Vb.net LINQ语法使用方法语法按多列分组

Dim data = New List(Of Person)() From {
    New Person With {.Name = "John", .Age = 25, .City = "New York"},
    New Person With {.Name = "Jane", .Age = 30, .City = "London"},
    New Person With {.Name = "Tom", .Age = 25, .City = "New York"},
    New Person With {.Name = "Alice", .Age = 30, .City = "London"}
}

Dim groupedData = From p In data
                  Group By p.Age, p.City Into Group
                  Select Age, City, Count = Group.Count()

For Each item In groupedData
    Console.WriteLine($"Age: {item.Age}, City: {item.City}, Count: {item.Count}")
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