我有一门课叫问题（复数）。在这个类中有一个名为Question（单数）的枚举，看起来像这样。
public enum Question
{
Role = 2,
ProjectFunding = 3,
TotalEmployee = 4,
NumberOfServers = 5,
TopBusinessConcern = 6
}
在Questions类中，我有一个get（intfoo）函数，它为该foo返回Questions对象。有没有一种简单的方法可以从枚举中获取整数值，这样我就可以执行类似于Questions.get（Questions.Role）的操作？
当前回答
public enum ViewType
{
List = 1,
Table = 2,
};
// You can use the Enum type as a parameter, so any enumeration from any enumerator
// cshtml
// using proyects.Helpers
// @if (Model.ViewType== (int)<variable>.List )
其他回答
为了确保枚举值存在，然后解析它，还可以执行以下操作。
// Fake Day of Week
string strDOWFake = "SuperDay";
// Real Day of Week
string strDOWReal = "Friday";
// Will hold which ever is the real DOW.
DayOfWeek enmDOW;
// See if fake DOW is defined in the DayOfWeek enumeration.
if (Enum.IsDefined(typeof(DayOfWeek), strDOWFake))
{
// This will never be reached since "SuperDay"
// doesn't exist in the DayOfWeek enumeration.
enmDOW = (DayOfWeek)Enum.Parse(typeof(DayOfWeek), strDOWFake);
}
// See if real DOW is defined in the DayOfWeek enumeration.
else if (Enum.IsDefined(typeof(DayOfWeek), strDOWReal))
{
// This will parse the string into it's corresponding DOW enum object.
enmDOW = (DayOfWeek)Enum.Parse(typeof(DayOfWeek), strDOWReal);
}
// Can now use the DOW enum object.
Console.Write("Today is " + enmDOW.ToString() + ".");
int number = Question.Role.GetHashCode();
number的值应为2。
我最喜欢的int或更小enums黑客：
GetHashCode();
对于枚举
public enum Test
{
Min = Int32.MinValue,
One = 1,
Max = Int32.MaxValue,
}
这
var values = Enum.GetValues(typeof(Test));
foreach (var val in values)
{
Console.WriteLine(val.GetHashCode());
Console.WriteLine(((int)val));
Console.WriteLine(val);
}
输出
one
1
1
max
2147483647
2147483647
min
-2147483648
-2147483648
免责声明：
它不适用于基于long的枚举。
我提出了包含当前语言特性的扩展方法。通过使用dynamic，我不需要将其作为泛型方法并指定使调用更简单和一致的类型：
public static class EnumEx
{
public static dynamic Value(this Enum e)
{
switch (e.GetTypeCode())
{
case TypeCode.Byte:
{
return (byte) (IConvertible) e;
}
case TypeCode.Int16:
{
return (short) (IConvertible) e;
}
case TypeCode.Int32:
{
return (int) (IConvertible) e;
}
case TypeCode.Int64:
{
return (long) (IConvertible) e;
}
case TypeCode.UInt16:
{
return (ushort) (IConvertible) e;
}
case TypeCode.UInt32:
{
return (uint) (IConvertible) e;
}
case TypeCode.UInt64:
{
return (ulong) (IConvertible) e;
}
case TypeCode.SByte:
{
return (sbyte) (IConvertible) e;
}
}
return 0;
}
例子：
public enum EmpNo
{
Raj = 1,
Rahul,
Priyanka
}
在后面的代码中获取枚举值：
int setempNo = (int)EmpNo.Raj; // This will give setempNo = 1
or
int setempNo = (int)EmpNo.Rahul; // This will give setempNo = 2
枚举将递增1，您可以设置起始值。如果不设置起始值，初始值将指定为0。
