cegonsoft.net | Method Overloading in C#

[MikeHenery9]

C# supports method overloading, which allows you to create more than one method with the
same name, but with a different set of parameters. When you call the method, the CLR automatically
chooses the correct version by examining the parameters you supply.

This technique allows you to collect different versions of several methods together. For
example, you might allow a database search that returns an array of Product objects representing
records in the database. Rather than create three methods with different names
depending on the criteria, such as GetProducts(), GetCategory(), and
GetPrice(), you could create three versions of the GetPrice() method. Each
method would have the same name but a different signature, meaning it would require different
parameters. This example provides two overloaded versions for the GetPrice()
method:

private decimal GetPrice(int ID)
{
// Code here.
}
private decimal GetPrice(string name)
{
// Code here.
}

// And so on...
Now you can look up product prices based on the unique product ID or the full product
name, depending on whether you supply an integer or string argument:

decimal price;
// Get price by product ID (the first version).
price = GetPrice(2047);
// Get price by product name (the second version).
price = GetPrice("Air conditioner");

Note : You cannot overload a method with versions that have the same signature—that is, the
same number of parameters and parameter data types—because the CLR will not be able to
distinguish them from each other. When you call an overloaded method, the version that
matches the parameter list you supply is used. If no version matches, an error occurs.

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[gabrilla]

A lot of programming languages supports a technique called default/optional parameters. It allows the programmer to make one or several parameters optional, by giving them a default value. It's especially practical when adding functionality to existing code. For instance, you may wish to add functionality to an existing function, which requires one or more parameters to be added. By doing so, you would break existing code calling this function, since they would now not be passing the required amount of parameters. To work around this, you could define the newly added parameters as optional, and give them a default value that corresponds to how the code would work before adding the parameters.

As of writing this, C# does not support default parameters. They have been announced for C# version 4.0, but up until that, C# coders have been using a different technique, which basically does the same, called method overloading. It allows the programmer do define several methods with the same name, as long as they take a different set of parameters. When you use the classes of the .NET framework, you will soon realize that method overloading is used all over the place. A good example of this, is the Substring() method of the String class. It is with an extra overload, like this:

string Substring (int startIndex)
string Substring (int startIndex, int length)

You can call it with either one or two parameters. If you only call it with one parameter, the length parameter is assumed to be the rest of the string, saving us time whenever we simply want to get the last part of a string.

So, by defining several versions of the same function, how do we avoid having the same code several places? It's actually quite simple: We let the simple versions of the method make the complex version of it do all the work. Consider the following example:

class SillyMaths
{
public static int Plus(int number1, int number2)
{
return Plus(number1, number2, 0);
}

public static int Plus(int number1, int number2, int number3)
{
return number1 + number2 + number3;
}
}


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[Alastair]

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final year projects

[madhusundar]

C# is Microsoft's new programming language for the .NET platform.
It combines some of the best features of modern programming languages such as Java, C++ or Visual Basic.
C# is an object-oriented language with single inheritance but multiple interfaces per class.
It supports component-based programming by properties (smart fields), events and delegates (enhanced function pointers).
C# is fully interoperable with other .NET languages such as VB.NET, Eiffel.NET or Oberon.NET.


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[Twinklestar]

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[madhusundar]

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[Catalin]

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[madhusundar]

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[lucabrazi]

Method overloading woud be useful for the student projects..

[madhusundar]

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