Question

The code below, is an attempt to get (download) files from a sharepoint.
If I try this on my local version, it works like a charm. I can select all items in the document library.

There are several methods I’ve tried, and I could post some of them here if you like. I can download corrupt files, but even when the link is wrong.
If I try this on the TeamSite in Office 365, I get an exception that my link is wrong. But I’m referring to the same site (instead of localhost/dev/ im referring to http://mysite.com/TeamSite/dev/). Any idea what the difference can be? Does Microsoft block something so external connections aren’t allowed?

  private void btnDownload_Click(object sender, EventArgs e)
    {
        if (comboBox1.Items.Count > 0 && comboBox1.SelectedIndex != -1)
        {
            SaveFileDialog dialog = new SaveFileDialog();
            dialog.ShowDialog();

            using (SPSite site = new SPSite("http://localhost/dev/"))
            {
                using (SPWeb web = site.OpenWeb())
                {
                    SPFolder myLibrary = web.Folders["Management"];

                    foreach (SPFile file in myLibrary.Files)
                    {
                        if (file.Name == comboBox1.SelectedItem.ToString())
                        {
                            byte[] bytes = file.OpenBinary();

                            try
                            {
                                FileStream fs = new FileStream(dialog.FileName, FileMode.Create, FileAccess.ReadWrite);
                                BinaryWriter bw = new BinaryWriter(fs);
                                bw.Write(bytes);
                                bw.Close();
                                MessageBox.Show("File downloaded to: " + dialog.FileName);
                            }
                            catch (Exception ex)
                            {
                                MessageBox.Show(ex.Message);
                            }

                        }                            
                    }
                }
            }
        }
        else
        {
            MessageBox.Show("Select file to download");
        }
    }

This is the Exception message:

The Web application at http://www.gtest.nl/TeamSite/ could not be found. Verify that you have typed the URL correctly. If the URL should be serving existing content, the system administrator may need to add a new request URL mapping to the intended application.

Answer 1

You can not connect to sharepoint site, deployed on another computer like this.
You should use Client Context

for example:

    string siteUrl = "http://MyServer/sites/MySiteCollection";

    ClientContext clientContext = new ClientContext(siteUrl);
    Web oWebsite = clientContext.Web;
    ListCollection collList = oWebsite.Lists;

    clientContext.Load(collList);

    clientContext.ExecuteQuery();

    foreach (SP.List oList in collList)
    {
        Console.WriteLine("Title: {0} Created: {1}", oList.Title, oList.Created.ToString());
    }

you could find more examples on Client Context here

There is allready an example of file download from sharepoint through clientContext.