Question

在我的CLI Main中，我需要一个MonDbBusinessComponent类的对象。我写了下面的代码，但我的对象仍然为空。怎么了？怎么做对呢？

public static IMonDbBusinessComponent monDbBusinessComponent { get; set; }
static void Main(string[] args)
{
    var collection = new ServiceCollection();
    collection.AddScoped<IMonDbRepository, MonDbRepository>();
    ServiceProvider appServiceProvider = GetServiceProvider();
    monDbBusinessComponent = appServiceProvider.GetService<IMonDbBusinessComponent>();

Answer 1

您从未注册过IMonDbBusinessComponent。

collection.AddScoped<IMonDbBusinessComponent, MonDbBusinessComponent>();

Answer 2

很抱歉，在我发布的代码中看不到。 BusinessComponent使用存储库，首先我需要使用其参数注册存储库，然后注册BusinessComponent。同样在BusinessComonent，我需要使用Interface而不是class。

public MonDbBusinessComponent(IMonDbRepository monDbRepository){...}

collection.AddScoped<IMonDbRepository>(ServiceProvider =>
{
    string createMetaDataRecordFunctionName = Configurations.Get(LocalConfiguration, "CreateMetaDataRecordFunctionName");
    string conDbDataRecordFunctionName = Configurations.Get(LocalConfiguration, "ConDbDataRecordFunctionName");
    return new MonDbRepository(metaDataConnection, createMetaDataRecordFunctionName, conDbDataRecordFunctionName);
});
collection.AddScoped<IMonDbBusinessComponent, MonDbBusinessComponent>();

感谢所有支持！

CLI Main中的依赖注入，对象为null

2 个答案: