如何在字典中存储一个键和多个值 [英] How to store one key and multiple values in a dictionary

问题描述

嗨朋友们，



我有一个场景，我需要一个带字符串键的字典和相关的两个字符串值，如下所示。

关键是粗体。

我使用Visual Studio 2008，框架3.5。和c＃。





字典<字符串，字符串，字符串>



我尝试了什么：



我尝试了以下方法：



1. 字典<字符串，对象> ..........对象封装了我的两个必填字段。

但是在获取值时我将不得不承担额外的投射费用。



2.Someone建议我使用< br $>


字典<字符串，列表><字符串>>



但我猜这个列表本身就是一个对象的集合，也会涉及到投射开销。





所以伙计们请帮帮我....

c＃中是否有任何数据结构可以存储多个值作为值类型？





谢谢

Varun

解决方案

如果你懒得创建字典 string 和 Tuple< string，string> 。

 IDictionary< string，Tuple< string，string>> myDictionary =  new  Dictionary< string，Tuple< string，string>>（）; 

如果你'不要懒惰，创建一个包含两个字符串的类（我将称之为 Foo 和 Bar ）。

  public   class  MyOwnType {
  public   string  Foo { get ;  set ; } 
  public   string 栏{ get ;  set ; } 
  public  MyOwnType（ string  foo， string  bar）{
 Foo = foo; 
 Bar = bar; 
} 
} 

 IDictionary< string，MyOwnType> myDictionary =  new 字典<字符串，MyOwnType>（）; 

希望这有帮助，

Fredrik

根据具体情况，您可以使用至少几种方法，例如：

1. 字典< TKey，列表< TValue>>

2. 字典< TKey，List< ComplexObject>>

3. 字典< TKey，Tuple< TValue1，TValue2>>

等



基于 MSDN文档 [ ^ ]，你可以创建一个字典对象来创建文件扩展名和应用程序之间的关系，它可以打开扩展。例如：

 Dictionary< string，List< string>> openWith = 
  new  Dictionary< string，List< string>>（）; 
 
  //  在字典中添加一些元素。没有 
  //  重复键，但有些值是重复的。 
 openWith.Add（  notepad.exe， new 列表< string>（）{  .txt，< span class =code-string> 。vbs，  CSV}）。 
 openWith.Add（  winword.exe， new 列表< string>（）{  .txt， 。vbs，  .csv， 。htm，  .html， 。doc， 。docx，  .dot，  .dotx， 。docm， 。dotm}）; 
  //  依此类推......  

Hi Friends,

I have a scenario where i need to have a dictionary with a string key and associated two string values like the below.
The key is in bold.
I am using Visual studio 2008,framework 3.5. and c#.


dictionary<string,string,string>

What I have tried:

I tried the following approach:

1. dictionary<string,object>..........where the object encapsulated my two required fields.
But i would have to incur extra casting overhead while fetching the values.

2.Someone suggested me to use

dictionary<string,list><string>>

but i guess the list is itself a collection of objects and will also involve the casting overhead.


So guys please help me out....
is there any datastructure in c# that can store multiple values as valuetypes?


Thanks
Varun

解决方案

If you're lazy create a Dictionary of string and Tuple<string,string>.

IDictionary<string, Tuple<string, string>> myDictionary = new Dictionary<string, Tuple<string, string>>();

If you're not lazy, create a class that holds your two strings (I'm going to call them Foo and Bar).

public class MyOwnType {
   public string Foo { get; set; }
   public string Bar { get; set; }
   public MyOwnType(string foo, string bar) {
       Foo = foo;
       Bar = bar;
   }
}

IDictionary<string, MyOwnType> myDictionary = new Dictionary<string, MyOwnType>();

Hope this helps,
Fredrik

Depending on situation, you can use at least several approaches, such as:
1. Dictionary<TKey, List<TValue>>
2. Dictionary<TKey, List<ComplexObject>>
3. Dictionary<TKey, Tuple<TValue1, TValue2>>
etc.

Based on MSDN documention[^], you can create a dictionary object to create relationship between file extensions and application which is able to open that extensions. For example:

Dictionary<string, List<string>> openWith = 
            new Dictionary<string, List<string>>();

        // Add some elements to the dictionary. There are no 
        // duplicate keys, but some of the values are duplicates.
        openWith.Add("notepad.exe", new List<string>(){".txt", ".vbs", ".csv"});
        openWith.Add("winword.exe", new List<string>(){".txt", ".vbs", ".csv", ".htm", ".html", ".doc", ".docx", ".dot", ".dotx", ".docm", ".dotm"});
        //and so on...

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