Question

我正在尝试将以下内容转换为vb.net。提前致谢

   Categories.DataSource = objDT.Rows.Cast<DataRow>()
        .Select(r => new { Attendee = r.Field<string>("Attendee"), Item = r.Field<string>("Item") })
        .GroupBy(v => v.Attendee)
        .Select(g => new { Attendee = g.Key, Item = g.ToList() });

这是我陷入困境的地方，我尝试了两种不同的方法，但仍然无效：

Categories.DataSource = objDT.AsEnumerable() _
    .Select(Function(r) New With {.Attendee = r.Field(Of String)("Attendee"), .Item = r.Field(Of String)("Item")}) _
    .GroupBy(Function(v) v.Field(Of String)("Attendee")) _
    .Select(Function(g) Attendee = g.Key)

或

Categories.DataSource = objDT.Rows.Cast(Of DataRow)().AsEnumerable _
    .Select New Object(){ Function(r As DataRow) Attendee = r.Field(Of String)("Attendee"), Item = r.Field(Of String)("Item")} _
.GroupBy( Function(v) v.Category) _
.Select( Function(g) new { Category = g.Key, Numbers = g.ToList() }

Answer 1

试试这个：

  Categories.DataSource = objDT.Rows.Cast(Of DataRow)().Select(Function(r) New With { _
 .Attendee = r.Field(Of String)("Attendee"), _
 .Item = r.Field(Of String)("Item") _
}).GroupBy(Function(v) v.Attendee).Select(Function(g) New With { _
 .Attendee = g.Key, _
 .Item = g.ToList() _
})

对象类（New Object（）与{}）不同于匿名类型（New With {}）。

您以后可以使用此网站：http://www.developerfusion.com/tools/convert/csharp-to-vb/。它适用于大多数转换。

Answer 2

尝试以下

Categories.DataSource = objDT.Rows.Cast(Of DataRow)() _
    .Select(Function(r) New With {.Attendee = r.Field(Of String)("Attendee"), .Item = r.Field(Of String)("Item")}) _
    .GroupBy(Function(v) v.Attendee) _
    .Select(Function(g) New With { .Attendee = g.Key, .Item = g.ToList()})

无法将其转换为VB.net

2 个答案: