Question

我在使用Castle DynamicProxy v1.1.5.0使用参数代理metod时遇到问题。 - 我得到异常“索引超出了数组的范围。”

如果我只使用没有参数的方法，或者使用DynamicProxy v2，一切正常不幸的是，我无法说服我的项目上的线索向v2添加依赖项（我们已经在使用v1，因为它带有NHibernate）。

所以我的问题归结为：这可以在v1中完成吗？我使用它错了吗？

这是实质性的。

我已经实现了一种模拟继承的机制，而没有对基类的编译时依赖性。 Pleeease不问为什么，原因很难看:(

这是一个完整的例子，展示了这是如何打破的。我正在引用Castle.DynamicProxy.dll（v1）。如果我更改了对Castle.DynamicProxy [b] 2 [/ b] .dll（+ Castle.Core.dll）的引用，请在代码的开头取消注释#define。

对于长期代码感到抱歉，但我担心我可能会泄露一些重要的细节...... 另外：免责声明：代码示例有一些NASTY错误！（可能比我发现的还多：）

//#define DynamicProxyV2

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;


#if DynamicProxyV2
using Castle.Core.Interceptor;
#endif

using Castle.DynamicProxy;

namespace ProxyTest
{

    public interface IMyInterface
    {
        void Foo(object a);
        void Bar(object a);
        void Baz(object a);
    }
    public interface IParam
    {
        string Value { get;}
    }

    public class DefaultImplementation : IMyInterface{
        public virtual void Foo(object a) {
            Console.WriteLine("Default Foo");
            Bar(null);
        }

        public virtual void Bar(object a){
            Baz(null);
        }

        public virtual void Baz(object a){
            Console.WriteLine("Default Baz");
        }
    }

    class DerivedImpl : ProxyDerivedImplementation {
        public DerivedImpl(IMyInterface i_baseImpl)
            : base(i_baseImpl) { }

        public override void Foo(object a) {
            Console.WriteLine("Derived - Foo!");
            base.Bar(null);
        }

        public override void Baz(object a) {
            Console.WriteLine("Derived - Baz!");
        }
    }

    public class DoStuff {
        [STAThread]
        public static void Main()
        {
            Type t = typeof(DefaultImplementation);

            IMyInterface defaultImpl = (IMyInterface)Activator.CreateInstance(t);
            DerivedImpl derived = new DerivedImpl(defaultImpl);
            derived.Foo(null);
        }
    }


    public class ProxyDerivedImplementation : IMyInterface, IInterceptor {
        private IMyInterface m_proxy;
        public ProxyDerivedImplementation(IMyInterface i_defaultImplementation)
        {
            ProxyGenerator pg = new ProxyGenerator();

            Type tt = i_defaultImplementation.GetType();
            m_proxy = (IMyInterface)pg.CreateClassProxy(tt, this);
        }

#if DynamicProxyV2
        #region DynProxy v2
        public void Intercept(IInvocation invocation) {
            try
            {
                MethodInfo i_method = invocation.Method;
                List<Type> types = new List<Type>();

                foreach (ParameterInfo info in i_method.GetParameters())
                {
                    types.Add(info.ParameterType);
                }
                MethodInfo method = this.GetType().GetMethod(i_method.Name, types.ToArray());
                object[] attrs = method.GetCustomAttributes(typeof(NotOverridenAttribute), false);
                if (attrs.Length > 0)
                {
                    invocation.Proceed();
                }
                else
                {
                    invocation.ReturnValue = method.Invoke(this, invocation.Arguments);
                }
            }
            catch (Exception ex)
            {
                Debug.Fail(ex.Message);
                //return null;
            }

        }
        #endregion
#else
        #region DynProxy v1
        public object Intercept(IInvocation i_invocation, params object[] args) {
            try {
                MethodInfo proxiedMethod = i_invocation.Method;
                List<Type> types = new List<Type>();

                foreach (ParameterInfo info in proxiedMethod.GetParameters())
                {
                    types.Add(info.ParameterType);
                }

                //find the corresponding method in the inheritance tree having this class as root
                MethodInfo localMethod = this.GetType().GetMethod(proxiedMethod.Name, types.ToArray());
                object[] attrs = localMethod.GetCustomAttributes(typeof(NotOverridenAttribute), false);
                if (attrs.Length > 0)
                {
                    //it's one of the methods in THIS class, i.e. it's not overridden
                    //-> we can't call the method in this class, because it will re-trigger this intercept
                    //   and we'd get an infinite loop
                    // => just dispatch the method to the original proxied type
                    //
                    return i_invocation.Proceed();
                }
                //else we have an override for this method - call it.
                return localMethod.Invoke(this, args);
            } catch (Exception ex) {
                Debug.Fail(ex.Message);
                return null;
            }
        }
        #endregion
#endif
        [NotOverriden]
        public virtual void Foo(object a) { m_proxy.Foo(a); }

        [NotOverriden]
        public virtual void Bar(object a) { m_proxy.Bar(a); }

        [NotOverriden]
        public virtual void Baz(object a) { m_proxy.Baz(a); }
    }

    class NotOverridenAttribute : Attribute { }

}

呼！那是满口的。这是使用v1时发生的异常：

{"Index was outside the bounds of the array."}
    [System.IndexOutOfRangeException]: {"Index was outside the bounds of the array."}
    Data: {System.Collections.ListDictionaryInternal}
    HelpLink: null
    InnerException: null
    Message: "Index was outside the bounds of the array."
    Source: "DynamicAssemblyProxyGen"
    StackTrace: "   at CProxyTypeDefaultImplementationProxyTest0.__delegate_2.Call(Object[] )\r\n   at Castle.DynamicProxy.Invocation.AbstractInvocation.Proceed(Object[] args)\r\n   at ProxyTest.ProxyDerivedImplementation.Intercept(IInvocation i_invocation, Object[] args) in D:\\My Documents\\Visual Studio 2005\\Projects\\DefaultImpl\\AddedValue\\AddedValue.cs:line 133"
    TargetSite: {System.Object Call(System.Object[])}

使用v2运行时，我得到的是正确的输出：

派生 - Foo！派生 - 巴兹！

...帮助？

Answer 1

不要使用旧的DynamicProxy。它长期不受支持。如果你正在使用它附带的NHibernate，我甚至不想问你正在使用哪个版本的NHibernate。 DPv1 真的旧

当使用参数代理方法时，Castle DynamicProxy v1异常？

1 个答案: