无法使用AUTOFAC解析名称valuecollection

Question

我正在使用AutoFac 2.1.12来处理我的依赖注入，并且在一个特定问题上遇到麻烦。我似乎无法解析名称valuecollection依赖性。

考虑以下代码段：

class Foo
{
    public Foo(NameValueCollection collection) { }
}

static class Run
{
    public static void Main()
    {
        var builder = new ContainerBuilder();
        builder.RegisterType<NameValueCollection>();
        builder.RegisterType<Foo>();

        using (var scope = builder.Build())
            scope.Resolve<Foo>();
    }
}

它将以无与伦比的依赖关系exception崩溃：

检测到的圆形组件依赖性：foo-> system.collections.specialized.namevaluecollection-> system.collections.collections.specialized.namevaluecollection。

但是，如果我用任何其他类型替换名称valuecollection，则代码正常。

我是在做一些事情，关于我所缺少的名称valuecollection类型是否有一些特别之处，或者这是AutoFac本身的问题？

Answer 1

This is by design. See Autowiring:

Autofac automatically chooses the constructor with the most parameters that are able to be obtained from the container.

Try registering NameValueCollection like so (not sure if this will work, though):

builder.RegisterType<NameValueCollection>().UsingConstructor();

If that doesn't work, try

builder.Register(c => new NameValueCollection());