C# Windows应用商店获取下载进度

经过长时间的努力，我终于获得了一个使用身份验证下载文件的代码，并在windows应用商店应用程序中发送了一个包含范围的头文件，现在下一个级别是获取下载进度条，那么您知道应该使用哪些类和方法来获取下载操作吗

这是我的代码：

var httpClientHandler = new HttpClientHandler();
httpClientHandler.Credentials = new System.Net.NetworkCredential("", "");
var client = new HttpClient(httpClientHandler);

System.Net.Http.HttpRequestMessage request = new System.Net.Http.HttpRequestMessage(HttpMethod.Post, new Uri(""));
request.Headers.Range = new RangeHeaderValue(0,null);
HttpResponseMessage response = await client.SendAsync(request);              
Stream stream = await response.Content.ReadAsStreamAsync();
StorageFile file = await folder.CreateFileAsync(fileName, CreationCollisionOption.GenerateUniqueName);
await Windows.Storage.FileIO.WriteBytesAsync(file, ReadStream(stream));

---

如果从

System.Net.Http.HttpClient

切换到

Windows.Web.Http.HttpClient

，此任务将更容易完成

using Windows.Web.Http;
using Windows.Web.Http.Filters;

private async void Foo(StorageFolder folder, string fileName)
{

    Uri uri = new Uri("http://localhost");
    var filter = new HttpBaseProtocolFilter();
    filter.ServerCredential =
        new Windows.Security.Credentials.PasswordCredential(uri.ToString(), "foo", "bar");
    var client = new HttpClient(filter);

    HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, uri);
    request.Headers.Add("Range", "bytes=0-");

    // Hook up progress handler.
    Progress<HttpProgress> progressCallback = new Progress<HttpProgress>(OnSendRequestProgress);
    var tokenSource = new CancellationTokenSource();
    HttpResponseMessage response = await client.SendRequestAsync(request).AsTask(tokenSource.Token, progressCallback);

    IInputStream inputStream = await response.Content.ReadAsInputStreamAsync();
    StorageFile file = await folder.CreateFileAsync(fileName, CreationCollisionOption.GenerateUniqueName);

    // Copy from stream to stream.
    IOutputStream outputStream = await file.OpenAsync(FileAccessMode.ReadWrite);
    await RandomAccessStream.CopyAndCloseAsync(inputStream, outputStream);
}

private void OnSendRequestProgress(HttpProgress obj)
{
    Debug.WriteLine(obj);
}

使用Windows.Web.Http；
使用Windows.Web.Http.Filters；
专用异步void Foo（StorageFolder文件夹，字符串文件名）
{
Uri=新的Uri（“http://localhost");
var filter=新的HttpBaseProtocolFilter（）；
filter.ServerCredential=
新的Windows.Security.Credentials.PasswordCredential（uri.ToString（），“foo”，“bar”）；
var client=新的HttpClient（过滤器）；
HttpRequestMessage请求=新的HttpRequestMessage（HttpMethod.Post，uri）；
添加（“范围”，“字节=0-”；
//连接进度处理程序。
Progress progressCallback=新进度（OnSendRequestProgress）；
var tokenSource=new CancellationTokenSource（）；
HttpResponseMessage response=wait client.SendRequestAsync（request）.AsTask（tokenSource.Token，progressCallback）；
IIInputStream inputStream=等待响应.Content.ReadAsInputStreamAsync（）；
StorageFile file=wait folder.CreateFileAsync（文件名，CreationCollisionOption.GenerateUniqueName）；
//从一个流复制到另一个流。
IOutputStream outputStream=await file.OpenAsync（FileAccessMode.ReadWrite）；
等待RandomAccessStream.CopyAndCloseAsync（inputStream，outputStream）；
}
私有void OnSendRequestProgress（HttpProgress obj）
{
Debug.WriteLine（obj）；
}

否则，请看一看