如何通过枚举和值名称的名称来获得未知的枚举值? [英] how to get value of an unknown enum by name of enum and name of value?

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问题描述

有关问这个问题抱歉,但我没有找到此任务的正确解决方案:



我有一个枚举,它被命名为myEnum( myEnum不被功能)
知我需要得到myEnum值



实例的int值:结果
一程序员命名为它的枚举myEnum:

 公共枚举myEnum 
{
富= 1,
栏= 2,
}

我的功能应做到以下几点:$ b​​ $



<$ p $:乙获得的myEnum富由字符串值



功能应该打开p> 公众诠释GetValueOf(字符串EnumName,串EnumConst)
{

}

所以,当程序员通过它打开:

  int类型的= GetValueOf(myEnum ,富); 



这应该返回1



和时程序员b有一个枚举名为MySpace的,希望与值5回栏

  int类型的= GetValueOf(MySpace的,酒吧)

应该返回5



我怎样才能做到这一点?


解决方案

您可以使用的 Enum.Parse 要做到这一点,但你需要的枚举类型的完全限定类型名称,例如:SomeNamespace。 myEnum

 公共静态INT GetValueOf(字符串enumName,串enumConst)
{
型enumType = Type.GetType(enumName);
如果(enumType == NULL)
{
抛出新的ArgumentException(指定枚举类型找不到,enumName);
}

对象值= Enum.Parse(enumType,enumConst);
返回Convert.ToInt32(值);
}



另外请注意,这里使用 Convert.ToInt32 ,而不是演员。这将处理枚举值与基础类型不属于的Int32 。这仍然会抛出发生OverflowException ,但是,如果你的枚举有一个的Int32 的范围之外的潜在价值(即:如果它是一个ULONG作为值是> int.MaxValue


sorry for asking this question but i didn't found the right solution for this task:

I've got a Enum, which is named "myEnum" (MyEnum isn't known by the function) I Need to get the int value of a Value of myEnum

Example:
A Programmer named its enum "myEnum":

 public enum myEnum
 {
     foo = 1,
     bar = 2,
 }

my function should do the following: Get the Value of "foo" of "myEnum" by string

function should opened by:

 public int GetValueOf(string EnumName, string EnumConst)
 {

 }

so when Programmer A opens it by :

 int a = GetValueOf("myEnum","foo");

it should return 1

and when Programmer B has an Enum named "mySpace", wants to return "bar" with Value 5

int a = GetValueOf("mySpace","bar")

should return 5

how can i do this?

解决方案

You can use Enum.Parse to do this, but you'd need the fully qualified type name of the Enum type, ie: "SomeNamespace.myEnum":

public static int GetValueOf(string enumName, string enumConst)
{
    Type enumType = Type.GetType(enumName);
    if (enumType == null)
    {
        throw new ArgumentException("Specified enum type could not be found", "enumName");
    }

    object value = Enum.Parse(enumType, enumConst);
    return Convert.ToInt32(value);
}

Also note that this uses Convert.ToInt32 instead of a cast. This will handle enum values with underlying types which are not Int32. This will still throw an OverflowException, however, if your enum has an underlying value outside of the range of an Int32 (ie: if it's a ulong as the value is >int.MaxValue).

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