C# enums as function parameters?

问题

Can you pass a standard c# enum as a parameter?

For example:

enum e1
{
    //...
}

enum e2
{
    //...
}

public void test()
{
    myFunc( e1 );
    myFunc( e2 );
}

public void myFunc( Enum e )
{
    // Iterate through all the values in e
}

By doing this I hope to retrieve all the names within any given enum. What would the Iteration code look like?

回答1:

This!

        public void Foo(Enum e)
        {
            var names = Enum.GetNames(e.GetType());

            foreach (var name in names)
            {
                // do something!
            }
        }

EDIT: My bad, you did say iterate.

Note: I know I could just do the GetNames() call in my foreach statement, but I prefer to assign that type of thing to a method call first, as it's handy for debugging.

回答2:

Use the Enum.GetNames( typeof(e) ) method, this will return an array of strings with the names.

You can also use Enum.GetValues to obtain the counterpart values.

Edit -Whoops - if you are passing the parameter as Enum, you will need to use e.GetType() instead of typeof() which you would use if you had passed the parameter in as the actual Enum type name.

回答3:

You mean something like Enum.GetNames?

回答4:

Enum.GetValues Enum.GetNames

so something like...

foreach(e1 value in Enum.GetValues(typeof(e1)))

回答5:

You will have trouble if you try passing an enum directly to myFunc, as in the following example:

enum e1 {something, other};
myFunc(e1);  // Syntax error: "e1 is a type, but is being used like a variable"

回答6:

Like this:

    public void myFunc(Enum e)
    {
        foreach (var name in Enum.GetNames(typeof(e)))
        {
            Console.WriteLine(name);
        }
    }

回答7:

correct is:

public void myFunc(Enum e)
{
    foreach (var name in Enum.GetNames(e.GetTye()))
    {
        Console.WriteLine(name);
    }
}

来源：https://stackoverflow.com/questions/492115/c-sharp-enums-as-function-parameters

标签

enums

loops

function-parameter