/// <summary>Downloads the resource with the specified URI to a local file, asynchronously.</summary>
/// <param name="webClient">The WebClient.</param>
/// <param name="address">The URI from which to download data.</param>
/// <param name="fileName">The name of the local file that is to receive the data.</param>
/// <returns>A Task that contains the downloaded data.</returns>
public static Task DownloadFileTaskAsync(this WebClient webClient, Uri address, string fileName)
{
// Create the task to be returned
var tcs = new TaskCompletionSource <object>(address);
// Setup the callback event handler
AsyncCompletedEventHandler completedHandler = null;
completedHandler = (sender, e) => TaskServices.HandleEapCompletion(tcs, true, e, () => null, () =>
{
webClient.DownloadFileCompleted -= completedHandler;
});
webClient.DownloadFileCompleted += completedHandler;
// Start the async operation.
try
{
webClient.DownloadFileAsync(address, fileName, tcs);
}
catch
{
webClient.DownloadFileCompleted -= completedHandler;
throw;
}
// Return the task that represents the async operation
return(tcs.Task);
}
/// <summary>Downloads the resource with the specified URI as a byte array, asynchronously.</summary>
/// <param name="webClient">The WebClient.</param>
/// <param name="address">The URI from which to download data.</param>
/// <returns>A Task that contains the downloaded data.</returns>
public static Task <byte[]> DownloadDataTaskAsync(this WebClient webClient, Uri address)
{
// Create the task to be returned
var tcs = new TaskCompletionSource <byte[]>(address);
// Setup the callback event handler
DownloadDataCompletedEventHandler completedHandler = null;
completedHandler = (sender, e) => TaskServices.HandleEapCompletion(tcs, true, e, () => e.Result, () => webClient.DownloadDataCompleted -= completedHandler);
webClient.DownloadDataCompleted += completedHandler;
// Start the async operation.
try
{
webClient.DownloadDataAsync(address, tcs);
}
catch
{
webClient.DownloadDataCompleted -= completedHandler;
throw;
}
// Return the task that represents the async operation
return(tcs.Task);
}
/// <summary>Opens a readable stream for the data downloaded from a resource, asynchronously.</summary>
/// <param name="webClient">The WebClient.</param>
/// <param name="address">The URI for which the stream should be opened.</param>
/// <returns>A Task that contains the opened stream.</returns>
public static Task <Stream> OpenReadTaskAsync(this WebClient webClient, Uri address)
{
// Create the task to be returned
var tcs = new TaskCompletionSource <Stream>(address);
// Setup the callback event handler
OpenReadCompletedEventHandler handler = null;
handler = (sender, e) => TaskServices.HandleEapCompletion(tcs, true, e, () => e.Result, () => webClient.OpenReadCompleted -= handler);
webClient.OpenReadCompleted += handler;
// Start the async operation.
try { webClient.OpenReadAsync(address, tcs); }
catch
{
webClient.OpenReadCompleted -= handler;
throw;
}
// Return the task that represents the async operation
return(tcs.Task);
}
/// <summary>Uploads a file to the specified resource, asynchronously.</summary>
/// <param name="webClient">The WebClient.</param>
/// <param name="address">The URI to which the file should be uploaded.</param>
/// <param name="method">The HTTP method that should be used to upload the file.</param>
/// <param name="fileName">A path to the file to upload.</param>
/// <returns>A Task containing the data in the response from the upload.</returns>
public static Task <byte[]> UploadFileTaskAsync(this WebClient webClient, Uri address, string method, string fileName)
{
// Create the task to be returned
var tcs = new TaskCompletionSource <byte[]>(address);
// Setup the callback event handler
UploadFileCompletedEventHandler handler = null;
handler = (sender, e) => TaskServices.HandleEapCompletion(tcs, true, e, () => e.Result, () => webClient.UploadFileCompleted -= handler);
webClient.UploadFileCompleted += handler;
// Start the async operation.
try { webClient.UploadFileAsync(address, method, fileName, tcs); }
catch
{
webClient.UploadFileCompleted -= handler;
throw;
}
// Return the task that represents the async operation
return(tcs.Task);
}
