Create Task Scheduler

Question

How to create Task Scheduler. Step-by-step process. what files should we create

Vinay Singh · Answer

Hi Subham, Plesae refer the below link this may help you https://www.c-sharpcorner.com/blogs/scheduling-in-asp-net-mvc-core

Muhammad Imran Ansari · Answer

Hi Shubham, Creating a Task Scheduler in Windows to run a .NET Core application involves several steps. Below is a step-by-step guide to help you set it up: Step 1: Create a .NET Core Application 1. Install .NET Core SDK: Ensure you have the .NET Core SDK installed on your machine. You can download it from the [official .NET website](https://dotnet.microsoft.com/download). 2. Create a New .NET Core Project : - Open a command prompt or terminal. - Run the following command to create a new console application: dotnet new console -n MyScheduledTask - Navigate to the project directory: cd MyScheduledTask 3. Build the Project: - Run the following command to build the project: dotnet build 4. Publish the Project: - Publish the project to create a self-contained executable: dotnet publish -c Release -r win-x64 --self-contained - The published files will be located in the `bin/Release/netX.X/win-x64/publish` directory (replace `netX.X` with the appropriate .NET Core version). Step 2: Create a Batch File to Run the .NET Core Application 1. Create a Batch File: - Create a new text file in the publish directory and name it `RunMyScheduledTask.bat`. - Open the batch file in a text editor and add the following content: @echo off cd /d "%~dp0" MyScheduledTask.exe - Save and close the file. Step 3: Set Up Task Scheduler 1. Open Task Scheduler: - Press `Win + R`, type `taskschd.msc`, and press Enter to open the Task Scheduler. 2. Create a New Task: - In the Task Scheduler, click on "Create Task" in the right-hand pane. 3. General Tab: - Enter a name for the task (e.g., "RunMyScheduledTask"). - Optionally, provide a description. - Select "Run whether user is logged on or not" and check "Do not store password". 4. Triggers Tab: - Click on "New..." to create a new trigger. - Set the trigger to your desired schedule (e.g., daily, weekly, at startup, etc.). - Configure the start date, time, and recurrence as needed. - Click "OK" to save the trigger. 5. Actions Tab: - Click on "New..." to create a new action. - Set "Action" to "Start a program". - In the "Program/script" field, browse to the `RunMyScheduledTask.bat` file you created earlier. - In the "Start in" field, enter the path to the directory containing the batch file (e.g., `C:\path	o\publish\directory`). - Click "OK" to save the action. 6. Conditions Tab: - Configure any additional conditions if needed (e.g., start the task only if the computer is idle). 7. Settings Tab: - Configure any additional settings if needed (e.g., allow the task to be run on demand, stop the task if it runs longer than a specified time, etc.). 8. Save the Task: - Click "OK" to save the task. Step 4: Test the Task 1. Run the Task Manually: - In the Task Scheduler, find your task in the list, right-click it, and select "Run" to test it. - Check the output or logs to ensure the task runs as expected. 2. Check for Errors: - If the task does not run as expected, check the "Last Run Result" in the Task Scheduler and review any error messages. Files to Create - . NET Core Application: The main executable and associated DLLs. - Batch File (`RunMyScheduledTask.bat`): A script to run the .NET Core application. By following these steps, you can successfully create a Task Scheduler task to run your .NET Core application on a specified schedule.

Tuhin Paul · Answer

Part -3 HLD overview:

Tuhin Paul · Answer

Part -2 Services/TaskRunnerService.cs public class TaskRunnerService { private readonly DatabaseContext _dbContext; private readonly IHttpClientFactory _httpClientFactory; private readonly ILogger _logger; public TaskRunnerService( DatabaseContext dbContext, IHttpClientFactory httpClientFactory, ILogger logger) { _dbContext = dbContext; _httpClientFactory = httpClientFactory; _logger = logger; } public async Task ExecuteTaskAsync(ScheduledTask task) { var history = new ExecutionHistory { TaskId = task.Id, StartTime = DateTime.UtcNow, Status = "Running" }; try { await _dbContext.ExecutionHistory.AddAsync(history); await _dbContext.SaveChangesAsync(); switch (task.TaskType.ToUpper()) { case "HTTP": await ExecuteHttpTask(task); break; case "SQL": await ExecuteSqlTask(task); break; case "EXE": ExecuteExeTask(task); break; } history.Status = "Success"; history.EndTime = DateTime.UtcNow; } catch (Exception ex) { history.Status = "Failed"; history.Output = ex.ToString(); _logger.LogError(ex, $"Task {task.TaskName} failed"); } finally { task.LastRunTime = DateTime.UtcNow; task.NextRunTime = CalculateNextRun(task.ScheduleCron); await _dbContext.SaveChangesAsync(); } } private async Task ExecuteHttpTask(ScheduledTask task) { var config = JsonSerializer.Deserialize (task.Configuration); var client = _httpClientFactory.CreateClient(); var response = await client.SendAsync(new HttpRequestMessage( new HttpMethod(config.Method), config.Url )); response.EnsureSuccessStatusCode(); } private DateTime CalculateNextRun(string cronExpression) { var schedule = CronExpression.Parse(cronExpression); return schedule.GetNextOccurrence(DateTime.UtcNow) ?? DateTime.UtcNow.AddHours(1); } } Program.cs var builder = Host.CreateApplicationBuilder(args); builder.Services.AddDbContext (options => options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection"))); builder.Services.AddHttpClient(); builder.Services.AddHostedService (); builder.Services.AddScoped (); var host = builder.Build(); host.Run(); appsettings.json { "ConnectionStrings": { "DefaultConnection": "Server=.;Database=TaskScheduler;Trusted_Connection=True;" }, "Logging": { "LogLevel": { "Default": "Information", "Microsoft.Hosting.Lifetime": "Information" } } } Cron Schedule Support : Uses Cronos package for cron expressions Task Types : Supports HTTP, SQL, and EXE tasks Error Handling : Detailed execution history with error logs Thread Safety : Proper scoping with DI containers Configuration : JSON-based configuration for different task types Install required packages: dotnet add package Microsoft.EntityFrameworkCore.SqlServer dotnet add package Cronos dotnet add package Microsoft.Extensions.Http Create database using EF Core migrations: dotnet ef migrations add InitialCreate dotnet ef database update Create sample task: var task = new ScheduledTask { TaskName = "Daily Cleanup", TaskType = "HTTP", ScheduleCron = "0 2 * * *", // Daily at 2 AM Configuration = JsonSerializer.Serialize(new HttpTaskConfig { Url = "https://api.example.com/cleanup", Method = "POST" }) };

Tuhin Paul · Answer

Part -1 Create these files in your .NET project: - TaskScheduler/ +-- Models/ ¦ +-- ScheduledTask.cs ¦ +-- ExecutionHistory.cs +-- Services/ ¦ +-- ITaskSchedulerService.cs ¦ +-- TaskSchedulerService.cs ¦ +-- TaskRunnerService.cs ¦ +-- DatabaseContext.cs +-- Workers/ ¦ +-- TaskSchedulerWorker.cs +-- appsettings.json Create these tables: CREATE TABLE ScheduledTasks ( Id INT PRIMARY KEY IDENTITY(1,1), TaskName NVARCHAR(100) NOT NULL, TaskType NVARCHAR(50) NOT NULL, -- HTTP, SQL, EXE ScheduleCron NVARCHAR(50) NOT NULL, IsEnabled BIT NOT NULL DEFAULT 1, LastRunTime DATETIME, NextRunTime DATETIME, Configuration NVARCHAR(MAX) -- JSON config ); CREATE TABLE ExecutionHistory ( Id INT PRIMARY KEY IDENTITY(1,1), TaskId INT FOREIGN KEY REFERENCES ScheduledTasks(Id), StartTime DATETIME NOT NULL, EndTime DATETIME, Status NVARCHAR(20) NOT NULL, Output NVARCHAR(MAX) ); Models/ScheduledTask.cs public class ScheduledTask { public int Id { get; set; } public string TaskName { get; set; } public string TaskType { get; set; } public string ScheduleCron { get; set; } public bool IsEnabled { get; set; } public DateTime? LastRunTime { get; set; } public DateTime? NextRunTime { get; set; } public string Configuration { get; set; } // JSON config } Models/ExecutionHistory.cs public class ExecutionHistory { public int Id { get; set; } public int TaskId { get; set; } public DateTime StartTime { get; set; } public DateTime? EndTime { get; set; } public string Status { get; set; } // Success, Failed, Running public string Output { get; set; } } Services/DatabaseContext.cs public class DatabaseContext : DbContext { public DatabaseContext(DbContextOptions options) : base(options) { } public DbSet ScheduledTasks { get; set; } public DbSet ExecutionHistory { get; set; } } Services/TaskSchedulerService.cs public class TaskSchedulerService : BackgroundService { private readonly ILogger _logger; private readonly IServiceProvider _services; private readonly PeriodicTimer _timer = new(TimeSpan.FromMinutes(1)); public TaskSchedulerService( ILogger logger, IServiceProvider services) { _logger = logger; _services = services; } protected override async Task ExecuteAsync(CancellationToken stoppingToken) { while (await _timer.WaitForNextTickAsync(stoppingToken)) { using var scope = _services.CreateScope(); var dbContext = scope.ServiceProvider.GetRequiredService (); var taskRunner = scope.ServiceProvider.GetRequiredService (); var dueTasks = await dbContext.ScheduledTasks .Where(t => t.IsEnabled && t.NextRunTime

Satya Karki · Answer

Hi, You can use hangfire or Quartz.NET for .NET application. You can follow the article: https://www.csharp.com/article/scheduling-background-jobs-in-asp-net-core-using-quartz-net/

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