In this exemple, I will show you how to upload a file to a document library and how to link information to the uploaded file.

According that we have an <asp:FileUpload ID="FileUpload1" runat="server" /> in an aspx page that contains the file path that we want to upload.

1. Open a stream and save the file to an array of bytes.

Stream myStream = FileUpload1.PostedFile.inputStream;

byte[] bytes = new byte[Convert.ToInt32(FileUpload1.PostedFile.ContentLength)];

myStream.Read(bytes, 0, byt.Length);

myStream.Close();

2. Get a document library object and add the file to them.

SPFolder myLibrary = myWeb.Folders["DocumentLibraryName"];

SPFile myFile = myLibrary.Files.Add(myLibrary.ServerRelativeUrl + "/" + FileUpload1.FileName, bytes, false);

3. Update document library.

myLibrary.Update();

Now if you have to add file meta data to the upload file proceed as following.

1.  Get the SPListItem relative to the uploaded file and save information.

SPListItem Item = myFile.Item;

Item["ColumnName"] = "my value";

2. Update the item.

Item.Update();

 

The entire code will look like:

using Microsoft.SharePoint;

using System;

using System.IO;

using System.Web.UI.WebControls;

 

namespace CDG

{

    class Exemple

    {

        protected FileUpload FileUpload1;

 

        public void foo_method()

        {

            using (SPSite mySite = new SPSite("http://server/sites/site"))

            {

                using (SPWeb myWeb = mySite.OpenWeb())

                {

                    Stream myStream = FileUpload1.PostedFile.InputStream;

                    byte[] bytes = new byte[Convert.ToInt32

                                                     (FileUpload1.PostedFile.ContentLength)];

                    myStream.Read(bytes, 0, bytes.Length);

                    myStream.Close();

 

                    SPFolder myLibrary = myWeb.Folders["DocumentLibraryName"];

                    SPFile myFile = myLibrary.Files.Add(myLibrary.ServerRelativeUrl + "/" +

                                                      FileUpload1.FileName, bytes, false);

                    myLibrary.Update();

 

                    SPListItem Item = myFile.Item;

                    Item["ColumnName"] = "my value";

                    Item.Update();

                }

            }

        }

    }

}

 

Cheers.