What is the need for Composite Pattern in C#?

In Object Oriented Programming and UML, you might be familiar with the composition relationship which is used to establish whole-part relationship. This composition relationship can be achieved in C# application by implementing Composite Pattern.

Composite Pattern ensures that both individual objects and composite objects are treated in the same way and the User will not be aware if he is accessing an individual object or composite object. Here is a sample snippet showing how a tree structure can be created:

class testClass {
public static void Main() {
compositeClass rootNode = new compositeClass(“RootNode”);
rootNode.AddNode(new primitiveClass(“NodeA”));
primitiveClass obj = new primitiveClass(“NodeB”));
rootNode.AddNode(obj);
rootNode.RemoveNode(obj);
rootNode.DisplayTreeStructure();
}
}

In the above example, compositeClass is a class using which the tree structure can be constructed. This class includes several methods namely AddNode to add an object to the current node, RemoveNode to remove the specific object from the current node, DisplayTreeStructure method to display all the objects/nodes that exist in the tree structure. The objects that get added to the tree belong to a class named primitiveClass.

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