This must be really simple but just not getting my syntax right here. let's say we have classes like two below:
class Student
{
Subject[] subjects;
}
class Subject
{
string Name;
string referenceBook;
}
Here is my code:
Student univStudent = new Student();
Now, I want to add subjects here but not able to do something like
univStudent.subjects.add(new Subject{....});
How do i add items to this object array?
You can try
Subject[] subjects = new Subject[2];
subjects[0] = new Subject{....};
subjects[1] = new Subject{....};
alternatively you can use List
List<Subject> subjects = new List<Subject>();
subjects.Add(new Subject{....});
subjects.Add(new Subject{....});
// Then you can convert the List to Array like below:
Subject[] arraySubjects = subjects.ToArray<Subject>()
subjects.add may need to be subjects.AddYou can use class System.Array for add new element:
Array.Resize(ref objArray, objArray.Length + 1);
objArray[objArray.Length - 1] = new Someobject();
You can't. However, you can replace the array with a new one which contains the extra element.
But it is easier and gives better performance to use an List<T> (uses interface IList) for this. List<T> does not resize the array every time you add an item - instead it doubles it when needed.
Try:
class Student
{
IList<Subject> subjects = new List<Subject>();
}
class Subject
{
string Name;
string referenceBook;
}
Now you can say:
someStudent.subjects.Add(new Subject());
If you can, use a List<Subject> instead of Subject[]... this will let you do Student.Subject.Add(new Subject()). If that is not possible, you'll have to resize your array... look at Array.Resize() at http://msdn.microsoft.com/en-us/library/bb348051.aspx
I know this is old, but came across it looking for a simpler way, and this is how i do it, just create a new list of the same object and add it to the one you want to use e.g.
Subject[] subjectsList = {new Subject1{....}, new Subject2{....}, new Subject3{....}}
univStudent.subjects = subjectsList ;
You can convert it ToList(), add and then convert it back ToArray().
var subjectList = univStudent.subjects.ToList();
subjectList.Add(new Subject());
univStudent.subjects = subjectList.ToArray();
You can create a list as follows.
List<Subject> allDestek = new List<Subject>() {
new Subject(){ ID = 1, Name = "aaaa"},
new Subject(){ ID = 2, Name = "bbbb"},
new Subject(){ ID = 2, Name = "cccc"},
new Subject(){ ID = 2, Name = "dddd"}
};
allSubject.ToArray()
If data is coming from somewhere (EF,SQL), you can add it in a table as follows.
Stutent[] allStudent = _dataRepository.Subjectes.ToArray();
`
`Here is add method in student class to add subject in student object. I also make an subject object inside student object to add in ADD function and
I change array of subject into List of subjects.````
class Student
{
List<Subject> subjects new List<Subject>();
public static addSubject(string name, string referenceBook){
Subject subject = new Subject();
subject.name=name;
subject.referenceBook=referenceBook;
subjects=Add(subject);
System.Console.WriteLine($"Added Subject: {name} with referenceBook: {referenceBook}");
}
class Subject
{
string Name;
string referenceBook;
}
class Program
{
static void Main(string[] args)
{
Student student = new Student();
Subject subject = new Subject();
System.Console.WriteLine(" Enter Subject name:");
subject.name = Console.ReadLine();
System.Console.WriteLine(" Enter Subject Reference Book:");
subject.referenceBook = Convert.ToDouble(Console.ReadLine());
student.addSubject(subject.name, subject.referenceBook);
}
}
