使用Windows服务在FileSystemEventHandler上插入数据库

Question

我已经设法使服务工作，以及FileSystemEventHandler插入到文本文件中，但现在需要将其更改为插入到数据库和文本文件中。

using System;  
using System.Collections.Generic;  
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Diagnostics;  
using System.IO;  
using System.Linq;  
using System.ServiceProcess;  
using System.Text;  
using System.Threading.Tasks;  
using System.Timers;  
namespace WindowsServiceTest
{
    public partial class Service1 : ServiceBase
    {
        Timer timer = new Timer(); // name space(using System.Timers;)  
        public static string path = ConfigurationManager.AppSettings["findpath"];
        public Service1()
        {
            InitializeComponent();
        } 

        protected override void OnStart(string[] args)
        {
            WriteToFile("Service is started at " + DateTime.Now);
            timer.Elapsed += new ElapsedEventHandler(OnElapsedTime);
            timer.Interval = 10000; //number in milisecinds  
            timer.Enabled = true;
            FileSystemWatcher watcher = new FileSystemWatcher
            {
                Path = path,
                NotifyFilter = NotifyFilters.LastWrite,
            };
            watcher.Created += new FileSystemEventHandler(FileSystemWatcher_Changed);
            watcher.Renamed += new RenamedEventHandler(FileSystemWatcher_Renamed);
            watcher.Changed += new FileSystemEventHandler(FileSystemWatcher_Changed);
            watcher.EnableRaisingEvents = true;
        }

        public static void FileSystemWatcher_Changed(object source, FileSystemEventArgs e)
        {
            using (SqlConnection con = new SqlConnection("Data Source=localhost\\SQLEXPRESS;Database=ServiceTest;Integrated Security=True;"))
            {
                try
                {
                    con.Open();
                    var command = new SqlCommand("Insert into test(URL, Location) values(@URL, @agendaname);", con);
                    command.Parameters.Add("@URL", System.Data.SqlDbType.VarChar, 100).Value = e.Name;
                    command.Parameters.Add("@agendaname", System.Data.SqlDbType.VarChar, 100).Value = "Case History";
                    command.ExecuteNonQuery();
                }
                catch
                {
                    WriteToFile($"Failed to insert: {e.Name} into the database");
                }
            }
        }
        public static void FileSystemWatcher_Renamed(object source, RenamedEventArgs e)
        {
            WriteToFile($"File Renamed: {e.OldFullPath} renamed to {e.FullPath}");
        }
        private void OnElapsedTime(object source, ElapsedEventArgs e)
        {
            WriteToFile("Service is recalled at " + DateTime.Now);
        }
        protected override void OnStop()
        {

            WriteToFile("Service is stopped at " + DateTime.Now);
        }

        public static void WriteToFile(string Message)
        {
            string path = AppDomain.CurrentDomain.BaseDirectory + "\\Logs";
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            string filepath = AppDomain.CurrentDomain.BaseDirectory + "\\Logs\\ServiceLog_" + DateTime.Now.Date.ToShortDateString().Replace('/', '_') + ".txt";
            if (!File.Exists(filepath))
            {
                // Create a file to write to.   
                using (StreamWriter sw = File.CreateText(filepath))
                {
                    sw.WriteLine(Message);
                }
            }
            else
            {
                using (StreamWriter sw = File.AppendText(filepath))
                {
                    sw.WriteLine(Message);
                }
            }
        }
    }
}

我认为我已经完成了数据库插入错误，因为catch块被插入到文本文件中。但是，我在一个单独的项目中运行代码，并在控制台应用程序中插入数据库。

任何帮助表示赞赏，亲切的问候。

Answer 1

Windows服务在与控制台应用程序不同的安全上下文下运行。正如评论所披露的那样，异常与您的连接字符串有关。如果我们分析connectiong字符串，我们可以看到您使用IntegratedSecurity="True".进行身份验证因为您的Windows服务在服务帐户下运行，身份验证失败。我已经指定了2种解决方案。

选项1：让服务作为Windows帐户运行（不推荐但可用于测试）

1. 打开运行框（Win Flag + R）
2. 键入Services.MSC
3. 找到您的服务并右键单击属性
4. 选择登录选项卡
5. 输入您的Windows身份验证用户名和密码，以便运行服务

选项2：创建SQL Server帐户

1. 在SQL中为数据库创建用户名和密码
2. 更新连接字符串以指定创建的新用户名和密码