HTML Document Extensions Methods

        public static void AddScript(this HtmlDocument htmlDocument, string javaScript)
        {
            HtmlElement head = htmlDocument.GetElementsByTagName("head")[0];
            HtmlElement scriptElement = htmlDocument.CreateElement("script");
            IHTMLScriptElement element = (IHTMLScriptElement)scriptElement.DomElement;
            element.text = javaScript;
            head.AppendChild(scriptElement);
        }

        public static void AddCSS(this HtmlDocument htmlDocument, string cssFileName)
        {
            IHTMLDocument2 currentDocument = (IHTMLDocument2)htmlDocument.DomDocument;
            int length = currentDocument.styleSheets.length;
            IHTMLStyleSheet styleSheet = currentDocument.createStyleSheet(@"", length + 1);
            using (TextReader reader = new StreamReader(cssFileName))
            {
                styleSheet.cssText = reader.ReadToEnd();
            }
        }

        public static void DoPostBack(this HtmlDocument document)
        {
            document.InvokeScript("__doPostBack");
        }

        public static void DoPostBack(this HtmlDocument document, string eventTarget, string eventArgument)
        {
            document.InvokeScript("__doPostBack", new object[] { eventTarget, eventArgument });
        }

        public static HtmlElement GetElementByTitle(this HtmlDocument document, string title)
        {
            return (from x in document.All.Cast<HtmlElement>()
                    where x.GetAttribute("title") == title
                    select x).SingleOrDefault();
        }

Extensions Methods

//Şifreleme yapmak için kullanılacak method

        public static string Encrypted(this string stringToEncrypt, string key)

        {

            try

            {

                if (string.IsNullOrEmpty(stringToEncrypt))

                    throw new ArgumentException("Bos Metin Sifrelenemez");

                if (string.IsNullOrEmpty(key))

                    throw new ArgumentException("Sifreleme Icin Anahtar Vermelisiniz");

                CspParameters cspp = new CspParameters();

                cspp.KeyContainerName = key;

                RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cspp);

                rsa.PersistKeyInCsp = true;

                byte[] bytes = rsa.Encrypt(UTF8Encoding.UTF8.GetBytes(stringToEncrypt), true);

                return BitConverter.ToString(bytes);

            }

            catch (Exception)

            {

                throw new ArgumentException("Hata Olustu");

            }

        }

Örnek:

        /// string metin = "My Secret";

        /// string sifrelenmis = metin.Encrypt("sifreleyici");

        /// string sifresicozulmus = sifrelenmis.Decrypt("sifreleyici");

// Deşifreleme yapmak için kullanılacak method

public static string Decrypt(this string stringToDecrypt, string key)

        {

            if (string.IsNullOrEmpty(stringToDecrypt))

                throw new ArgumentException("Bos Olan Metnin Sifresi Cozulemez");

            if (string.IsNullOrEmpty(key))

                throw new ArgumentException("Sifre Cozme Icin Anahtar Vermelisiniz");

            string result = null;

            try

            {

                CspParameters cspp = new CspParameters();

                cspp.KeyContainerName = key;

                RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cspp);

                rsa.PersistKeyInCsp = true;

                string[] decryptArray = stringToDecrypt.Split('-');

                byte[] decryptByteArray = Array.ConvertAll<string, byte>(decryptArray, (s => Convert.ToByte(byte.Parse(s, NumberStyles.HexNumber))));

                byte[] bytes = rsa.Decrypt(decryptByteArray, true);

                result = UTF8Encoding.UTF8.GetString(bytes);

            }

            catch (Exception)

            {

                throw new ArgumentException("Hata Olustu");

            }

            return result;

        }

Örnek:

        /// string metin = "My Secret";

        /// string sifrelenmis = metin.Encrypt("sifreleyici");

        /// string sifresicozulmus = sifrelenmis.Decrypt("sifreleyici");

// Listeler üzerinde Foreach Yapan Extension Method

public static void ForEach<T>(this IEnumerable<T> kaynak, Action<T> islem)

        {

            foreach (var item in kaynak)

                islem(item);

        }


Örnek:

        // List<string> isimler = new List<string> { "ali", "veli", "kirk", "dokuz", "elli" };

        // isimler.ForEach(isim => MessageBox.Show(isim));

// İnternet Adresi Doğrulayan Extension Method

 public static bool IsValidUrl(this string text)

        {

            Regex r = new Regex(@"http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?");

            return r.IsMatch(text);

        }

 Örnek:

        // string Adres = "http://www.ega.com.tr";

        //    bool AdresDogru = Adres.IsValidUrl();

//Email Adresi Doğrulayan Extension Method

public static bool IsValidEmail(this string text)

        {

            Regex r = new Regex(@"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$");

            return r.IsMatch(text);

        }

Örnek:

        // string adres="test@test.com";

        // bool AdresDogru=adres.IsValidEmail();

// Klasör Oluşturan Extension Method

public static void CreateDirectory(this DirectoryInfo dirInfo)

        {

            if (dirInfo.Parent != null)

                CreateDirectory(dirInfo.Parent);

            if (!dirInfo.Exists)

                dirInfo.Create();

        }

Örnek:

        // var dir=new DirectoryInfo(@"C:\temp\bir\iki\uc);

        // dir.CreateDirectory();

// Tarihin Haftasonuna Geldiğini Doğrulayan Extension Method

        public static bool IsWeekend(this DateTime value)

        {

            return (value.DayOfWeek == DayOfWeek.Sunday || value.DayOfWeek == DayOfWeek.Saturday);

        }

Örnek:

        // for(DateTime date=BaslangicTarih; date<= BitisTarih; date.AddDays(1))

        // {

        // if(date.IsWeekend())

        // continue;

// Tarihten Yaş Hesaplayan Extension Method

        public static int Age(this DateTime tarih)

        {

            DateTime now = DateTime.Now;

            int yas = now.Year - tarih.Year;

            if (now < tarih.AddYears(yas))

                yas--;

            return yas;

        }

Örnek:

        //    DateTime FatihDogumGunu = new DateTime(1979, 05, 07);

        //    int Yas = FatihDogumGunu.Age();

// Ayın İlk Gününü Bulan Extension Method

        public static DateTime FirstDayOfMonth(this DateTime date)

        {

            return new DateTime(date.Year, date.Month, 1);

        }

Örnek:

        // DateTime Simdi = DateTime.Now;

        // MessageBox.Show("Ayın ilk günü: " + Simdi.FirstDayOfMonth().ToShortDateString());

// Ayın Son Gününü Bulan Extension Method

        public static DateTime LastDayOfMonth(this DateTime date)

        {

            return new DateTime(DateTime.Now.Year, DateTime.Now.Month,1).AddMonths(1).AddDays(-1);

        }

Örnek:

        // DateTime Simdi= DateTime.Now;

        // MessageBox.Show("Ayın son günü: " + Simdi.LastDayOfMonth().ToShortDateString());

// Dosyanın MD5 Değerini Hesaplayan Extension Method

        public static string GetMD5(this string filename)

        {

            string result = string.Empty;

            try

            {

                MD5CryptoServiceProvider md5Provider = new MD5CryptoServiceProvider();

                FileStream fileStream = new FileStream(filename, FileMode.Open,                            FileAccess.Read,FileShare.ReadWrite);

                byte[] arrByteHashValue = md5Provider.ComputeHash(fileStream);

                fileStream.Close();

                string hashData = BitConverter.ToString(arrByteHashValue).Replace("-", "");

                result = hashData;

            }

            catch

            {

            }

            return result.ToLower();

        }

Örnek:

        // string Dosya = @"C:\Temp\DosyaAdi.txt";

        // MessageBox.Show(Dosya + " dosyasının MD5 değeri: " + Dosya.GetMD5());

Kaynak: http://www.enginpolat.com/