With C# 3.0, Collection Initializer is the combination of Collection Classes and Object Initializers. This feature is available for all the objects which are enumerable (i.e. they implement IEnumerable<T>) and have a public ‘Add’ Method to add the value.
class CEmployee
{
private int EmpID;
public int EID
{
get { return EmpID; }
set { EmpID = value; }
}
private string EmpName;
public string ENAME
{
get { return EmpName; }
set { EmpName = value; }
}
}
Using the above given class, if you want to create a List of Employees, then in C# 2.0 the code will be:
List<CEmployee> Employees = new List<CEmployee>();
CEmployee e1 = new CEmployee(101, "Rohit Sharma");
// If you have implemented Constructor
Employees.Add(e1);
And, if there is no Constructor, then:
List<CEmployee> Employees = new List<CEmployee>();
CEmployee e1 = new CEmployee();
e1.EID = 1;
e1.ENAME = "Ramesh Sachin";
Employees.Add(e1);
This is for 1 Employee, now if you want to add 5 Employees, then you have to create them separately and add them in the list one by one.
But in C# 3.0, it is made easier, like below:
List<CEmployee> Employees = new List<CEmployee>()
{
new CEmployee() { EID = 101, ENAME = "Goutham" },
new CEmployee() { EID = 102, ENAME = "Virat" },
new CEmployee() { EID = 103, ENAME = "Raina" },
new CEmployee() { EID = 104, ENAME = "Isanth" },
new CEmployee() { EID = 105, ENAME = "Mahendar" }
};
