使用Linq从数据表中获取不同的行(与多个列不同) [英] get distinct rows from datatable using Linq (distinct with mulitiple columns)

问题描述

我试图区分多个列，并从数据表中获取数据行.但出现错误.

I am trying to distinct on multiple columns and get datarows from datatable. but getting error.

 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()

以下错误:

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中给定列的具有不同行的数据表.

I want another datatable with distinct row based on given columns from SourceTable.

推荐答案

然后尝试这个

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

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