controller中异步执行长时间操作

 

controller中异步执行长时间操作：

        [HttpGet]
        [Route("/")]
        public BusinessResult GetxxxxJsonFile() 
        {
            try
            {
                var ret = "";
                //先获取保存在当前Tileset.json文件中的路径
                var file = @"TilesetJsonFilePath.txt";
                if (System.IO.File.Exists(file))
                {
                    using (StreamReader tw = new StreamReader(file))
                    {
                        var line = tw.ReadLine();
                        if (!string.IsNullOrEmpty(line))
                        {
                            ret = line;
                        }
                    }
                }

                //不行再获取默认路径
                if (string.IsNullOrEmpty(ret))
                {
                    var ip = httpContextAccessor.HttpContext.Connection.LocalIpAddress.ToString();
                    ip = (ip == "::1") ? "localhost" : ip;
                    var port = httpContextAccessor.HttpContext.Connection.LocalPort.ToString();
                    ret = $"http://{ip}:{port}/outpath/tileset.json";
                }

                //var addressList = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName()).AddressList;
                //var ips = addressList.Where(address => address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                //        .Select(address => address.ToString()).ToArray();
                //if (ips.Length == 1)
                //{
                //    ip = ips.First();
                //}
                //ip = ips.Where(address => !address.EndsWith(".1")).FirstOrDefault() ?? ips.FirstOrDefault();


                //如果未初始及挂载，这里需要太多时间
                //Quadtree4TilesetCreator creator = GetTilesetCreator();
                //string p = creator.GetTilesetJsonPath();
                //return new BusinessResult
                //{
                //    IsSuccess = true,
                //    CustomerObject = p
                //};
                
                //换这个：
                //异步确认一下挂载情况
                Action excAction = () =>
                {
                    Quadtree4TilesetCreator creator = GetTilesetCreator();
                    string p = creator.GetTilesetJsonPath();
                };
                //excAction.BeginInvoke((a) =>  //System.PlatformNotSupportedException: Operation is not supported on this platform
                //{
                //    // 回调
                //}, "");                
                var workTask = Task.Run(() => excAction.Invoke());

                //最后返回路径
                return new BusinessResult
                {
                    IsSuccess = true,
                    CustomerObject = ret
                };
            }
            catch (Exception ex)
            {
                return new BusinessResult
                {
                    IsSuccess = false,
                    Message = $"获取路径失败错误，{ex.Message}"
                };
            }
        }