SPFile上传文件到文档库

protected void UpLoadDocument()
        {
            string filename = FileUpload1.PostedFile.FileName.Substring(FileUpload1.PostedFile.FileName.LastIndexOf("/")+1);
            Response.Write("filename:"+filename+"<br/>");
            Stream filedataStream = FileUpload1.PostedFile.InputStream;
            int dataLen = FileUpload1.PostedFile.ContentLength;
            Response.Write("dataLen:" + dataLen + "<br/>");
            string fileType = FileUpload1.PostedFile.ContentType;
            Response.Write("fileType:" + fileType + "<br/>");
            byte[] fileData = new byte[dataLen];
            filedataStream.Read(fileData, 0, dataLen);

            SPSite sps = SPControl.GetContextSite(Context);
            sps.AllowUnsafeUpdates = true;
            SPWeb spw = sps.OpenWeb();
            spw.AllowUnsafeUpdates = true;
            SPList list = spw.Lists["TestDocs"];

            SPFolder folder = list.RootFolder;
            bool ex = false;
            Response.Write("folder.Exists:" + folder.Exists + "<br/>");
            //获取不带路径的纯文件名
            filename = FileUpload1.FileName;
            if (folder.Exists)
            {
                try
                {
                    ex = folder.Files[filename].Exists;
                    Response.Write("已有同名文件。");
                    return;
                }
                catch
                {
                    folder.Files.Add(filename, fileData, true);
                }
            }
        }