event-receiver - - 事件接收器项目添加 - 保存冲突 - Sharepoint 2019

Question

只有当 ListItem 有附件时，我才对 itemAdded EventReceiver 有奇怪的问题。所谓的保存冲突错误当然会停止 EventReceiver。如果新的 ListItem 没有附件，那么一切正常。

请看一下我的代码。也许你会找到解决它的方法。

我已经尝试过 allowunsafeupdates、eventfiringEnable/Disable、item.SystemUpdate() 或 .UpdateOverwriteVersion() 等。

这个 ER 的目标只是从其他列表中收集一些数据，计算附件等。正常操作最适合 itemAdded。

此外，我将与列表工作流相关联（从 SharePoint Designer - 设置为手动） - 分享您关于如何执行此操作的想法。

具有最新更新的 Sharepoint Server 2019（6 月 21 日）。

LogOps 方法用于保存一些日志 - 它不是我的 - 只是在网络中找到的。

        public override void ItemAdded(SPItemEventProperties properties)
        {
            SPWeb web = properties.Web;

            if (properties.ListTitle.Contains("Request"))
            {                
                SPListItem itemAdded = properties.ListItem;
                SPList listRequesters = web.Lists["Requesters"];
                SPList listOrganisations = web.Lists["Organisations"];
                                
                string username = new SPFieldUserValue(web, itemAdded["Author"].ToString()).User.Name;
                string queryString = @"<Where><Eq><FieldRef Name='Requester' /><Value Type='User'>" + username + @"</Value></Eq></Where>";
                SPQuery query = new SPQuery
                {
                    Query = queryString
                };

                SPListItemCollection itemresRequesters = listRequesters.GetItems(query);
                string sapNumber = "";
                if (itemresRequesters.Count == 1)
                {
                    foreach (SPListItem itemresult in itemresRequesters)
                    {
                        sapNumber = itemresult["SAPNumber"].ToString();
                        itemAdded["Manager"] = itemresult["ManagerL1"];
                        itemAdded["SAPNumber"] = itemresult["SAPNumber"];
                        itemAdded.Update();
                    }
                }

                else
                {
                    if (itemresRequesters == null)
                    {
                        LogOps("ERItemAdded", "Missing requesters on Requesters list");
                    }
                    else
                    {
                        LogOps("ERItemAdded", "Requesters - multiple users of the same username :" + itemresRequesters.Count);
                    }
                }

                string queryStringOrg = @"<Where><Eq><FieldRef Name='SAPNumber' /><Value Type='Text'>" + sapNumber + @"</Value></Eq></Where>";
                SPQuery queryOrg = new SPQuery
                {
                    Query = queryStringOrg
                };

                SPListItemCollection itemresOrganisations = listOrganisations.GetItems(queryOrg);
                if (itemresOrganisations.Count == 1)
                {
                    foreach (SPListItem itemresult in itemresOrganisations)
                    {
                        itemAdded["ManagerL2"] = itemresult["Manager L2"];
                        itemAdded["ManagerL3"] = itemresult["Manager L3"];
                        itemAdded["Boss"] = itemresult["Boss"];
                        itemAdded.Update();
                        LogOps("ERItemAdded", "Higher Managers updated");
                    }
                }
                else
                {
                    if (itemresOrganisations == null)
                    {
                        LogOps("ERItemAdded", "Organisations - no such Organisation");
                    }
                    else
                    {
                        LogOps("ERItemAdded", "Organisations - too many Organisations :" + itemresOrganisations.Count);
                    }
                }

            //Request Number
            DateTime data = (DateTime)itemAdded["Created"];
                string numerWniosku = sapNumber +"-" + data.ToString("yyyyMMdd") + "-" + itemAdded["ID"];
                itemAdded["Request Number"] = numerWniosku;
                LogOps("ERItemAdded", "Request number : " + itemAdded["Request Number"].ToString());
                //Request status information
                itemAdded["Request Status"] = "Launched";
                //Count Attachements
                int att = itemAdded.Attachments.Count;
                itemAdded["Att"] = att.ToString();
                itemAdded.Update();
                LogOps("ERItemAdded", "Attachments counted : " + itemAdded.Attachments.Count.ToString());
                LogOps("#############", "End of ER");

            }

            else
            {
                LogOps("ERItemAdded", "Improper list");
            }
        }

        private void LogOps(string strEvent, string message)
        {
            FileIOPermission fp = new FileIOPermission(PermissionState.Unrestricted);
            fp.AddPathList(FileIOPermissionAccess.AllAccess, @"d:\Logs");
            StreamWriter sw = File.AppendText(@"D:\Logs\ER_Requests_LOG.txt");
            StringBuilder sb = new StringBuilder();
            sb.Append(DateTime.Now.ToString() + " | " + strEvent +" | " + message + "\n");
            sw.WriteLine(sb.ToString());
            sw.Close();
        }
    }

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