string字符串扩展

/// <summary>
    /// 
    /// </summary>
    public static class StringExtentions
    {
        /// <summary>
        /// 转换为MD5加密后的字符串（默认加密为32位）
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string ToMD5String(this string str)
        {
            MD5 md5 = MD5.Create();
            byte[] inputBytes = Encoding.UTF8.GetBytes(str);
            byte[] hashBytes = md5.ComputeHash(inputBytes);

            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hashBytes.Length; i++)
            {
                sb.Append(hashBytes[i].ToString("x2"));
            }
            md5.Dispose();

            return sb.ToString();
        }

        /// <summary>
        /// 转换为MD5加密后的字符串（16位）
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string ToMD5String16(this string str)
        {
            return str.ToMD5String().Substring(8, 16);
        }

        /// <summary>
        /// Base64加密
        /// 注:默认采用UTF8编码
        /// </summary>
        /// <param name="source">待加密的明文</param>
        /// <returns>加密后的字符串</returns>
        public static string Base64Encode(this string source)
        {
            return Base64Encode(source, Encoding.UTF8);
        }

        /// <summary>
        /// Base64加密
        /// </summary>
        /// <param name="source">待加密的明文</param>
        /// <param name="encoding">加密采用的编码方式</param>
        /// <returns></returns>
        public static string Base64Encode(this string source, Encoding encoding)
        {
            string encode = string.Empty;
            byte[] bytes = encoding.GetBytes(source);
            try
            {
                encode = Convert.ToBase64String(bytes);
            }
            catch
            {
                encode = source;
            }
            return encode;
        }

        /// <summary>
        /// Base64解密
        /// 注:默认使用UTF8编码
        /// </summary>
        /// <param name="result">待解密的密文</param>
        /// <returns>解密后的字符串</returns>
        public static string Base64Decode(this string result)
        {
            return Base64Decode(result, Encoding.UTF8);
        }

        /// <summary>
        /// Base64解密
        /// </summary>
        /// <param name="result">待解密的密文</param>
        /// <param name="encoding">解密采用的编码方式，注意和加密时采用的方式一致</param>
        /// <returns>解密后的字符串</returns>
        public static string Base64Decode(this string result, Encoding encoding)
        {
            string decode = string.Empty;
            byte[] bytes = Convert.FromBase64String(result);
            try
            {
                decode = encoding.GetString(bytes);
            }
            catch
            {
                decode = result;
            }
            return decode;
        }

        /// <summary>
        /// Base64Url编码
        /// </summary>
        /// <param name="text">待编码的文本字符串</param>
        /// <returns>编码的文本字符串</returns>
        public static string Base64UrlEncode(this string text)
        {
            var plainTextBytes = Encoding.UTF8.GetBytes(text);
            var base64 = Convert.ToBase64String(plainTextBytes).Replace('+', '-').Replace('/', '_').TrimEnd('=');

            return base64;
        }

        /// <summary>
        /// Base64Url解码
        /// </summary>
        /// <param name="base64UrlStr">使用Base64Url编码后的字符串</param>
        /// <returns>解码后的内容</returns>
        public static string Base64UrlDecode(this string base64UrlStr)
        {
            base64UrlStr = base64UrlStr.Replace('-', '+').Replace('_', '/');
            switch (base64UrlStr.Length % 4)
            {
                case 2:
                    base64UrlStr += "==";
                    break;
                case 3:
                    base64UrlStr += "=";
                    break;
            }
            var bytes = Convert.FromBase64String(base64UrlStr);

            return Encoding.UTF8.GetString(bytes);
        }

        /// <summary>
        /// 计算SHA1摘要
        /// 注：默认使用UTF8编码
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns></returns>
        public static byte[] ToSHA1Bytes(this string str)
        {
            return str.ToSHA1Bytes(Encoding.UTF8);
        }

        /// <summary>
        /// 计算SHA1摘要
        /// </summary>
        /// <param name="str">字符串</param>
        /// <param name="encoding">编码</param>
        /// <returns></returns>
        public static byte[] ToSHA1Bytes(this string str, Encoding encoding)
        {
            SHA1 sha1 = new SHA1CryptoServiceProvider();
            byte[] inputBytes = encoding.GetBytes(str);
            byte[] outputBytes = sha1.ComputeHash(inputBytes);

            return outputBytes;
        }

        /// <summary>
        /// 转为SHA1哈希加密字符串
        /// 注：默认使用UTF8编码
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns></returns>
        public static string ToSHA1String(this string str)
        {
            return str.ToSHA1String(Encoding.UTF8);
        }

        /// <summary>
        /// 转为SHA1哈希
        /// </summary>
        /// <param name="str">字符串</param>
        /// <param name="encoding">编码</param>
        /// <returns></returns>
        public static string ToSHA1String(this string str, Encoding encoding)
        {
            byte[] sha1Bytes = str.ToSHA1Bytes(encoding);
            string resStr = BitConverter.ToString(sha1Bytes);
            return resStr.Replace("-", "").ToLower();
        }

        /// <summary>
        /// SHA256加密
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns></returns>
        public static string ToSHA256String(this string str)
        {
            byte[] bytes = Encoding.UTF8.GetBytes(str);
            byte[] hash = SHA256.Create().ComputeHash(bytes);

            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < hash.Length; i++)
            {
                builder.Append(hash[i].ToString("x2"));
            }

            return builder.ToString();
        }

        /// <summary>
        /// HMACSHA256算法
        /// </summary>
        /// <param name="text">内容</param>
        /// <param name="secret">密钥</param>
        /// <returns></returns>
        public static string ToHMACSHA256String(this string text, string secret)
        {
            secret = secret ?? "";
            byte[] keyByte = Encoding.UTF8.GetBytes(secret);
            byte[] messageBytes = Encoding.UTF8.GetBytes(text);
            using (var hmacsha256 = new HMACSHA256(keyByte))
            {
                byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
                return Convert.ToBase64String(hashmessage).Replace('+', '-').Replace('/', '_').TrimEnd('=');
            }
        }

        /// <summary>
        /// string转int
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns></returns>
        public static int ToInt(this string str)
        {
            str = str.Replace("\0", "");
            if (string.IsNullOrEmpty(str))
                return 0;
            return Convert.ToInt32(str);
        }

        /// <summary>
        /// string转long
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns></returns>
        public static long ToLong(this string str)
        {
            str = str.Replace("\0", "");
            if (string.IsNullOrEmpty(str))
                return 0;

            return Convert.ToInt64(str);
        }

        /// <summary>
        /// 二进制字符串转为Int
        /// </summary>
        /// <param name="str">二进制字符串</param>
        /// <returns></returns>
        public static int ToInt_FromBinString(this string str)
        {
            return Convert.ToInt32(str, 2);
        }

        /// <summary>
        /// 将16进制字符串转为Int
        /// </summary>
        /// <param name="str">数值</param>
        /// <returns></returns>
        public static int ToInt0X(this string str)
        {
            int num = Int32.Parse(str, NumberStyles.HexNumber);
            return num;
        }

        /// <summary>
        /// 转换为double
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns></returns>
        public static double ToDouble(this string str)
        {
            return Convert.ToDouble(str);
        }

        /// <summary>
        /// string转byte[]
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns></returns>
        public static byte[] ToBytes(this string str)
        {
            return Encoding.Default.GetBytes(str);
        }

        /// <summary>
        /// string转byte[]
        /// </summary>
        /// <param name="str">字符串</param>
        /// <param name="theEncoding">需要的编码</param>
        /// <returns></returns>
        public static byte[] ToBytes(this string str, Encoding theEncoding)
        {
            return theEncoding.GetBytes(str);
        }

        /// <summary>
        /// 将16进制字符串转为Byte数组
        /// </summary>
        /// <param name="str">16进制字符串(2个16进制字符表示一个Byte)</param>
        /// <returns></returns>
        public static byte[] To0XBytes(this string str)
        {
            List<byte> resBytes = new List<byte>();
            for (int i = 0; i < str.Length; i = i + 2)
            {
                string numStr = $@"{str[i]}{str[i + 1]}";
                resBytes.Add((byte)numStr.ToInt0X());
            }

            return resBytes.ToArray();
        }

        /// <summary>
        /// 将ASCII码形式的字符串转为对应字节数组
        /// 注：一个字节一个ASCII码字符
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns></returns>
        public static byte[] ToASCIIBytes(this string str)
        {
            return str.ToList().Select(x => (byte)x).ToArray();
        }

        /// <summary>
        /// 转为网络终结点IPEndPoint
        /// </summary>=
        /// <param name="str">字符串</param>
        /// <returns></returns>
        public static IPEndPoint ToIPEndPoint(this string str)
        {
            IPEndPoint iPEndPoint = null;
            try
            {
                string[] strArray = str.Split(':').ToArray();
                string addr = strArray[0];
                int port = Convert.ToInt32(strArray[1]);
                iPEndPoint = new IPEndPoint(IPAddress.Parse(addr), port);
            }
            catch
            {
                iPEndPoint = null;
            }

            return iPEndPoint;
        }

        /// <summary>
        /// 将枚举类型的文本转为枚举类型
        /// </summary>
        /// <typeparam name="TEnum">枚举类型</typeparam>
        /// <param name="enumText">枚举文本</param>
        /// <returns></returns>
        public static TEnum ToEnum<TEnum>(this string enumText) where TEnum : struct
        {
            Enum.TryParse(enumText, out TEnum value);

            return value;
        }

        /// <summary>
        /// 是否为弱密码
        /// 注:密码必须包含数字、小写字母、大写字母和其他符号中的两种并且长度大于8
        /// </summary>
        /// <param name="pwd">密码</param>
        /// <returns></returns>
        public static bool IsWeakPwd(this string pwd)
        {
            if (pwd.IsNullOrEmpty())
                throw new Exception("pwd不能为空");

            string pattern = "(^[0-9]+$)|(^[a-z]+$)|(^[A-Z]+$)|(^.{0,8}$)";
            if (Regex.IsMatch(pwd, pattern))
                return true;
            else
                return false;
        }

        /// <summary>
        /// 获取字符串中的所有邮件地址并转为小写
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public static List<string> GetEmailAddress(this string text)
        {
            string pattern = "([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\\.[a-zA-Z0-9_-]+)";

            return Regex.Matches(text, pattern).Cast<Match>().Select(x => x.Groups[0].ToString().ToLower()).ToList();
        }

        private static readonly Encoding _utf8Encoder = Encoding.GetEncoding(
            "UTF-8",
            new EncoderReplacementFallback(string.Empty),
            new DecoderExceptionFallback()
        );
        /// <summary>
        /// 移除非utf8字符
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string RemoveNotUtf8(this string str)
        {
            return _utf8Encoder.GetString(_utf8Encoder.GetBytes(str));
        }

        /// <summary>
        /// RSA SHA256签名
        /// </summary>
        /// <param name="str">字符串</param>
        /// <param name="privateKey">私钥(PKCS1 若是JAVA的PKCS8则需要使用RSAPrivateKeyJavaToDotNet转换)</param>
        /// <returns></returns>
        public static string RSASign(string str, string privateKey)
        {
            //根据需要加签时的哈希算法转化成对应的hash字符节
            byte[] bt = Encoding.GetEncoding("utf-8").GetBytes(str);
            var sha256 = new SHA256CryptoServiceProvider();
            byte[] rgbHash = sha256.ComputeHash(bt);
            RSACryptoServiceProvider key = new RSACryptoServiceProvider();
            key.FromXmlString(privateKey);
            RSAPKCS1SignatureFormatter formatter = new RSAPKCS1SignatureFormatter(key);
            formatter.SetHashAlgorithm("SHA256"); //此处是你需要加签的hash算法，需要和上边你计算的hash值的算法一致，不然会报错。
            byte[] inArray = formatter.CreateSignature(rgbHash);
            return Convert.ToBase64String(inArray);
        }

        /// <summary>    
        /// RSA私钥格式转换，java 2 .net    
        /// </summary>    
        /// <param name="privateKey">java生成的RSA私钥</param>    
        /// <returns></returns>  
        public static string RSAPrivateKeyJavaToDotNet(string privateKey)
        {
            RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));
            return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
              Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
              Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
              Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
              Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
              Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),
              Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),
              Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),
              Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));
        }
    }