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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