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GroupBy Multiple Values in LINQ

, 3 Jun 2009
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Here's a simple example to show you how to GroupBy Multiple Valuesusing LINQ. In this example, I am grouping by Age and Sex to find thecount of people who have the same age and sex.C#public partial class LINQ : System.Web.UI.Page{    protected void Page_Load(object sender, EventAr

Here's a simple example to show you how to GroupBy Multiple Values using LINQ. In this example, I am grouping by Age and Sex to find the count of people who have the same age and sex.

C#


public partial class LINQ : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

      List<Employee> empList = new List<Employee>();

      empList.Add(new Employee() { ID = 1, FName = "John", Age=23, Sex='M'  });

      empList.Add(new Employee() { ID = 2, FName = "Mary", Age = 25, Sex = 'F' });


      empList.Add(new Employee() { ID = 3, FName = "Amber", Age = 23, Sex = 'M' });

      empList.Add(new Employee() { ID = 4, FName = "Kathy", Age=25, Sex='M'});

      empList.Add(new Employee() { ID = 5, FName = "Lena", Age=27, Sex='F'});


      empList.Add(new Employee() { ID = 6, FName = "Bill", Age = 28, Sex = 'M' });

      empList.Add(new Employee() { ID = 7, FName = "Celina", Age = 27, Sex = 'F' });

      empList.Add(new Employee() { ID = 8, FName = "John", Age = 28, Sex = 'M' });

 

      var sums = empList

               .GroupBy(x => new { x.Age, x.Sex })

               .Select(group => new { Peo = group.Key, Count = group.Count() });

 

      foreach (var employee in sums)
          Response.Write(employee.Count + ": " + employee.Peo);

    }


    class Employee

    {

        public int ID { get; set; }

        public string FName { get; set; }

        public int Age { get; set; }

        public char Sex { get; set; }

    }




VB.NET


Partial Public Class LINQ

    Inherits System.Web.UI.Page

 

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

        Dim empList As New List(Of Employee)()

        empList.Add(New Employee() With {.ID = 1, .FName = "John", .Age = 23, .Sex = "M"c})

        empList.Add(New Employee() With {.ID = 2, .FName = "Mary", .Age = 25, .Sex = "F"c})

        empList.Add(New Employee() With {.ID = 3, .FName = "Amber", .Age = 23, .Sex = "M"c})

        empList.Add(New Employee() With {.ID = 4, .FName = "Kathy", .Age = 25, .Sex = "M"c})

        empList.Add(New Employee() With {.ID = 5, .FName = "Lena", .Age = 27, .Sex = "F"c})

        empList.Add(New Employee() With {.ID = 6, .FName = "Bill", .Age = 28, .Sex = "M"c})

        empList.Add(New Employee() With {.ID = 7, .FName = "Celina", .Age = 27, .Sex = "F"c})

        empList.Add(New Employee() With {.ID = 8, .FName = "John", .Age = 28, .Sex = "M"c})

        Dim sums = empList.GroupBy(Function(x) New With {Key x.Age, Key x.Sex}).Select(Function(group) New With {Key .Peo = group.Key, Key .Count = group.Count()})


        For Each employee In sums

            ' use employee.Count and employee.Key

        Next employee


    End Sub

 

    Public Class Employee

        Private privateID As Integer

        Public Property ID() As Integer


            Get

                Return privateID

            End Get


            Set(ByVal value As Integer)

                privateID = value

            End Set


        End Property


        Private privateFName As String

        Public Property FName() As String

            Get

                Return privateFName

            End Get


            Set(ByVal value As String)

                privateFName = value

            End Set

        End Property

 

        Private privateAge As Integer

        Public Property Age() As Integer

            Get

                Return privateAge

            End Get


            Set(ByVal value As Integer)

                privateAge = value

            End Set

        End Property

 

        Private privateSex As Char

        Public Property Sex() As Char

            Get

                Return privateSex

            End Get


            Set(ByVal value As Char)

                privateSex = value

            End Set

        End Property

    End Class

End Class

 


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About the Author

merlin981
Software Developer (Senior)
United States United States
Winner - Best Mobile App - AT&T Developer Summit, Las Vegas, 2013
 
My personal resume can be found at: http://www.philippiercedeveloper.com
 
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About Philip Pierce:
 
I am a software developer with twenty years experience in game development, mobile, web, desktop, server, and database. My extensive background highlights an expertise in rapid application development using the latest Microsoft, Mobile, and Game Development technologies, along with the ability to create AI for games and business software, redesign existing software, develop multi-threaded software, and create client/server applications.

Comments and Discussions

 
GeneralMy vote of 1 PinmemberMichael Bertelsen8-Jun-09 12:26 
GeneralMy vote of 1 PinmemberJon Artus3-Jun-09 3:47 
GeneralMy vote of 1 PinmemberJosh Fischer3-Jun-09 3:26 

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