Ninject在构造函数中传递引用

时间:2017-10-20 08:54:07

标签: c# design-patterns dependency-injection constructor ninject

我是一个依赖注入的菜鸟,我按照教程并重构了我的代码以使用Ninject。这就是我所拥有的(简化)。 Bindings.cs

 public class Bindings : NinjectModule
    {
        public override void Load()
        {
            Bind<IConnectionToModbusCreator>().To<ConnectionToModbusCreator>();
            Bind<IInputProcessor>().To<InputProcessor>();
}}

Program.cs;

static class Program
    {
        [STAThread]
        static void Main()
        {
            var kernel = new StandardKernel();
            kernel.Load(Assembly.GetExecutingAssembly());
            var InputProcessor = kernel.Get<IInputProcessor>();

        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1(InputProcessor));
}

这个启动一个表单,用户通过单击按钮启动程序,这里是Form1:

    public partial class Form1 : Form
    {
        private readonly IInputProcessor _inputProcessor;

        public Form1(IInputProcessor inputProcessor)
        {            _inputProcessor = inputProcessor;
            InitializeComponent();
        }
        private void Test_Click_1(object sender, EventArgs e)
        {
  ISequenceController sequenceController = new SequenceController( _inputProcessor)
            sequenceController.StartSequence();
        }

我的问题是:

这是最好的方法吗?我担心我必须在构造函数中传递的所有引用,我试图使用一个类Container,它保存变量与实例化的对象并将它们用作属性但我无法在任何Ninject手册中找到sich方法。

1 个答案:

答案 0 :(得分:0)

您的程序遵循构造函数注入DI模式,这是一种很好的做法,但它有一些问题会引入模块之间的耦合。拨打new的大量电话会提醒您。

  • Program不应该了解IInputProcessor。这是Form1
  • 的依赖关系
  • Form1不应该了解IInputProcessor。它是SequenceController
  • 的依赖关系
  • Form1不应该知道SequenceController,它应该只知道它的抽象,ISequenceController

这可以通过更好地使用构造函数注入来获得更少的耦合代码来解决:

public class Bindings : NinjectModule
    {
        public override void Load()
        {
            Bind<IConnectionToModbusCreator>().To<ConnectionToModbusCreator>();
            Bind<IInputProcessor>().To<InputProcessor>();
            Bind<ISequenceController>().To<SequenceController>();
            Bind<Form1>().ToSelf(); // in fact useless unless you add a scope, like .InSingletonScope()
        }
}

static class Program
    {
        [STAThread]
        static void Main()
        {
            var kernel = new StandardKernel();
            kernel.Load(Assembly.GetExecutingAssembly());

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            var form1= kernel.Get<Form1>();
            Application.Run(form1);
}

public partial class Form1 : Form
{
    private readonly ISequenceController _sequenceController;

    public Form1(ISequenceController sequenceController)
    {            
        _sequenceController = sequenceController;
        InitializeComponent();
    }

    private void Test_Click_1(object sender, EventArgs e)
    {
        _sequenceController.StartSequence();
    }