C＃强制转换Dictionary< string，AnyType>到字典<字符串，对象> （涉及反思） [英] C# cast Dictionary<string, AnyType> to Dictionary<string, Object> (Involving Reflection)

问题描述

是否可以将 Dictionary< string，Anything> 转换为一致的中间泛型类型？这样我就可以转换< string，string> ，< string，bool> ，< string，int> ，< string，任何> 都属于相同类型的字典吗？

Is it possible to cast a Dictionary<string, Anything> to a consistent intermediate generic type? So I would be able to cast <string, string>, <string, bool>, <string, int>, <string, anything> all to the same type of dictionary?

我正在研究一个使用大量反射的项目，我需要能够处理以下字典类型：

I am working on a project that is using heavy reflection and I need to be able to process DIctionary types as such:

FieldInfo field = this.GetType().GetField(fieldName);
Dictionary<string, Object> dict = (Dictionary<string, Object>)field.GetValue(this);

上面的代码是我目前拥有的，程序在从field.GetValue强制转换时总是失败通用 Dictionary< string，Object> 。

The above code is what I currently have and the program always fails at the cast from field.GetValue to the generic Dictionary<string, Object>.

有没有办法做到这一点？还是我应该找出其他方法来处理这些词典？

Is there a way to do this? Or should I just figure out a different way to process these Dictionaries?

任何帮助将不胜感激。

推荐答案

在 AakashM的答案之后，Cast似乎没有发挥作用。您可以通过使用一些辅助方法来解决它：

Following AakashM's answer, the Cast doesn't seem to play ball. You can get around it by using a little helper method though:

IDictionary dictionary = (IDictionary)field.GetValue(this);
Dictionary<string, object> newDictionary = CastDict(dictionary)
                                           .ToDictionary(entry => (string)entry.Key,
                                                         entry => entry.Value);

private IEnumerable<DictionaryEntry> CastDict(IDictionary dictionary)
{
    foreach (DictionaryEntry entry in dictionary)
    {
        yield return entry;
    }
}

在这种情况下，键入foreach的鸭子很方便。

The duck typing in foreach is handy in this instance.

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