System.TypeLoadException

Question

嗨，我在C#中完成了来自TCP/IP套接字的练习，并经历了一个失败，我不知道该如何处理。下面的示例是使用自定义调度程序的客户端。当我试图加载包含实现的程序集时，下面的异常将被抛出。

namespace TcpEchoServerThreadFactory
{
    class TcpEchoServerThreadFactory
    {
        static void Main(string[] args)
        {
            if (args.Length != 3)
                throw new ArgumentException("Parameter(s): [optional properties]" + 
                    "<port> <protocol> <dispatcher>");

            int port = Int32.Parse(args[0]);
            string protocolName = args[1];
            string dispatcherName = args[2];

            TcpListener listener = new TcpListener(IPAddress.Any, port);
            listener.Start();
            ILogger logger = new ConsoleLogger();

            System.Runtime.Remoting.ObjectHandle objHandle = Activator.CreateInstance("TcpEchoThreadServerLib", protocolName + "ProtocolFactory");
            IProtocolFactory protocolFactory = (IProtocolFactory)objHandle.Unwrap();
            objHandle = Activator.CreateInstance("TcpEchoThreadServerLib", dispatcherName + "Dispatcher");
            IDispatcher dispatcher = (IDispatcher)objHandle.Unwrap();

            dispatcher.startDispatching(listener, logger, protocolFactory);
        }
    }
}

Unhandled Exception: System.TypeLoadException: Could not load type 'EchoProtocolFactory' from assembly 'TcpEchoThreadServerLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=
null'.
   at System.Reflection.RuntimeAssembly.GetType(RuntimeAssembly assembly, String name, Boolean throwOnError, Boolean ignoreCase, ObjectHandleOnStack type)
   at System.Reflection.RuntimeAssembly.GetType(String name, Boolean throwOnError, Boolean ignoreCase)
   at System.Activator.CreateInstance(String assemblyString, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Ob
ject[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark)
   at System.Activator.CreateInstance(String assemblyName, String typeName)
   at TcpEchoServerThreadFactory.TcpEchoServerThreadFactory.Main(String[] args) in C:\microsoft_press\DemoProjects\NonBlocking\TcpEchoServerThreadFactory\TcpEchoServerThreadFact
ory.cs:line 25

Answer 1

按照Hans的建议，我用命名空间对类型进行了限定，现在代码按预期的方式工作。

  string ns = "TcpEchoThreadServerLibrary.";

            TcpListener listener = new TcpListener(IPAddress.Any, port);
            listener.Start();
            ILogger logger = new ConsoleLogger();

            System.Runtime.Remoting.ObjectHandle objHandle =
                Activator.CreateInstance("TcpEchoThreadServerLib", ns + protocolName + "ProtocolFactory");
            IProtocolFactory protocolFactory = (IProtocolFactory)objHandle.Unwrap();

            objHandle = Activator.CreateInstance("TcpEchoThreadServerLib", ns + dispatcherName + "Dispatcher");
            IDispatcher dispatcher = (IDispatcher)objHandle.Unwrap();

            dispatcher.startDispatching(listener, logger, protocolFactory);