使用Linq从数据表中获取不同的行(与mulitiple列不同)

Question

我试图区分多个列并从datatable获取数据行.但得到错误.

 Dim query As IEnumerable(Of DataRow) = 
            (From row As DataRow In SourceTable.AsEnumerable() _
             Select row.Field(Of String)("ColumnName1"),
                    row.Field(Of String)("ColumnName2") ).Distinct()

低于错误:

Unable to cast object of type '<DistinctIterator>d__7a`1[System.String]' 
to type 'System.Collections.Generic.IEnumerable`1[System.Data.DataRow]'.

我想要另一个基于SourceTable给定列的不同行的数据表.

Answer 1

那就试试这个吧

Dim query = From q In (From p In dt.AsEnumerable() Select New With {.col1= p("ColumnName1"), .col2 = p("ColumnName2")}) Select q.col1, q.col2 Distinct