Exception thrown: 'System.InvalidOperationException' in Microsoft.Extensions.DependencyInjection - azure

Question

I am doing the webjobs using ASP.NET Core. I'm not able to set the dependency injection properly.
public static async Task Main(string[] args)
{
var host = BuildHost(args);
using (host)
{
await host.RunAsync();
}
}
public static IHost BuildHost(string[] args) =>
new HostBuilder()
.ConfigureHostConfiguration(builder =>
{
builder
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json")
.AddEnvironmentVariables();
})
.ConfigureWebJobs(b =>
{
b.AddAzureStorageCoreServices();
b.AddAzureStorage();
b.AddTimers();
})
.ConfigureServices((hostBuilderContext, services) =>
{
services.AddScoped<ISchedularService, SchedularService>();
//services.AddSingleton<IHostedService, PrintTimeService>()
}).Build();
And in the functions.cs file, I have accessed the scheduler service in the constructor. but it didn't fire the constructor and throws an exception like:
Exception thrown: 'System.InvalidOperationException' in Microsoft.Extensions.DependencyInjection
public class Functions
{
private readonly ISchedularService _schedularService;
public Functions(SchedularService schedularService)
{
_schedularService = schedularService;
}
}

Answer 1

Please make sure you're using the latest packages. I used your code with latest packages, and it works well.
I didn't use the async method.
static void Main(string[] args)
{
var host = BuildHost(args);
using (host)
{
host.Run();
}
}
public static IHost BuildHost(string[] args) =>
new HostBuilder()
.ConfigureHostConfiguration(builder =>
{
builder.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json")
.AddEnvironmentVariables();
})
.ConfigureWebJobs(b =>
{
b.AddAzureStorageCoreServices();
b.AddAzureStorage();
b.AddTimers();
})
.ConfigureServices((hostBuilderContext, services) =>
{
services.AddScoped<IWebJobConfiguration,WebJobConfiguration>();
})
.Build();
In Functions.cs:
private readonly IWebJobConfiguration _webJobConfiguration;
public Functions(IWebJobConfiguration webJobConfiguration)
{
Console.WriteLine("*** DI via constructor ***");
_webJobConfiguration = webJobConfiguration;
}
public void ProcessQueueMessage([QueueTrigger("queue111")] string message, ILogger logger)
{
Console.WriteLine(_webJobConfiguration.Message);
Console.WriteLine(message + ";consoleqqqq");
}
The result:

Answer 2

DependencyInjection problems generally occur when the wrong interface added to services. I encountered a similar problem and my code just works in .Net Core 2.x and does not work on .Net Core 3.x.
Probably there are more controls in interfaces in 3.x.
Those 2 same injections work together in 2.x but not in 3.x
services.AddScoped<IHttpClientFactory, HttpClientFactory>();
services.AddSingleton<IHttpClientFactory>(new HttpClientFactory(
Configuration["PortalLogin:Adress"],
LoginApiUserName,
LoginApiPassword));