本文整理汇总了VB.NET中System.Data.Objects.ObjectQuery<T>.GroupBy方法的典型用法代码示例。如果您正苦于以下问题：VB.NET ObjectQuery<T>.GroupBy方法的具体用法？VB.NET ObjectQuery<T>.GroupBy怎么用？VB.NET ObjectQuery<T>.GroupBy使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Data.Objects.ObjectQuery<T>的用法示例。
在下文中一共展示了ObjectQuery<T>.GroupBy方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: AdventureWorksEntities
Using context As New AdventureWorksEntities()
Dim queryString As String = "SELECT VALUE product " & vbCr & vbLf & " FROM AdventureWorksEntities.Products AS product"
Dim productQuery As New ObjectQuery(Of Product)(queryString, context, MergeOption.NoTracking)
Dim productQuery2 As ObjectQuery(Of DbDataRecord) = _
productQuery.GroupBy("it.name AS pn", "Sqlserver.COUNT(it.Name) as count, pn")
' Iterate through the collection of Products
' after the GroupBy method was called.
For Each result As DbDataRecord In productQuery2
Console.WriteLine("Name: {0}; Count: {1}", result("pn"), result("count"))
Next
End Using
End Sub示例2: AdventureWorksEntities
Using context As New AdventureWorksEntities()
' Define the query with a GROUP BY clause that returns
' a set of nested LastName records grouped by first letter.
Dim query As ObjectQuery(Of DbDataRecord) = _
context.Contacts.GroupBy("SUBSTRING(it.LastName, 1, 1) AS ln", "ln") _
.Select("it.ln AS ln, (SELECT c1.LastName FROM AdventureWorksEntities.Contacts AS c1 " & _
"WHERE SubString(c1.LastName, 1, 1) = it.ln) AS CONTACT").OrderBy("it.ln")
' Execute the query and walk through the nested records.
For Each rec As DbDataRecord In query.Execute(MergeOption.AppendOnly)
Console.WriteLine("Last names that start with the letter '{0}':", rec(0))
Dim list As List(Of DbDataRecord) = TryCast(rec(1), List(Of DbDataRecord))
For Each r As DbDataRecord In list
For i As Integer = 0 To r.FieldCount - 1
Console.WriteLine(" {0} ", r(i))
Next
Next
Next
End Using