看这一点：

var files = section.Elements("Files");

var fileList = new List<string>();

foreach (XElement area in files)
{
    fileList.Add(area.Element("File").Value);
}

您正在遍历每个文件元素，然后找出其中的第一个文件元素。只有一个文件元素 - 你必须遍历内的文件元素

You're iterating over each Files element, and then finding the first File element within it. There's only one Files element - you need to be iterating over the File elements within that.

但是，也有绝对这样做的更好的方法。例如：

However, there are definitely better ways of doing this. For example:

var doc = XDocument.Load(Path.Combine(configPath, Resource.PBRuntimes));
var fileList = (from runtime in doc.Root.Elements("PowerBuilderRunTime")
                where (int) runtime.Element("Version") == pbVersion
                from file in runtime.Element("Files").Elements("File")
                select file.Value)
               .ToList();

请注意，如果有多的匹配 PowerBuilderRunTime 元素，将创建的所有的中的文件列表所有的那些元素。这可能不是你想要的。例如，您可能希望：

Note that if there are multiple matching PowerBuilderRunTime elements, that will create a list with all the files of all those elements. That may not be what you want. For example, you might want:

var doc = XDocument.Load(Path.Combine(configPath, Resource.PBRuntimes));
var runtime = doc.Root
                 .Elements("PowerBuilderRunTime")
                 .Where(r => (int) r.Element("Version") == pbVersion)
                 .Single();

var fileList = runtime.Element("Files")
                      .Elements("File")
                      .Select(x => x.Value)
                      .ToList();

这将验证有完全的一个的匹配运行。

That will validate that there's exactly one matching runtime.