public static void ValRefTypesDemo()
{
EvilStruct es1 = new EvilStruct();
//es1.PointRef = new PointRef() { X = 1, Y = 2 };
//es1.PointRef.X = 1;
//es1.PointRef.Y = 2;
EvilStruct es2 = es1;
Console.WriteLine($"es1.PointRef.X ={es1.PointRef.X}, es1.PointRef.Y ={es1.PointRef.Y}");
Console.WriteLine($"es2.PointRef.X ={es2.PointRef.X}, es2.PointRef.Y ={es2.PointRef.Y}");
es2.PointRef.X = 42;
es2.PointRef.Y = 45;
Console.WriteLine($"es1.PointRef.X ={es1.PointRef.X}, es1.PointRef.Y ={es1.PointRef.Y}");
Console.WriteLine($"es2.PointRef.X ={es2.PointRef.X}, es2.PointRef.Y ={es2.PointRef.Y}");
PointVal a; // same as PointVal a = new PointVal();
a.X = 3;
a.Y = 5;
PointVal b = a;
b.X = 7;
b.Y = 10;
a.LogValues();
b.LogValues();
Console.WriteLine("After structers");
PointRef c = new PointRef();
c.X = 3;
c.Y = 5;
PointRef d = c;
d.X = 7;
d.Y = 10;
c.LogValues();
d.LogValues();
}
static void NRE_NullableValTypeDemo()
{
PointVal?pv = null;
if (pv.HasValue)
{
PointVal pv2 = pv.Value;
Console.WriteLine(pv.Value.X);
Console.WriteLine(pv2.X);
}
else
{
}
PointVal pv3 = pv.GetValueOrDefault();
PointRef c = null;;
Console.WriteLine(c.X); //NullReferenceException
}