Hi to everybody.

I'm creating a structure to access to a database. My structure has more or less the next format:

public struct mystruct
{
      type1 tuple1;
      type2 tuple2;
      ...
}

I want to use this struct as an argument for a function that inserts this register in a table. Something like:

      mystruct struc25 = new mystruct();
      myfunct(struc25);

My problem is how can i send this argument to my function with default values.

Should I initialize my structure before sending:

      mystruct struc25 = new mystruct();
      struc25.tuple1=valuedefault1;
      struc25.tuple2=valuedefault2;
      ...
      myfunct(struc25);

or can i someway do this initialization inside the declaration of the struct, and then do just:

      mystruct struc25 = new mystruct();
      myfunct(struc25);


thank you very much for your help

                    silvia

Hi, Sylvia.
There are two types of structuring data in C#, structs and classes
structs are not allowed to have a default constructor and for you even worse, in a function call all data are copied. (value semantics).
Using classes you will pass by reference
brgds

Structs may be a value type, but you CAN still use constructors (default and parameter ctors).
You can use the following code within your struct:

    mystruct(){
        tuble1 = val1;
        tuble2 = val1;
    }
    mystruct( type1 val1, type2 val2){
        tuble1 = val1;
        tuble2 = val2;
    }

You can call your constructor through initialization:

    mystruct struc25 = new mystruct();
    mystruct struc25 = new mystruct( val1, val2 );


By using the “new” keyword we are not actually instantiating the struct, instead we are calling the struct constructor.
Even though structs are value types (value semantics) C# has giving them functionality similar to a class.

One small error.

Structs can NOT have a default Constructor, but CAN have Ctors with parameters.
Reason being; There are some rare circumstances in which the runtime may not call the default ctor, therefore MS has banned zero parameter ctors from structs.

mystruct() is incorrect.
mystruct( val1, val2 ) is still correct.

thank you very much for your help boys :)