C#

Saksida Bojan wrote:

When I think of holding properties, I do not know if I should chose a class or a struct. For example: Button. I want to cache to remember all appearance properties. Is it better to use Class or a struct.

Saksida Bojan wrote:

Is it faster if I call gdi directly instead GDI+?

Saksida Bojan wrote:

Is there a better drawing calls instead of GDI+ for a windows form controls?

Saksida Bojan wrote:

should chose a class or a struct

Saksida Bojan wrote:

Does a class and struct compare by reference

DaveyM69 wrote:

Do you mean pass by reference? Structs(being values) are passed by value and classes are passed by reference, although you can use references with structs by using ref / out.

struct test
{
  public Int32 x;
  public Int32 y;
}

test t1 = new test();
test t2 = new test();
t1.x = 30;
t2.x = 30;
t1.y = 45;
t2.y = 45;

if (t1 == t2) // Does it return true? or if t2.y is 20 returns false?

DaveyM69 wrote:

There are other issues such as recommended size of structs etc. If you do seriously consider using a struct I would do some serious research first and learn about the stack/heap etc...

test t1 = new test();

t1.x = 30;

public struct TestStruct : IEquatable<TestStruct>
{
    public static readonly TestStruct Empty = new TestStruct();

    private int x;
    private int y;

    public TestStruct(int x, int y)
    {
        this.x = x;
        this.y = y;
    }

    public static bool operator ==(TestStruct a, TestStruct b)
    {
        return (a.x == b.x) && (a.y == b.y);
    }
    public static bool operator !=(TestStruct a, TestStruct b)
    {
        return !(a == b);
    }

    public int X
    {
        get { return x; }
    }
    public int Y
    {
        get { return y; }
    }

    public override bool Equals(object obj)
    {
        if (obj is TestStruct)
            return Equals((TestStruct)obj);
        return false;
    }
    public bool Equals(TestStruct other)
    {
        return other == this;
    }
    public override int GetHashCode()
    {
        return x ^ y;
    }
    public override string ToString()
    {
        return string.Format("X={0}, Y={1}", x, y);
    }
}

Saksida Bojan wrote:

Do you know where can i find good reading material for this

public interface ITest
{
    void Test();
}

public class T1 : ITest
{
    public T1(){}
    public virtual void Test()
    {
        MessageBox.Show("From parent");
    }
}

public class T2 : T1
{
    public T2(){}
    public override void Test()
    {
        MessageBox.Show("And I am parent's baby");
    }
}

T1 t1 = new T1();
T2 t2 = new T2();
ITest tt1 = (ITest)t1;
ITest tt2 = (ITest)t2;
t1.Test();
t2.Test();
tt1.Test();
tt2.Test();