public int CompareTo(GameDateTime other)
{
if (ReferenceEquals(other, null))
{
return(1);
}
if (Year != other.Year)
{
return(Year.CompareTo(other.Year));
}
if (Season != other.Season)
{
return(Season.CompareTo(other.Season));
}
if (DayOfMonth != other.DayOfMonth)
{
return(DayOfMonth.CompareTo(other.DayOfMonth));
}
if (TimeOfDay != other.TimeOfDay)
{
return(TimeOfDay.CompareTo(other.TimeOfDay));
}
return(0);
}
public int CompareTo(Session other)
{
var ct = Year.CompareTo(other.Year) * -1;
if (ct == 0)
{
ct = Season.CompareTo(other.Season);
}
return(ct);
}
public static void Main(string[] args)
{
//Enumerations:
//Object type, limited to a set of values:
Season season1 = Season.Summer;
//You can use enum values in a switch-case statements:
switch (season1)
{
case Season.Spring:
//…
break;
case Season.Summer:
//…
break;
case Season.Autumn:
//…
break;
case Season.Winter:
//…
break;
}
//Underlying value of this enum is int:
if (season1 == Season.Spring)
{
Console.WriteLine((int)season1); //0
}
//GetValues() – returns an array with all constants:
Array seasons = Enum.GetValues(typeof(Season)); //Връща целите обекти в масива.
string[] names = Enum.GetNames(typeof(Season)); //Връща масив от имената.
//Enum Parse:
//A string value can be convert to an equivalent enum:
Season s1 = (Season)Enum.Parse(typeof(Season), "Summer"); //Summer. Трябва да го кастнем към Enum.
//A int value have to be parsed to string first and then to enum:
int number = 1;
Season s2 = (Season)Enum.Parse(typeof(Season), number.ToString()); //Summer
//Safety convert to enum:
Season season2;
if (Enum.TryParse("1", out season2))
{
Console.WriteLine(season2); // Summer
}
if (Enum.TryParse("9", out season2))
{
Console.WriteLine(season2); // 9 - ако няма Enum с такъв int, не гърми а връща цифрата.
}
if (Enum.TryParse("Dog", out season2))
{
Console.WriteLine(season2); // Ако подадем string, който не съответства на името на никой Enum, нищо не се случва.
}
//Comparing Enums:
Season season3 = Season.Summer;
Season season4 = Season.Winter;
Console.WriteLine(season3.CompareTo(season4)); //Comparison of ordinal values -> -1
//Attributes:
// Data holding class.
// Describes parts of your code.
// Applied to: Classes, Fields, Methods, etc.
//Attributes Usage:
// Generate compiler messages or errors.
// Tools:
// Code generation tools.
// Documentation generation tools.
// Testing Frameworks
// Runtime – ORM, Serialization etc.
//Example:
//[Flags] attribute indicates that the enum type can be treated like a set of bit flags stored as a single integer.
//[Obsolete] - предупреждение за остарял код още по време на компилацията.
//Attributes with Parameters:
//Attributes can accept parameters for their constructors and public properties.
// [DllImport("user32.dll", EntryPoint="MessageBox")]
//Set a Target to an Attribute:
// [assembly: AssemblyTitle("Attributes Demo")]
// [assembly: AssemblyCompany("DemoSoft")]
// [assembly: AssemblyProduct("Enterprise Demo Suite")]
// [assembly: AssemblyVersion("2.0.1.37")]
//Custom Attributes:
// Must inherit the System.Attribute class
// Their names must end with "Attribute"
// Possible targets must be defined via[AttributeUsage]
// Can define constructors with parameters
// Can define public fields and properties
}
public int CompareTo(Semester other) => year == other.year ? season.CompareTo(other.season) : year.CompareTo(other.year);
