CODEWITHSUNDEEP
c#c#-4.0
atoipowered
atoipowered

Reputation: 506

Difference between a constructor with no arguments with a constructor with default arguments

What is the difference between these two fractions in C# 5.0 (both to the programmer and to the compiler and CLR):

public MyClass()
{
    ;   // empty
}

public MyClass(int number = 1, string text = "hello")
{
    ;   // empty
}

Upvotes: 0

Views: 89

Answers (2)

Rico Suter
Rico Suter

Reputation: 11858

If you call the second ctor, then the generated MSIL contains the default parameters, like you had directly called the ctor with two parameters.

Default parameter values are only syntactical sugar of C#... and should not be used. Use overloaded methods/ctors instead.

Have a look at http://lostechies.com/jimmybogard/2010/05/18/caveats-of-c-4-0-optional-parameters/

Upvotes: 1

James Ralston
James Ralston

Reputation: 1208

It is just like any function, the constructor with parameters will need them. The compiler will automatically add a default constructor if none is provided, but only if no other constructor definition is supplied. If you include a constructor with parameters, you can no longer use the default constructor and must explicitly define it.

Upvotes: 0

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