C＃的int枚举转换 [英] C# int to enum conversion

问题描述

可能重复：结果
的演员int在C＃枚举

如果我有下面的代码：

enum foo : int
{
    option1 = 1,
    option2,
    ...
}

private foo convertIntToFoo(int value)
{
    // Convert int to respective Foo value or throw exception
}

会是什么样的转换代码是什么样子？

What would the conversion code look like?

推荐答案

这很好只是你的INT转换为富：

It's fine just to cast your int to Foo:

int i = 1;
Foo f = (Foo)i;

如果您尝试投放的是没有定义它仍然可以工作的值。可能来自这个唯一的坏处是你如何使用的值以后。

If you try to cast a value that's not defined it will still work. The only harm that may come from this is in how you use the value later on.

如果你真的想确保你的价值在枚举定义，你可以使用Enum.IsDefined：

If you really want to make sure your value is defined in the enum, you can use Enum.IsDefined:

int i = 1;
if (Enum.IsDefined(typeof(Foo), i))
{
    Foo f = (Foo)i;
}
else
{
   // Throw exception, etc.
}

然而，使用成本IsDefined不仅仅是铸造了。使用哪个取决于你的实行。你可能会考虑限制用户的输入，或者当您使用枚举处理默认情况下

However, using IsDefined costs more than just casting. Which you use depends on your implemenation. You might consider restricting user input, or handling a default case when you use the enum.

另外请注意，您不必指定您的枚举从int继承;这是默认的行为。

Also note that you don't have to specify that your enum inherits from int; this is the default behavior.

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