转换查找< TKEY的，TElement>到其他数据结构C＃ [英] Converting Lookup<TKey, TElement> into other data structures c#

问题描述

我有一个

Lookup<TKey, TElement>

其中TElement指一串字。我想
查找转换为：

where the TElement refers to a string of words. I want to convert Lookup into:

Dictionary<int ,string []> or List<List<string>> ?

我读过关于使用

I have read some articles about using the

Lookup<TKey, TElement>

但它是不够的，我明白。提前致谢。

but it wasn't enough for me to understand. Thanks in advance.

推荐答案

您可以做到这一点使用这些方法：

You can do that using these methods:

• Enumerable.ToDictionary< TSource，TKEY的>


• 的 Enumerable.ToList< TSource>

• Enumerable.ToDictionary<TSource, TKey>
• Enumerable.ToList<TSource>

让说你有一个查找< INT，串> 名为 mylookup 包含几个单词的字符串，那么你可以把 IGrouping 值到的String [] 和包装整个事情变成词典：

Lets say you have a Lookup<int, string> called mylookup with the strings containing several words, then you can put the IGrouping values into a string[] and pack the whole thing into a dictionary:

var mydict = mylookup.ToDictionary(x => x.Key, x => x.ToArray());

更新

看了你的评论，我知道你其实想与你的查找（见OPS的前面的问题）。你不必把它转换成一个字典或列表。只需直接使用查找：

Having read your comment, I know what you actually want to do with your lookup (see the ops previous question). You dont have to convert it into a dictionary or list. Just use the lookup directly:

var wordlist = " aa bb cc ccc ddd ddd aa ";
var lookup = wordlist.Trim().Split().Distinct().ToLookup(word => word.Length);

foreach (var grouping in lookup.OrderBy(x => x.Key))
{
    // grouping.Key contains the word length of the group
    Console.WriteLine("Words with length {0}:", grouping.Key);

    foreach (var word in grouping.OrderBy(x => x))
    {
        // do something with every word in the group
        Console.WriteLine(word);
    }
}

此外，如果顺序很重要，可以随时排序通过排序依据或 OrderByDescending 扩展方法的的IEnumerable 取值

编辑：

看上面编辑的代码示例：如果您要订购的钥匙，只需要使用排序依据方法。

look at the edited code sample above: If you want to order the keys, just use the OrderBy method. The same way you could order the words alphabetically by using grouping.OrderBy(x => x).

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