private static async Task DownloadHelper(
DownloadableFile downloadableFile,
int retry = 1,
System.Net.DownloadProgressChangedEventHandler onDownloadProgressChanged = null
)
{
if (downloadableFile.Url == null)
{
return;
}
//uncomment the following line to force re-download every time.
//File.Delete(downloadableFile.LocalFile);
if (!File.Exists(downloadableFile.LocalFile) || new FileInfo(downloadableFile.LocalFile).Length == 0)
{
try
{
//Download the file
Trace.WriteLine("downloading file from:" + downloadableFile.Url + " to: " + downloadableFile.LocalFile);
System.Net.WebClient downloadClient = new System.Net.WebClient();
if (onDownloadProgressChanged != null)
{
downloadClient.DownloadProgressChanged += onDownloadProgressChanged;
}
FileInfo fi = new FileInfo(downloadableFile.LocalFile);
if (!fi.Directory.Exists)
{
fi.Directory.Create();
}
await downloadClient.DownloadFileTaskAsync(new Uri(downloadableFile.Url), downloadableFile.LocalFile);
}
catch (Exception e)
{
if (File.Exists(downloadableFile.LocalFile))
{
//The downloaded file may be corrupted, should delete it
File.Delete(downloadableFile.LocalFile);
}
if (retry > 0)
{
await DownloadHelper(downloadableFile, retry - 1);
}
else
{
#if UNITY_EDITOR || UNITY_IOS || UNITY_ANDROID || UNITY_STANDALONE
UnityEngine.Debug.Log(e.StackTrace);
#else
Trace.WriteLine(e);
#endif
throw;
}
}
}
}
private static async Task DownloadHelper(
DownloadableFile downloadableFile,
int retry = 1,
System.Net.DownloadProgressChangedEventHandler onDownloadProgressChanged = null
)
{
if (downloadableFile.Url == null)
{
return;
}
//uncomment the following line to force re-download every time.
//File.Delete(downloadableFile.LocalFile);
if (!downloadableFile.IsLocalFileValid)
{
try
{
//Download the file
Trace.WriteLine("downloading file from:" + downloadableFile.Url + " to: " + downloadableFile.LocalFile);
System.Net.WebClient downloadClient = new System.Net.WebClient();
if (onDownloadProgressChanged != null)
{
downloadClient.DownloadProgressChanged += onDownloadProgressChanged;
}
FileInfo fi = new FileInfo(downloadableFile.LocalFile);
if (!fi.Directory.Exists)
{
fi.Directory.Create();
}
await downloadClient.DownloadFileTaskAsync(new Uri(downloadableFile.Url), downloadableFile.LocalFile);
}
catch (Exception e)
{
if (!downloadableFile.IsLocalFileValid)
{
//The downloaded file may be corrupted, should delete it
File.Delete(downloadableFile.LocalFile);
}
if (retry > 0)
{
await DownloadHelper(downloadableFile, retry - 1);
}
else
{
Trace.WriteLine(e);
throw;
}
}
}
}
private static async Task DownloadHelperMultiple(
DownloadableFile[] downloadableFiles,
int retry = 1,
System.Net.DownloadProgressChangedEventHandler onDownloadProgressChanged = null)
{
if (downloadableFiles == null || downloadableFiles.Length == 0)
{
return;
}
else if (downloadableFiles.Length == 1)
{
await DownloadHelper(downloadableFiles[0], retry, onDownloadProgressChanged);
}
else
{
DownloadableFile currentFile = downloadableFiles[0];
DownloadableFile[] remainingFiles = new DownloadableFile[downloadableFiles.Length - 1];
Array.Copy(downloadableFiles, 1, remainingFiles, 0, remainingFiles.Length);
await DownloadHelper(currentFile, retry, onDownloadProgressChanged);
await DownloadHelperMultiple(remainingFiles, retry, onDownloadProgressChanged);
}
}
/// <summary>
/// Add a file to download
/// </summary>
/// <param name="downloadableFile">The file to be downloaded</param>
public void AddFile(DownloadableFile downloadableFile)
{
_files.Add(downloadableFile);
}