本文整理汇总了C#中System.Enum类的典型用法代码示例。如果您正苦于以下问题：C# Enum类的具体用法？C# Enum怎么用？C# Enum使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
Enum类属于System命名空间，在下文中一共展示了Enum类的13个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
//引入命名空间
using System;
public class EnumTest {
enum Days { Saturday, Sunday, Monday, Tuesday, Wednesday, Thursday, Friday };
enum BoilingPoints { Celsius = 100, Fahrenheit = 212 };
[Flags]
enum Colors { Red = 1, Green = 2, Blue = 4, Yellow = 8 };
public static void Main() {
Type weekdays = typeof(Days);
Type boiling = typeof(BoilingPoints);
Console.WriteLine("The days of the week, and their corresponding values in the Days Enum are:");
foreach ( string s in Enum.GetNames(weekdays) )
Console.WriteLine( "{0,-11}= {1}", s, Enum.Format( weekdays, Enum.Parse(weekdays, s), "d"));
Console.WriteLine();
Console.WriteLine("Enums can also be created which have values that represent some meaningful amount.");
Console.WriteLine("The BoilingPoints Enum defines the following items, and corresponding values:");
foreach ( string s in Enum.GetNames(boiling) )
Console.WriteLine( "{0,-11}= {1}", s, Enum.Format(boiling, Enum.Parse(boiling, s), "d"));
Colors myColors = Colors.Red | Colors.Blue | Colors.Yellow;
Console.WriteLine();
Console.WriteLine("myColors holds a combination of colors. Namely: {0}", myColors);
}
}示例2: Main
public class Example
{
public static void Main()
{
ArrivalStatus status = ArrivalStatus.OnTime;
Console.WriteLine("Arrival Status: {0} ({0:D})", status);
}
}输出：
Arrival Status: OnTime (0)
示例3:
int value3 = 2;
ArrivalStatus status3 = (ArrivalStatus) value3;
int value4 = (int) status3;示例4: Main
//引入命名空间
using System;
public enum ArrivalStatus { Unknown=-3, Late=-1, OnTime=0, Early=1 };
public class Example
{
public static void Main()
{
int[] values = { -3, -1, 0, 1, 5, Int32.MaxValue };
foreach (var value in values)
{
ArrivalStatus status;
if (Enum.IsDefined(typeof(ArrivalStatus), value))
status = (ArrivalStatus) value;
else
status = ArrivalStatus.Unknown;
Console.WriteLine("Converted {0:N0} to {1}", value, status);
}
}
}输出：
Converted -3 to Unknown Converted -1 to Late Converted 0 to OnTime Converted 1 to Early Converted 5 to Unknown Converted 2,147,483,647 to Unknown
示例5:
ArrivalStatus status = ArrivalStatus.Early;
var number = Convert.ChangeType(status, Enum.GetUnderlyingType(typeof(ArrivalStatus)));
Console.WriteLine("Converted {0} to {1}", status, number);输出：
Converted Early to 1
示例6: if
string number = "-1";
string name = "Early";
try {
ArrivalStatus status1 = (ArrivalStatus) Enum.Parse(typeof(ArrivalStatus), number);
if (!(Enum.IsDefined(typeof(ArrivalStatus), status1)))
status1 = ArrivalStatus.Unknown;
Console.WriteLine("Converted '{0}' to {1}", number, status1);
}
catch (FormatException) {
Console.WriteLine("Unable to convert '{0}' to an ArrivalStatus value.",
number);
}
ArrivalStatus status2;
if (Enum.TryParse<ArrivalStatus>(name, out status2)) {
if (!(Enum.IsDefined(typeof(ArrivalStatus), status2)))
status2 = ArrivalStatus.Unknown;
Console.WriteLine("Converted '{0}' to {1}", name, status2);
}
else {
Console.WriteLine("Unable to convert '{0}' to an ArrivalStatus value.",
number);
}输出：
Converted '-1' to Late Converted 'Early' to Early
示例7:
string[] formats= { "G", "F", "D", "X"};
ArrivalStatus status = ArrivalStatus.Late;
foreach (var fmt in formats)
Console.WriteLine(status.ToString(fmt));输出：
Late Late -1 FFFFFFFF
示例8: typeof
string[] names = Enum.GetNames(typeof(ArrivalStatus));
Console.WriteLine("Members of {0}:", typeof(ArrivalStatus).Name);
Array.Sort(names);
foreach (var name in names) {
ArrivalStatus status = (ArrivalStatus) Enum.Parse(typeof(ArrivalStatus), name);
Console.WriteLine(" {0} ({0:D})", status);
}输出：
Members of ArrivalStatus: Early (1) Late (-1) OnTime (0) Unknown (-3)
示例9: typeof
var values = Enum.GetValues(typeof(ArrivalStatus));
Console.WriteLine("Members of {0}:", typeof(ArrivalStatus).Name);
foreach (ArrivalStatus status in values) {
Console.WriteLine(" {0} ({0:D})", status);
}输出：
Members of ArrivalStatus: OnTime (0) Early (1) Unknown (-3) Late (-1)
示例10:
Pets familyPets = Pets.Dog | Pets.Cat;
if (familyPets.HasFlag(Pets.Dog))
Console.WriteLine("The family has a dog.");输出：
The family has a dog.
示例11:
Pets familyPets = Pets.Dog | Pets.Cat;
if ((familyPets & Pets.Dog) == Pets.Dog)
Console.WriteLine("The family has a dog.");输出：
The family has a dog.
示例12:
Pets familyPets = Pets.Dog | Pets.Cat;
if (familyPets == Pets.None)
Console.WriteLine("The family has no pets.");
else
Console.WriteLine("The family has pets.");输出：
The family has pets.
示例13: Passing
//引入命名空间
using System;
// Define an enumeration to represent student grades.
public enum Grades { F = 0, D = 1, C = 2, B = 3, A = 4 };
// Define an extension method for the Grades enumeration.
public static class Extensions
{
public static Grades minPassing = Grades.D;
public static bool Passing(this Grades grade)
{
return grade >= minPassing;
}
}
class Example
{
static void Main()
{
Grades g1 = Grades.D;
Grades g2 = Grades.F;
Console.WriteLine("{0} {1} a passing grade.", g1, g1.Passing() ? "is" : "is not");
Console.WriteLine("{0} {1} a passing grade.", g2, g2.Passing() ? "is" : "is not");
Extensions.minPassing = Grades.C;
Console.WriteLine("\nRaising the bar!\n");
Console.WriteLine("{0} {1} a passing grade.", g1, g1.Passing() ? "is" : "is not");
Console.WriteLine("{0} {1} a passing grade.", g2, g2.Passing() ? "is" : "is not");
}
}输出：
D is a passing grade. F is not a passing grade. Raising the bar! D is not a passing grade. F is not a passing grade.