Windows Phone -隔离存储异常

本文关键字：存储 异常 隔离 Phone Windows | 更新日期: 2023-09-27 18:18:00

下面的代码捕获用户选择的服务器路径并保存在IsolatedStorage上:

private void ConfSalvar(object sender, RoutedEventArgs e)
{
    IsolatedStorageSettings iso = IsolatedStorageSettings.ApplicationSettings;
    if (iso.Contains("isoServer"))
    {
        iso["isoServer"] = server.Text;
    }
    else
    {
        iso.Add("isoServer", server.Text);
    }
}

下一个代码(另一个屏幕)，使用保存在IsolatedStorage上的服务器路径来创建URL:

IsolatedStorageSettings iso = IsolatedStorageSettings.ApplicationSettings;

if (iso.TryGetValue<string>("isoServer", out retornaNome))
{
    serv = retornaNome;
}

 private void sinc(object sender, EventArgs e)
 {
     order.Visibility = Visibility.Collapsed;
     client = new WebClient();
     url = serv + "/json.html";
     Uri uri = new Uri(url, UriKind.RelativeOrAbsolute);
     client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
     client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged);
     client.OpenReadAsync(uri);
}
private void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
    string strFileName = url.Substring(url.LastIndexOf("/") + 1, (url.Length - url.LastIndexOf("/") - 1));
    IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication();
    //  Path Storage
    // *** If File Exists
    if (isoStore.FileExists(strFileName))
    {
        isoStore.DeleteFile(strFileName);
    }
    IsolatedStorageFileStream dataFile = new IsolatedStorageFileStream(strFileName, FileMode.CreateNew, isoStore);
    long fileLen = e.Result.Length;
    byte[] b = new byte[fileLen];
    e.Result.Read(b, 0, b.Length);
    dataFile.Write(b, 0, b.Length);
    dataFile.Flush();
    object lenghtOfFile = dataFile.Length;
    dataFile.Close();
    order.Visibility = Visibility.Visible;
    ProgressBar1.Visibility = Visibility.Collapsed;
    MessageBox.Show("Arquivo salvo!");
}
private void client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
    ProgressBar1.Visibility = Visibility.Visible;
    this.ProgressBar1.Value = e.ProgressPercentage;            
}

所以，如果我保存了文件路径，然后立即点击"sinc"按钮，就会出现一个异常，在操作过程中出现异常，使结果无效。查看InnerException获取异常详细信息。但是如果我保存文件路径并关闭应用程序，打开应用程序并点击"sinc"按钮，它就可以工作了。

不好意思

Windows Phone -隔离存储异常

这与IsolatedStorageSettings无关。它工作得很好。问题是当您创建Uri时，您将UriKind设置为RelativeOrAbsolute。

这就是抛出异常和InnerException状态的原因，This operations is not supported for a relative URI。您需要做的是将UriKind更改为Absolute。所以代码块应该是这样的:

private void sinc(object sender, EventArgs e)
{
    if (iso.TryGetValue<string>("isoServer", out retornaNome))
    {
        serv = retornaNome;
    } 
    else 
    {
        // Let the user know.
        return;
    }
    order.Visibility = Visibility.Collapsed;
    client = new WebClient();
    url = serv + "/json.html";
    Uri uri = new Uri(url, UriKind.Absolute); // <<< Absolute instead of RelativeOrAbsolute
    client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
    client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged);
    client.OpenReadAsync(uri);
}

这应该可以解决你的问题，并正常工作:)

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