diff --git a/Samples/Zero.HttpServer/Program.cs b/Samples/Zero.HttpServer/Program.cs
index c9f6e0348..56c55c7c2 100644
--- a/Samples/Zero.HttpServer/Program.cs
+++ b/Samples/Zero.HttpServer/Program.cs
@@ -1,4 +1,5 @@
-using NewLife.Caching;
+using NewLife;
+using NewLife.Caching;
 using NewLife.Caching.Services;
 using NewLife.Http;
 using NewLife.Log;
diff --git a/XUnitTest.Core/Common/UtilityTests.cs b/XUnitTest.Core/Common/UtilityTests.cs
index 916ac45d0..fa044b211 100644
--- a/XUnitTest.Core/Common/UtilityTests.cs
+++ b/XUnitTest.Core/Common/UtilityTests.cs
@@ -1,4 +1,5 @@
 using Microsoft.Extensions.Primitives;
+using NewLife;
 using NewLife.Log;
 using Xunit;
 
diff --git a/XUnitTest.Core/Http/WebSocketMessageTests.cs b/XUnitTest.Core/Http/WebSocketMessageTests.cs
index 5edca6fec..5b3ab3398 100644
--- a/XUnitTest.Core/Http/WebSocketMessageTests.cs
+++ b/XUnitTest.Core/Http/WebSocketMessageTests.cs
@@ -1,4 +1,4 @@
-using System;
+using NewLife;
 using NewLife.Buffers;
 using NewLife.Data;
 using NewLife.Http;
diff --git a/XUnitTest.Core/Reflection/AssemblyXTests.cs b/XUnitTest.Core/Reflection/AssemblyXTests.cs
index 5dd5cffd6..191287633 100644
--- a/XUnitTest.Core/Reflection/AssemblyXTests.cs
+++ b/XUnitTest.Core/Reflection/AssemblyXTests.cs
@@ -1,29 +1,28 @@
-using System;
+using NewLife;
 using NewLife.Reflection;
 using Xunit;
 
-namespace XUnitTest.Reflection
+namespace XUnitTest.Reflection;
+
+public class AssemblyXTests
 {
-    public class AssemblyXTests
+    [Fact]
+    public void GetCompileTime()
     {
-        [Fact]
-        public void GetCompileTime()
         {
-            {
-                var ver = "2.0.8153.37437";
-                var time = AssemblyX.GetCompileTime(ver);
-                Assert.Equal("2022-04-28 20:47:54".ToDateTime(), time);
-            }
-            {
-                var ver = "9.0.2022.427";
-                var time = AssemblyX.GetCompileTime(ver);
-                Assert.Equal("2022-04-27 00:00:00".ToDateTime(), time);
-            }
-            {
-                var ver = "9.0.2022.0427-beta0344";
-                var time = AssemblyX.GetCompileTime(ver);
-                Assert.Equal("2022-04-27 03:44:00".ToDateTime(), time.ToUniversalTime());
-            }
+            var ver = "2.0.8153.37437";
+            var time = AssemblyX.GetCompileTime(ver);
+            Assert.Equal("2022-04-28 20:47:54".ToDateTime(), time);
+        }
+        {
+            var ver = "9.0.2022.427";
+            var time = AssemblyX.GetCompileTime(ver);
+            Assert.Equal("2022-04-27 00:00:00".ToDateTime(), time);
+        }
+        {
+            var ver = "9.0.2022.0427-beta0344";
+            var time = AssemblyX.GetCompileTime(ver);
+            Assert.Equal("2022-04-27 03:44:00".ToDateTime(), time.ToUniversalTime());
         }
     }
 }
diff --git a/XUnitTest.Core/Serialization/JsonWriterTests.cs b/XUnitTest.Core/Serialization/JsonWriterTests.cs
index 718d2bfa0..3b80f4cea 100644
--- a/XUnitTest.Core/Serialization/JsonWriterTests.cs
+++ b/XUnitTest.Core/Serialization/JsonWriterTests.cs
@@ -1,6 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
+using NewLife;
 using NewLife.Data;
 using NewLife.Log;
 using NewLife.Serialization;
diff --git a/XUnitTest.Core/Web/JwtBuilderTests.cs b/XUnitTest.Core/Web/JwtBuilderTests.cs
index 4b57e13c9..d62d8c82e 100644
--- a/XUnitTest.Core/Web/JwtBuilderTests.cs
+++ b/XUnitTest.Core/Web/JwtBuilderTests.cs
@@ -1,4 +1,4 @@
-using System;
+using NewLife;
 using NewLife.Security;
 using NewLife.Web;
 using Xunit;