c#获取已安装的所有NET版本

  /// <summary>

        /// 获取已安装的所有NET版本

        /// </summary>

        /// <returns></returns>

        public static List<string> GetDotNetVersions()

        {

            var filepath =Environment.SystemDirectory + @"\..\Microsoft.NET\Framework";

            DirectoryInfo[] directories = new DirectoryInfo(filepath).GetDirectories("v?.?.*");

            List<string> list = new List<string>();

            foreach (DirectoryInfo info in directories)

            {

                list.Add(info.Name.Substring());

            }

            return list;

        }