继承清单 <T> ，希望通过字符串ID值而不是索引来检索项目

Question

I have a class called Question. I have another class called Questions which is simply an inheritance of List creating a collection.

How can I make it so I can retrieve a Question object by it's ID property instead of the integer based index like this?:

Question q = Questions["someidhere"];

Basically I'm looking for the same functionality as a SqlDataReader object where you can retrieve a field based on the field name OR the index.

Answer 1

Don't use a List<T> at all; use a Dictionary<K,V>

var dict = new Dictionary<string, Question>();
dict.Add("someidhere", new Question(...));
// ...
var q = dict["someidhere"];

Answer 2

Use Dictionary<TKey, TValue> . This will do what you need it to do.

Answer 3

you can use OrderedDictionary for this purpose. OrderedDictionary represents a collection of key/value pairs that are accessible by the key or index.