enum-type enum usage in C #

To define a simple enumeration type:
enum        Days {Sat, Sun, Mon, Tue, Wed, Thu, Fri}; At this time Days.sat = 0, followed by this increment.

Of course, you can also specify the starting value manually:
enum Days {sat=1, Sun, Mon, Tue, Wed, Thu, Fri}; That's starting with 1.

The implied type of the enum type is int, such as int x= (int) Days.sat; Not a bit of a problem.        According to MSDN, the implied type of an enumeration type can be any number type other than char ... [Every enumeration type has a underlying type, which can be any integral type except char.]
The following routines demonstrate the use of long integers as an implicit type of enumeration:

//Keyword_enum2.cs
Using Long Enumerators
usingSystem;
Public classEnumtest
{
enum range:long {Max = 2147483648L, Min = 255L};
static voidMain ()
{
Longx = (Long)Range.max;
Longy = (Long)range.min;
Console.WriteLine("Max = {0}", x);
Console.WriteLine("Min = {0}", y);
}
}
If you need to retrieve the long-shaped value again, it is a conversion.Longx = (Long)Range.max;

The most interesting thing is to say the following, the [flags] tag of the enum. Don't say anything, look at the program:
//the Following code example illustrates the use and effect of the
System.FlagsAttribute attribute on an enum declaration.

//EnumFlags.cs
//Using the FlagsAttribute on enumerations.
usingSystem;

[flags ]
public enum   FileAttribute
{
         readonly= 0x01,
          hide= 0x02,
         system= 0x04,
         archived= 0x08
}

CLASS  flagtest
{
    static void  main ()
         {
         fileattributeoptions  options= < Span style= "color: #333399;" >fileattribute . Readonly| fileattribute . System;
        console . writeline (options);
        console . writeline ((int ) options);
        }
}

The output is:

ReadOnly, System
5
Did you see that? Oh. This is a common sign-in C # has become more easy to use.

There are enum days {Sat, Sun, Mon, Tue, Wed, Thu, Fri};

1> I give a value of 1, how to return the corresponding sun as a string? (used when taking xxx_id in a database and converting it to a corresponding value.) --but a little hard-coded feeling. ）
Answer: Convert.changetype (Enumvalue, enumtype). ToString ();//enumvalue=1; Enumtype=typeof (days)

2> I given a string "Sun", how do I return to the enum Day.sun?
Answer: You can use Enum.parse (Enumtype, String,[boolean]) to solve the problem directly. For example, Enum.parse (day), "Sun", True) returns Day.sun, and the 3rd parameter specifies whether the case is sensitive or not. can be omitted.

3> I want to know all the string values in Enum day. How to write?
A: This looks very simple, too, foreach (string name in Enum.getnames (typeof)) Console.WriteLine (name); There is also a enum.getname (), specific usage see MSDN go ....

Source: http://blog.163.com/li_crane/blog/static/19502097200822210217451/

enum-type enum usage in C #