我正在开发一个应用程序来操作Windows Phone 8.1 RT中的XML。代码在
之下private void btnXcute_tapped(object sender, TappedRoutedEventArgs e)
{
xmlmanipulation();
}
private async void xmlmanipulation()
{
Random rand = new Random();
try
{
var filex = await ApplicationData.Current.LocalFolder.OpenStreamForReadAsync(@"xmlfile.xml");
XDocument xdoc = XDocument.Load(filex);
var word = xdoc.Descendants("word");
int max = word.Count();
txt1.Text = word.FirstOrDefault().Value.ToString();
txt1_Copy.Text = xdoc.Descendants("meaning").FirstOrDefault().Value.ToString();
//node removal part
xdoc.Root.Elements("wordset").Where(dim_word => dim_word.Element("word").Value == word.FirstOrDefault().Value.ToString() && dim_word.Element("meaning").Value == xdoc.Descendants("meaning").FirstOrDefault().Value.ToString())
.FirstOrDefault().Remove();
//file overwriting part
var file = await ApplicationData.Current.LocalFolder.CreateFileAsync("xmlfile.xml", CreationCollisionOption.ReplaceExisting);
using (var stream = await file.OpenStreamForWriteAsync())
{
xdoc.Save(stream); // Save XDocument into the stream
stream.Position = 0;
}
}
catch (Exception s)
{
txt1.Text = s.Message;
txt1_Copy.Text = s.Source;
}
}
我已将XML文件(xmlfile.xml)放在项目主文件夹中,如下所示
但我得到The system cannot find the file specified. (Exception from HRESULT:0x80070002)
,而异常来源是mscorlib
。
我是XML操作的新手。请帮我。我需要读取一个XML文件,重新编写其上的第一个<wordset>
元素,在按钮单击上保存文件(覆盖)。我总共有4个<wordset>
个元素,如果按下按钮4次,则会删除文件中的所有元素。
我的XML文件是
<?xml version="1.0" encoding="utf-8" ?>
<xmlfile>
<wordset>
<word>word1</word>
<meaning>meaning1</meaning>
</wordset>
<wordset>
<word>word2</word>
<meaning>meaning2</meaning>
</wordset>
<wordset>
<word>word3</word>
<meaning>meaning3</meaning>
</wordset>
<wordset>
<word>word4</word>
<meaning>meaning4</meaning>
</wordset>
</xmlfile>
答案 0 :(得分:2)
您正尝试从已安装的位置而不是 LocalFolder 访问文件(取决于文件的构建操作)。因此,您应该使用:
var folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
// not:
var folder = ApplicationData.Current.LocalFolder;
您还可以查看this answer。