Declare method using T and where [Answered]

This is some code from a reddit post i saw and there are some thing i dont understand.

This is the method:

public static T CreateStudentFromEntity<T>(Student entity) where T : IStudent
        {
            var student = Activator.CreateInstance<T>();

            student.Id = entity.Id;
            student.FirstName = entity.Name;
            student.Surname = entity.Surname;
            student.DateOfBirth = DateTime.Parse(entity.DateOfBirth);
            student.Sex = (Sex)entity.Sex;
            student.Address = CreateAddressFromEntity(entity.Address);

            return student;
        }

public static T CreateStudentFromEntity<T>(Student entity) where T : IStudent
        {
            var student = Activator.CreateInstance<T>();

            student.Id = entity.Id;
            student.FirstName = entity.Name;
            student.Surname = entity.Surname;
            student.DateOfBirth = DateTime.Parse(entity.DateOfBirth);
            student.Sex = (Sex)entity.Sex;
            student.Address = CreateAddressFromEntity(entity.Address);

            return student;
        }

This is the interface that the method uses:

public interface IStudent
{
    long Id { get; set; }
    string? FirstName { get; set; }
    string? Surname { get; set; }
    DateTime DateOfBirth { get; set; }
    Sex Sex { get; set; }
    string? TelephoneNumber { get; set; }
    Address? Address { get; set; }
}

public interface IStudent
{
    long Id { get; set; }
    string? FirstName { get; set; }
    string? Surname { get; set; }
    DateTime DateOfBirth { get; set; }
    Sex Sex { get; set; }
    string? TelephoneNumber { get; set; }
    Address? Address { get; set; }
}

From what i understand, T is used to be able to make the method more "flixble", not restricting it to a specific return type.

But when adding "where T : IStudent" - it restricts it to only return a object that inherits the IStudent interface?

Could you not just replace T with IStudent and skip the where?

Plase let me know if i got in wrong

Thanks in advance!

Declare method using T and where [Answered]

This is some code from a reddit post i saw and there are some thing i dont understand.

This is the method:

public static T CreateStudentFromEntity<T>(Student entity) where T : IStudent
        {
            var student = Activator.CreateInstance<T>();

            student.Id = entity.Id;
            student.FirstName = entity.Name;
            student.Surname = entity.Surname;
            student.DateOfBirth = DateTime.Parse(entity.DateOfBirth);
            student.Sex = (Sex)entity.Sex;
            student.Address = CreateAddressFromEntity(entity.Address);

            return student;
        }

public static T CreateStudentFromEntity<T>(Student entity) where T : IStudent
        {
            var student = Activator.CreateInstance<T>();

            student.Id = entity.Id;
            student.FirstName = entity.Name;
            student.Surname = entity.Surname;
            student.DateOfBirth = DateTime.Parse(entity.DateOfBirth);
            student.Sex = (Sex)entity.Sex;
            student.Address = CreateAddressFromEntity(entity.Address);

            return student;
        }

This is the interface that the method uses:

public interface IStudent
{
    long Id { get; set; }
    string? FirstName { get; set; }
    string? Surname { get; set; }
    DateTime DateOfBirth { get; set; }
    Sex Sex { get; set; }
    string? TelephoneNumber { get; set; }
    Address? Address { get; set; }
}

public interface IStudent
{
    long Id { get; set; }
    string? FirstName { get; set; }
    string? Surname { get; set; }
    DateTime DateOfBirth { get; set; }
    Sex Sex { get; set; }
    string? TelephoneNumber { get; set; }
    Address? Address { get; set; }
}

Thanks in advance!

Declare method using T and where [Answered]

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