diff --git a/Jx.Toolbox.HtmlTools/Jx.Toolbox.HtmlTools.csproj b/Jx.Toolbox.HtmlTools/Jx.Toolbox.HtmlTools.csproj
index b4bea4b..8eb7111 100644
--- a/Jx.Toolbox.HtmlTools/Jx.Toolbox.HtmlTools.csproj
+++ b/Jx.Toolbox.HtmlTools/Jx.Toolbox.HtmlTools.csproj
@@ -15,7 +15,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="AngleSharp" Version="0.17.1" />
+      <PackageReference Include="AngleSharp" Version="1.0.1" />
     </ItemGroup>
 
 </Project>
diff --git a/Jx.Toolbox/Extensions/StringExtension.cs b/Jx.Toolbox/Extensions/StringExtension.cs
index e2398ca..500ae5d 100644
--- a/Jx.Toolbox/Extensions/StringExtension.cs
+++ b/Jx.Toolbox/Extensions/StringExtension.cs
@@ -90,5 +90,15 @@ public static string FirstLetterToLower(this string str)
         {
             return str.Remove(1).ToLower() + str.Substring(1);
         }
+
+        /// <summary>
+        /// 扩展Trim方法，避免null报错
+        /// </summary>
+        /// <param name="str"></param>
+        /// <returns></returns>
+        public static string TrimEx(this string str)
+        {
+            return str == null ? string.Empty : str.Trim();
+        }
     }
 }
\ No newline at end of file
diff --git a/Jx.Toolbox/Jx.Toolbox.csproj b/Jx.Toolbox/Jx.Toolbox.csproj
index 7caf437..611d249 100644
--- a/Jx.Toolbox/Jx.Toolbox.csproj
+++ b/Jx.Toolbox/Jx.Toolbox.csproj
@@ -9,7 +9,7 @@
         <PackageProjectUrl>https://github.com/j4587698/Jx.Toolbox</PackageProjectUrl>
         <PackageLicenseExpression>MIT</PackageLicenseExpression>
         <PackageTags>tool</PackageTags>
-        <PackageVersion>0.3.2</PackageVersion>
+        <PackageVersion>0.3.3</PackageVersion>
     </PropertyGroup>
 
 </Project>
diff --git a/Jx.Toolbox/Utils/Os.cs b/Jx.Toolbox/Utils/Os.cs
new file mode 100644
index 0000000..95ce915
--- /dev/null
+++ b/Jx.Toolbox/Utils/Os.cs
@@ -0,0 +1,38 @@
+using System.Runtime.InteropServices;
+
+namespace Jx.Toolbox.Utils
+{
+    /// <summary>
+    /// 系统类型
+    /// </summary>
+    public static class Os
+    {
+        /// <summary>
+        /// 是否是Windows系统
+        /// </summary>
+        /// <returns></returns>
+        public static bool IsWindows()
+        {
+            return RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
+        }
+        
+        /// <summary>
+        /// 是否是Linux系统
+        /// </summary>
+        /// <returns></returns>
+        public static bool IsLinux()
+        {
+            return RuntimeInformation.IsOSPlatform(OSPlatform.Linux);
+        }
+        
+        /// <summary>
+        /// 是否是MaxOs系统
+        /// </summary>
+        /// <returns></returns>
+        public static bool IsMacOs()
+        {
+            return RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
+        }
+        
+    }
+}
\ No newline at end of file
diff --git a/Jx.Toolbox/Utils/ProcessUtil.cs b/Jx.Toolbox/Utils/ProcessUtil.cs
new file mode 100644
index 0000000..b754e55
--- /dev/null
+++ b/Jx.Toolbox/Utils/ProcessUtil.cs
@@ -0,0 +1,25 @@
+using System.Diagnostics;
+
+namespace Jx.Toolbox.Utils
+{
+    public class ProcessUtil
+    {
+        public static void KillProcess(string processName)
+        {
+            foreach (var process in Process.GetProcessesByName(processName))
+            {
+                process.Kill();
+            }
+        }
+        
+        public static void KillProcess(int processId)
+        {
+            Process.GetProcessById(processId).Kill();
+        }
+        
+        public static void StartProcess(string fileName, string arguments)
+        {
+            Process.Start(fileName, arguments);
+        }
+    }
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index 8a69832..9d9a842 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,14 @@ Properties扩展类，用于简单的Properties文件独写，可以快速将类
 Properties.Serialize(要序列化的类); // 将类序列化为Properties字符串
 ```
 
+Os
+操作系统类型，用于判断当前操作系统类型
+```
+Os.IsWindows(); // 是否为Windows
+Os.IsLinux(); // 是否为Linux
+Os.IsMacOs(); // 是否为MacOS
+```
+
 ## 扩展库
 
 StringExtension
@@ -65,6 +73,7 @@ StringExtension
 "字符串".ToUnderLine(); // 驼峰转下划线
 "字符串".FirstLetterToLower(); // 字符串首字母小写
 "字符串".FirstLetterToUpper(); // 字符串首字母大写
+"字符串".TrimEx(); // 安全的Trim，如果字符串为null，则返回string.Empty
 ```
 
 ObjectExtension