在 Windows Store App 中编辑 XML 文件 [英] Editing XML file in Windows Store App
问题描述
我正在开发 Windows 应用商店应用程序 (8.1),我对 XML 编写感到困惑.我的代码以正确的格式成功创建了 XML 文件.但是我不确定如何将新数据(新歌曲)添加到这个 xml 文件以及如何编辑现有的 xml 文件.长话短说,这是我目前的代码:
I am working on a Windows Store Application (8.1), and i got confused with XML writing. My code successfully creates XML file in a correct format. However i am not sure how to add new data(new songs) to this xml file and how to edit existing xml file. Long story short, here is my code so far:
StorageFolder sf = await ApplicationData.Current.LocalFolder.CreateFolderAsync("UserInputData", CreationCollisionOption.OpenIfExists);
StorageFile st = await sf.CreateFileAsync("MusicData.xml", CreationCollisionOption.OpenIfExists);
XmlDocument xmlDoc = new XmlDocument();
var content = await FileIO.ReadTextAsync(st);
if (!string.IsNullOrEmpty(content))
{
xmlDoc.LoadXml(content);
}
else
{
var root = xmlDoc.CreateElement("music");
xmlDoc.AppendChild(root);
var childTag = xmlDoc.CreateElement("song");
root.AppendChild(childTag);
var childertag = xmlDoc.CreateElement("name");
childTag.AppendChild(childertag);
var childertag2 = xmlDoc.CreateElement("singer");
childTag.AppendChild(childertag2);
var childertag3 = xmlDoc.CreateElement("chords");
childTag.AppendChild(childertag3);
}
await xmlDoc.SaveToFileAsync(st);
使用不存在的 xml 文件是可以的,我只是创建根目录并向该根目录添加新元素,如下所示:
It is okay to work with non-existent xml file, i just create root and add new elements to this root like this:
XmlText textname = xmlDoc.CreateTextNode("test12");
childertag.AppendChild(textname);
我需要帮助的是,将新数据添加到已经存在的 xml 文件中.
The thing i need help with is, adding new data to xml file which already exists.
非常感谢您的反馈.
我的问候...
推荐答案
不是创建新元素,而是选择现有元素,例如:
Instead of creating new element, you need to select the existing element, for example :
var existingRoot = xmlDoc.SelectSingleNode("//music");
然后你可以像添加新的 <song>
元素一样:
Then you can do exactly the same way as you did to add new <song>
element :
var childTag = xmlDoc.CreateElement("song");
existingRoot.AppendChild(childTag);
var childertag = xmlDoc.CreateElement("name");
childTag.AppendChild(childertag);
var childertag2 = xmlDoc.CreateElement("singer");
childTag.AppendChild(childertag2);
var childertag3 = xmlDoc.CreateElement("chords");
childTag.AppendChild(childertag3);
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