c# - 私有(private)静态依赖与私有(private)依赖

Question

  public interface ISomeDependency
  {
    void Calculate( Person person );
  }
  public class SomeDependency : ISomeDependency
  {
    void ISomeDependency.Calculate( Person person )
    {          
      person.Age = 30;
    }
  }

  public class Person
  {
    private static ISomeDependency _someDependency;
    public DateTime BirthDate { get; set; }
    public int Age { get; set; }
    public Person( ISomeDependency someDependency )
    {
      _someDependency = someDependency;
    }
    public void CalculateAge()
    {
      _someDependency.Calculate( this );
    }
  }
  public class Client
  {
    public Client()
    {
      Person p = new Person( new SomeDependency() );
      p.BirthDate = DateTime.Now.AddYears( -30 );
      p.CalculateAge();
    }
  }

为什么依赖项是否是静态的很重要？一般来说，这重要吗？

Answer 1

Why would it matter if the dependency is static or not? In general, does it matter?

是的 - 在您的情况下，您有一个重置静态成员的实例构造函数，因此静态成员的值将是最后一个构造函数被赋予的值。

因为没有理由将我可以看到的依赖项设置为静态(您没有使用它的静态方法/属性)它应该是一个实例(非静态)字段。