使用StructureMap拦截3.*

Question

我使用Castle.DynamicProxy和StructureMap 2.6 API进行了拦截,但现在无法使用StructureMap 3.0进行拦截.谁能帮我找到更新的文档甚至演示？我发现的一切似乎都与旧版本有关.例如StructureMap.Interceptors.TypeInterceptor接口等.

Answer 1

HAHAA!我做了!这是如何做:

public class ServiceSingletonConvention : DefaultConventionScanner
{
    public override void Process(Type type, Registry registry)
    {
        base.Process(type, registry);

        if (type.IsInterface || !type.Name.ToLower().EndsWith("service")) return;

        var pluginType = FindPluginType(type);

        var delegateType = typeof(Func<,>).MakeGenericType(pluginType, pluginType);

        // Create FuncInterceptor class with generic argument +
        var d1 = typeof(FuncInterceptor<>);

        Type[] typeArgs = { pluginType };

        var interceptorType = d1.MakeGenericType(typeArgs);
        // -

        // Create lambda expression for passing it to the FuncInterceptor constructor +
        var arg = Expression.Parameter(pluginType, "x");

        var method = GetType().GetMethod("GetProxy").MakeGenericMethod(pluginType);

        // Crate method calling expression
        var methodCall = Expression.Call(method, arg);

        // Create the lambda expression
        var lambda = Expression.Lambda(delegateType, methodCall, arg);
        // -

        // Create instance of the FuncInterceptor
        var interceptor = Activator.CreateInstance(interceptorType, lambda, "");

        registry.For(pluginType).Singleton().Use(type).InterceptWith(interceptor as IInterceptor);
    }

    public static T GetProxy<T>(object service)
    {
        var proxyGeneration = new ProxyGenerator();

        var result = proxyGeneration.CreateInterfaceProxyWithTarget(
           typeof(T),
           service,
           (Castle.DynamicProxy.IInterceptor)(new MyInterceptor())
           );

        return (T)result;
    }
}

这里的问题是SM 3.*允许拦截已知类型,即执行以下操作:

expression.For<IService>().Use<Service>().InterceptWith(new FuncInterceptor<IService>(service => GetProxyFrom(service)));

但是,如果您希望在自定义扫描约定中包含拦截逻辑,并且要拦截具有特定签名的所有类型实例(在我的情况下,名称以'service'结尾的类型),该怎么办？

这就是我使用Expression API和反射完成的.

此外,我在这里使用Castle.DinamicProxy为我的服务创建代理对象.

希望别人会觉得这很有帮助:)