我们可以用Environment.OSVersion来判断当前操作系统

public static bool IsWin7 => Environment.OSVersion.Version.Major == 6
                       && Environment.OSVersion.Version.Minor == 1;
public static bool IsWin10 => Environment.OSVersion.Version.Major == 10;

For applications that have been manifested for Windows 8.1 or Windows 10. Applications not manifested for Windows 8.1 or Windows 10 will return the Windows 8 OS version value (6.2). To manifest your applications for Windows 8.1 or Windows 10, refer to Targeting your application for Windows.

现在需要一个程序清单文件

然后把下面的注释去掉，就可以返回10.0.***了

还有另外一种方法如下。

利用C#判断当前操作系统是否为Win8系统(此方法不需要添加程序清单文件)

代码：

using System;
  
namespace GetOSVersionExp
{
  class Program
  {
    static void Main(string[] args)
    {
      Version currentVersion = Environment.OSVersion.Version;
      Version compareToVersion = new Version("6.2");
      if (currentVersion.CompareTo(compareToVersion) >= 0)
      {//win8及其以上版本的系统
        Console.WriteLine("当前系统是WIN8及以上版本系统。");
      }
      else
      {
        Console.WriteLine("当前系统不是WIN8及以上版本系统。");
      }
    }
  }
}