.OpenWrite("data.zip")) {    using(ZipArchive zipArchive = new ZipArchive(fileStream, ZipArchiveMode.Create)) {        zipArchive.CreateEntryFromFile("data/a.txt", "a.txt");        zipArchive.CreateEntryFromFile("data/b.txt", "b.txt");    }}

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using(FileStream fileStream = File.OpenWrite("data.zip")) {    using(ZipArchive zipArchive = new ZipArchive(fileStream, ZipArchiveMode.Create)) {        ZipArchiveEntry zipArchiveEntry = zipArchive.CreateEntry("README");
        using(StreamWriter streamWriter = new StreamWriter(zipArchiveEntry.Open())) {            streamWriter.Write("Hallo Welt!");        }    }}

01

ZipFile.ExtractToDirectory("data.zip", "data");

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using(FileStream fileStream = File.OpenRead("data.zip")) {    using(ZipArchive zipArchive = new ZipArchive(fileStream, ZipArchiveMode.Read)) {        foreach(ZipArchiveEntry zipArchiveEntry in zipArchive.Entries) {              // "README" separat berücksichtigen            if(zipArchiveEntry.Name == "README") {                using(StreamReader streamReader = new StreamReader(zipArchiveEntry.Open())) {                      // Inhalt einlesen und auf Konsole ausgeben                    Console.WriteLine(streamReader.ReadToEnd());                }            } else {                  // Eintrag als Datei speichern                zipArchiveEntry.ExtractToFile(zipArchiveEntry.Name);            }        }    }}

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public static IEnumerable<string> GetAbuseContactList(params string[] domainList) {    using(TcpClient client = new TcpClient("whois.abuse.net", 43)) {        using(NetworkStream stream = client.GetStream()) {            byte[] request = Encoding.UTF8.GetBytes(String.Join(" ", domainList) + "\r\n");            stream.Write(request, 0, request.Length);
            using(StreamReader streamReader = new StreamReader(stream)) {                while(!streamReader.EndOfStream) {                    string response = streamReader.ReadLine();
                    if(response.Contains("(")) {                        response = response.Substring(0, response.IndexOf('('));                    }
                    if(!String.IsNullOrWhiteSpace(response)) {                        yield return response.Trim();                    }                }            }        }    }}

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public static IEnumerable<string> GetAbuseContactList(params string[] domainList) {    foreach(string domain in domainList) {        DnsMessage response = DnsClient.Default.Resolve(            DomainName.Parse(domain + ".contacts.abuse.net"),            RecordType.Txt        );
        foreach(TxtRecord record in response.AnswerRecords) {            yield return record.TextData;        }    }}

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  // ["abuse@coders-online.net"]IEnumerable<string> abuseContactList = GetAbuseContactList("coders-online.net");
  // ["abuse@google.com", "abuse@microsoft.de"]abuseContactList = GetAbuseContactList("google.com", "microsoft.de");
  // ["abuse@facebook.com", "spamreport@spamreport.facebook.com"]abuseContactList = GetAbuseContactList("facebook.com");