How do I save files that are larger than 1MB using the Client Object Model?

Question

I'm trying to save a file to an SP document library using the Client Object Model:

//populate information about the new file, from disk
FileCreationInformation fci = new FileCreationInformation();
fci.Url = fileName;
fci.Content = System.IO.File.ReadAllBytes(filePath);
fci.Overwrite = true;

//load the file collection for the documents in the library
FileCollection documentFiles = docSetFolder.Files;
clientContext.Load(documentFiles);
clientContext.ExecuteQuery();

//add this file to the file collection
Microsoft.SharePoint.Client.File newFile = documentFiles.Add(fci);
clientContext.Load(newFile);
clientContext.ExecuteQuery();

However, it turns out that by default there is a 1MB size limit when uploading files in this way. (Exception: 400 - Bad Request) This blog post details the options for getting around this. It turns out, though, that simply changing the file upload size as specified in the post won't work - the Microsoft.SharePoint library, which is required to do this, only runs on 64-bit CPUs. This is a reasonable assumption when writing server-side code, but this code is supposed to run on client machines. Seems like a pretty big oversight on Microsoft's part.

So I've got to use the second option.

using (ClientContext clientContext = new ClientContext("http://spsite/sites/TestSite/")) {

    using (FileStream fs = new FileStream(filePath, FileMode.Open))
    {
        string targetUrl = "testfile.txt";

        Microsoft.SharePoint.Client.File.SaveBinaryDirect(clientContext,
            targetUrl,
            fs, true);                    
    }
}

When executing the call to SaveBinaryDirect, I get a 409 (Conflict) exception. What is the problem?

Answer 1

The URL given to SaveBinaryDirect needs to be relative to the root site collection. So calling

    Microsoft.SharePoint.Client.File.SaveBinaryDirect(clientContext,
        "/sites/TestSite/testfile.txt",
        fs, true); 

will work.