C#等价于C++ map <string,double>

Question

我想为不同的帐户保留一些总计.在C++中我会像这样使用STL:

map<string,double> accounts;

// Add some amounts to some accounts.
accounts["Fred"] += 4.56;
accounts["George"] += 1.00;
accounts["Fred"] += 1.00;

cout << "Fred owes me $" << accounts['Fred'] << endl;

现在,我将如何在C#中做同样的事情？

Answer 1

大致:-

var accounts = new Dictionary<string, double>();

// Initialise to zero...

accounts["Fred"] = 0;
accounts["George"] = 0;
accounts["Fred"] = 0;

// Add cash.
accounts["Fred"] += 4.56;
accounts["George"] += 1.00;
accounts["Fred"] += 1.00;

Console.WriteLine("Fred owes me ${0}", accounts["Fred"]);

Answer 2

Dictionary<string, double> accounts;

Answer 3

尽管System.Collections.Generic.Dictionary匹配标记"hashmap"并且在您的示例中运行良好,但它并不完全等同于C++的std :: map - std :: map是一个有序集合.

如果排序很重要,您应该使用SortedDictionary.

Answer 4

你想要Dictionary类。