static void Main()
{
ReadOnlyTest rot = new ReadOnlyTest();
Console.WriteLine(rot.field_1);
Console.WriteLine(rot.field_2);
}
static readonly int field_2 = 25; // now it's a class-wide constant
static void Main()
{
ReadOnlyTest rot = new ReadOnlyTest();
Console.WriteLine(rot.field_1);
Console.WriteLine(ReadOnlyTest.field_2); // access via class name
Console.WriteLine(field_2); // or directly because it is static!
}
static void Main()
{
ReadOnlyTest rot = new ReadOnlyTest();
Console.WriteLine(rot.field_1);
Console.WriteLine(rot.field_2);
rot.field_1 = 2;
rot.field_2 = 26; // this will cause an error
Console.WriteLine(rot.field_1);
Console.WriteLine(rot.field_2);
}
public void Execute()
{
//Read only
//The readonly keyword is a modifier that you can be used on fields. When a field declaration includes a readonly modifier,
//assignments to the fields introduced by the declaration can only occur as part of the declaration or in a constructor in the same class.
//The readonly keyword is different from the const keyword. A const field can only be initialized at the declaration of the field. A readonly field can be
//initialized either at the declaration or in a constructor. Therefore, readonly fields can have different values depending on the constructor used.
//Also, while a const field is a compile-time constant, the readonly field can be used for runtime constants
ReadOnlyTest p1 = new ReadOnlyTest(11, 21, 32); // OK
Console.WriteLine("p1: x={0}, y={1}, z={2}", p1.x, p1.y, p1.z);
ReadOnlyTest p2 = new ReadOnlyTest();
p2.x = 55; // OK
// p2.y = 10; //Not OK
Console.WriteLine("p2: x={0}, y={1}, z={2}", p2.x, p2.y, p2.z);
/*
Output:
p1: x=11, y=21, z=32
p2: x=55, y=25, z=24
*/
}
public static void Main()
{
ReadOnlyTest rt = new ReadOnlyTest();
Console.WriteLine(ReadOnlyTest.DATE_CONSTANT);
}
