绑定ToConstant并调用InSingletonScope是多余的？

Question

好吧,这个问题很简单地用标题来说明.

对于局部变量factory:

var factory = Fluently.Configure()
...

这两行是否相同:

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

和:

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

Answer 1

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,InSingletonScope()示例中的部分是多余的.从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;
    }