为项目绑定附件

protected void OkButton_Click(object sender, EventArgs e)
        {
            if (fileUpload.HasFile)
            {
                string strLoginName = HttpContext.Current.User.Identity.Name.ToString();    //获取用户名
                string folderTemp = strLoginName.Substring(strLoginName.LastIndexOf('\') + 1);
                SPSecurity.RunWithElevatedPrivileges(delegate()
                    {
                        try
                        {
                            string FileFolder = Server.MapPath("~/_layouts/images/" + folderTemp + "Upfile/");
                            if (!Directory.Exists(FileFolder))     //根目录
                            {
                                Directory.CreateDirectory(FileFolder);//判断上传目录是否存在     自动创建
                            }
                            string strFilePath = FileFolder + fileUpload.FileName;
                            fileUpload.SaveAs(Server.MapPath("~/_layouts/images/" + folderTemp + "Upfile/" + fileUpload.FileName));
                            AddAttachment(strFilePath);

                        }
                        catch (Exception ex)
                        {
                            throw ex;
                        }
                        finally
                        {
                            string strFileFolder = Server.MapPath("~/_layouts/images/" + folderTemp + "Upfile/");
                            if (Directory.Exists(strFileFolder))     //根目录
                            {
                                //Directory.CreateDirectory(strFileFolder);//判断上传目录是否存在     自动创建
                                Directory.Delete(strFileFolder, true);
                            }
                        }
                    });
            }
            else
            {
                labMess.Visible = true;
            }
        }






public void AddAttachment(string originalImagePath)
        {
            int taskID = int.Parse(hfTaskID.Value);
            string strUrl = hfProjectUrl.Value;
            try
            {
                using (SPWeb spWeb = new SPSite(strUrl).OpenWeb())
                {
                    SPList spList = spWeb.Lists["任务"];
                    SPQuery oQuery = new SPQuery();
                    oQuery.Query = "<Where><Eq><FieldRef Name='ID' /><Value Type='Counter'>" + taskID + "</Value></Eq></Where>";
                    SPListItemCollection listItemCollection = spList.GetItems(oQuery);
                    if (listItemCollection.Count > 0)
                    {
                        SPListItem item = listItemCollection[0];
                        item["Status"] = "已提交";
                        string fileName = fileUpload.FileName;
                        SPAttachmentCollection attach = item.Attachments;
                        if (attach != null)
                        {
                            for (int i = 0; i < attach.Count; i++)
                            {
                                if (attach[i] == fileName)
                                {
                                    attach.Delete(attach[i]);
                                }
                            }
                        }
                        hfProjectTitle.Value = fileName;
                        //HttpPostedFile UpFile = fileUpload.PostedFile;
                        item.Attachments.Add(fileName, GetAttachmentData(originalImagePath));
                        spWeb.AllowUnsafeUpdates = true;
                        item.Update();
                    }
                }
                SendInForm();
            }
            catch (Exception e)
            {
                throw e;
            }
        }

public byte[] GetAttachmentData(string originalImagePath)
        {
            try
            {
                using (FileStream fStream = System.IO.File.OpenRead(originalImagePath))
                {
                    //Stream StreamObject = UpFile.InputStream;//建立数据流对像
                    byte[] btData = new byte[fStream.Length];
                    fStream.Read(btData, 0, btData.Length);
                    fStream.Close();
                    return btData;
                }
            }
            catch (Exception e)
            {
                return null;
            }
        }