我怎么投通用枚举为int？ [英] How do I cast generic enum to int?

问题描述

我有一个看起来像这样的小方法：

I have a small method that looks like this:

    public void SetOptions<T>() where T : Enum
    {
        int i = 0;
        foreach (T obj in Enum.GetValues(typeof(T)))
        {
            if (i == 0)
                DefaultOption = new ListItem(obj.Description(), obj.ToString());
            i++;

            DropDownList.Items.Add(new ListItem(obj.Description(), obj.ToString()));
        }
    }

基本上，我填充由枚举的下拉列表。 说明（）实际上是枚举一个扩展方法，让 T 绝对是一个枚举。

Basically, I populate a dropdown list from an enum. Description() is actually an extension method for enums, so T is definitely an enum.

不过，我想投 OBJ 就像你任何枚举其指数这样的（INT）OBJ ，但我得到一个错误说我不能转换T可诠释。有没有办法做到这一点？

However, I want to cast obj just as you would any enum to its index like this (int)obj, but I get an error saying I can't convert T to int. Is there any way to do this?

推荐答案

试试这个，

public void SetOptions<T>()
{
    Type genericType = typeof(T);
    if (genericType.IsEnum)
    {
        foreach (T obj in Enum.GetValues(genericType))
        {
            Enum test = Enum.Parse(typeof(T), obj.ToString()) as Enum;
            int x = Convert.ToInt32(test); // x is the integer value of enum
                        ..........
                        ..........
        }
    }
}

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