target - 城堡动态代理2 : Get the Target inside an Interceptor?

Question

我正在使用 CaSTLe DynamicProxy2“附加”接口(interface)以从字典中检索字段。例如，给定以下类:

public class DataContainer : IDataContainer
{
    private Dictionary<string, object> _Fields = null;

    public Dictionary<string, object> Data
    {
        get { return _Fields ?? (_Fields = new Dictionary<string, object>()); }
    }
}

我想使用以下接口(interface)作为接口(interface)代理来从 Fields 字典中提取“Name”值:

public interface IContrivedExample
{
    string Name { get; }
}

从拦截器中，我想获取“目标”DataContainer，并返回“Name”值:

public void Intercept(IInvocation invocation)
{
    object fieldName = omitted; // get field name based on invocation information

    DataContainer container = ???; // this is what I'm trying to figure out
    invocation.ReturnValue = container.Fields[fieldName];
}

// Somewhere in code
var c = new DataContainer();
c.Fields.Add("Name", "Jordan");

var pg = new ProxyGenerator();
IContrivedExample ice = (IContrivedExample) pg.CreateInterfaceProxyWithTarget(..., c, ...);
Debug.Assert(ice.Name == "Jordan");

关于如何获得潜在目标的任何想法

注意:这是一个人为的示例，我用它来围绕我的问题建立一些上下文。

Answer 1

我明白了。您必须将代理强制转换为 IProxyTargetAccessor:

public void Intercept(IInvocation invocation)
{
    object fieldName = omitted; // get field name based on invocation information

    var accessor = invocation.Proxy as IProxyTargetAccessor;

    DataContainer container = (DataContainer) accessor.DynProxyGetTarget();
    invocation.ReturnValue = container.Fields[fieldName];
}