How do I use the GroupBy function in C# LINQ?

How do I use the GroupBy function in C# LINQ?

The GroupBy function in C# LINQ is used to group elements that share a common attribute. Would you like a code example?

Yes, please provide a code example.

Sure! Here's a simple example:

var people = new List<Person>
{
    new Person { Name = "Alice", Age = 30 },
    new Person { Name = "Bob", Age = 30 },
    new Person { Name = "Charlie", Age = 25 }
};

var groupedByAge = people.GroupBy(p => p.Age);

foreach (var group in groupedByAge)
{
    Console.WriteLine($"Age: {group.Key}");
    foreach (var person in group)
    {
        Console.WriteLine($" - {person.Name}");
    }
}

This will group the people by their age.

What if I want to group by multiple properties?

You can use an anonymous type to group by multiple properties. For example:

var grouped = people.GroupBy(p => new { p.Age, p.Name });

This will group by both Age and Name.