如何NameValueCollection中转换为哈希表

问题描述

我有一个的NameValueCollection 对象，我需要将其转换为一个的Hashtable 对象，preferrably在一行code。我怎样才能做到这一点？

I have a NameValueCollection object and I need to convert it to a Hashtable object, preferrably in one line of code. How can I achieve this?

推荐答案

您应该考虑使用一个通用的 词典 ，而不是因为它的强类型，而<$c$c>Hashtable不是。试试这个：

You should consider using a generic Dictionary instead since it's strongly-typed, whereas a Hashtable isn't. Try this:

NameValueCollection col = new NameValueCollection();
col.Add("red", "rouge");
col.Add("green", "verde");
col.Add("blue", "azul");

var dict = col.AllKeys
              .ToDictionary(k => k, k => col[k]);

编辑：基于您的评论，得到一个哈希表，你仍然可以使用上面的方法，并添加更多的线。你总是可以使这项工作在同一行，但2线更具可读性。

Based on your comment, to get a HashTable you could still use the above approach and add one more line. You could always make this work in one line but 2 lines are more readable.

Hashtable hashTable = new Hashtable(dict);

另外，使用循环将是pre-.NET 3.5做法：

Alternately, the pre-.NET 3.5 approach using a loop would be:

Hashtable hashTable = new Hashtable();
foreach (string key in col)
{
    hashTable.Add(key, col[key]);
}

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