GetPutAsync - asynchronous FTP download/upload

GetPutAsync sample (both C# and VB.NET) is identical to GetPut sample, but transfers the files asynchronously in the background.

All methods of the Ftp class have the asynchronous versions that behave according to .NET asynchronous methods design patterns.

Sample codes for .NET 2.0

// begin asynchronous transfer
IAsyncResult asyncResult = ftp.BeginGetFile(
    remotePath,
    localPath,
    new AsyncCallback(MyCallback),
    null
    );

while (!asyncResult.IsCompleted)
{
    // do something else here ...
}

// finish asynchronous operation and get the result
long bytes = ftp.EndGetFile(asyncResult);

' begin asynchronous transfer
Dim asyncResult As IAsyncResult
asyncResult = ftp.BeginGetFile( _
    remotePath, _
    localPath, _
    New AsyncCallback(AddressOf MyCallback), _
    Nothing _
 )

Do
    ' do something else here...
Loop While Not asyncResult.IsCompleted

' get the result
Dim bytes As Long
bytes = ftp.EndGetFile(asyncResult)

Sample codes for .NET 4.0

// begin asynchronous transfer
Task<long> asyncTransfer = ftp.GetFileAsync(remotePath, localPath);
while (!asyncTransfer.IsCompleted)
{
    // do something else here ...
}

// get the result

long bytes = asyncTransfer.Result;

' begin asynchronous transfer
Dim asyncTransfer As Task(Of Long) = ftp.GetFileAsync(remotePath, localPath)

Do
    ' do something else here...
Loop While Not asyncTransfer.IsCompleted

' get the result
Dim bytes As Long = asyncTransfer.Result