我想在.Net Core(2.2)中使用微软的依赖注入来注入并安全地释放WCF客户端。我正在 VS2019 中使用“WCF Web 服务参考提供程序工具”将 WCF 代理类添加到我的解决方案中。使用 Microsoft.Extensions.DependencyInjection 我可以在服务集合中注册客户端,但我似乎找不到一种挂钩发布生命周期事件的方法(可以在各种其他 IoC 框架中完成,例如 Autofac),以添加根据此处描述的 Microsoft 建议进行安全发布的代码:https://learn.microsoft.com/en-us/dotnet/framework/wcf/samples/use-close-abort-release-wcf-client-resources
.Net Core 框架附带的相当基本的依赖注入功能有没有办法做类似的事情?或者我被迫使用第 3 方 IoC 框架?
所以基本上我想做这样的事情:
// Register the channel factory for the service. Make it
// Singleton since you don't need a new one each time.
services.AddSingleton(p => new ChannelFactory<IWcfService>(
new BasicHttpBinding(),
new EndpointAddress("http://localhost/WcfService")));
// Register the service interface using a lambda that creates
// a channel from the factory.
// TODO: need a way to handle proper disposal, e.g. like OnRelease().
services.AddTransient<IWcfService>(p =>
p.GetService<ChannelFactory<IWcfService>>().CreateChannel())
.OnRelease(CloseChannel); // <---This is what I would like to do
static void CloseChannel<T>(T channel)
{
var disp = (ICommunicationObject) channel;
try
{
if (disp.State == CommunicationState.Faulted)
disp.Abort();
else
disp.Close();
}
catch (TimeoutException)
{
disp.Abort();
}
catch (CommunicationException)
{
disp.Abort();
}
catch (Exception)
{
disp.Abort();
throw;
}
}
但是我需要一种方法来挂钩服务发布生命周期事件,例如类似 Autofac 中的 .OnRelease() 之类的东西,这样我就可以进行适当的处理。
我不知道您是否还需要回复,但为了解决这个问题,我将 dispose 实现到了部分类中。
每次处理 wcf 客户端时都会进行正确的清理:
public partial class MyWcfClient : IDisposable
{
protected void Dispose(bool disposing)
{
if (disposing)
{
bool success = false;
try
{
if (State != CommunicationState.Faulted)
{
Close();
}
success = true;
}
finally
{
if (!success)
{
Abort();
}
}
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
}
为了解决同样的问题,我创建了一个包装类,并将其注册为 DI 中的中间体:
public class ChannelWrapper<T> : IDisposable
{
private readonly ILogger<ChannelWrapper<T>> _logger;
public T Channel { get; }
public ChannelWrapper(ChannelFactory<T> factory, ILogger<ChannelWrapper<T>> logger)
{
_logger = logger;
Channel = factory.CreateChannel();
}
public void Dispose()
{
if (Channel is not ICommunicationObject communicationObject)
{
return;
}
try
{
if (communicationObject.State == CommunicationState.Faulted)
{
_logger.LogDebug("Aborting faulted channel");
communicationObject.Abort();
}
else
{
_logger.LogDebug("Closing channel");
communicationObject.Close();
}
}
catch (TimeoutException)
{
_logger.LogDebug("Aborting timed out channel");
communicationObject.Abort();
}
catch (CommunicationException ex)
{
_logger.LogDebug(ex, "Aborting channel");
communicationObject.Abort();
}
catch (Exception)
{
_logger.LogDebug("Aborting channel during exception");
communicationObject.Abort();
throw;
}
}
}
并注册如下:
services.AddTransient(typeof(ChannelWrapper<>));
services.AddSingleton(new ChannelFactory<ISomeService>(binding, new EndpointAddress("net.tcp://localhost:1234/someservice")));
services.AddTransient<ISomeService>(provider => provider.GetRequiredService<ChannelWrapper<ISomeService>>().Channel);