获取多个节点XML [英] Getting multiple nodes XML

问题描述

Hello CodeProject。

我的XML有点问题。试图创建一个可以显示不同城市温度的​​应用程序。



这是我的XML表格：

Hello CodeProject.
I have a slight problem with XML. Tried to create an application which could show temperatures in different cities.

This is my XML table:

<SERVERS>
 <SERVER name="1">
  <url>http://someeather.com/database.xml</url>
  <search>xml/searchpath/here</search>
 </SERVER>
 <SERVER name="2">
  <url>http://otherweather.com/database.xml</url>
  <search>xml/searchpath/here</search>
 </SERVER>
 <SERVER name="3">
  <url>http://anotherweather.com/database.xml</url>
  <search>xml/searchpath/here</search>
 </SERVER>
</SERVERS>

我必须做的是：

1.根据搜索节点获取每台服务器的温度

2.写出来。



我知道如何获取'responsedoc'并从服务器获取数据，我只是不知道如何分别为这些服务器中的每一个获取响应。



我的代码如下所示：

What I must do, is:
1. Get the temperature from each server, based on the search node
2. write it out.

I know how to get the 'responsedoc' and get the data from the server, I just don't know how to get the responsedoc for each one of these servers separately.

My code looks like this:

XmlNodeList urls = serverDoc.SelectNodes("//servers/server");
string id1 = "1;
string id2 = "2";
string id3 = "3";
foreach(XmlNode node in urls)
{
    string server1 = node.Attributes["name"].InnerText; //Get the attribute name
    //Check if attribute value matches the 'id' provided before foreach.
    if (server1 == name1)
    {
        //Create new node list, so we can get the server url.
        XmlNodeList urls2 = serverDoc.SelectNodes("//servers/server");
        foreach (XmlNode node2 in urls2)
        {
            var serverPath = temp.InnerText;                                //Get the serverpath (the <search> node in .xml)
            WebRequest request = WebRequest.Create(node2["url"].InnerText); //Get the nodes with the name <url>.
            var response = request.GetResponse();                           //Get a response from the server, based on the request node url, that matched the 'name' attribute with the 'id' before this code.
            Stream stream = response.GetResponseStream();                   //Create new stream from the external server for reading
            XmlDocument responseDoc = new XmlDocument();                    //Create new instance for a new xml document
            responseDoc.Load(stream);                                       //Create new xml document from the stream
            var tempOut = responseDoc.SelectSingleNode(serverPath);         //From this new document get the temperature based on the searchpath provided befre this code.
            string temperature = tempOut.Attributes["value"].Value;         //Now get the value from the attribute with the name 'value' from that new xml document, to set the temperature.
            SetTemperature1(temperature);   //Set the value on our method which sets this value on the templbl on our mainview.
        }
    }
}

因此，我为所有其他服务器获得相同的温度，但我需要不同的值每个（显而易见的）。我的代码可能有问题，但我不确定。

Because of this, I'm getting the same temperature for all the other servers, but I need different values for each (obvious). Might be something wrong with my code, but I'm not sure.

推荐答案

正如你所说，上面的代码中可能有些东西是不正确的。我看到你在foreach循环中调用了SetTemperature1（温度），如果这是设置相同的变量，那么最后一个值将覆盖所有的previosu值。



For xml解析你也可以使用XPath。



但我这里没有这个xml解析问题，我认为在一个循环中调用SetTemperature1（温度）会导致最后一个tempetaure值覆盖所有以前的变量值你在SetTemperature1（温度）方法中设置。

As you said perhaps something is infact incorrect in the code above. I see that you are calling SetTemperature1(temperature) inside the foreach loop and if this is setting the same variable then the very last value will overwrite all previosu value.

For xml parsing you can also use XPath.

But I don't this xml parsing is issue here, I think calling SetTemperature1(temperature) in a loop is causing last tempetaure value to overwrite all previous value of variable that you are setting inside SetTemperature1(temperature) method.

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