public static void TestEnums()
{
#region enum instances methods
EmpType emp1 = EmpType.Manager;
// ------------------------< obj.ToString() >------------------------
Console.WriteLine(emp1);
Console.WriteLine($"emp1.ToString() = {emp1.ToString()}");
// ------------------------< obj.GetType() >------------------------
Console.WriteLine($"emp1.GetType() = {emp1.GetType()}"); //pro_csharp_book_training.EmpType
// ------------------------< obj.GetTypeCode() >------------------------
Console.WriteLine($"emp1.GetTypeCode() = {emp1.GetTypeCode()}"); //Int32
// ------------------------< obj.CompareTo(object target) >------------------------
// NOTE: target argument should be in the same type of enumeration
Console.WriteLine($"emp1.CompareTo(EmpType.Manager) = {emp1.CompareTo(EmpType.Manager)}"); // 0
Console.WriteLine($"emp1.CompareTo(EmpType.SalesPersom) = {emp1.CompareTo(EmpType.SalesPersom)}"); // -1
//Error:passing string not EmptType
//Console.WriteLine($@"emp1.CompareTo(""Manager"") = {emp1.CompareTo("Manager")}");
//Error:passing int not EmptType
//Console.WriteLine($"emp1.CompareTo(0) = { emp1.CompareTo(0)}");
// ------------------------< obj.Equals(object target) >------------------------
// Equals : it accepts underline storage or enum constant name,
// so it doesn't throw Exception in Type Mismatch
Console.WriteLine($"emp1.Equals(EmpType.Manager) = {emp1.Equals(EmpType.Manager)}"); // True
Console.WriteLine($"emp1.Equals(EmpType.SalesPersom) = {emp1.Equals(EmpType.SalesPersom)}"); // False
Console.WriteLine($"emp1.Equals(1) = {emp1.Equals(1)}"); // False
Console.WriteLine($@"emp1.Equals(""Managers"") = {emp1.Equals("Manager")}"); // False
#endregion
#region Get Type of enum
// ------------------------< System.Enum Class Functionality >------------------------
// -------------------------------------------------------------------------------------
Console.WriteLine($"Enum.GetUnderlyingType(typeof(EmpType)) = {Enum.GetUnderlyingType(typeof(EmpType))} "); // Int32
#endregion
#region Array Enum.GetValues(Type enumtype);
// ------------------------< public static Array GetValues(Type enumType); >------------------------
Console.WriteLine("1- Array empItems = Enum.GetValues(typeof(EmpType))");
Array empItems = Enum.GetValues(typeof(EmpType));
foreach (EmpType item in empItems)
{
Console.WriteLine($"Name: {item} , Value: {(int)item}");
}
Console.WriteLine();
// ------------------------< public static Array GetValues(Type enumType); >------------------------
// The same as the last code but here we see some changes
Console.WriteLine("2- Array empItems = Enum.GetValues(typeof(EmpType))");
empItems = Enum.GetValues(typeof(EmpType));
for (int i = 0; i < empItems.Length; i++)
{
Console.WriteLine("Name: {0} , Value: {0:D}", empItems.GetValue(i));
}
Console.WriteLine();
// ------------------------< public static Array GetValues(Type enumType); >------------------------
// The same as the last code but here we see some changes
Console.WriteLine("3- Enum.GetValues(emp1.GetType())");
foreach (EmpType item in Enum.GetValues(emp1.GetType()))
{
//Console.WriteLine($"Name: {item} , Value: {(int)item}");
Console.WriteLine("Name: {0} , Value: {1}", item, (int)item);
}
Console.WriteLine();
#endregion
#region public static string[] GetNames(Type enumType)
// ------------------------< public static string[] GetNames(Type enumType); >------------------------
Console.WriteLine("Enum.GetNames()");
foreach (string item in Enum.GetNames(typeof(EmpType)))
{
Console.WriteLine($"{item}");
}
Console.WriteLine();
#endregion
#region public static string GetName(Type enumType, object value);
// ------------------------< public static string GetName(Type enumType, object value); >------------------------
Console.WriteLine("Enum.GetName(typeof(EmpType),0) = {0}", Enum.GetName(typeof(EmpType), 0));
#endregion
#region public static object Parse(Type enumType, string value);
// ------------------------< public static object Parse(Type enumType, string value); >------------------------
Console.WriteLine("public static object Parse(Type enumType, string value);");
emp1 = EmpType.SalesPersom;
Console.WriteLine(emp1.ToString());
emp1 = (EmpType)Enum.Parse(typeof(EmpType), "Manager");
Console.WriteLine(@"Enum.Parse(typeof(EmpType),""Manager"") = " + emp1);
emp1 = (EmpType)Enum.Parse(typeof(EmpType), "2");
Console.WriteLine(@"Enum.Parse(typeof(EmpType),""2"") = " + emp1);
#endregion
#region public static bool TryParse<TEnum>(string value, out TEnum result) where TEnum : struct;
// -----< public static bool TryParse<TEnum>(string value, out TEnum result) where TEnum : struct; >------
if (Enum.TryParse("PTSalesPerson", out EmpType emp2))
{
Console.WriteLine($"TryParse string (PTSalesPerson) Result:");
WriteEnum(emp2);
}
else
{
Console.WriteLine("Can't Parse string");
}
if (Enum.TryParse("2", out emp2))
{
Console.WriteLine($"TryParse integer 2 Result:");
WriteEnum(emp2);
}
else
{
Console.WriteLine("Can't Parse integer");
}
#endregion
#region public static object ToObject(Type enumType, int value);
// -----< public static object ToObject(Type enumType, int value); >------
Console.WriteLine(new StringBuilder().Append('=', 30));
Console.WriteLine("public static object ToObject(Type enumType, int value);");
// To convert integer any provided value type to enum
EmpType emp3 = (EmpType)Enum.ToObject(typeof(EmpType), 2);
WriteEnum(emp3);
WriteEnumNameValuePair(emp3.GetType());
#endregion
#region public static bool IsDefined(Type enumType, object value);
// -----< public static bool IsDefined(Type enumType, object value); >------
Console.WriteLine();
Console.WriteLine("public static bool IsDefined(Type enumType, object value);");
Console.WriteLine($@"Enum.IsDefined(typeof(Day),""Sat"") = {Enum.IsDefined(typeof(Day),"Sat")}");
Console.WriteLine($@"Enum.IsDefined(typeof(Day),""sat"") = {Enum.IsDefined(typeof(Day), "sat")}");
Console.WriteLine($@"Enum.IsDefined(typeof(Day),""Moamen"") = {Enum.IsDefined(typeof(Day), "Moamen")}");
Console.WriteLine();
#endregion
#region public static string Format(Type enumType, object value, string format);
//-----< public static string Format(Type enumType, object value, string format); >------
// Format Description
//"G" or "g" If value is equal to a named enumerated constant,
// the name of that constant is returned; otherwise,
// the decimal equivalent of value is returned.
// For example, suppose the only enumerated constant is named Red,
// and its value is 1.If value is specified as 1, this format returns "Red".However,
// if value is specified as 2, this format returns "2".
///////////////// there are another part here in Microsoft APIs about FlagsAttribute.
// "X" or "x" Represents value in hexadecimal format without a leading "0x".
// "D" or "d" Represents value in decimal form.
// "F" or "f" Behaves identically to "G" or "g", except that
// the FlagsAttribute is not required to be present on the Enum declaration.
Console.WriteLine("------------------- General Format --------------------");
Console.WriteLine($@"Enum.Format(Day, Day.Sat,""G"") = {Enum.Format(typeof(Day), Day.Sat, "G")}");
Console.WriteLine($@"Enum.Format(Day, Day.Sun,""G"") = {Enum.Format(typeof(Day), Day.Sun, "G")}");
Console.WriteLine($@"Enum.Format(Day, Day.Mon,""G"") = {Enum.Format(typeof(Day), Day.Mon, "G")}");
Console.WriteLine("------------------- Decimal Format --------------------");
Console.WriteLine($@"Enum.Format(Day, Day.Sat,""D"") = {Enum.Format(typeof(Day), Day.Sat, "D")}");
Console.WriteLine($@"Enum.Format(Day, Day.Sun,""D"") = {Enum.Format(typeof(Day), Day.Sun, "D")}");
Console.WriteLine($@"Enum.Format(Day, Day.Mon,""D"") = {Enum.Format(typeof(Day), Day.Mon, "D")}");
Console.WriteLine("------------------- HexDecimal Format --------------------");
Console.WriteLine($@"Enum.Format(Day, Day.Sat,""x"") = {Enum.Format(typeof(Day), Day.Sat, "x")}");
Console.WriteLine($@"Enum.Format(Day, Day.Sun,""x"") = {Enum.Format(typeof(Day), Day.Sun, "x")}");
Console.WriteLine($@"Enum.Format(Day, Day.Mon,""x"") = {Enum.Format(typeof(Day), Day.Mon, "x")}");
#endregion
// Test: public static void WriteEnumNameValuePair(Type enumType);
WriteEnumNameValuePair(emp2.GetType());
WriteEnumNameValuePair(typeof(Day));
}