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[英]To convert IEnumerable<dynamic> to IEnumerable<DataRow>
[英]Convert IEnumerable<DataRow> to EnumerableRowCollection<DataRow> or DataView
我怎么能result
以EnumerableRowCollection<DataRow>
或DataView
?
DataTable table1 = /*something*/ ;
DataTable table2 = /*something*/ ;
DataTable table3 = /*something*/ ;
IEnumerable<DataRow> result = (from t1 in table1.AsEnumerable() join
t2 in table2.AsEnumerable() on t1.Field<int>("id") equals t2.Field<int>("t1id") join
t3 in table3.AsEnumerable() on t2.Field<int>("t3id") equals t3.Field<int>("id")
where 666.Equals(t3.Field<int>("id"))
select t1);
謝謝
正如喬恩·斯基特所說:
DataTable table1 = /*something*/ ;
DataTable table2 = /*something*/ ;
DataTable table3 = /*something*/ ;
DataTable result = (from t1 in table1.AsEnumerable() join
t2 in table2.AsEnumerable() on t1.Field<int>("id") equals t2.Field<int>("t1id") join
t3 in table3.AsEnumerable() on t2.Field<int>("t3id") equals t3.Field<int>("id")
where 666.Equals(t3.Field<int>("id"))
select t1).CopyToDataTable<DataRow>();
如果你想要一個數據視圖:
DataTable table1 = /*something*/ ;
DataTable table2 = /*something*/ ;
DataTable table3 = /*something*/ ;
DataView result = (from t1 in table1.AsEnumerable() join
t2 in table2.AsEnumerable() on t1.Field<int>("id") equals t2.Field<int>("t1id") join
t3 in table3.AsEnumerable() on t2.Field<int>("t3id") equals t3.Field<int>("id")
where 666.Equals(t3.Field<int>("id"))
select t1).CopyToDataTable<DataRow>().AsDataView();
從 .NET 文檔這里
DataTable orders = dataSet.Tables["SalesOrderHeader"];
EnumerableRowCollection<DataRow> query =
from order in orders.AsEnumerable()
where order.Field<bool>("OnlineOrderFlag") == true
orderby order.Field<decimal>("TotalDue")
select order;
DataView view = query.AsDataView();
bindingSource1.DataSource = view;
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