c# - 使用反射获取通用 Dictionary <,> 的键值

Question

如何获取通用 IDictionary<,> 的键值使用反射。

这就是我想做的事情。

public static string Format<T>(T item)
{
    if (item.GetType().GetInterfaces().Any(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(IDictionary<,>)))
    {
        // I know it's a IDictionary so figure out what the types are
        Type keyType = item.GetType().GetGenericArguments()[0];
        Type valueType = item.GetType().GetGenericArguments()[1];

        //Now cast it to the correct IDictionary.  How do I properly inject the type here?
        var keyList = ((IDictionary<keyType, valueType>)item).Select(x => x.Key.ToString()).ToArray<string>();

    }
}

编辑:澄清我想使用反射

Answer 1

我认为你把事情复杂化了。当我查看您的代码时，您正在尝试执行以下操作:

myDictionary.Keys.Select(k => k.ToString()).ToArray();

所以，

public string Format<T>(T value) {
    if (##item is dictionary) {
        var items = name.GetType().GetProperty("Keys", BindingFlags.Instance | BindingFlags.Public).GetValue(item) as IEnumerable;
        if (items == null) throw new ArgumentException("Dictionary with no keys?");
        string[] data = items.OfType<object>().Select(o => o.ToString()).ToArray();
    }
}