gridview 绑定多个格式相同的数据源（数据查询合并）

在做项目时，要求在同一个GridView中同时显示不同分组中的前若干条数据

几个技术要点：

1、数据分组，本方法中未用group by

2、几个结果格式相同的查询合并绑定

3、取查询结果的前或后若干条数据

public int BindLiftData()

{

int count = 0;

using (MySqlConnection conn = new MySqlConnection(dbServer))

{

FrDData db = new FrDData(conn);

List<int> ids = new List<int>();

var item =  from i in db.Items

join p in db.ProgS on i.ProgID equals p.ID

where p.State == 1 && i.Type == "升程"

select new {i.ID};

bool isFirst = true;

int firstID =0;

foreach (var i in item)

{

if (isFirst)

{

firstID = i.ID;

isFirst = false;

}

else

ids.Add(i.ID);

}

var q = (from i in db.Items

join l in db.Lifts on i.ID equals l.ItemID

where i.ID == firstID

orderby l.ID descending

select new { i.ID, i.Name, l.Angle, i.Stole, l.Lift }).Take(3).ToList();

foreach(var x in ids)

{

var r = (from i in db.Items

join l in db.Lifts on i.ID equals l.ItemID

where i.ID == x

orderby l.ID descending

select new { i.ID, i.Name, l.Angle, i.Stole, l.Lift }).Take(3).ToList();

q.AddRange(r);

}

gvLift.DataSource = q;

count = q.Count;

}

return count;

}