Given a constructor
public MyObject(int id){
ID = id;
}
And two enums:
public enum MyEnum1{
Something = 1,
Anotherthing = 2
}
public enum MyEnum2{
Dodo = 1,
Moustache= 2
}
Is it possible to pass in a generic enum as a parameter of the constructor? I'm looking for a solution along the lines of:
public MyObject(enum someEnum){
ID = (int)someEnum;
}
So you can do:
var newObject = new MyObject(MyEnum1.Something);
var anotherObject = new MyObject(MyEnum2.Dodo);
Another option would be:
public MyObject(Enum someEnum){
ID = Convert.ToInt32(someEnum);
}
This way you can use it like you requested without having to cast to int
each time you call your contstructors:
var newObject = new MyObject(MyEnum1.Something);
var anotherObject = new MyObject(MyEnum2.Dodo);
Why do you want to pass the enums, while you could pass integers ?
var newObject = new MyObject((int)MyEnum1.Something);
var anotherObject = new MyObject((int)MyEnum2.Dodo);
and use your first constructor :
public MyObject(int id){
ID = id;
}
Just use a generic constructor:
class MyObject<T> {
public MyObject(T someEnum) where T : struct, IConvertible
{
if (!typeof(T).IsEnum)
throw new ArgumentException("Not an enum");
ID = Convert.ToInt32(someEnum);
}
}
Now you can easily call it like this:
var m = new MyObject<MyEnum>(MyEnum1.Something);
But easier would be to pass the enum as integer to the constructor as mentioned in other answers.
Well, if you really need to make this call generic for a wide variety of types, then IMHO you should use:
Enum
; Int32
); Now cast your object.
public static Int32 GetAnInt<T>(T arg) where T : struct { if ((typeof(T).IsEnum)) { var underlyingType = typeof(T).GetEnumUnderlyingType(); if (underlyingType == typeof(Int32) || underlyingType == typeof(Int16)) //etc. { try { dynamic value = arg; var result = (Int32)value; // can throw InvalidCast! return result; } catch { throw; } } else { throw new InvalidCastException("Underlying type is certainly not castable to Int32!"); } } else { throw new InvalidCastException("Not an Enum!"); } }
That way you achieve the beautiful syntax of: var j = GetAnInt(MyEnum.FirstValue);
Are you using properties enum or parameters.
public enum Enum1{}
public Enum1 enum1 { get;set; }
public MyObject()
{
ID = (int)enum1;
}
Just try it. I hope it is useful.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.