C# 用SortedDictionary Class 取代 C++的std::map

工作上的需要, 我寫程式碼必須做配對 key, and Value
但是希望不要限制 type, 可以自由度高一點

C++的話會想到std::map這個方式
但是我們今天程式碼是透過C#撰寫

那就要找另外的方式, 上網找看看吧! 找到如下…

<a href="http://stackoverflow.com/questions/21183414/what-is-c-sharp-equivalent-of-map-in-c" target="_blank" rel="noopener noreferrer">What is C# equivalent of <map> in C++?</a>
The equivalent would be class <strong>SortedDictionary<TKey, TValue></strong> in the <strong>System.Collections.Generic </strong>namespace.
If you don't care about the order the class <strong>Dictionary<TKey, TValue></strong> in the <strong>System.Collections.Generic </strong>namespace would probably be sufficient.

<a href="http://stackoverflow.com/questions/21183414/what-is-c-sharp-equivalent-of-map-in-c" target="_blank" rel="noopener noreferrer">What is C# equivalent of <map> in C++?</a>

The equivalent would be class SortedDictionary<TKey, TValue> in the System.Collections.Generic namespace.

If you don't care about the order the class Dictionary<TKey, TValue> in the System.Collections.Generic namespace would probably be sufficient.

既然有兩個class可以使用, 就選SortedDictionary吧~
MSDN有完整的說明與介紹, 如何使用SortedDictionary來開發~

初始與放進去:

        // Create a new sorted dictionary of strings, with string
        // keys.
        SortedDictionary<string, string> openWith = 
            new SortedDictionary<string, string>();

        // Add some elements to the dictionary. There are no 
        // duplicate keys, but some of the values are duplicates.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

// Create a new sorted dictionary of strings, with string

// keys.

SortedDictionary<string, string> openWith =

new SortedDictionary<string, string>();

// Add some elements to the dictionary. There are no

// duplicate keys, but some of the values are duplicates.

openWith.Add("txt", "notepad.exe");

openWith.Add("bmp", "paint.exe");

openWith.Add("dib", "paint.exe");

openWith.Add("rtf", "wordpad.exe");

修改, 若不存在這個key則會新增進去:

// If a key does not exist, setting the indexer for that key
        // adds a new key/value pair.
        openWith["doc"] = "winword.exe";

// If a key does not exist, setting the indexer for that key

// adds a new key/value pair.

openWith["doc"] = "winword.exe";

可以用這段KeyValuePair來檢驗是否正確的key & value被放進去:

        // When you use foreach to enumerate dictionary elements,
        // the elements are retrieved as KeyValuePair objects.
        Console.WriteLine();
        foreach( KeyValuePair<string, string> kvp in openWith )
        {
            Console.WriteLine("Key = {0}, Value = {1}", 
                kvp.Key, kvp.Value);
        }

// When you use foreach to enumerate dictionary elements,

// the elements are retrieved as KeyValuePair objects.

Console.WriteLine();

foreach( KeyValuePair<string, string> kvp in openWith )

{

Console.WriteLine("Key = {0}, Value = {1}",

kvp.Key, kvp.Value);

}

大概就這樣~

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