The IList<T> interface in C# is a common interface in the .NET framework that defines a set of elements that can use the type parameter T at runtime. The IList<T> interface provides methods to add, delete, and find elements, as well as access and manipulate attributes of indexes of elements in a list. To implement the IList<T> interface, you can follow the following steps:
1. Declare a class and implement the IList<T> interface
Declare a class and implement the IList<T> interface. In the class declaration, use the: IList<T> syntax to specify the implementation of the interface. For example:
using ;
public class MyList<T> : IList<T>
{
// Methods and properties of IList<T> interface}2. Implement the properties of the IList<T> interface
The IList<T> interface has two properties: Count and IsReadOnly. The Count property returns the number of elements in the list, and the IsReadOnly property returns a value indicating whether the list is read-only. For example:
private List<T> list = new List<T>();
public int Count
{
get { return ; }
}
public bool IsReadOnly
{
get { return false; }
}3. Methods to implement IList<T> interface
The IList<T> interface defines many methods, including methods to add, delete, find and replace elements. Here are some implementation examples:
public void Add(T item)
{
(item);
}
public void Clear()
{
();
}
public bool Contains(T item)
{
return (item);
}
public int IndexOf(T item)
{
return (item);
}
public void Insert(int index, T item)
{
(index, item);
}
public bool Remove(T item)
{
return (item);
}
public void RemoveAt(int index)
{
(index);
}4. Implement the indexer for IList<T> interface
The IList<T> interface defines an indexer that allows access to elements in a list through the index. The indexer is implemented as follows:
public T this[int index]
{
get
{
return list[index];
}
set
{
list[index] = value;
}
}5. Main program design
In the class constructor, you can initialize the list and add some sample data. For example:
public MyList()
{
// Initialize the list and add some sample data (1);
("Hello");
(3.14);
}After completing the above steps, you can create a class that implements the IList<T> interface. This class can be used as a list in other code, for example:
MyList<int> myList = new MyList<int>(); (4); myList[1] = 2;
6. Complete example
Here is a complete example that implements the IList<T> interface. In this example, a class named MyList<T> is created that implements the IList<T> interface and uses integer types as an example:
// Complete example of IList<T> interface designusing ;
namespace _121_1
{
public class MyList<T> : IList<T>
{
private readonly List<T> list = [];
public int Count
{
get { return ; }
}
public bool IsReadOnly
{
get { return false; }
}
public void Add(T item)
{
(item);
}
public void Clear()
{
();
}
public bool Contains(T item)
{
return (item);
}
public int IndexOf(T item)
{
return (item);
}
public void Insert(int index, T item)
{
(index, item);
}
public bool Remove(T item)
{
return (item);
}
public void RemoveAt(int index)
{
(index);
}
public void CopyTo(T[] array, int arrayIndex)
{
throw new NotImplementedException();
}
//A class must implement all members of the interface it derived, otherwise it will be declared abstract //The comment part is an incorrect iterator design, and it cannot be ignored. Warn CS0535 after commenting //public IEnumerator<T> GetEnumerator()
//{
// throw new NotImplementedException();
//}
//IEnumerator ()
//{
// throw new NotImplementedException();
//}
/// <summary>
/// The most important iterator interface design /// </summary>
public IEnumerator<T> GetEnumerator()
{
for (int i = 0; i < ; i++)
{
yield return list[i];
}
}
IEnumerator ()
{
return GetEnumerator();
}
public T this[int index]
{
get
{
return list[index];
}
set
{
list[index] = value;
}
}
/// <summary>
/// (1), Warning CS1503 cannot convert int to T /// Must be replaced as follows /// </summary>
public MyList()
{
// Initialize the list and add some sample data ((T)(object)1); // cast 1 to T type ((T)(object)2); // cast 2 to T type ((T)(object)3); // cast 3 to T type }
}
class Program
{
static void Main(string[] args)
{
(args);
MyList<int> myList = [];
("Initial list: {0}", (", ", myList));
(4);
("Add elements4The following list: {0}", (", ", myList));
myList[1] = 8;
("To index1Replace the element at2The following list: {0}", (", ", myList));
();
}
}
}
// Running results:/*
Initial list: 1, 2, 3
List after adding element 4: 1, 2, 3, 4
Replace the element at index 1 with the list after 2: 1, 8, 3, 4
*/7. General steps for iterator design of inherited interfaces
The iterator consists of two parts:
public IEnumerator<T> GetEnumerator()
{
//
}and
IEnumerator ()
{
//
}To implement this method, you need to create an enumerator class that implements the IEnumerator<T> interface and uses the Current attribute and MoveNext() method defined by the IEnumerator<T> interface. Here is a simple example:
// Iterator design, general methodusing ;
namespace _121_2
{
internal class Program
{
private static void Main(string[] args)
{
(args);
List<int> list = [1, 2, 3, 4, 5];
MyEnumerable<int> myEnumerable1 = new(list);
MyEnumerable<int> myEnumerable = myEnumerable1;
foreach (int item in myEnumerable)
{
(item);
}
}
}
/// <summary>
/// Iterator design /// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list"></param>
public class MyEnumerable<T>(List<T> list) : IEnumerable<T>
{
private readonly List<T> _list = list;
public IEnumerator<T> GetEnumerator()
{
for (int i = 0; i < _list.Count; i++)
{
yield return _list[i];
}
}
IEnumerator ()
{
return GetEnumerator();
}
}
}
//Run result:/*
1
2
3
4
5
*/In this example, the MyEnumerable class implements the IEnumerable<T> interface and defines a GetEnumerator() method that returns an enumerator object. The enumerator object uses the yield keyword to return each element in the list. There is also a non-generic GetEnumerator() method, which calls the generic version of GetEnumerator() method to meet the requirements of the IEnumerable interface.
To use this class, you can create a MyEnumerable<T> object and pass a List<T> object. Then use foreach to loop through the MyEnumerable object and output each element in the list. As designed by the main program in the example above.
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