private async void btnDownload_Click()
{
var file = SelectedItem as FileInfo;
if (file == null)
{
return;
}
if (DownloadFileAction != null)
{
DownloadFileAction.Invoke(JSRuntime, file.FullName);
return;
}
System.Threading.CancellationTokenSource cts = new System.Threading.CancellationTokenSource();
loading.Show(TextDownload, file.Name, false, cts.Cancel);
var stopwatch = new System.Diagnostics.Stopwatch();
stopwatch.Start();
DateTime lastDisplayTime = DateTime.MinValue;
byte[] buffer = new byte[24 * 1024];
var fileSize = file.Length;
long readTotalCount = 0;
try
{
using (var fs = file.OpenRead())
{
while (!cts.IsCancellationRequested)
{
var ret = fs.Read(buffer, 0, buffer.Length);
if (ret <= 0)
{
break;
}
readTotalCount += ret;
if ((DateTime.Now - lastDisplayTime).TotalSeconds > 0.5 && stopwatch.ElapsedMilliseconds > 0)
{
StringBuilder sb = new StringBuilder();
var speed = Convert.ToDouble(readTotalCount / stopwatch.ElapsedMilliseconds);
sb.Append(TextTransferSpeed + ": " + storageUSC.GetString(Convert.ToDecimal(speed * 1000), 1, true) + "B/s");
var remainingTime = TimeSpan.FromMilliseconds((fileSize - readTotalCount) / speed);
sb.Append("," + TextRemainingTime + ": " + remainingTime.ToString(@"hh\:mm\:ss"));
loading.UpdateProgress(Convert.ToInt32(readTotalCount * 100 / fileSize), sb.ToString());
await InvokeAsync(StateHasChanged);
lastDisplayTime = DateTime.Now;
}
await BlazorDownloadFileService.AddBuffer(new ArraySegment <byte>(buffer, 0, ret), cts.Token);
}
}
if (cts.IsCancellationRequested)
{
alert.Show(TextUpload, TextCanceled);
return;
}
var result = await BlazorDownloadFileService.DownloadBinaryBuffers(file.Name, cts.Token);
if (!result.Succeeded)
{
alert.Show(TextDownload, TextFailed + Environment.NewLine + result.ErrorName + Environment.NewLine + result.ErrorMessage);
}
}
catch (TaskCanceledException)
{
alert.Show(TextUpload, TextCanceled);
}
catch (Exception ex)
{
alert.Show(TextUpload, TextFailed + Environment.NewLine + ExceptionUtils.GetExceptionMessage(ex));
}
finally
{
await BlazorDownloadFileService.ClearBuffers();
stopwatch.Stop();
loading.Close();
}
}
