如何在 Windows Phone 7 中以编程方式检索下载的文件？

发布于 2024-11-27 16:46:40 字数 484 浏览 1 评论 0原文

我正在网上下载 epub 文件。为此，我首先使用 Directory.CreateDirectory 创建了一个目录，然后使用以下代码下载了文件。

WebClient webClient = new WebClient();
webClient.DownloadStringAsync(new Uri(downloadedURL), directoryName);
webClient.DownloadProgressChanged += 
                   new DownloadProgressChangedEventHandler(ProgressChanged);
webClient.DownloadStringCompleted += 
                   new DownloadStringCompletedEventHandler(Completed);

这是下载文件的正确方法吗？查看下载的文件并将其显示在网格中的代码是什么？

原文

I am downloading an epub file online. For this I first created a directory using Directory.CreateDirectory, then downloaded the file using following code.

WebClient webClient = new WebClient();
webClient.DownloadStringAsync(new Uri(downloadedURL), directoryName);
webClient.DownloadProgressChanged += 
                   new DownloadProgressChangedEventHandler(ProgressChanged);
webClient.DownloadStringCompleted += 
                   new DownloadStringCompletedEventHandler(Completed);

Is this the correct way of downloading files? What is the code to view the file which is downloaded and displaying it in a grid?

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冬天的雪花 2024-12-04 16:46:40

1) 您不应在 Windows Phone 上使用 Directory.CreateDirectory。相反，由于您在独立存储上操作，因此需要使用：

var file = IsolatedStorageFile.GetUserStoreForApplication();
file.CreateDirectory("myDirectory");

2) 下载文件可以通过 WebClient 完成：

WebClient client = new WebClient();
client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
client.OpenReadAsync(new Uri("your_URL"));


void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
    var file = IsolatedStorageFile.GetUserStoreForApplication();

    using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream("file.epub", System.IO.FileMode.Create, file))
    {
        byte[] buffer = new byte[1024];
        while (e.Result.Read(buffer, 0, buffer.Length) > 0)
        {
            stream.Write(buffer, 0, buffer.Length);
        }
    }
}

在这种情况下直接创建目录是可选的。如果您需要将文件保存在嵌套的文件夹结构中，不妨将文件路径设置为/Folder/NewFolder/file.epub之类的内容。

3) 要枚举独立存储中的文件，您可以使用：

var file = IsolatedStorageFile.GetUserStoreForApplication();
file.GetFileNames();

如果文件位于 IsoStore 的根目录中。如果它们位于目录内，则必须设置搜索模式并将其传递给 GetFileNames - 包括文件夹名称和文件类型。对于每个文件，您可以使用以下模式：

DIRECTORY_NAME\*.*

1) You should not use Directory.CreateDirectory on Windows Phone. Instead, since you are operating on Isolated Storage, you need to use:

var file = IsolatedStorageFile.GetUserStoreForApplication();
file.CreateDirectory("myDirectory");

2) Downloading files can be done through WebClient this way:

WebClient client = new WebClient();
client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
client.OpenReadAsync(new Uri("your_URL"));


void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
    var file = IsolatedStorageFile.GetUserStoreForApplication();

    using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream("file.epub", System.IO.FileMode.Create, file))
    {
        byte[] buffer = new byte[1024];
        while (e.Result.Read(buffer, 0, buffer.Length) > 0)
        {
            stream.Write(buffer, 0, buffer.Length);
        }
    }
}

Creating a directory directly in this case is optional. If you need to save the file in a nested folder structure, you might as well set the file path to something like /Folder/NewFolder/file.epub.

3) To enumerate files in the Isolated Storage, you could use:

var file = IsolatedStorageFile.GetUserStoreForApplication();
file.GetFileNames();

That's if the files are located in the root of the IsoStore. If those are located inside a directory, you will have to set a search pattern and pass it to GetFileNames - including the folder name and file type. For every single file, you could use this pattern: