代码修改后的版本，全部提交

COSXML/Common/CosVersion.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Diagnostics;
+
+using System.Text;
+/**
+* Copyright (c) 2018 Tencent Cloud. All rights reserved.
+* 11/2/2018 2:34:04 PM
+* bradyxiao
+*/
+namespace COSXML.Common
+{
+    public sealed class CosVersion
+    {
+        private static string SDKVersion = "5.4.11.0";
+
+        public static string GetUserAgent()
+        {
+            StringBuilder userAgent = new StringBuilder();
+            userAgent.Append("cos-net-sdk").Append('.')
+                .Append(SDKVersion);
+            return userAgent.ToString();
+        }
+
+        //public static string GetOsVersion()
+        //{
+        //    try
+        //    {
+        //        var os = Environment.OSVersion;
+        //        return "windows " + os.Version.Major + "." + os.Version.Minor;
+        //    }
+        //    catch (InvalidOperationException)
+        //    {
+        //        return "Unknown OSVersion";
+        //    }
+        //}
+
+        //public static string GetOsArchitecture()
+        //{
+        //    return (IntPtr.Size == 8) ? "x86_64" : "x86";
+        //}
+    }
+}