我创建了一个新的xml文档(如果找不到),然后打开它以创建一个新条目。然而,它似乎只是将一个已完成的新XML文件附加到我创建的空白文件的末尾
创建后:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Devices />
添加新的xelement后:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Devices /><?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Devices>
<device>
<name>blah</name>
<src00>True</src00>
</device>
</Devices>
我的代码......我尝试添加两种不同的方式,两者都有相同的结果
// Create file if not found
if (!storage.FileExists("settings\\mydevices.xml"))
{
using (IsolatedStorageFileStream stream = storage.OpenFile("settings\\mydevices.xml", FileMode.Create, FileAccess.ReadWrite))
{
XDocument devicesDoc =
new XDocument(
new XDeclaration("1.0", "utf-8", "yes"),
new XElement("Devices")
);
System.IO.StreamWriter file = new System.IO.StreamWriter(stream);
devicesDoc.Save(file);
file.Dispose();
}
}
// Add new device
using (IsolatedStorageFileStream stream = storage.OpenFile("settings\\mydevices.xml", FileMode.Open, FileAccess.ReadWrite))
{
XDocument mydevicesXml = XDocument.Load(stream);
//XElement item= new XElement("device",
// new XElement("name",selectedDeviceName),
// new XElement("src00","True")
// );
//mydevicesXml.Descendants("Devices").First().Add(item);
//mydevicesXml.Element("Devices").Add(item);
mydevicesXml.Root.Add(
new XElement("device",
new XElement("name", selectedDeviceName),
new XElement("src00", "True")));
System.IO.StreamWriter file = new System.IO.StreamWriter(stream);
mydevicesXml.Save(file);
file.Dispose();
答案 0 :(得分:7)
尝试:
XElement root;
if(File.Exists(file))
root = XElement.Load(file);
else
root = new XElement("Devices");
root.Add(new XElement("device",
new XElement("name", selectedDeviceName),
new XElement("src00", "True")));
root.Save(file);