Question

我正在尝试从URL读取XML文件 URL和文件很好，它们保持货币汇率。

在10次运行代码9时，没有内容回来。

以下是代码：

        XDocument doc = XDocument.Load("http://www.boi.org.il/currency.xml");
        int currID = 0;
        Dictionary<int, Currency> curr; // declares the dictionary  
        curr = new Dictionary<int, Currency>();

        var data = from item in doc.Descendants("CURRENCY") // LINQ the informartion from the xml to data variable
                   select new
                   {
                       name = item.Element("NAME").Value,
                       country = item.Element("COUNTRY").Value,
                       currencyCode = item.Element("CURRENCYCODE").Value,
                       rate = Convert.ToDouble(item.Element("RATE").Value),
                       unit = Convert.ToDouble(item.Element("UNIT").Value),
                       change = Convert.ToDouble(item.Element("CHANGE").Value),
                   };

        foreach (var xn in data) // run in foreach on the data that we read from the xml and put it in a currency variable into the dictionary
        {
            Currency currency = new Currency();

            currency.Name = xn.name;
            currency.Country = xn.country;
            currency.CurrencyCode = xn.currencyCode;
            currency.Rate = Convert.ToDouble(xn.rate);
            currency.Unit = Convert.ToDouble(xn.unit);
            currency.Change = Convert.ToDouble(xn.change);

            curr.Add(currID, currency);
            currID++;
        }

        foreach (KeyValuePair<int, Currency> entry in curr)
        {
            Console.WriteLine(entry.Value.CurrencyCode);
        }

我编辑了代码以查看输出，我什么都没得到。我做错了什么？

提前致谢。

Answer 1

@David Faiz It Works！

    XmlDocument xDoc = new XmlDocument(); 
    xDoc.Load(@"http://www.boi.org.il//currency.xml"); 
    XmlNodeList xmllist = xDoc.GetElementsByTagName("CURRENCIES"); 
    Console.WriteLine(xmllist.Count);

您必须在网址中添加//斜杠。这就是为什么你把'xmllist.Count'当作零。

Answer 2

这是您的代码的快速重构..

XDocument doc = XDocument.Load(@"http://www.boi.org.il/currency.xml");

foreach (XElement elm in doc.Elements) 
{
    Currency currency = new Currency();

    currency.Name = elm.Element("NAME").Value;
    currency.Country = elm.Element("COUNTRY").Value;
    currency.CurrencyCode = elm.Element("CURRENCYCODE").Value;
    currency.Rate = Convert.ToDouble(elm.Element("RATE").Value);
    currency.Unit = Convert.ToDouble(elm.Element("UNIT").Value);
    currency.Change = Convert.ToDouble(elm.Element("CHANGE").Value);

    MessageBox.Show(elm.Element("CURRENCYCODE").Value);

    curr.Add(currID, currency);
    currID++;
}

但是，我不确定这是否解决了你所遇到的根本问题..

您可以包含System.Net命名空间并初始化XMLHttpRequest对象，并将Response流与静态XDocument.Load（）方法一起使用。

从URL读取XML文件，显示为空

2 个答案: