C# で int を enum にキャストするにはどうすればいいですか? 質問する

int から:

YourEnum foo = (YourEnum)yourInt;

文字列から:

YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);

// The foo.ToString().Contains(",") check is necessary for 
// enumerations marked with a [Flags] attribute.
if (!Enum.IsDefined(typeof(YourEnum), foo) && !foo.ToString().Contains(","))
{
    throw new InvalidOperationException(
        $"{yourString} is not an underlying value of the YourEnum enumeration."
    );
}

動的（コンパイル時に型が不明）:

Type enumType = ...;

// NB: Enums can specify a base type other than 'int'
int numericValue = ...;

object boxedEnumValue = Enum.ToObject(enumType, numericValue);