Also, servers may return 500 (Internal Server Error) if the user agent header is missing.ĪllowAutoRedirect is set to true in WebClient instances. For example, to retain queries in the response, you must add a user-agent header. If your request requires an optional header, you must add the header to the Headers collection. You can use the CancelAsync method to attempt to cancel asynchronous operations.Ī WebClient instance does not send optional HTTP headers by default. Returns the data from a resource, without blocking the calling thread.ĭownloads data from a resource and returns a Byte array.ĭownloads data from a resource and returns a Byte array, without blocking the calling thread.ĭownloads data from a resource to a local file.ĭownloads data from a resource to a local file, without blocking the calling thread.ĭownloads a String from a resource and returns a String.ĭownloads a String from a resource, without blocking the calling thread. Returns the data from a resource as a Stream. The following table describes WebClient methods for downloading data from a resource. Sends a String to the resource, without blocking the calling thread. Sends a String to the resource and returns a String containing any response. Sends a NameValueCollection to the resource and returns a Byte array containing any response, without blocking the calling thread. Sends a NameValueCollection to the resource and returns a Byte array containing any response. Sends a local file to the resource, without blocking the calling thread. Sends a local file to the resource and returns a Byte array containing any response. Sends a Byte array to the resource, without blocking the calling thread. Sends a byte array to the resource and returns a Byte array containing any response. Retrieves a Stream used to send data to the resource, without blocking the calling thread. Retrieves a Stream used to send data to the resource. The following table describes WebClient methods for uploading data to a resource. NET Framework supports URIs that begin with http:, https:, ftp:, and file: scheme identifiers. Using data As Stream = client.OpenRead(args(0))īy default. Throw New ApplicationException("Specify the URI of the resource to retrieve.")Ĭ("user-agent", "Mozilla/4.0 (compatible MSIE 6.0 Windows NT 5.2. If args Is Nothing OrElse args.Length = 0 Then Using StreamReader reader = new StreamReader(data) Using Stream data = client.OpenRead(args) Using WebClient client = new WebClient() Ĭ("user-agent", "Mozilla/4.0 (compatible MSIE 6.0 Windows NT 5.2. Throw new ApplicationException("Specify the URI of the resource to retrieve.") StreamReader^ reader = gcnew StreamReader( data ) Throw gcnew ApplicationException( "Specify the URI of the resource to retrieve." ) Ĭlient->Headers->Add( "user-agent", "Mozilla/4.0 (compatible MSIE 6.0 Windows NT 5.2. If ( args = nullptr || args->Length = 1 ) #using Īrray^args = Environment::GetCommandLineArgs() The following code example takes the URI of a resource, retrieves it, and displays the response.
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