在NET+EF+MVC开发接口时，有些任务需要异步执行，下面笔者介绍一下异步调用的方法，以供参考：

#region 记录机器人心跳

[HttpPost]

public async Task AddHeartBeat(decimal KindergartenID, decimal host_id, string longitude_latitude, string map_location, short run_state, string device_name, string equipment_number, string serverurl,string createtime=null)

{

var task = Task.Run(() =>

{

if (KindergartenID > 0 && host_id > 0)

{

string ip = "";

try

{

if(string.IsNullOrEmpty(createtime))

{

createtime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");

}

#region 提交到api服务器

var postUrl = serverurl + "/api/HXBY_bbwhost/Addnetmonitor";

WebRequest request7 = WebRequest.Create(postUrl);

request7.Method = "POST";

//post传参数

string postdata = "longitude_latitude=" + longitude_latitude + "&host_id=" + host_id + "&KindergartenID=" + KindergartenID + "&map_location=" + Server.UrlEncode(map_location) + "&run_state=" + run_state + "&device_name=" + Server.UrlEncode(device_name) + "&equipment_number=" + equipment_number + "&ip=" + ip;

byte[] bytes = Encoding.ASCII.GetBytes(postdata);

request7.Timeout = 5000;

request7.ContentType = "application/x-www-form-urlencoded";

request7.ContentLength = postdata.Length;

Stream sendStream = request7.GetRequestStream();

sendStream.Write(bytes, 0, bytes.Length);

sendStream.Close();

#endregion

#region 主机心跳

//0：根据经纬度记录 1：根据IP记录

int type = 0;

string longitude = null;

string latitude = null;

if (!string.IsNullOrEmpty(longitude_latitude))

{

string[] array = longitude_latitude.Split('|');

if (array.Length == 2)

{

type = 0;

longitude = array[0];

latitude = array[1];

}

}

else

{

type = 1;

longitude = "";

latitude = "";

map_location = WisdomStarts.Common.Utils.GetIPArea(ip);

}

DBHelper dd = new DBHelper();

int rows = dd.Set("insert into hx_hw_netmonitor( KindergartenID,host_id,longitude,latitude,map_location,run_state,device_name,equipment_number,ip,type,iswarning,createtime,serverurl ) values('" + KindergartenID + "', '" + host_id + "','" + longitude + "' ,'" + latitude + "' ,'" + map_location + "'," + run_state + ",'" + device_name + "','" + equipment_number + "','" + ip + "' ," + type + ",0,'" + createtime + "','" + serverurl + "' ) ");

#endregion 机器人心跳

}

catch (Exception ee)

{

WisdomStarts.Common.Log.NetLog.WriteTextLog("记录晨检机接送机心跳", ee.ToString());

}

}

});

await task;

}

#endregion