在VB.net和C#中，可以使用匿名类型来对数据进行分组。下面是使用VB.net和C#分别实现按匿名类型分组的示例代码：

VB.net示例代码：

' 定义一个匿名类型
Dim anonymousType = New With {Key .Name = "", Key .Age = 0}

' 创建一个包含数据的列表
Dim data As New List(Of Object) From {
    New With {.Name = "John", .Age = 25},
    New With {.Name = "Jane", .Age = 30},
    New With {.Name = "Bob", .Age = 25},
    New With {.Name = "Alice", .Age = 30}
}

' 使用LINQ查询语法按匿名类型分组
Dim groupedData = From d In data
                  Group d By d.Name, d.Age Into Group
                  Select New With {.Name = Name, .Age = Age, .Count = Group.Count()}

' 遍历分组结果并输出
For Each group In groupedData
    Console.WriteLine("Group: Name={0}, Age={1}, Count={2}", group.Name, group.Age, group.Count)
Next

C#示例代码：

// 定义一个匿名类型
var anonymousType = new { Name = "", Age = 0 };

// 创建一个包含数据的列表
var data = new List