从OpenCart中按类别检索产品(Retrieve Products By Category from OpenCart)

 你的代码不起作用的原因是因为你的循环是： 
 
for (var i = 0; i <= folderList.Count; i++)
 
 ...其中folderList是Folder_Settings元素的列表。 只有其中一个，所以你要迭代两次。 你实际上并没有使用folderList[i] ，这是一个很好的工作，因为否则你将在第二次迭代中超出范围。 这样的循环应该总是使用<而不是<= 。 
 
 但是，我强烈建议使用LINQ to XML而不是XmlDocument - 它使一切变得更加简单。 我也建议你尽可能使用foreach循环： 
 
var doc = XDocument.Load("Settings.xml");
foreach (var element in doc.Root.Elements("OtherFolderSettings))
{
    listBox1.Items.Add(element.Value);
}
 
 （哦，并使用语句来干净地关闭资源......） 

The reason your code isn't working is because your loop is:
 
for (var i = 0; i <= folderList.Count; i++)
 
... where folderList is the list of Folder_Settings elements. There's only one of those, so you're iterating twice. It's a good job you don't actually use folderList[i], because otherwise you'd be out of bounds on the second iteration. Loops like that should pretty much always use < rather than <=.
 
However, I would strongly recommend using LINQ to XML instead of XmlDocument - it makes everything much simpler. I'd also recommend using foreach loops whenever you can, too:
 
var doc = XDocument.Load("Settings.xml");
foreach (var element in doc.Root.Elements("OtherFolderSettings))
{
    listBox1.Items.Add(element.Value);
}
 
(Oh, and use using statements to close resources cleanly...)