CODEWITHSUNDEEP
c#asp.net-core
Stefan Hansch
Stefan Hansch

Reputation: 1590

How inject Logger in custom service

I have ImportExportService.

In StartUp class in method ConfigureServices I use it as 

services.AddImportExportService(Configuration.GetConnectionString("DefaultConnection"));

Extential method AddImportExportService:

public static class IServiceCollectionExtension
    {
        public static IServiceCollection AddImportExportService(this IServiceCollection services, 
            string connString,
            ILogger<ImportExportService> logger
            )
        {
            services.AddTransient<IImportExportService, ImportExportService>(provider => new ImportExportService(connString));
            return services;
        }
    }

ExportImportService uses logging. I tried to inject Logging in service as param in constructor like ILoger<ImportExportService> logger, but constructor includes only one param and extension method AddImportExportService get error.

How inject Logging in ExportImportService? Thank you

Upvotes: 0

Views: 2171

Answers (1)

n0rd
n0rd

Reputation: 12610

services.AddTransient<IImportExportService, ImportExportService>(provider => new ImportExportService(connString));

should be

services
    .AddTransient<IImportExportService, ImportExportService>(
        provider => new ImportExportService(connString, provider.GetRequiredService<ILogger<ImportExportService>>()));

assuming the constructor of ImportExportService has two arguments. Then the extension needs only two arguments:

public static IServiceCollection AddImportExportService(
    this IServiceCollection services, 
    string connString)

Upvotes: 5

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