绑定 ToConstant 和调用 InSingletonScope 是多余的吗？

发布于 2024-12-04 09:05:29 字数 329 浏览 3 评论 0原文

嗯，这个问题从标题就已经很简单地说明了。

对于局部变量factory：

var factory = Fluently.Configure()
...

这两行是否等效：

Bind<ISessionFactory>().ToConstant(factory).InSingletonScope();

和：

Bind<ISessionFactory>().ToConstant(factory);

原文

Well, this question is pretty simply stated by the title.

For a local variable factory:

var factory = Fluently.Configure()
...

Are these two lines equivalent:

Bind<ISessionFactory>().ToConstant(factory).InSingletonScope();

and:

Bind<ISessionFactory>().ToConstant(factory);

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亢潮 2024-12-11 09:05:29

在最新版本的 ninject 中，当您创建 ToConstant 绑定时，它会自动将 Scope 设置为 Singleton。因此，示例中的 InSingletonScope() 部分是多余的。来自 ninject 代码库：

    /// <summary>
    /// Indicates that the service should be bound to the specified constant value.
    /// </summary>
    /// <param name="value">The constant value.</param>
    public IBindingWhenInNamedWithOrOnSyntax<T> ToConstant(T value)
    {
        Binding.ProviderCallback = ctx => new ConstantProvider<T>(value);
        Binding.Target = BindingTarget.Constant;
        Binding.ScopeCallback = StandardScopeCallbacks.Singleton;

        return this;
    }

In the latest version of ninject, when you create a ToConstant binding it will automatically set the Scope to Singleton. Thus, the InSingletonScope() part in your example is redundant. From ninject code base:

    /// <summary>
    /// Indicates that the service should be bound to the specified constant value.
    /// </summary>
    /// <param name="value">The constant value.</param>
    public IBindingWhenInNamedWithOrOnSyntax<T> ToConstant(T value)
    {
        Binding.ProviderCallback = ctx => new ConstantProvider<T>(value);
        Binding.Target = BindingTarget.Constant;
        Binding.ScopeCallback = StandardScopeCallbacks.Singleton;

        return this;
    }

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