Run Nopcommerce on console application - asp.net-mvc

Question

I want to use NopCommerce libraries for a console project (for migrate data transfer).
I create a console project and add the base libraries (Nop.Core, Nop.Data, Nop.Service, Nop.Web.Freamework) to it, I also copy the App_Data folder.
I also use Class Startup.cs to run the project
namespace Nop.Console
{
class Program
{
static void Main(string[] args)
{
using var host = Host.CreateDefaultBuilder(args)
.UseServiceProviderFactory(new AutofacServiceProviderFactory())
.ConfigureWebHostDefaults(webBuilder => webBuilder
.ConfigureAppConfiguration(config =>
{
config
.AddJsonFile(NopConfigurationDefaults.AppSettingsFilePath, true, true)
.AddEnvironmentVariables();
})
.UseStartup<Startup>())
.Build();
var engine = EngineContext.Create();
var cs = engine.Resolve<ICategoryService>();
System.Console.WriteLine("Hello World!");
}
}
}
But engine.Resolve(); return null;
Any idea?

Answer 1

I'm not 100% sure if this is the best solution, but at least works for me for NopCommerce 4.40.4. The code in my Console application is following:
/// <summary>
/// EngineContextInitializer
/// </summary>
public static class EngineContextInitializer
{
/// <summary>
/// Runs this instance.
/// </summary>
public static async Task<IHost> RunAsync()
{
string[] args = Array.Empty<string>();
var host = Host.CreateDefaultBuilder(args)
.UseServiceProviderFactory(new AutofacServiceProviderFactory())
.ConfigureWebHostDefaults(webBuilder => webBuilder
.ConfigureAppConfiguration(config =>
{
config
.AddJsonFile(NopConfigurationDefaults.AppSettingsFilePath, true, true)
.AddEnvironmentVariables();
})
.UseStartup<Startup>())
.Build();
//start the program, a task will be completed when the host starts
await host.StartAsync();
return host;
}
}
The usage of EngineContextInitializer is following:
private async Task GetProductById(int id)
{
using var host = await EngineContextInitializer.RunAsync();
IEngine engine = EngineContext.Current;
var productService = engine.Resolve<IProductService>();
var product = await productService.GetProductByIdAsync(id);
await host.StopAsync();
}
So what does make the difference between your and mine code?
I'm running the code:
await host.StartAsync();
Most importantly I'm disposing IHost after I got the product from IProductService.
On the line is the difference:
var host = Host.CreateDefaultBuilder(args)
And 1 more thing, you don't need to call EngineContext.Create(), because if you check the class and Current getter you will see the following code:
/// <summary>
/// Gets the singleton Nop engine used to access Nop services.
/// </summary>
public static IEngine Current
{
get
{
if (Singleton<IEngine>.Instance == null)
{
Create();
}
return Singleton<IEngine>.Instance;
}
}
Please don't forget to dispose IHost as it implements IDisposable to avoid memory leaks.
Disclaimer: I'm not part of NopCommerce dev team, usage is at your own risk. Please follow official NopCommerce documentation or response on the topic on their website (documentation, forum or GitHub).