如何在C#中将int转换为枚举?


当前回答

或者,使用扩展方法而不是单行:

public static T ToEnum<T>(this string enumString)
{
    return (T) Enum.Parse(typeof (T), enumString);
}

用法:

Color colorEnum = "Red".ToEnum<Color>();

OR

string color = "Red";
var colorEnum = color.ToEnum<Color>();

其他回答

从int:

YourEnum foo = (YourEnum)yourInt;

从字符串:

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."
    );
}

从一个数字:

YourEnum foo = (YourEnum)Enum.ToObject(typeof(YourEnum), yourInt);

简单地,可以将int强制转换为enum

 public enum DaysOfWeeks
    {
        Monday = 1,
        Tuesday = 2,
        Wednesday = 3,
        Thursday = 4,
        Friday = 5,
        Saturday = 6,
        Sunday = 7,
    } 

    var day= (DaysOfWeeks)5;
    Console.WriteLine("Day is : {0}", day);
    Console.ReadLine();

我正在使用这段代码将int转换为枚举:

if (typeof(YourEnum).IsEnumDefined(valueToCast)) return (YourEnum)valueToCast;
else { //handle it here, if its not defined }

我觉得这是最好的解决方案。

有时您有一个MyEnum类型的对象。喜欢

var MyEnumType = typeof(MyEnum);

然后:

Enum.ToObject(typeof(MyEnum), 3)

要将字符串转换为ENUM或将int转换为ENOM常量,我们需要使用ENUM.Parse函数。这是一段youtube视频https://www.youtube.com/watch?v=4nhx4VwdRDk这实际上是用字符串演示的,这同样适用于int。

代码如下所示,其中“红色”是字符串,“MyColors”是具有颜色常数的颜色ENUM。

MyColors EnumColors = (MyColors)Enum.Parse(typeof(MyColors), "Red");