diff --git a/src/NSExt/ByteExtensions.cs b/src/NSExt/ByteExtensions.cs
index 592dbaf..3488282 100644
--- a/src/NSExt/ByteExtensions.cs
+++ b/src/NSExt/ByteExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: ByteExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-using System.Text;
+using System.Text;
 
 namespace NSExt;
 
diff --git a/src/NSExt/DateTimeExtensions.cs b/src/NSExt/DateTimeExtensions.cs
index 2d25d42..7827595 100644
--- a/src/NSExt/DateTimeExtensions.cs
+++ b/src/NSExt/DateTimeExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: DateTimeExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-// ReSharper disable UnusedMember.Global
+// ReSharper disable UnusedMember.Global
 
 namespace NSExt;
 
diff --git a/src/NSExt/DbCommandExtensions.cs b/src/NSExt/DbCommandExtensions.cs
index 7407223..b8abc6c 100644
--- a/src/NSExt/DbCommandExtensions.cs
+++ b/src/NSExt/DbCommandExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: DbCommandExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 08/06/2022 19:48
-
-using System.Data;
+using System.Data;
 using System.Data.Common;
 
 namespace NSExt;
diff --git a/src/NSExt/DecimalExtensions.cs b/src/NSExt/DecimalExtensions.cs
index 8bef4ff..1c392b7 100644
--- a/src/NSExt/DecimalExtensions.cs
+++ b/src/NSExt/DecimalExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: DecimalExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-namespace NSExt;
+namespace NSExt;
 
 public static class DecimalExtensions
 {
diff --git a/src/NSExt/EnumExtensions.cs b/src/NSExt/EnumExtensions.cs
index bf689af..e85e298 100644
--- a/src/NSExt/EnumExtensions.cs
+++ b/src/NSExt/EnumExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: EnumExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-using System.ComponentModel;
+using System.ComponentModel;
 
 namespace NSExt;
 
diff --git a/src/NSExt/EnumerableExtensions.cs b/src/NSExt/EnumerableExtensions.cs
index bbc00a2..7b4fca8 100644
--- a/src/NSExt/EnumerableExtensions.cs
+++ b/src/NSExt/EnumerableExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: EnumerableExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-namespace NSExt;
+namespace NSExt;
 
 public static class EnumerableExtensions
 {
diff --git a/src/NSExt/GenericExtensions.cs b/src/NSExt/GenericExtensions.cs
index 8bda3c7..6a231cd 100644
--- a/src/NSExt/GenericExtensions.cs
+++ b/src/NSExt/GenericExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: GenericExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-namespace NSExt;
+namespace NSExt;
 
 public static class GenericExtensions
 {
diff --git a/src/NSExt/IntExtensions.cs b/src/NSExt/IntExtensions.cs
index 2a4cbc2..669877b 100644
--- a/src/NSExt/IntExtensions.cs
+++ b/src/NSExt/IntExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: IntExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-namespace NSExt;
+namespace NSExt;
 
 public static class IntExtensions
 {
diff --git a/src/NSExt/LoggerExtensions.cs b/src/NSExt/LoggerExtensions.cs
index 1c78f92..3f7a029 100644
--- a/src/NSExt/LoggerExtensions.cs
+++ b/src/NSExt/LoggerExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: LoggerExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-using System.Runtime.CompilerServices;
+using System.Runtime.CompilerServices;
 using Microsoft.Extensions.Logging;
 
 // ReSharper disable TemplateIsNotCompileTimeConstantProblem
diff --git a/src/NSExt/LongExtensions.cs b/src/NSExt/LongExtensions.cs
index 7a6decf..b2e785c 100644
--- a/src/NSExt/LongExtensions.cs
+++ b/src/NSExt/LongExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: LongExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-namespace NSExt;
+namespace NSExt;
 
 public static class LongExtensions
 {
diff --git a/src/NSExt/ObjectExtensions.cs b/src/NSExt/ObjectExtensions.cs
index 5bed4e4..23bf723 100644
--- a/src/NSExt/ObjectExtensions.cs
+++ b/src/NSExt/ObjectExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: ObjectExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 
 namespace NSExt;
 
diff --git a/src/NSExt/StringExtensions.cs b/src/NSExt/StringExtensions.cs
index 2161c39..65f90e0 100644
--- a/src/NSExt/StringExtensions.cs
+++ b/src/NSExt/StringExtensions.cs
@@ -1,17 +1,10 @@
-// @program: NSExt
-// @file: StringExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-using System.Globalization;
+using System.Globalization;
 using System.Security.Cryptography;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Web;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
-using HMACMD5 = System.Security.Cryptography.HMACMD5;
 using MD5 = SshNet.Security.Cryptography.MD5;
 
 // ReSharper disable UnusedMember.Global
@@ -82,6 +75,18 @@ public static class StringExtensions
         return System.DateTime.Parse(me, CultureInfo.CurrentCulture);
     }
 
+    /// <summary>
+    ///     将字符串转换成日期对象
+    /// </summary>
+    /// <param name="me">待转换字符串</param>
+    /// <param name="format">日期格式</param>
+    /// <returns>转换后的日期对象</returns>
+    public static DateTime DateTimeExact(this string me, string format)
+    {
+        return System.DateTime.ParseExact(me, format, CultureInfo.CurrentCulture);
+    }
+
+
     /// <summary>
     ///     将字符串转换成日期对象
     /// </summary>
@@ -93,6 +98,20 @@ public static class StringExtensions
         return !System.DateTime.TryParse(me, out var ret) ? def : ret;
     }
 
+    /// <summary>
+    ///     将字符串转换成日期对象
+    /// </summary>
+    /// <param name="me">待转换字符串</param>
+    /// <param name="format">日期格式</param>
+    /// <param name="def">转换失败时返回的日期对象</param>
+    /// <returns>转换后的日期对象</returns>
+    public static DateTime DateTimeExactTry(this string me, string format, DateTime def)
+    {
+        return !System.DateTime.TryParseExact(me, format, CultureInfo.CurrentCulture, DateTimeStyles.None, out var ret)
+                   ? def
+                   : ret;
+    }
+
     /// <summary>
     ///     string to decimal
     /// </summary>
@@ -123,7 +142,7 @@ public static class StringExtensions
     /// <returns></returns>
     public static T Enum<T>(this string name) where T : Enum
     {
-        return (T)System.Enum.Parse(typeof(T), name);
+        return (T)System.Enum.Parse(typeof(T), name, true);
     }
 
 
@@ -271,7 +290,7 @@ public static class StringExtensions
     }
 
     /// <summary>
-    /// 对一个字符串进行sha1 hash运算
+    ///     对一个字符串进行sha1 hash运算
     /// </summary>
     /// <param name="me">对一个字符串进行sha1 hash运算</param>
     /// <param name="secret">密钥</param>
@@ -301,8 +320,6 @@ public static class StringExtensions
                            .ToLower(CultureInfo.CurrentCulture);
     }
 
- 
-
 
     /// <summary>
     ///     MD5 hmac编码
diff --git a/src/NSExt/UriExtensions.cs b/src/NSExt/UriExtensions.cs
index 611870b..f72bb70 100644
--- a/src/NSExt/UriExtensions.cs
+++ b/src/NSExt/UriExtensions.cs
@@ -1,10 +1,4 @@
-// @program: NSExt
-// @file: UriExtensions.cs
-// @author: tao ke
-// @mailto: taokeu@gmail.com
-// @created: 07/26/2022 21:57
-
-namespace NSExt;
+namespace NSExt;
 
 public static class UriExtensions
 {