WebClient.UploadFile pass upload file as stream

Question

I am trying to use WebClient.UploadFile in my project to post file to server. WebClient.UploadFile accept file name uri as parameter but I would like to pass file stream instead of file name uri. Is that possible with WebClient?

Answer 1

Here are some examples that shows how to write stream to the specified resource using WebClient class:

Using WebClient.OpenWrite:

using (var client = new WebClient())
{
     var fileContent = System.IO.File.ReadAllBytes(fileName);
     using (var postStream = client.OpenWrite(endpointUrl))
     {
         postStream.Write(fileContent, 0, fileContent.Length);
     }
 }

Using WebClient.OpenWriteAsync:

using (var client = new WebClient())
{
     client.OpenWriteCompleted += (sender, e) =>
     {
        var fileContent = System.IO.File.ReadAllBytes(fileName);
        using (var postStream = e.Result)
        {
            postStream.Write(fileContent, 0, fileContent.Length);    
        }
     };
     client.OpenWriteAsync(new Uri(endpointUrl));
 }

Answer 2

You should be able to use the methods WebClient.OpenWrite and OpenWriteAsync to send a stream back to your server.

If you use the later then subscribe to OpenWriteCompleted and use e.Result as the stream to CopyTo.