This example demonstrates how to configure a recurring background task in a .NET Core environment using the Quartz.NET library.

Prerequisites

Ensure the .NET Core SDK is installed on your machine.

Setup Instructions

1. Generate a new console application:

   dotnet new console -n SchedulerApp
   cd SchedulerApp
   

2. Install the Quartz library via NuGet:

   dotnet add package Quartz --version 3.3.3
   

3. Update Program.cs with the following implementation. This defines a job named TimeLoggerTask that triggers every 5 seconds.

   using System;
   using System.Threading.Tasks;
   using Quartz;
   using Quartz.Impl;
   
   namespace SchedulerApp
   {
       // Custom job implementation
       public class TimeLoggerTask : IJob
       {
           public Task Execute(IJobExecutionContext context)
           {
               Console.WriteLine($"Current timestamp: {DateTime.Now:HH:mm:ss}");
               return Task.CompletedTask;
           }
       }
   
       class Program
       {
           static async Task Main(string[] args)
           {
               // Initialize the scheduler factory
               var schedulerFactory = new StdSchedulerFactory();
               var schedulerInstance = await schedulerFactory.GetScheduler();
   
               // Begin the scheduling process
               await schedulerInstance.Start();
   
               // Define the job details
               var jobDetail = JobBuilder.Create<TimeLoggerTask>()
                   .WithIdentity("logTimeJob", "systemGroup")
                   .Build();
   
               // Configure the trigger to run immediately and repeat
               var jobTrigger = TriggerBuilder.Create()
                   .WithIdentity("timeTrigger", "systemGroup")
                   .StartNow()
                   .WithSimpleSchedule(schedule => schedule
                       .WithIntervalInSeconds(5)
                       .RepeatForever())
                   .Build();
   
               // Associate job and trigger
               await schedulerInstance.ScheduleJob(jobDetail, jobTrigger);
   
               Console.WriteLine("Scheduler is running. Press any key to stop...");
               Console.ReadKey();
   
               // Gracefully stop the scheduler
               await schedulerInstance.Shutdown();
           }
       }
   }
   

4. Execute the application:

   dotnet run
   

The console will display the current time every 5 seconds. You can modify the TimeLoggerTask logic or adjust the WithIntervalInSeconds value to change the execution frequency or behavoir.