问题描述
我有 2 个 DataTable，我想创建第三个 DataTable，其中包含 DataTable 1 和 DataTable 2 之间的差异.
I have 2 DataTable and I want to create a third DataTable that contais the difference between DataTable 1 and DataTable 2.
比如DataTable1有原始数据，DataTable 2只是一个副本，就像复制一样.但是当您在 DataTable1 中插入新行时，DataTable2 刚刚插入了同一行.现在我的代码在DataTable1和DataTable2之间做一个比较，如果不相等(插入了1行或更多)，DataTable2再次记录DataTable1中的所有数据.
For example, DataTable1 has the original data, and the DataTable 2 is just a copy, like a replication. But when you insert a new row in DataTable1, the DataTable2 has just insert the same row. Nowaday my code do a compare between DataTable1 and DataTable2, if not equals (1 row or more was inserted), DataTable2 record all data from DataTable1 again.
我怎样才能做一个选择命令，做这个区别并将这些数据记录在第三个 DataTable 中?
How can I do a select command, that do this difference and record those datas in a third DataTable ?
推荐答案
我会考虑有两列来标识表(col1,col2)
I will consider that there are two columns to identify the tables(col1,col2)
var rowsOnlyInDt1 = dt1.AsEnumerable().Where(r => !dt2.AsEnumerable()
.Any(r2 => r["col1"].Trim().ToLower() == r2["col1"].Trim().ToLower() && r["col2"].Trim().ToLower() == r2["col2"].Trim().ToLower()));
DataTable result = rowsOnlyInDt1.CopyToDataTable();//The third table
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