我收到以下错误:
test.Services.JobService' does not contain a constructor that takes 0 arguments.
这是代码:
工作服务.cs:
namespace TesteUltrafan.Services
{
public class JobService
{
private readonly IRepository _repository;
public JobService(IRepository repository)
{
_repository = repository;
}
public Job CreateJobBanker()
{
var banker = new Job();
string id = Guid.NewGuid().ToString("N");
Console.WriteLine("Novo job banker id: {0}", id);
banker.Id = id;
banker.Type = JobType.Banker;
banker.CreatedAt = DateTime.Now;
Console.WriteLine("Salvando job banker id: {0}", id);
Job jobBanker = _repository.SaveJob(banker);
return jobBanker;
}
}
}
程序.cs:
public class Program
{
public static void Main()
{
var jobService = new JobService(); <---- Here is the error.
Console.WriteLine("Creating job banker, creation:");
Job jobBanker = jobService.CreateJobBanker();
Console.WriteLine("Job banker: {0}", jobBanker);
}
}
工作.cs:
public class Job
{
public string Id { get; set; }
public DateTime CreatedAt { get; set; }
public JobType Type { get; set; }
}
工作类型.cs:
public enum JobType
{
Actor = 1,
Agricultural = 2,
Banker = 3,
EngineerCivil = 4,
Another = 5,
}
最佳答案
您要么需要在您的 JobService
类中创建一个无参数构造函数(我不会这样做,因为那样您的类将无法正常工作 - 将不会引用任何存储库)或者最好传递一个Repository 实例作为构造此实例时的参数。
所以代码最好应该是这样的:
public class Program
{
public static void Main()
{
var jobService = new JobService(new Repository());
Console.WriteLine("Creating job banker, creation:");
Job jobBanker = jobService.CreateJobBanker();
Console.WriteLine("Job banker: {0}", jobBanker);
}
}
Repository
应该是一个实现IRepository
接口(interface)的类。如果不传递此实例,您的 CreateJobBanker
将无法工作。
虽然推荐使用一些 IoC 容器,因为您的代码遵循控制反转原则(您可能甚至没有意识到这一点)。
关于c# - C# 中的接口(interface)和类,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21353755/