Worker Service Templete dosen't work at .net 8.0

[sangeun-jo]

Type of issue

Code doesn't work

Description

Problem 1

using App.WorkerService;

var builder = Host.CreateDefaultBuilder(args); // no CreateApplicationBuilder extension at .net 8.0

builder.Services.AddHostedService<Worker>(); // no AddHostedService extension at .net 8.0

IHost host = builder.Build();
host.Run();

The code above should be changed:

using App.WorkerService;

var builder = Host.CreateDefaultBuilder(args);
builder.ConfigureServices((hostContext, services) =>
{
    services.AddHostedService<Worker>();
});

var host = builder.Build();
host.Run();

Problem 2

using App.QueueService;

HostApplicationBuilder builder = Host.CreateApplicationBuilder(args);
builder.Services.AddSingleton<MonitorLoop>();
builder.Services.AddHostedService<QueuedHostedService>();
builder.Services.AddSingleton<IBackgroundTaskQueue>(_ => 
{
    if (!int.TryParse(builder.Configuration["QueueCapacity"], out var queueCapacity))
    {
        queueCapacity = 100;
    }

    return new DefaultBackgroundTaskQueue(queueCapacity);
});

IHost host = builder.Build();

MonitorLoop monitorLoop = host.Services.GetRequiredService<MonitorLoop>()!;
monitorLoop.StartMonitorLoop();

host.Run();

The code above also should be changed:

using App.QueueService;
var builder = Host.CreateDefaultBuilder(args);
builder.ConfigureServices((hostContext, services) =>
{
    services.AddSingleton<MonitorLoop>();
    services.AddHostedService<QueuedHostedService>();
    services.AddSingleton<IBackgroundTaskQueue>(_ => 
    {
        if (!int.TryParse(hostContext.Configuration["QueueCapacity"], out var queueCapacity))
        {
            queueCapacity = 100;
        }

        return new DefaultBackgroundTaskQueue(queueCapacity);
    });
});


IHost host = builder.Build();

MonitorLoop monitorLoop = host.Services.GetRequiredService<MonitorLoop>()!;
monitorLoop.StartMonitorLoop();

host.Run();

I've only installed Microsoft.Extensions.Hosting package.
Please let me know if I need install other package to get extensions: CreateApplicationBuilder, AddHostedService

Page URL

https://learn.microsoft.com/ko-kr/dotnet/core/extensions/workers#template-defaults

Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/extensions/workers.md

Document Version Independent Id

ff379d26-0d85-6d74-67da-4a3cd260b04d

Article author

@IEvangelist

Metadata

• ID: ae847f16-ff74-ab68-7163-f713b447430c
• Service: dotnet-fundamentals

[sangeun-jo]

I've installed Microsoft.Extensions.Hosting.WindowsServices 8.0.0 and solved the problem.