添加项目文件。

QYZH.InteractiveMagazine.Common/Extensions/StringExtension.cs

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+using System;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace QYZH.InteractiveMagazine.Common.Extensions
+{
+    /// <summary>
+    /// 字符串扩展方法
+    /// </summary>
+    public static class StringExtension
+    {
+        /// <summary>
+        /// MD5加密
+        /// </summary>
+        /// <param name="input">原始字符串</param>
+        /// <returns>MD5哈希值(32位小写)</returns>
+        public static string ToMd5(this string input)
+        {
+            if (string.IsNullOrEmpty(input))
+            {
+                return string.Empty;
+            }
+
+            using (var md5 = MD5.Create())
+            {
+                byte[] bytes = md5.ComputeHash(Encoding.UTF8.GetBytes(input));
+                var sb = new StringBuilder();
+                foreach (byte b in bytes)
+                {
+                    sb.Append(b.ToString("x2"));
+                }
+                return sb.ToString();
+            }
+        }
+
+        /// <summary>
+        /// SHA256加密
+        /// </summary>
+        /// <param name="input">原始字符串</param>
+        /// <returns>SHA256哈希值(64位小写)</returns>
+        public static string ToSha256(this string input)
+        {
+            if (string.IsNullOrEmpty(input))
+            {
+                return string.Empty;
+            }
+
+            using (var sha256 = SHA256.Create())
+            {
+                byte[] bytes = sha256.ComputeHash(Encoding.UTF8.GetBytes(input));
+                var sb = new StringBuilder();
+                foreach (byte b in bytes)
+                {
+                    sb.Append(b.ToString("x2"));
+                }
+                return sb.ToString();
+            }
+        }
+
+        /// <summary>
+        /// Base64编码
+        /// </summary>
+        /// <param name="input">原始字符串</param>
+        /// <returns>Base64编码后的字符串</returns>
+        public static string ToBase64(this string input)
+        {
+            if (string.IsNullOrEmpty(input))
+            {
+                return string.Empty;
+            }
+
+            byte[] bytes = Encoding.UTF8.GetBytes(input);
+            return Convert.ToBase64String(bytes);
+        }
+
+        /// <summary>
+        /// Base64解码
+        /// </summary>
+        /// <param name="input">Base64编码的字符串</param>
+        /// <returns>解码后的原始字符串</returns>
+        public static string FromBase64(this string input)
+        {
+            if (string.IsNullOrEmpty(input))
+            {
+                return string.Empty;
+            }
+
+            byte[] bytes = Convert.FromBase64String(input);
+            return Encoding.UTF8.GetString(bytes);
+        }
+
+        /// <summary>
+        /// 判断字符串是否为空或空白
+        /// </summary>
+        /// <param name="input">待检查的字符串</param>
+        /// <returns>是否为空或空白</returns>
+        public static bool IsNullOrWhiteSpace(this string input)
+        {
+            return string.IsNullOrWhiteSpace(input);
+        }
+
+        /// <summary>
+        /// 手机号脱敏
+        /// </summary>
+        /// <param name="phone">手机号</param>
+        /// <returns>脱敏后的手机号(中间4位用*替换)</returns>
+        public static string MaskPhone(this string phone)
+        {
+            if (string.IsNullOrEmpty(phone) || phone.Length < 7)
+            {
+                return phone;
+            }
+
+            return phone.Substring(0, 3) + "****" + phone.Substring(phone.Length - 4);
+        }
+
+        /// <summary>
+        /// 身份证脱敏
+        /// </summary>
+        /// <param name="idCard">身份证号</param>
+        /// <returns>脱敏后的身份证号(保留前3位和后4位)</returns>
+        public static string MaskIdCard(this string idCard)
+        {
+            if (string.IsNullOrEmpty(idCard) || idCard.Length < 7)
+            {
+                return idCard;
+            }
+
+            int length = idCard.Length;
+            return idCard.Substring(0, 3) + new string('*', length - 7) + idCard.Substring(length - 4);
+        }
+
+        /// <summary>
+        /// 正则匹配
+        /// </summary>
+        /// <param name="input">待匹配的字符串</param>
+        /// <param name="pattern">正则表达式</param>
+        /// <returns>是否匹配</returns>
+        public static bool IsMatchRegex(this string input, string pattern)
+        {
+            if (string.IsNullOrEmpty(input) || string.IsNullOrEmpty(pattern))
+            {
+                return false;
+            }
+
+            return Regex.IsMatch(input, pattern);
+        }
+    }
+}