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Understanding Some C # Codes

I read one of the streams only on this site, and I saw some unusual class definition that I could not understand well. Can someone please explain to me what this definition means?

public class Node<T> where T : class
{     
  public Node<T> Next { get; set; }    
  public T Value { get; set; }     
  public Node(T value)     
  { 
    Next = null;
    Value = value;    
  } 
}

especially where it says

public class Node<T> where T : class
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7 answers

This is a definition of a generic class with a generic parameter T with the restriction that T must be a class (reference type).

This essentially means that when creating an instance of Node, you can do

new Node<String>(someStringVar)

but you cannot do

new Node<int>(someIntVar)
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It is defined Nodeas a generic class , where the generic type is T restricted to reference types only.

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where T : class , T struct ( , int).

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, node, node . T T: . T .

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generics

where T : class

, , , , . (, <int> )

Next Node<T>. Size , , Node<Size>.

public Node<T> Next { get; set; }

:

public T Value { get; set; }

,

public Size Value { get; set; }

. generics MSDN

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T - . .

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T . , T class, struct.

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