C#

class MyClass
{
            Array colorValues = Enum.GetValues(typeof(ColorType));
            Array shapeValues = Enum.GetValues(typeof(ShapeType));
            Polygon[] allPolygons;

            public MyClass()
            {
               allPolygons =  = new Polygon[colorValues.Length * shapeValues.Length];
            ...
            }
}

ssclaire wrote:

static void Main(string[] args) { Array colorValues = Enum.GetValues(typeof(ColorType)); Array shapeValues = Enum.GetValues(typeof(ShapeType)); Polygon[] allPolygons = new Polygon[colorValues.Length * shapeValues.Length];

class Foo
{
  // foreach (var a in b) ... // cant do this here
  void Bar()
  {
    foreach (var a in b) ... // no problem here
  }
}

Hamed Mosavi wrote:

Should new be called (for instance in constructor) before assigning it a value?

string foo = new string();
foo = "bar";

  string foo;

  public string Foo
  {
    get { return foo; }
    set { foo= value; }
  }
...
  // in constructor
  foo = new string();

....

  class.Foo = "string";

Hamed Mosavi wrote:

The problem with me is my c++ background. Here foo in fact seems like a pointer. I ask myself do I need to make it point to somewhere before using it? Will the compiler calls new automatically. If I had more time, I would not post this question, but rather investigate MSIL code to find it out.

Thank you for reply. [Rose]

Greeeg wrote:

This is a quite interesting question, actually. Since String is a class, you'd usually expect that you have to create a new instance when assigning a value to it

string s = null;
string anotherString = s.Trim();

Greeeg wrote:

This is a quite interesting question, actually. Since String is a class, you'd usually expect that you have to create a new instance when assigning a value to it (at least that's what you have to do with "normal" classes).

Greeeg wrote:

I guess that the ldstr opcode in MSIL does have a special meaning for the .NET String keyword

Guffa wrote:

A string reference works just like a reference to any other class. You don't use the new keyword when assigning a reference, it's used to create an instance of a class. If the instance already exists, you just assign it's reference to the variable, and that is what happens most of the time when you are using a string.

<code>public static bool Test()
{
    string s1 = "hello";
    string s2 = s1;

    s1 = "world";
    return s1.Equals(s2);
}</code>