C# 来自web服务的文本块数据

嗨，我需要从web服务获取数据并将它们放入文本块。到下一个代码时，它会给我空文本块。我的代码有问题吗

---

您没有调用

inf

对象的

DownloadStringAsync

。您没有使用

inf\u DownloadStringCompleted

中的

e

参数来使用web服务并解析数据：

    String baseUri = “your service URI";
    WebClient wc = new WebClient();

    public MainPage()
    {
        InitializeComponent();
    wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler     (wc_downloadstringcompleted);
    // event handler that will handle the ‘downloadstringsompleted’ event

           wc.DownloadStringAsync(new Uri(baseUri));    
    //   this method will download your string URI asynchronously    

    }


 void wc_downloadstringcompleted(Object sender, DownloadStringCompletedEventArgs e)
    {
            // method will get fired after URI download completes
             // writes your every code here

            using (XmlReader reader = XmlReader.Create(new StringReader(xmlString)))
            {         
                while (reader.Read())
                {
                    switch (reader.NodeType)
                    {
                        case XmlNodeType.Element:
                            if (reader.Name = "userId")
                                     string str1 = reader.value();
                            break;
                    }
                }
            }

        name.text = str1;
  }

---

看起来您正在分离url而不是其内容。使用

xmlreader

读取结果并解析其内容我从xmlreader中定义了一个对象，并使用它作为任何类对象调用值？？plz，但我不明白如何才能做到这一点？？我为什么要用e@ワラNawras

e.Result

包含下载的数据。更多信息请点击这里

    String baseUri = “your service URI";
    WebClient wc = new WebClient();

    public MainPage()
    {
        InitializeComponent();
    wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler     (wc_downloadstringcompleted);
    // event handler that will handle the ‘downloadstringsompleted’ event

           wc.DownloadStringAsync(new Uri(baseUri));    
    //   this method will download your string URI asynchronously    

    }


 void wc_downloadstringcompleted(Object sender, DownloadStringCompletedEventArgs e)
    {
            // method will get fired after URI download completes
             // writes your every code here

            using (XmlReader reader = XmlReader.Create(new StringReader(xmlString)))
            {         
                while (reader.Read())
                {
                    switch (reader.NodeType)
                    {
                        case XmlNodeType.Element:
                            if (reader.Name = "userId")
                                     string str1 = reader.value();
                            break;
                    }
                }
            }

        name.text = str1;
  }