无法将对象添加到字典中

Question

我得到了一个带有列表的代码，我试图将其更改为字典。我的问题是在'BankRates.cs'中我无法将对象添加到我的字典中。我收到消息“Converter.CurrencyDic”不包含“添加”的定义...可以解释一下原因吗？？

我有这 4 个 cs 文件：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Converter
{
    class Currency
    {
        //members

        //getters and setters
        public string Code { get; set; }
        public string Name { get; set; }
        public double Rate { get; set; }
        public double Unit { get; set; }
        public string Country { get; set; }

        //constractor
        public Currency(string code, string name, double rate, double unit, string country)
        {
            this.Code = code;
            this.Name = name;
            this.Rate = rate;
            this.Unit = unit;
            this.Country = country;
        }

        //override ToString method for visualization    
        public override string ToString()
        {
            return  (Name + "-" +Code);
        }
    }
}

货币字典：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Converter
{
    class CurrencyDic
    {
        //setter and getter
        public Dictionary<string,Currency> currencyDic { get; set; }
        //constractor
        public CurrencyDic()
        {
            currencyDic = new Dictionary<string,Currency>();
        }
        public CurrencyDic(Dictionary<string,Currency> cur)
        {
            currencyDic = new Dictionary<string,Currency>(cur);
        }
        // implements foreach
        public IEnumerator<Currency> GetEnumerator()
        {
            foreach (Currency cur in currencyDic.Values) { yield return cur;}
        }
    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Converter
{
    interface IBankRates
    {
         void GetRates();
         double Convert(Currency from, Currency to, double amount);
    }
}

最后一个：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.IO;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Linq;
using System.Runtime.Remoting.Messaging;



namespace Converter
{
    class BankRates:IBankRates
    {
        private string Bank_URL = "http://www.boi.org.il/currency.xml";
        CurrencyDic currencyDic = new CurrencyDic();
        public void GetRates()
        {
            XDocument xdoc = new XDocument();
            try
            {
               xdoc = XDocument.Load(Bank_URL);}
               catch (XmlException)
            {
               MessageBox.Show("Failed to load Xml file");
               System.Environment.Exit(1);

            }
                //load the xml
                var allCurencies = from currency in xdoc.Descendants("CURRENCY")        //linq query
                                   select new
                                   {
                                       Name = currency.Descendants("NAME").First().Value,
                                       Unit = currency.Descendants("UNIT").First().Value,
                                       Code = currency.Descendants("CURRENCYCODE").First().Value,
                                       Cuntry = currency.Descendants("COUNTRY").First().Value,
                                       Rate = currency.Descendants("RATE").First().Value
                                   };


                foreach (var currency in allCurencies)                                  //create the currency list
                {
                    currencyDic.Add(new Currency(currency.Code, currency.Name, double.Parse(currency.Rate), double.Parse(currency.Unit), currency.Cuntry));
                   // Console.WriteLine(currency.Code + currency.Cuntry + currency.Name, currency.Rate + currency.Unit);
                }


        }
        //returns the list
        public CurrencyDic getDic()
        {
            return currencyDic;
        }

        //makes the converting calculation
        public double Convert(Currency from,Currency to, double amount)
        {
            double inRate, outRate, excangeRate;
            inRate = from.Rate / from.Unit;
            outRate = to.Rate / to.Unit;
            excangeRate = inRate / outRate;
            return (amount * excangeRate);
        }
    }
}

Answer 1

您的CurrencyDict 类封装Dictionary<string, Currency>，它不继承一个。

您需要在类中使用Dictionary 的Add 方法：

foreach (var currency in allCurencies)
{
    currencyDic.currencyDic.Add(new Currency(currency.Code, currency.Name,
                                double.Parse(currency.Rate), 
                                double.Parse(currency.Unit), currency.Cuntry));
}

也许您应该尝试更改局部变量的名称，这样您就不会感到困惑了。