/// <summary>
/// Start to download.
/// </summary>
public void Start()
{
// Check whether the destination file exist.
CheckFileOrCreateFile();
// Only Checked downloader can be started.
if (this.status != MultiThreadedWebDownloaderStatus.Checked)
{
throw new ApplicationException(
"Only Checked downloader can be started. ");
}
// If the file does not support "Accept-Ranges" header, then create one
// HttpDownloadClient to download the file in a single thread, else create
// multiple HttpDownloadClients to download the file.
if (!IsRangeSupported)
{
HttpDownloadClient client = new HttpDownloadClient(
this.Url,
this.DownloadPath,
0,
long.MaxValue,
this.BufferSize,
this.BufferCountPerNotification * this.BufferSize);
client.TotalSize = this.TotalSize;
this.downloadClients.Add(client);
}
else
{
// Calculate the block size for each client to download.
int maxSizePerThread =
(int)Math.Ceiling((double)this.TotalSize / this.MaxThreadCount);
if (maxSizePerThread < this.MaxCacheSize)
{
maxSizePerThread = this.MaxCacheSize;
}
long leftSizeToDownload = this.TotalSize;
// The real threads count number is the min value of MaxThreadCount and
// TotalSize / MaxCacheSize.
int threadsCount =
(int)Math.Ceiling((double)this.TotalSize / maxSizePerThread);
for (int i = 0; i < threadsCount; i++)
{
long endPoint = maxSizePerThread * (i + 1) - 1;
long sizeToDownload = maxSizePerThread;
if (endPoint > this.TotalSize)
{
endPoint = this.TotalSize - 1;
sizeToDownload = endPoint - maxSizePerThread * i;
}
// Download a block of the whole file.
HttpDownloadClient client = new HttpDownloadClient(
this.Url,
this.DownloadPath,
maxSizePerThread * i,
endPoint);
client.TotalSize = sizeToDownload;
this.downloadClients.Add(client);
}
}
// Set the lastStartTime to calculate the used time.
lastStartTime = DateTime.Now;
// Set the downloading status.
this.Status = MultiThreadedWebDownloaderStatus.Downloading;
// Start all HttpDownloadClients.
foreach (var client in this.downloadClients)
{
if (this.Proxy != null)
{
client.Proxy = this.Proxy;
}
// Register the events of HttpDownloadClients.
client.DownloadProgressChanged +=
new EventHandler <HttpDownloadClientProgressChangedEventArgs>(
client_DownloadProgressChanged);
client.StatusChanged += new EventHandler(client_StatusChanged);
client.ErrorOccurred += new EventHandler <ErrorEventArgs>(
client_ErrorOccurred);
client.Start();
}
}
/// <summary>
/// Start to download.
/// </summary>
public void Start()
{
// Check whether the destination file exist.
CheckFileOrCreateFile();
// Only Checked downloader can be started.
if (this.status != MultiThreadedWebDownloaderStatus.Checked)
{
throw new ApplicationException(
"Only Checked downloader can be started. ");
}
// If the file does not support "Accept-Ranges" header, then create one
// HttpDownloadClient to download the file in a single thread, else create
// multiple HttpDownloadClients to download the file.
if (!IsRangeSupported)
{
HttpDownloadClient client = new HttpDownloadClient(
this.Url,
this.DownloadPath,
0,
long.MaxValue,
this.BufferSize,
this.BufferCountPerNotification * this.BufferSize);
client.TotalSize = this.TotalSize;
this.downloadClients.Add(client);
}
else
{
// Calculate the block size for each client to download.
int maxSizePerThread =
(int)Math.Ceiling((double)this.TotalSize / this.MaxThreadCount);
if (maxSizePerThread < this.MaxCacheSize)
{
maxSizePerThread = this.MaxCacheSize;
}
long leftSizeToDownload = this.TotalSize;
// The real threads count number is the min value of MaxThreadCount and
// TotalSize / MaxCacheSize.
int threadsCount =
(int)Math.Ceiling((double)this.TotalSize / maxSizePerThread);
for (int i = 0; i < threadsCount; i++)
{
long endPoint = maxSizePerThread * (i + 1) - 1;
long sizeToDownload = maxSizePerThread;
if (endPoint > this.TotalSize)
{
endPoint = this.TotalSize - 1;
sizeToDownload = endPoint - maxSizePerThread * i;
}
// Download a block of the whole file.
HttpDownloadClient client = new HttpDownloadClient(
this.Url,
this.DownloadPath,
maxSizePerThread * i,
endPoint);
client.TotalSize = sizeToDownload;
this.downloadClients.Add(client);
}
}
// Set the lastStartTime to calculate the used time.
lastStartTime = DateTime.Now;
// Set the downloading status.
this.Status = MultiThreadedWebDownloaderStatus.Downloading;
// Start all HttpDownloadClients.
foreach (var client in this.downloadClients)
{
if (this.Proxy != null)
{
client.Proxy = this.Proxy;
}
// Register the events of HttpDownloadClients.
client.DownloadProgressChanged +=
new EventHandler<HttpDownloadClientProgressChangedEventArgs>(
client_DownloadProgressChanged);
client.StatusChanged += new EventHandler(client_StatusChanged);
client.ErrorOccurred += new EventHandler<ErrorEventArgs>(
client_ErrorOccurred);
client.Start();
}
}
