Search in Generic List<T> in C#

Sometimes, we will have requirements to search for an object in a Generic List<T>.

For example, List<Customer> collection will have a collection of Customer objects. To a search a Customer object from collection we can use the new feature called Predicate delegate.

The below code snippet will search the customer based on a ID and returns that Customer object from the Collection.

List<Customer> cuslist1 = new List<Customer>();

        Customer cus1 = new Customer();

        cus1.ID = 1;

        cus1.Name = "Fatima";

        cus1.Age = 23;

        cuslist1.Add(cus1);

        Customer cus2 = new Customer();

        cus2.ID = 2;

        cus2.Name = "Evangeline";

        cus2.Age = 24;

        cuslist1.Add(cus2);

        Customer cus3 = new Customer();

        cus3.ID = 3;

        cus3.Name = "Damien";

        cus3.Age = 27;

        cuslist1.Add(cus3);

        Customer cus4 = new Customer();

        cus4.ID = 4;

        cus4.Name = "Cameroon";

        cus4.Age = 21;

        cuslist1.Add(cus4);

        Customer cus5 = new Customer();

        cus5.ID = 5;

        cus5.Name = "Babu";

        cus5.Age = 20;

        cuslist1.Add(cus5);

        Customer cusTemp = cuslist1.Find(delegate(Customer _cus)

            {

                if (_cus.ID == 4)

                {

                    return true;

                }

                return false;

            });

        Response.Write(cusTemp.Name+"<br>"+cusTemp.Age);

In the above code, i have searched the customer with ID as 4. You can add your own filteration or criteria in the Find() method to find a object in generic list.

The above code uses Anonymous delegate. Follow the link to read more about  Delegates and Anonymous methods in C#