Dispose神秘地调用了我的对象

我遇到了一个奇怪的问题：

我有一个对象（在简化视图中）看起来像这样：

public class LogService : ILogProvider
{
    private ServiceHost host;
    public void Open()
    {
        // Open Service
    }
    public void Dispose()
    {
        // host.Dispose();
    }
}

此对象正被引用为其他类上的字段。

偶尔在我的应用程序中，我会重新创建服务（我想这会导致LogService对象被收集）。

然而，我看到LogService的Dispose（）方法正在被调用，尽管我在代码库中没有直接调用它！

调试时，Visual Studio中的调用程序"调用堆栈"是"外部"的，因此我无法查看它。

是什么原因造成的？当调用它时，host字段为null，并抛出一个nullreference。

以下是失败的调用堆栈：

Executer.dll！Executer.LogService.Dispose（）行54+0x6字节C#System.ServiceModel.dll！System.ServiceModel.Dispatcher.InstanceBehavior.InstanceProvider.ReleaseInstance（System.ServiceModel.InstanceContextinstanceContext，对象实例）+0x25字节
System.ServiceModel.dll！System.ServiceModel.Dispatcher.InstanceBehavior.ReleaseInstance（System.ServiceModel.InstanceContextinstanceContext，对象实例）+0x35字节
System.ServiceModel.dll！System.ServiceModel.InstanceContext.SetUserObject（对象newUserObject）+0x4e字节
System.ServiceModel.dll！System.ServiceModel.InstanceContext.Unload（）+0xf字节System.ServiceModel.dll！System.ServiceModel.InstanceContext.OnClose（System.TimeSpan超时）+0x1f字节
System.ServiceModel.dll！System.ServiceModel.Channels.CommunicationObject.Close（System.TimeSpan超时）+0x172字节
System.ServiceModel.dll！System.ServiceModel.InstanceContext.CloseIfNotBusy（）+0x76字节System.ServiceModel.dll！System.ServiceModel.InstanceContext.NotifyEmpty（System.ServiceModel.InstanceContextinstanceContext）+0xb字节
System.ServiceModel.dll！System.ServiceModel.ServiceChannelManager.OnEmpty（）+0x16字节System.ServiceModel.dll！System.ServiceModel.Channels.LifetimeManager.DecrementBusyCount（）+0xbc字节System.ServiceModel.dll！System.ServiceModel.ServiceChannelManager.ChannelRemoved（System.ServiceModel.Channels.IChannel通道）+0x37字节
System.ServiceModel.dll！System.ServiceModel.ServiceChannelManager.RemoveChannel（System.ServiceModel.Channels.IChannel通道）+0x42字节
System.ServiceModel.dll！System.ServiceModel.ServiceChannelManager.OnChannelClosed（对象sender，System.EventArgs args）+0x16字节
System.ServiceModel.dll！System.ServiceModel.Channels.CommunicationObject.OnClosed（）+0xd5字节System.ServiceModel.dll！System.ServiceModel.Channels.CommunicationObject.Artrt（）+0xcf字节System.ServiceModel.dll！System.ServiceModel.Channels.ServiceChannel.OnInnerChannelFaulted（对象发送方，System.EventArgs e）+0x46字节

public interface ILogProvider : IDisposable
{
    void Open();
}
public class LogService : ILogProvider
{
    private readonly ServiceHost host;
    public LogService(ServiceHost host)
    {
        this.host = host;
    }
    public void Open()
    {
        // Open Service
    }
    public void Dispose()
    {
        host.Dispose();
    }
}
public class ServiceHost : IDisposable
{
    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
    ~ServiceHost()
    {
        Dispose(false);
    }
    public virtual void Dispose(bool disposing)
    {
        if (disposing)
        {
            //do managed cleanup
        }
        // do unmanaged cleanup here            
    }
}
internal class Program
{
    private static void Main(string[] args)
    {
        var host = new ServiceHost();
        using (LogService log = new LogService(host))
        {
            host.Dispose();
        }
    }
}