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Generic method overloading

Introduction

I would like to introduce generic method overloading.

It would be good for you to already understand generics in C# but if not then please visit the following link.

Basics of Generic Classes in C#

First we will understand simple overloading then move towards generic overloading.

Steps and code

Add the following class to the project:
1.  public class SimpleClass  
2.  {  
3.      public void GetData(int x)  
4.      {  
5.          Console.WriteLine("INSIDE GetData and Datetype:" + x.GetType().Name);  
6.      }  
7.    
8.      public void GetData(string xStr)  
9.      {  
10.         Console.WriteLine("INSIDE GetData and Datetype:" + xStr.GetType().Name);  
11.     }  
12. }  

Program.cs
1.  class Program  
2.  {  
3.      static void Main(string[] args)  
4.      {  
5.          SimpleClass o = new SimpleClass();  
6.          o.GetData(345);  
7.          o.GetData("Devesh is testing the code");  
8.          Console.ReadKey();  
9.      }  
10. }  

Running the Code

The following will be the output:





Understanding the code

We have created the GetData function with overloaded functions having integer and string parameters.

When we passed an integer to the method first GetData (int x ) is called else if we passed a string then GetData(string xStr) is called.


Now we have a basic knowledge of method overloading.

Let us move towards Generic Method Overloading.

Now we are updating the GetData() method as a generic method.
1.  public void GetData<T>(T obj)  
2.  {  
3.      Console.WriteLine("INSIDE GetData<T>,"+ obj.GetType().Name);  
4.  }  

The following would be the complete code:
1.  public class SimpleDemoClass  
2.  {            

3.       public void GetData<T>(T obj)  
4.       {  
5.          Console.WriteLine("INSIDE GetData<T>,"+ obj.GetType().Name);  
6.       }        

7.       public void GetData(int x)  
8.       {  
9.          Console.WriteLine("INSIDE GetData" + x.GetType().Name);  
10.      }        

11.      public void GetxNextData<T>(T obj)  
12.      {  
13.          GetData(obj);  
14.      }      

15.  }  

Program.cs
1.  class Program  
2.  {  
3.        Static void Main(string[] args)  
4.        {    

5.             SimpleDemoClass sobj = new SimpleDemoClass();  
6.             sobj.GetData("data is for testing by-Devesh");  
7.             sobj.GetData(95);  
8.             sobj.GetxNextData(1234);  
9.             Console.ReadKey();  
10.        }  
11. }  

Running code






Understanding the code.
  • When we called sobj.GetData("data is for testing by-Devesh");
  • Getdata<T>(T obj) is called. Because we are passing a string and this is implicitly an object
  • When we called sobj.GetData(95);, GetData(int x ) is called because we are passing an integer to the GetData method.
  • During runtime, the compiler decides to invoke the best sutiable method to be invoked
Conclusion

Here we learned the basics of generic method overloading.


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