从C＃获取XML中的值

Question

This question must be easy, but I faced a problem, which I can't deal with. No matter what I try I am unable to parse this xml with linq and get the xml value.

The error is "System.Collections.Generic.IEnumerable' does not contain a definition for 'Element' and no extension method 'Element' accepting a first argument of type 'System.Collections.Generic.IEnumerable' could be found (are you missing a using directive or an assembly reference?)"

I want to find the Xelement attribute.value which children have a concrete attribute.value. How can I get the attribute.value?

thanks

xml

 <submitInfo>
    <setting name="file1" file ="example3.c" info ="open it!" serializeAs="String">
      <add name="file11" program="example2.c" />
      <add name="file12" value="example1.c" />
      <value />
<setting name="file2" file ="example23.c" info ="open it!" serializeAs="String">
      <add name="file21" program="example22.c" />
      <add name="file22" value="example21.c" />
      <value />

    </setting>
  </submitInfo> 

code:

    var title1 = from q in doc.Element("content").Element("submitInfo").Elements("setting")
                 select q;

    foreach (var t1 in title1)
    {
          Console.WriteLine(
              String.Format( 
                 name = title1.Element("name").Value,
                 file= title1.Element("file").Value,
                 info= title1.Attribute("info").Value));
    }

    //get setting info
    var title = from p in doc.Element("content").Element("submitInfo").Element("setting").Elements("add")
                select p;
    foreach (var t1 in title)
    {
        Console.WriteLine(
              String.Format(                      
                name =  title1.Element("name").Value,
                value = title1.Element("program").Value));

Answer 1

This is one problem:

 name = title1.Element("name").Value,
 file= title1.Element("file").Value,
 info= title1.Attribute("info").Value));

Look at your XML:

<setting name="file1" file ="example3.c" info ="open it!" serializeAs="String">
  <add name="file11" program="example2.c" />
  <add name="file12" value="example1.c" />
  <value />
</setting>

It doesn't have a name or file element - those are attributes. So you want something like:

string name = t1.Attribute("name");
string file = t1.Attribute("file");
string info = t1.Attribute("info");

Note that this is using t1 , not title1 - otherwise you're asking for the data from the query, rather than for the specific element of the query.

Additionally, you really don't need a query expression here. Just use:

var title1 = doc.Element("content").Element("submitInfo").Elements("setting"); 

Another problem is that you're currently calling string.Format with three assignments inside. I suspect you actually wanted:

Console.WriteLine("{0} {1} {2}", t1.Attribute("name"),
                  t1.Attribute("file"), t1.Attribute("info"));