c# - 遍历类的常量成员

Question

我有一个包含常量字符串的类。我想将所有这些字符串放入一个下拉集合中。做这个的最好方式是什么？这就是我现在所拥有的，从理论上讲，我认为这是最好的方法。

public class TestClass
{
    private const string _testA = "Test A";
    private const string _testB = "Test B";

    public string TestA
    {
        get { return _testA; }
    }

    public string TestB
    {
        get { return _testB; }
    }
}

public DropDownItemCollection TestCollection
{
    DropDownItemCollection collection = new DropDownItemCollection();
    TestClass class = new TestClass();

    foreach (string testString in class)
    {
        DropDownItem item = new DropDownItem();
        item.Description = testString;
        item.Value = testString;
        collection.Add(item);
    }

    return collection;
}

问题是这会在 foreach 上返回一个错误:“...不包含 GetEnumerator 的公共(public)定义。”我曾尝试创建 GetEnumerator，但没有成功，而且我过去没有使用过 GetEnumerator。

非常感谢任何帮助!

Answer 1

有点晚了，但这不是更好的解决方案吗？

http://weblogs.asp.net/whaggard/archive/2003/02/20/2708.aspx

private FieldInfo[] GetConstants(System.Type type)
{
    ArrayList constants = new ArrayList();

    FieldInfo[] fieldInfos = type.GetFields(
        // Gets all public and static fields

        BindingFlags.Public | BindingFlags.Static | 
        // This tells it to get the fields from all base types as well

        BindingFlags.FlattenHierarchy);

    // Go through the list and only pick out the constants
    foreach(FieldInfo fi in fieldInfos)
        // IsLiteral determines if its value is written at 
        //   compile time and not changeable
        // IsInitOnly determine if the field can be set 
        //   in the body of the constructor
        // for C# a field which is readonly keyword would have both true 
        //   but a const field would have only IsLiteral equal to true
        if(fi.IsLiteral && !fi.IsInitOnly)
            constants.Add(fi);           

    // Return an array of FieldInfos
    return (FieldInfo[])constants.ToArray(typeof(FieldInfo));
}

如果你需要名字你可以做

fi.GetValue(null)

在循环中。