Windows Phone 8.1中的后台任务上的显示对话框出现问题 [英] Problems with show dialog on Background task in windows phone 8.1

问题描述

我有这段代码用于在后台方法中执行httpwebrequest和响应，我只想在下载zip崩溃并且我的代码进入此捕获时显示对话框以获取信息.

I have this code for execute httpwebrequest and response in background method and i just want show dialog for information when download zip crashed and my code enter in this catch...

    private void DoSincroFit()
    {
        HttpWebRequest request = HttpWebRequest.CreateHttp(url);
        request.BeginGetResponse(new AsyncCallback(playResponseAsync), request);
    }

    public async void playResponseAsync(IAsyncResult asyncResult)
    {
        //Declaration of variables
        HttpWebRequest webRequest = (HttpWebRequest)asyncResult.AsyncState;

        try
        {
            string fileName = "sincrofit.rar";

            using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.EndGetResponse(asyncResult))
            {
                byte[] buffer = new byte[1024];


                var newZipFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
                var newZipFile = await KnownFolders.DocumentsLibrary.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);

                using (var writeStream = await newZipFile.OpenAsync(FileAccessMode.ReadWrite))
                {
                    using (var outputStream = writeStream.GetOutputStreamAt(0))
                    {
                        using (var dataWriter = new DataWriter(outputStream))
                        {
                            using (Stream input = webResponse.GetResponseStream())
                            {
                                var totalSize = 0;
                                for (int size = input.Read(buffer, 0, buffer.Length); size > 0; size = input.Read(buffer, 0, buffer.Length))
                                {
                                    dataWriter.WriteBytes(buffer);
                                    totalSize += size;    //get the progress of download
                                }
                                await dataWriter.StoreAsync();
                                await outputStream.FlushAsync();
                                dataWriter.DetachStream();
                            }
                        }
                    }
                }

            }
        }
        catch
        {
           SMethods.Message_Dialog("Download has stopped!","Error");
        }
    }

但是当我的代码执行此方法时，请从此类中进行:

But when my code execute this method, from this class:

class StandarMethods
{
public async void Message_Dialog(string text, string title)
    {
        //Declaration of variables
        MessageDialog MDialog = new MessageDialog(text, title);

        await MDialog.ShowAsync();
    }
}

最后，我的应用在尝试执行时崩溃:

Finally my app crash when try to execute:

await MDialog.ShowAsync();

这正在等待后台任务...有人可以帮助我吗?可能是时候使用事件处理程序了吗?为什么?如何?预先感谢！

This await in background task... Someone can helps me? It's possible time to use Event Handlers? Why? How? Thanks in advance!

推荐答案

解决了，我的最终代码在这里:

Solved, and my final code is here:

    private CoreDispatcher dispatcher;

    private void DoSincroFit()
    {
        HttpWebRequest request = HttpWebRequest.CreateHttp(url);

        //Add headers to request
        request.Headers["Type"] = "sincrofit";
        request.Headers["Device"] = "1";
        request.Headers["Version"] = "0.000";
        request.Headers["Os"] = "WindowsPhone";

        dispatcher = CoreWindow.GetForCurrentThread().Dispatcher;
        request.BeginGetResponse(new AsyncCallback(playResponseAsync), request);
    }

    public async void playResponseAsync(IAsyncResult asyncResult)
    {
        //Declaration of variables
        HttpWebRequest webRequest = (HttpWebRequest)asyncResult.AsyncState;

        try
        {
            //For download file  with stream
            //http://social.msdn.microsoft.com/Forums/windowsapps/en-US/de96a61c-e089-4595-8349-612be5d23ee6/download-file-with-httpwebrequest?forum=winappswithcsharp
            string fileName = "sincrofit.rar";

            using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.EndGetResponse(asyncResult))
            {
                byte[] buffer = new byte[1024];

                //For acces Local folder of phone device
                //http://social.msdn.microsoft.com/Forums/windowsapps/en-US/ec99721c-6565-4ce9-b6cc-218f2265f9c7/what-is-the-uri-of-an-isolatedstorage-file?forum=wpdevelop
                var newZipFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);

                using (var writeStream = await newZipFile.OpenAsync(FileAccessMode.ReadWrite))
                {
                    using (var outputStream = writeStream.GetOutputStreamAt(0))
                    {
                        using (var dataWriter = new DataWriter(outputStream))
                        {
                            using (Stream input = webResponse.GetResponseStream())
                            {
                                var totalSize = 0;

                                for (int size = input.Read(buffer, 0, buffer.Length); size > 0; size = input.Read(buffer, 0, buffer.Length))
                                {
                                    dataWriter.WriteBytes(buffer);
                                    totalSize += size;    //get the progress of download

                                    dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
                                    {
                                        //Declaration of variables
                                        pBar.Value = sizeFit / totalSize * 100;
                                    });
                                }
                                await dataWriter.StoreAsync();
                                await outputStream.FlushAsync();
                                dataWriter.DetachStream();
                            }
                        }
                    }
                }

            }
        }
        catch
        {
            dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
            {
                //Declaration of variables
                SMethods.Message_Dialog("Download has stopped!", "Error");
            });
        }
    }

感谢您的时间@loop！

Thanks for your time @loop!

这篇关于Windows Phone 8.1中的后台任务上的显示对话框出现问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！