[英]C# How to add total row into datatable
I have a table like this 我有这样的桌子
BookingDate Status BookingNumber ---------------------------------- 2016/10/14 1 3 2016/10/14 1 1 2016/10/14 1 5 2016/10/13 1 7 2016/10/13 1 4 2016/10/12 1 8 2016/10/12 1 3 2016/10/12 1 6 2016/10/12 1 2
I want group by BookingDate and count BookingNumber. 我要按BookingDate分组并计数BookingNumber。 Add new row into datatable 将新行添加到数据表
BookingDate Status BookingNumber ---------------------------------------- 2016/10/14 1 3 2016/10/14 1 1 2016/10/14 1 5 2016/10/14 Total 9 2016/10/13 1 7 2016/10/13 1 4 2016/10/14 Total 11 2016/10/12 1 8 2016/10/12 1 3 2016/10/12 1 6 2016/10/12 1 2 2016/10/14 Total 19
Here is my LinqPad example code: 这是我的LinqPad示例代码:
void Main()
{
DataTable workTable = new DataTable("Order");
DataColumn workCol = workTable.Columns.Add("BookingDate", typeof(String));
workTable.Columns.Add("Status", typeof(String));
workTable.Columns.Add("BookingNumber", typeof(int));
workTable.Rows.Add("2016/10/14","1",3);
workTable.Rows.Add("2016/10/14","1",1);
workTable.Rows.Add("2016/10/14","1",5);
workTable.Rows.Add("2016/10/13","1",7);
workTable.Rows.Add("2016/10/13","1",4);
workTable.Rows.Add("2016/10/12","1",8);
workTable.Rows.Add("2016/10/12","1",3);
workTable.Rows.Add("2016/10/12","1",6);
workTable.Rows.Add("2016/10/12","1",2);
workTable.AsEnumerable().GroupBy(x=>x.Field<string>("BookingDate")).Dump();
}
I don't know Linq is able to to this? 我不知道Linq能够做到这一点吗? Or just use for loop to insert new row. 或仅使用for循环插入新行。
Personally, I wouldn't store this in the same table. 就个人而言,我不会将其存储在同一张表中。 Instead, I would have a separate table (maybe called OrderTotals?) that tracked booking totals. 相反,我将有一个单独的表(可能称为OrderTotals?)来跟踪预订总数。 Each order could have a foreign key referencing the primary key of its corresponding totals record. 每个订单可以具有一个外键,该外键引用其相应的总计记录的主键。
But if you really want to store totals in the same table, then I would define an extra, optional column for it. 但是,如果您真的想将总计存储在同一张表中,那么我将为其定义一个额外的可选列。
I finally solve this problem. 我终于解决了这个问题。
void Main()
{
DataTable workTable = new DataTable("Order");
DataColumn workCol = workTable.Columns.Add("BookingDate", typeof(String));
workTable.Columns.Add("Status", typeof(String));
workTable.Columns.Add("BookingNumber", typeof(int));
workTable.Rows.Add("2016/10/14","1",3);
workTable.Rows.Add("2016/10/14","1",1);
workTable.Rows.Add("2016/10/14","1",5);
workTable.Rows.Add("2016/10/13","1",7);
workTable.Rows.Add("2016/10/13","1",4);
workTable.Rows.Add("2016/10/12","1",8);
workTable.Rows.Add("2016/10/12","1",3);
workTable.Rows.Add("2016/10/12","1",6);
workTable.Rows.Add("2016/10/12","1",2);
//========統計人數
var count=workTable.AsEnumerable()
.Select(x=>new { BookingDate= x.Field<string>("BookingDate"),BookingNumber = x.Field<int>("BookingNumber")})
.GroupBy(x=>x.BookingDate)
.Select(x=>new{BookingDate=x.Key,BookingNumber=x.Sum(s=>s.BookingNumber),Index=x.Count()}).OrderByDescending(x=>x.BookingDate).ToList();
count.Dump();
//========插入新的row
int Position=0;
foreach(var obj in count){
DataRow dr = workTable.NewRow();
dr[0] = obj.BookingDate;
dr[1] = "Total";
dr[2] = obj.BookingNumber;
Position +=obj.Index;
workTable.Rows.InsertAt(dr, Position);
Position++;
}
workTable.Dump();
}
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