运行Service for Sharepoint 2010时出现System.NullReferenceException [英] System.NullReferenceException in running Service for sharepoint 2010

问题描述

我想启动一项服务，但我在Windows的EventViewer for sharepoint 2010中遇到以下错误。我的错误是：

Hi, I want to start a service but i got the following error in EventViewer of Windows for sharepoint 2010. my error is:

服务无法启动。 System.NullReferenceException：未将对象引用设置为对象的实例。在System.ServiceProcess.ServiceBase.ServiceQueuedMainCallback（对象状态）的AutoMail.Service1.OnStart（String [] args）

Service cannot be started. System.NullReferenceException: Object reference not set to an instance of an object. at AutoMail.Service1.OnStart(String[] args) at System.ServiceProcess.ServiceBase.ServiceQueuedMainCallback(Object state)

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Diagnostics;using System.Linq;using System.ServiceProcess;using System.Text;using System.Net.Mail;using System.Timers;using Microsoft.SharePoint;using Microsoft.SharePoint.Utilities;using Microsoft.SharePoint.WebControls;namespace AutoMail{    public partial class Service1 : ServiceBase    {                DateTime EndDate;        DateTime LastService;        string[] AssetName = new string[5];                public Service1()        {            InitializeComponent();            if (EventLog.SourceExists("AutoMail"))            {                EventLog.CreateEventSource("AutoMail", "Mails");            }            eventLog1.Source = "AutoMail";            eventLog1.Log = "Mails";             if (!System.Diagnostics.EventLog.SourceExists("MailSend"))            {                 System.Diagnostics.EventLog.CreateEventSource("MailSend", "AutoMailLog");             }             eventLog1.Source = "MailSend";            eventLog1.Log = "AutoMailLog";        }        protected override void OnStart(string[] args)        {                 SPSite site1= null;                 SPWeb spWeb = null;                 SPListCollection lists = null;                 SPList list1 = null;                 SPList assetrepository = null;                 SPListItemCollection rplistitemcollection = null;                 SPListItemCollection parlistitemcollection = null;            string SiteUrl = "http://dellserver:15000";           using ( site1 = new SPSite(SiteUrl))            {                using (spWeb = site1.OpenWeb())                {                    lists = spWeb.Lists;                    list1 = spWeb.Lists["PooL Asset Request"];                    assetrepository = spWeb.Lists["Asset Repository"];                    rplistitemcollection = assetrepository.Items;                    parlistitemcollection = list1.Items;                    int i = 0;                    foreach (SPListItem rpListItem in rplistitemcollection)                    {                        LastService = Convert.ToDateTime(rpListItem["LastServiceDate"]);                        EndDate = DateTime.Now;                        string AssetStatus = rpListItem["Status"].ToString();                        TimeSpan span = EndDate.Subtract(LastService);                      //  label1.Text = span.ToString();                        if ((AssetStatus == "Issued") && (Convert.ToInt32(span.Days) > (9)))                        {                            AssetName[i] = rpListItem["Asset Key"].ToString();                            // label1.Text = AssetName[1].ToString();                            i++;                        }                    }                    foreach (SPListItem parListItem in parlistitemcollection)                    {                    }                }                             }           eventLog1.WriteEntry("In OnStart --- Sending Mail to"+AssetName[0].ToString());// ERROR SHOW// IF i replace   eventLog1.WriteEntry("In OnStart --- Sending Mail to"); no error show            System.Timers.Timer time = new System.Timers.Timer();            time.Start();            time.Interval = 30000;            time.Elapsed += time_elapsed;        }        protected override void OnStop()        {        }        public void time_elapsed(object sender, ElapsedEventArgs e)        {            eventLog1.WriteEntry("Mail Sending on "+AssetName[0].ToString());            SendEmail("[e-mail]","[e-mail]", "Automatic Mail sending", "Successfully working contact [e-mail]");        }        public bool SendEmail(string strTo, string strFrom, string strSubject, string strBody)        {            bool flag = false;            MailMessage mailMsg = new MailMessage();            MailAddress mailAddress = null;            try            {                // To                mailMsg.To.Add(strTo);                mailAddress = new MailAddress(strFrom);                mailMsg.From = mailAddress;                mailMsg.Subject = strSubject;                mailMsg.Body = strBody;                SmtpClient smtpClient = new SmtpClient("smtp.gmail.com",587);                              System.Net.NetworkCredential credentials = new System.Net.NetworkCredential("jayant.amar","10307064");                                     smtpClient.Credentials = credentials;                smtpClient.Send(mailMsg);                 flag = true;                eventLog1.WriteEntry("Mail Send Successfully");            }            catch (Exception ex)            {                eventLog1.WriteEntry("Error occured");                //Response.Write(ex.Message);            }            finally            {                mailMsg = null;                mailAddress = null;            }            return flag;        }        private void eventLog1_EntryWritten(object sender, EntryWrittenEventArgs e)        {                               }    }}

推荐答案

你知道哪一行导致你出问题吗？

Do you know which line is causing you problem?

chanmm

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