[英]i have to compare two datatables c# asp.net, compare its two columns and add that resultant column in the new datatable
I have tried this , but i don't know how to manipulate LINQ query to find difference between two columns from the data table. 我已经尝试过了,但是我不知道如何操纵LINQ查询来查找数据表中两列之间的差异。
I have two datatables dtStockTransactionData
and dtStocksData
. 我有两个数据表
dtStockTransactionData
和dtStocksData
。 Below code explains how I have manupulated the result 下面的代码说明了我如何处理结果
DataTable dtMerged = (from a in dtStockTransactionData.AsEnumerable()
join b in dtStocksData.AsEnumerable()
on a["exchangesymbol"].ToString() equals b["exchange_symbol"].ToString()
into g
where g.Count() > 0
select a).CopyToDataTable();
grdErrSTSData.DataSource = dtMerged;
grdErrSTSData.DataBind();
return dtMerged;
If I understood your question you can do this using link query with select new
keyword.This is a example for Link with join - 如果我理解了您的问题,则可以使用带有
select new
关键字的链接查询来完成此操作。这是带有连接的链接的示例-
from a in db.table1
join b in db.table2 on a.valueA equals b.valueB
select new { A = a.valueA, B = valueB};
As your code: 作为您的代码:
var selected = from a in dtStockTransactionData.AsEnumerable()
join b in dtStocksData.AsEnumerable()
on a["exchangesymbol"].ToString() equals b["exchange_symbol"].ToString()
into g
where g.Count() > 0
select new{
value1 = a.wantedValue,
value2 = b.wantedValue
}
Then you can get result using selected
然后您可以使用
selected
结果
After that you can compare data in own way. 之后,您可以按照自己的方式比较数据。
Refer this Return list using select new in LINQ 使用LINQ中的select new引用此返回列表
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