diff --git a/Masuit.Tools.Core/Masuit.Tools.Core.csproj b/Masuit.Tools.Core/Masuit.Tools.Core.csproj
index 6abd72f..94fd1f4 100644
--- a/Masuit.Tools.Core/Masuit.Tools.Core.csproj
+++ b/Masuit.Tools.Core/Masuit.Tools.Core.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.1</TargetFramework>
-    <Version>2.2.8.6</Version>
+    <Version>2.2.8.7</Version>
     <Authors>懒得勤快</Authors>
     <Company>masuit.com</Company>
     <Description>包含一些常用的操作类，大都是静态类，加密解密，反射操作，硬件信息，字符串扩展方法，日期时间扩展操作，大文件拷贝，图像裁剪，html处理，验证码、NoSql等常用封装。
diff --git a/Masuit.Tools/Extensions.cs b/Masuit.Tools/Extensions.cs
index 2a7ba36..a168183 100644
--- a/Masuit.Tools/Extensions.cs
+++ b/Masuit.Tools/Extensions.cs
@@ -1280,10 +1280,43 @@ namespace Masuit.Tools
         /// <param name="where"></param>
         public static void RemoveWhere<T>(this ICollection<T> @this, Func<T, bool> @where)
         {
-            foreach (var obj in @this.Where(@where).ToList())
+            foreach (var obj in @this.Where(where).ToList())
             {
                 @this.Remove(obj);
             }
         }
+
+        /// <summary>
+        /// 字符串掩码
+        /// </summary>
+        /// <param name="s">字符串</param>
+        /// <param name="mask">掩码符</param>
+        /// <returns></returns>
+        public static string Mask(this string s, char mask = '*')
+        {
+            if (string.IsNullOrWhiteSpace(s?.Trim()))
+            {
+                return s;
+            }
+            s = s.Trim();
+            string masks = new string(new[] { mask, mask, mask, mask });
+            return s.Length switch
+            {
+                _ when s.Length > 4 => Regex.Replace(s, "(\\w{3})\\w+(\\w{4})", $"$1{masks}$2"),
+                _ when s.Length >= 2 && s.Length <= 4 => Regex.Replace(s, "(\\w{1})\\w*(\\w{1})", $"$1{masks}$2"),
+                _ => s + masks
+            };
+        }
+
+        /// <summary>
+        /// 邮箱掩码
+        /// </summary>
+        /// <param name="s">邮箱</param>
+        /// <param name="mask">掩码</param>
+        /// <returns></returns>
+        public static string MaskEmail(this string s, char mask = '*')
+        {
+            return !MatchEmail(s) ? s : s.Replace(s.Substring(0, s.LastIndexOf("@")), Mask(s.Substring(0, s.LastIndexOf("@")), mask));
+        }
     }
 }
\ No newline at end of file
diff --git a/Masuit.Tools/Properties/AssemblyInfo.cs b/Masuit.Tools/Properties/AssemblyInfo.cs
index e6b2e3f..f18792d 100644
Binary files a/Masuit.Tools/Properties/AssemblyInfo.cs and b/Masuit.Tools/Properties/AssemblyInfo.cs differ
diff --git a/Masuit.Tools/package.nuspec b/Masuit.Tools/package.nuspec
index 8ef2a5b..69551e7 100644
--- a/Masuit.Tools/package.nuspec
+++ b/Masuit.Tools/package.nuspec
@@ -4,7 +4,7 @@
     <!--*-->
     <id>Masuit.Tools.Net</id>
     <!--*-->
-    <version>2.2.8.5</version>
+    <version>2.2.8.7</version>
     <title>Masuit.Tools</title>
     <!--*-->
     <authors>masuit.com</authors>