以下将给你一个新的表,其中包含RelatedTo和RulesID的唯一组合。从那里你可以使用For...Next
循环来计算行数。
Dim matches As New DataTable("matches")
matches.Columns.Add("ID")
matches.Columns.Add("RelatesTo")
matches.Columns.Add("RulesID")
matches.Rows.Add("ID10", "ID1", "Rule1")
matches.Rows.Add("ID11", "ID1", "Rule1")
matches.Rows.Add("ID12", "ID1", "Rule2")
matches.Rows.Add("ID13", "ID1", "Rule3")
matches.Rows.Add("ID14", "ID2", "Rule1")
matches.Rows.Add("ID15", "ID2", "Rule3")
matches.Rows.Add("ID16", "ID3", "Rule2")
matches.Rows.Add("ID17", "ID3", "Rule3")
matches.Rows.Add("ID18", "ID4", "Rule3")
Dim unique As DataTable = matches.DefaultView.ToTable("unique", True, New String() {"RelatesTo", "RulesID"})
来源
2017-08-31 08:21:12
SSS
请编辑您的问题并添加[最小,完整和可验证示例](https://stackoverflow.com/help/mcve) –