public MainPageViewModel(INavigationService navigationService, IPublicFileSystem publicFileSystem,
IOpenFileByName openFileByName, IEventAggregator eventAggregator)
{
_navigationService = navigationService;
_eventAggregator = eventAggregator;
_publicFileSystem = publicFileSystem;
_openFileByName = openFileByName;
AskPermissionCommand = new DelegateCommand(() =>
{
_eventAggregator.GetEvent <RuntimePermissionEvent>().Publish(new RuntimePermissionPayload());
});
OpenPDFCommand = new DelegateCommand(async() =>
{
string filename = "PDF.pdf";
IFolder rootFolder = _publicFileSystem.PublicDownloadFolder;
IFile file = await rootFolder.CreateFileAsync(filename, CreationCollisionOption.OpenIfExists);
await file.WriteAllTextAsync("123");
_openFileByName.OpenFile(file.Path);
});
}
public MainPageViewModel(INavigationService navigationService,
IPublicFileSystem publicFileSystem, IOpenFileByName openFileByName)
{
_navigationService = navigationService;
// 注入各平台的非應用程式專屬的沙箱資料夾
_PublicFileSystem = publicFileSystem;
// 使用手機內安裝的App，開啟指定的檔案
_OpenFileByName = openFileByName;
DownloadCommand = new DelegateCommand(async() =>
{
ShowMask = true;
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Complete_list_of_MIME_types
// http://www.feedforall.com/mime-types.htm
string mimeType = "text/plain";
#region 依據所選擇的項目，設定下載來源與檔案名稱
string filename = "";
string url = "";
if (FileSourceTypeSelect.ToLower() == "pdf")
{
filename = "vulcan.pdf";
mimeType = "application/pdf";
url = "https://www.tutorialspoint.com/csharp/csharp_tutorial.pdf";
}
else if (FileSourceTypeSelect.ToLower() == "image")
{
filename = "vulcan.png";
mimeType = "image/png";
url = "https://pluralsight.imgix.net/paths/path-icons/csharp-e7b8fcd4ce.png";
}
else if (FileSourceTypeSelect.ToLower() == "mp3")
{
filename = "vulcan.mp3";
mimeType = "audio/mpeg";
url = "http://video.ch9.ms/ch9/4855/ca67b144-e675-48a2-a0f2-706af9644855/DataTemplateSelector.mp3";
}
else if (FileSourceTypeSelect.ToLower() == "video")
{
filename = "vulcan.mp4";
mimeType = "video/mpeg";
url = "http://video.ch9.ms/ch9/4855/ca67b144-e675-48a2-a0f2-706af9644855/DataTemplateSelector.mp4";
}
else if (FileSourceTypeSelect.ToLower() == "ppt")
{
filename = "vulcan.ppt";
mimeType = "application/vnd.ms-powerpoint";
url = "http://people.csail.mit.edu/mrub/talks/small_world/Seminar07_rubinstein.ppt";
}
else if (FileSourceTypeSelect.ToLower() == "doc")
{
filename = "vulcan.doc";
mimeType = "application/msword";
url = "http://im2.nhu.edu.tw/download.php?filename=270_2af7568a.doc&dir=personal_subject/&title=C%23-%E7%AC%AC%E4%B8%80%E7%AB%A0";
}
#endregion
// 取得要存放該檔案的資料夾
// FileSystem 為 PCLStorage 提供的應用程式沙箱的相關資料夾
IFolder rootFolder = _PublicFileSystem.PublicDownloadFolder;
try
{
// 建立這個檔案
IFile file = await rootFolder.CreateFileAsync(filename,
CreationCollisionOption.OpenIfExists);
// 取得這個檔案的 Stream 物件
using (var fooFileStream = await file.OpenAsync(FileAccess.ReadAndWrite))
{
using (HttpClientHandler handle = new HttpClientHandler())
{
// 建立 HttpClient 物件
using (HttpClient client = new HttpClient(handle))
{
// 取得指定 URL 的 Stream
using (var fooStream = await client.GetStreamAsync(url))
{
// 將網路的檔案 Stream 複製到本機檔案上
fooStream.CopyTo(fooFileStream);
}
}
}
}
_OpenFileByName.MakeDownloadFolder(file.Path, mimeType);
_OpenFileByName.OpenFile(file.Path);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
ShowMask = false;
});
}
