What is the need for Decorator Pattern in C# (C Sharp)?

If you want to dynamically add additional tasks to an object, then you can do it using Decorator pattern. Here is a code sample to demonstrate how to use decorators:

class sampleClass {
public virtual void sampleMethod() {
Console.WriteLine(“Executing sampleMethod of sampleClass”);
}
}
abstract class decoratorClass:sampleClass {
protected sampleClass sampleObj;
public sampleClass SampleObj {
set { sampleObj = value; }
}
public override void sampleMethod() {
if (sampleObj != null) { sampleObj.sampleMethod(); }
}
}
class derivedDecorator:decoratorClass {
public override void sampleMethod() {
base.sampleMethod();
AddedActivity();
}
public void AddedActivity() {
Console.WriteLine(“Executing additional behavior using decorators”);
}
}
class testClass {
public static void Main() {
sampleClass obj = new sampleClass();
derivedDecorator dObj = new derivedDecorator();
dObj.SampleObj = obj;
dObj.sampleMethod();
}
}

Output of this code will be:

Executing sampleMethod of sampleClass
Executing additional behavior using decorators

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