Detailed explanation of the method of implementing database timing check under .Net7

During software development, sometimes we need to check the data in the database regularly and trigger an action when new data is found. To achieve this requirement, we have a simple demonstration under .Net 7.

PeriodicTimer

The PeriodicTimer class has been added in .Net 6, which can be used to create a timer to call the callback function at fixed intervals. How to use it is as follows:

using var timer = new PeriodicTimer((10));
while (await ())
{
    //Business logic
}

This allows you to perform operations every 10 seconds.

The advantages of PeriodicTimer over traditional Timers are:

• PeriodicTimer will enable us to wait asynchronously for a specified time interval.
• During the execution of the callback, we can block the execution of the next callback until we complete the current operation.

BackgroundService

The BackgroundService class in AspNetCore is an abstract class that implements the IHostService interface and can be used to create background services. How to use it is as follows:

using System;
using ;
using ;
using ;

namespace ConsoleApp1
{
    public class DatabaseCheckService : BackgroundService
    {
        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            while (!)
            {
                ("Checking database...");
                // Check the database code                await ((5), stoppingToken);
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var host = new HostBuilder()
                .ConfigureServices((hostContext, services) =>
                {
                    <DatabaseCheckService>();
                })
                .Build();

            ();
        }
    }
}

In this example, we inherited the BackgroundService class and override the ExecuteAsync method. The ExecuteAsync method is called when the background service is started and exits when the parameter stopToken is cancelled. We use the method in the while loop to wait for 5 seconds and call the code to check the database in each loop.

Use in combination

We can combine PeriodicTimer and BackgroundService to implement a backend service that checks the database regularly. The code is as follows:

using System;
using ;
using ;
using ;
using ;

namespace ConsoleApp1
{
    public class DatabaseCheckService : BackgroundService
    {
        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            using var timer = new PeriodicTimer((10));
            while (!)
            {
                if (await (stoppingToken))
                {
                    ("Checking database...");
                    // Check the database code                }
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var host = new HostBuilder()
                .ConfigureServices((hostContext, services) =>
                {
                    <DatabaseCheckService>();
                })
                .Build();

            ();
        }
    }
}

Summarize

In this article, we describe how to implement a backend service that checks the database regularly using the PeriodicTimer class and the BackgroundService class in .Net 7. There will be more complex scenarios in actual use, and this article is just a simple example.

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