Last Updated: December 26, 2018

Use GroupBy method to group objects based on more than one property/field value

It is very common to use the GroupBy method to group objects based on the value of field, property or method returned value.
var groupedByAge = people.GroupBy(p => p.Age);

But you can also group objects based on the value of not just one field but more.
Example:

var people = new[]
{
 new Person
 {
 Name = "Marwan",
 Age = 25,
 JobTitle ="Developer"
 },
 new Person
 {
 Name = "Hamed",
 Age = 24,
 JobTitle ="Designer"
 },
 new Person
 {
 Name = "Atef",
 Age = 24,
 JobTitle ="Designer"
 },
 new Person
 {
 Name = "Khaled",
 Age = 24,
 JobTitle ="DB Admin"
 }
};

var byAge = people.GroupBy(p => p.Age);
foreach (var group in byAge)
{
 Console.WriteLine("Age {0}", group.Key);
 foreach (var person in group)
 {
 Console.WriteLine("\t{0}", person.Name);
 }
}

var byAgeAndJobTitle = people
 .GroupBy(p => new {
 p.Age,
 p.JobTitle
 });
foreach (var group in byAgeAndJobTitle)
{
 Console.WriteLine("Age {0} and Job Title {1}",
 group.Key.Age, group.Key.JobTitle);
 foreach (var person in group)
 {
 Console.WriteLine("\t{0}", person.Name);
 }
}

Console.Read();

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