如何使用 ASP.NET MVC 项目参考从控制台应用程序使用 MYSQL DbContext of ASP.NET MVC

Question

我正在尝试从 .NET 控制台应用程序编写 Windows 服务，该应用程序执行将数据发布到 MySQL 数据库中的操作。我正在尝试使用 ASP.NET 项目中的 DbContext class，但是当我运行控制台应用程序时，数据不会发布。我正在使用 Topshelf 依赖项来创建 Windows 服务并使调试更容易。

我的控制台应用程序代码如下所示：

public class UpdateReceivePost
{
        private readonly Timer timer;// To establish time for service

        public UpdateReceivePost()
        {
            timer = new Timer(1000) { AutoReset = true }; // the service will start in one minute 
            timer.Elapsed += TimerElapsed;//calls a timeelapsed mehodd
        }

        protected IDbFactory DbFactory { get; private set; }

        private void TimerElapsed(object sender, ElapsedEventArgs e)
        {
            UserDbContext dbContext = new UserDbContext();

            ReceivePost receivePost = new ReceivePost()
            {
                Status = "pending"
            };

            dbContext.receivePosts.Add(receivePost);
            dbContext.SaveChanges();

            // string[] lines = new string[] { DateTime.Now.ToString() };
            // File.AppendAllLines(@"F:\nepal.txt", lines);
        }

        public void Start()
        {
            timer.Start();//start the timer
        }

        public void Stop()
        {
            timer.Stop(); //stops the timer
        }
}

Answer 1

您应该将 dbContext class 包装在一个 using 语句中，以便在您完成发布到数据库后将其处理掉。

The lifetime of the context begins when the instance is created and ends when the instance is either disposed or garbage-collected. Use using if you want all the resources that the context controls to be disposed at the end of the block. When you use using, the compiler automatically creates a try/finally block and calls dispose in the finally block.

Install-Package MySQL.Data -Version 6.9.9
Install-Package MySql.Data.Entity -Version 6.9.10

尝试重新安装这些版本的软件包，看看错误是否消失。

private void TimerElapsed(object sender, ElapsedEventArgs e)
 {
    ReceivePost receivePost = new ReceivePost()
    {
       Status = "pending"
    };

    using(UserDbContext dbContext = new UserDbContext())
    {
        dbContext.receivePosts.Add(receivePost);
        dbContext.SaveChanges();
    }

    // string[] lines = new string[] { DateTime.Now.ToString() };
   // File.AppendAllLines(@"F:\nepal.txt", lines);
}

如何使用 ASP.NET MVC 项目参考从控制台应用程序使用 MYSQL DbContext of ASP.NET MVC

How to use MYSQL DbContext of ASP.NET MVC from console application using ASP.NET MVC project reference

.net

c#

asp.net

asp.net-mvc

topshelf