Asynchronous download file

If the QueryString property is not an empty string, it is appended to address. This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in. NET Framework. When using this method in an ASP. NET page, you will receive an error if the account that the page executes under does not have permission to access the local file. A user-defined object that is passed to the method invoked when the asynchronous operation completes.

Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Web Client. Please rate your experience Yes No. You can't use Seek method on that response stream, because one isn't seekable. Look, in debugger, at its property CanSeek which is set to false. You can copy response stream to MemoryStream and then use Seek. Shouldn't there be calls to EndWrite? Is that correct, or are you getting around that somehow?

Many thanks, Taylor. Hello Great job Nishant as always good article. I am trying to retrieve the length of a file through http protocol. GetLength but I understands that not all servers support this. Does anybody knows how to retrieve the file's length? Sincerely yours Y. Re: Getting file length RubensFarias Jan Hi, I have allready found a solution using Seek command.

And about the http verb I have no idea how or what u mean. First thing, I want to say that your program is really good and useful. I'm having a problem, but I don't know to program problem following: I want to download all files which have file extend. Example: - Have 20 file. I'm looking forward to helping from you. I'm very happy If you help me.

Thanks in advance! Problems Anonymous Oct There are 2 problems with this sample: 1. It dosn't check to see if the data has actually arrived yet. This means, if you read the stream too fast, you will get a file full of zeros. How about to get a page with password protected antrim 7-Apr I think it is a problem that you can not get the contents when you request a password proteced page. WebRequest can not keep the context and session, so it can not get the pages which behind an authentication requirement.

Do you have any idea about this issue? You can assign HttpWebRequest. A progress event vbweb Dec Hi, I'm trying to implement some code similar to what you describe here. However, in my class, I also want to trigger a ProgressChange event which would be called in the ReadCallback proc with the current amount of downloaded data.

However, obviously I want the ProgressChange event to be triggered in the original thread, just in case the delegate associated with that event tries to use a progress bar or something and windows forms aren't thread safe.

How do I go about doing this when I don't have an Invoke method available? Updated :- - June 29th Nish Nishant Jun This was one of my oldest articles. I've updated it with more stuff and have added stuff on asynchronous downloading of files.

Re: Updated :- - June 29th nat2kus Jun Will this need the. Net framework to be installed on a clients machine to work? Small improvement Todd Smith Feb Here's a small improvement you could make to the read code. Active 7 years, 3 months ago. Viewed 3k times. I have a question about asynchronous operations in C. How could I do it? Improve this question. Junior Junior 3 3 gold badges 11 11 silver badges 21 21 bronze badges.

Add a comment. Active Oldest Votes. Add DownloadHelper. Improve this answer. I often return void from async methods, but only if I pass a CancellationToken in to async method i. You don't know whether the operation ends or is there an exception.

You should avoid async void — i3arnon. Thank you! It is really great! FindServicePoint new Uri url. ToList ; await Task. You really should not be doing async void here as I highly doubt Download is a event handler.