在解决wcf客户端问题时,我遇到了@marc-gravell here的一些代码。我多次阅读这篇文章,然后决定尝试看看我是否可以使用真正的代码,所以我创建了一个控制台应用程序并将其全部拉进去。
打包机:
public interface IDisposableWrapper<T> : IDisposable
{
T BaseObject { get; }
}
public class DisposableWrapper<T> : IDisposableWrapper<T> where T : class, IDisposable
{
public T BaseObject { get; private set; }
public DisposableWrapper(T baseObject) { BaseObject = baseObject; }
protected virtual void OnDispose()
{
BaseObject.Dispose();
}
public void Dispose()
{
if (BaseObject != null)
{
try
{
OnDispose();
}
catch
{
// swallow...
}
}
BaseObject = null;
}
}
扩展:
public static class DisposableExtensions
{
// core "just dispose it without barfing"
public static IDisposableWrapper<T> Wrap<T>(this T baseObject)
where T : class, IDisposable
{
if (baseObject is IDisposableWrapper<T>) return (IDisposableWrapper<T>)baseObject;
return new DisposableWrapper<T>(baseObject);
}
// specific handling for service-model
public static IDisposableWrapper<TProxy> Wrap<TProxy, TChannel>(this TProxy proxy)
where TProxy : ClientBase<TChannel>
where TChannel : class
{
return new ClientWrapper<TProxy, TChannel>(proxy);
}
}
ClientWrapper:
public class ClientWrapper<TProxy, TChannel> : DisposableWrapper<TProxy>
where TProxy : ClientBase<TChannel>
where TChannel : class
{
public ClientWrapper(TProxy proxy) : base(proxy)
{
}
protected override void OnDispose()
{
// lots of code per state of BaseObject
//State != CommunicationState.Faulted;
}
}
现在,当我去使用它时,我有这个:
static void Main(string[] args)
{
using (var proxy = new PLPlacementServiceClient())
{
var result = proxy.GetDocumentClassForNewBusiness();
}
using (var proxy = new PLPlacementServiceClient().Wrap())
{
var result = proxy.BaseObject.GetDocumentClassForNewBusiness();
}
using (var proxy = new PLPlacementServiceClient().Wrap<>())//what goes here?
{
var result = proxy.BaseObject.GetDocumentClassForNewBusiness();
}
}
当我F-12 PLPlacementServiceClient()。Wrap()方法时,它将我带到扩展类中的非泛型实现
IDisposableWrapper<T> Wrap<T>(this T baseObject)
,但我期待被带到另一个签名
IDisposableWrapper<TProxy> Wrap<TProxy, TChannel>(this TProxy proxy)
所以这是我的问题,“如何调用扩展的ClientBase版本?”
谢谢你, 斯蒂芬
答案 0 :(得分:1)
您必须为方法Wrap指定两个类型参数。那就是:
using (var proxy = new PLPlacementServiceClient().Wrap<PLPlacementServiceClient,/*type of the service contract PLPlacementServiceClient is implementing*/>())
{
var result = proxy.BaseObject.GetDocumentClassForNewBusiness();
}