/// <summary>
/// Asynchronously downloads a file at the specified URL.
/// </summary>
/// <param name="client">The flurl client.</param>
/// <param name="localFolderPath">Path of local folder where file is to be downloaded.</param>
/// <param name="localFileName">Name of local file. If not specified, the source filename (last segment of the URL) is used.</param>
/// <param name="bufferSize">Buffer size in bytes. Default is 4096.</param>
/// <returns>A Task whose result is the local path of the downloaded file.</returns>
public static async Task <string> DownloadFileAsync(this FlurlClient client, string localFolderPath, string localFileName = null, int bufferSize = 4096)
{
if (localFileName == null)
{
localFileName = client.Url.Path.Split('/').Last();
}
// need to temporarily disable autodispose if set, otherwise reading from stream will fail
var autoDispose = client.AutoDispose;
client.AutoDispose = false;
try {
var response = await client.SendAsync(HttpMethod.Get, completionOption : HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false);
// http://codereview.stackexchange.com/a/18679
using (var httpStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
using (var filestream = await FileUtil.OpenWriteAsync(localFolderPath, localFileName, bufferSize).ConfigureAwait(false)) {
await httpStream.CopyToAsync(filestream, bufferSize).ConfigureAwait(false);
}
return(FileUtil.CombinePath(localFolderPath, localFileName));
}
finally {
client.AutoDispose = autoDispose;
if (client.AutoDispose)
{
client.Dispose();
}
}
}
/// <summary>
/// Asynchronously downloads a file at the specified URL.
/// </summary>
/// <param name="localFolderPath">Path of local folder where file is to be downloaded.</param>
/// <param name="localFileName">Name of local file. If not specified, the source filename (last segment of the URL) is used.</param>
/// <param name="bufferSize">Buffer size in bytes. Default is 4096.</param>
/// <returns>A Task whose result is the local path of the downloaded file.</returns>
public static async Task <string> DownloadFileAsync(this FlurlClient client, string localFolderPath, string localFileName = null, int bufferSize = 4096)
{
if (localFileName == null)
{
localFileName = client.Url.Path.Split('/').Last();
}
if (!Directory.Exists(localFolderPath))
{
Directory.CreateDirectory(localFolderPath);
}
var filePath = Path.Combine(localFolderPath, localFileName);
try {
var response = await client.HttpClient.GetAsync(client.Url, HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false);
// http://codereview.stackexchange.com/a/18679
using (var httpStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
using (var filestream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None, bufferSize, useAsync: true)) {
await httpStream.CopyToAsync(filestream, bufferSize).ConfigureAwait(false);
}
return(filePath);
}
finally {
if (client.AutoDispose)
{
client.Dispose();
}
}
}
/// <summary>
/// Asynchronously downloads a file at the specified URL.
/// </summary>
/// <param name="localFolderPath">Path of local folder where file is to be downloaded.</param>
/// <param name="localFileName">Name of local file. If not specified, the source filename (last segment of the URL) is used.</param>
/// <param name="bufferSize">Buffer size in bytes. Default is 4096.</param>
/// <returns>A Task whose result is the local path of the downloaded file.</returns>
public static async Task <string> DownloadFileAsync(this FlurlClient client, string localFolderPath, string localFileName = null, int bufferSize = 4096)
{
if (localFileName == null)
{
localFileName = client.Url.Path.Split('/').Last();
}
var folder = await EnsureFolderAsync(localFolderPath).ConfigureAwait(false);
var file = await folder.CreateFileAsync(localFileName, CreationCollisionOption.ReplaceExisting).ConfigureAwait(false);
try {
var response = await client.HttpClient.GetAsync(client.Url, HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false);
// http://codereview.stackexchange.com/a/18679
using (var httpStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
using (var filestream = await file.OpenAsync(FileAccess.ReadAndWrite).ConfigureAwait(false)) {
await httpStream.CopyToAsync(filestream, bufferSize).ConfigureAwait(false);
}
return(PortablePath.Combine(localFolderPath, localFileName));
}
finally {
if (client.AutoDispose)
{
client.Dispose();
}
}
}
