在 .NET 中使用“Type"和“Enum"作为参数 [英] Using 'Type' and 'Enum' as parameters in .NET

问题描述

我正在尝试编写一种将字符串参数解析为枚举的方法.枚举的类型也由参数决定.这是我的开始:

I'm trying to writing a method that parses a string parameter into an enum. The enum's type is also determined by a parameter. This is what I've started with:

public static type GetValueOrEmpty(string text, Type type)
{
    if (!String.IsNullOrEmpty(text))
    {
        return (type)Enum.Parse(typeof(type)value);
    }
    else
    {
        // Do something else
    }
}

显然，由于多种原因，这不起作用.有没有办法做到这一点?

Obviously this won't work for a number of reasons. Is there a way this can be done?

推荐答案

如果您在编译时知道类型，则可以改为使用泛型:

You can make it generic instead, if you know the type at compile-time:

public static T GetValueOrEmpty<T>(string text)
{
    if (!String.IsNullOrEmpty(text))
    {
        return (T) Enum.Parse(typeof(T), text);
    }
    else
    {
        // Do something else
    }
}

如果您在编译时不知道类型，那么让方法返回该类型对您来说没有多大用处.你当然可以让它返回object:

If you don't know the type at compile-time, then having the method return that type won't be much use to you. You can make it return object of course:

public static object GetValueOrEmpty(string text, Type type)
{
    if (!String.IsNullOrEmpty(text))
    {
        return Enum.Parse(type, text);
    }
    else
    {
        // Do something else
    }
}

如果这些都对您没有用，请提供有关您要实现的目标的更多信息.

If neither of these are useful to you, please give more information about what you're trying to achieve.

这篇关于在 .NET 中使用“Type"和“Enum"作为参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！