How to loop each items in enum ?

[cyshao]

Hi ,my friends:

I have a enum type ,EMyEnum , defigned as [Flag()].
I just want to do something like this:

foreach( EMyEnum crrEnum in EMyEnum )
{
//do something
}

////////////////////////////////////////////////////
But I can't find any way to do that, and only used a very foolish method
like this

string[] names = Enum.GetNames(t ypeof(EMyEnum ));
foreach (string crrEnumName in names )
{
EMyEnum crrEnum = (EMyEnum )Enum.Parse( typeof(EMyEnum ) ,
crrEnumName );
//do something
}

///////////////////////////////////////////////////
Are there any good ideas to do that?
Or Microsoft forget to design a method like this:
vector< EMyEnum > Enum.GetTypes( typeof(EMyEnum ) )

Thanks

CYShao ^_^

[Peter Rilling]

Re: How to loop each items in enum ?

Try the Enum.GetNames() method.

"cyshao" <adadad@263.net > wrote in message
news:e6LkZ0QKFH A.1476@TK2MSFTN GP09.phx.gbl...[color=blue]
> Hi ,my friends:
>
> I have a enum type ,EMyEnum , defigned as [Flag()].
> I just want to do something like this:
>
> foreach( EMyEnum crrEnum in EMyEnum )
> {
> //do something
> }
>
> ////////////////////////////////////////////////////
> But I can't find any way to do that, and only used a very foolish method
> like this
>
> string[] names = Enum.GetNames(t ypeof(EMyEnum ));
> foreach (string crrEnumName in names )
> {
> EMyEnum crrEnum = (EMyEnum )Enum.Parse( typeof(EMyEnum ) ,
> crrEnumName );
> //do something
> }
>
> ///////////////////////////////////////////////////
> Are there any good ideas to do that?
> Or Microsoft forget to design a method like this:
> vector< EMyEnum > Enum.GetTypes( typeof(EMyEnum ) )
>
> Thanks
>
> CYShao ^_^
>
>
>
>
>
>
>[/color]

[Alexander Shirshov]

Re: How to loop each items in enum ?

Well, if your method is foolish then I've been posing as a fool hundreds of
times! :-)

I routinely use Enum.GetNames to fill a combobox for instance and then
Enum.GetValues to get the selected value. Did you look at GetValues method?
Your sample could be rewritten as:

foreach (EMyEnum val in Enum.GetValues( typeof(EMyEnum) ))
{
Console.WriteLi ne(val);
}


And then there's Reflection of course. Although an overkill in most
enum-related tasks, it allows some neat tricks like working with custom
attributes:

class FriendlyNameAtt ribute : Attribute
{
public readonly string Value;
public FriendlyNameAtt ribute(string value)
{
Value = value;
}
}

enum MyEnum {
[FriendlyName("V alue of One")]
One,
[FriendlyName("V alue of Two")]
Two,
Three
};

class MainClass
{
public static void Main(String[] args)
{
foreach (FieldInfo fi in typeof(MyEnum). GetFields())
{
FriendlyNameAtt ribute[] names =
(FriendlyNameAt tribute[])fi.GetCustomAt tributes(typeof (FriendlyNameAt tribute),
true);
if (names.Length > 0)
{
Console.WriteLi ne(names[0].Value);
}
else
{
Console.WriteLi ne(fi.Name);
}
}
}
}


HTH,
Alexander


"cyshao" <adadad@263.net > wrote in message
news:e6LkZ0QKFH A.1476@TK2MSFTN GP09.phx.gbl...[color=blue]
> Hi ,my friends:
>
> I have a enum type ,EMyEnum , defigned as [Flag()].
> I just want to do something like this:
>
> foreach( EMyEnum crrEnum in EMyEnum )
> {
> //do something
> }
>
> ////////////////////////////////////////////////////
> But I can't find any way to do that, and only used a very foolish method
> like this
>
> string[] names = Enum.GetNames(t ypeof(EMyEnum ));
> foreach (string crrEnumName in names )
> {
> EMyEnum crrEnum = (EMyEnum )Enum.Parse( typeof(EMyEnum ) ,
> crrEnumName );
> //do something
> }
>
> ///////////////////////////////////////////////////
> Are there any good ideas to do that?
> Or Microsoft forget to design a method like this:
> vector< EMyEnum > Enum.GetTypes( typeof(EMyEnum ) )
>
> Thanks
>
> CYShao ^_^
>
>
>
>
>
>
>[/color]

[Jon Skeet [C# MVP]]

Re: How to loop each items in enum ?

Alexander Shirshov <alexander@omni talented.com> wrote:[color=blue]
> Well, if your method is foolish then I've been posing as a fool hundreds of
> times! :-)[/color]

I don't think so...
[color=blue]
> I routinely use Enum.GetNames to fill a combobox for instance and then
> Enum.GetValues to get the selected value. Did you look at GetValues method?
>
> Your sample could be rewritten as:
>
> foreach (EMyEnum val in Enum.GetValues( typeof(EMyEnum) ))
> {
> Console.WriteLi ne(val);
> }[/color]

And that's the difference - I'd expect that calling GetValues is much
cheaper than calling GetNames and then calling Enum.Parse on each name.

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too