不允许对独立存储文件流进行操作:Visual Studio 2010 Express for Phone [英] Operation not permitted on IsolatedStorageFileStream: Visual Studio 2010 Express for Phone

问题描述

我遇到此错误:不允许对隔离存储文件流进行操作."我正在将 Visual Studio 2010 express 用于手机 c#.

I am having this error: "Operation not permitted on IsolatedStorageFileStream." I am using visual studio 2010 express for phone c#.

这是我的代码:

        public void LoadData()
        {
           string xmlUrl = "http://datastore.unm.edu/events/events.xml";

        using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
        {

            using (var isoFileStream = new IsolatedStorageFileStream(xmlUrl, FileMode.Open, FileAccess.ReadWrite, FileShare.Read, storage))
            {
                using (XmlReader xreader = XmlReader.Create(isoFileStream))
                {

                }

            }

        }
        }

感谢您的帮助！非常感谢.

Thank you for your help! It's much appreciated.

推荐答案

如果您想从 Web 读取 xml，您应该使用 WebClient 类.WebClient 提供了向由 URI 标识的资源发送数据和从其接收数据的常用方法.

if you want to read a xml from the web you should use the WebClient class. WebClient provides common methods for sending data to and receiving data from a resource identified by a URI.

这是一个小例子

   private WebClient webClient;

    public Example()
    {
        webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DownloadStringCompleted);
        webClient.DownloadStringAsync(new Uri("http://datastore.unm.edu/events/events.xml", UriKind.Absolute));
    }

    private void DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {

        XElement Xmlparse = XElement.Parse(e.Result);


    }

如您所见，我们使用了在异步资源下载操作完成时发生的 DownloadStringCompletedHandler.

as you can see we use DownloadStringCompletedHandler that occurs when an asynchronous resource-download operation completes.

最后解析 XML，您可以使用 XElement 类更多信息在这里

Finally to parse the XML you can use XElement class more informartion here

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