无参数构造函数错误

本文关键字:错误 构造函数 参数 | 更新日期: 2023-09-27 17:58:51

我正试图让我的客户端订阅服务器上发生的事件。

我有一个看起来像这样的界面:

public delegate void RemoteEventHandler(object sender, ClientEventArgs args);

[Serializable]
public class ClientEventArgs : EventArgs
{
    public ClientEventArgs()
    { }
    public ClientEventArgs(Client _client)
    {
        MyClient = _client;
    }
    public Client MyClient { get; set; }
}
public interface IMonitor
{
    event RemoteEventHandler RemoteEvent;
}

我的服务器类如下:

public class ConnectionManager : MarshalByRefObject, IMonitor
{
    public event RemoteEventHandler RemoteEvent;
    // call the below code when th event should fire.
     if (RemoteEvent != null)
            RemoteEvent(this, new ClientEventArgs(e.MyClient));
}

然后为了在服务器上设置我的频道,我这样做:

BinaryServerFormatterSinkProvider provider = new BinaryServerFormatterSinkProvider();
provider.TypeFilterLevel = TypeFilterLevel.Full;
IDictionary props = new Hashtable();
props["port"] = 5001;
TcpChannel channel = new TcpChannel(props, null, provider);
ChannelServices.RegisterChannel(channel, false);
RemotingConfiguration.RegisterWellKnownServiceType(
typeof(ConnectionManager),
ConnectionManager",
WellKnownObjectMode.Singleton);

在客户端上设置频道并订阅事件:

TcpChannel channel = new TcpChannel();
        ChannelServices.RegisterChannel(channel, false);
        _monitorObject = (IMonitor)Activator.GetObject(
            typeof(IMonitor),
            "tcp://localhost:5001/ConnectionManager");
_monitorObject.RemoteEvent += _monitorObject_RemoteEvent;

有人能解释一下哪里出了问题吗?

例外:

System.MissingMethodException未经处理HResult=-214623069消息=未为此对象定义无参数构造函数
来源=mscorlib

无参数构造函数错误

要回答您的最后一个问题:当使用Serializable时,您需要一个没有参数的构造函数。所以这个肯定会失败:

[Serializable]
public class ClientEventArgs : EventArgs
{
    public ClientEventArgs(Client _client)
    {
        MyClient = _client;
    }
    public Client MyClient { get; set; }
}

您需要添加一个无参数构造函数:

[Serializable]
public class ClientEventArgs : EventArgs
{
    public ClientEventArgs()
    { }
    public ClientEventArgs(Client _client)
    {
        MyClient = _client;
    }
    public Client MyClient { get; set; }
}

我的钱花在没有默认/无参数构造函数的ConnectionManager类上。远程处理基础结构需要能够在服务器端创建它的实例。