带有 IObservable 的 MethodCallExpression 向 System.CoreEx 抛出访问被拒绝异常

发布于 2024-09-26 04:57:21 字数 875 浏览 2 评论 0原文

我有一个 MethodCallExpression 对象，我尝试使用 Reactive Extensions 框架从该对象返回一个 IObservable 实例。

private IObservable<Thing> GetThing(Expression<Func<Thing>> expression)
{
   Func<Thing> method = expression.Compile()
   var observable = Observable.FromAsyncPattern<Thing>(method.BeginInvoke, method.EndInvoke);
   IObservable<Thing> observable = observable();
   return observable;
}

问题是，当执行此命令时，我在 observable() 上收到以下运行时异常：

无法加载文件或程序集“System.CoreEx，Version=1.0.2617.104，Culture=neutral，PublicKeyToken=31bf3856ad364e35”或其依赖项之一。访问被拒绝。

如果我在没有反应性框架的情况下运行该方法，一切都很好。

 Thing item = method();

有什么想法造成这种情况吗？所有程序集引用均已添加。

编辑我应该补充一点，所讨论的表达式包含一个在使用 Moq 创建的模拟对象上执行的方法。

原文

I have a MethodCallExpression object from which I'm trying to return a IObservable<Thing> instance using the Reactive Extensions framework.

private IObservable<Thing> GetThing(Expression<Func<Thing>> expression)
{
   Func<Thing> method = expression.Compile()
   var observable = Observable.FromAsyncPattern<Thing>(method.BeginInvoke, method.EndInvoke);
   IObservable<Thing> observable = observable();
   return observable;
}

The issue is that when this executes I get the following runtime exception on observable():

Could not load file or assembly 'System.CoreEx, Version=1.0.2617.104, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. Access is denied.

If I run the method without the Reactive framework everything is fine.

 Thing item = method();

Any ideas what's causing this? All assembly references are added.

Edit I should add that the expression in question contains a method which executes on a Mocked object created using Moq.

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寄与心 2024-10-03 04:57:22

是否为当前用户安装了反应式框架？您对此文件有读取/可执行权限吗？

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你列表最软的妹 2024-10-03 04:57:22

好吧，我设法让它工作，尽管我从未真正了解访问被拒绝问题的根源。可能是重启后解决了这个问题。在剥离我的代码并重建它之后，我开始遇到不同的错误：

The object must be a runtime Reflection object

然后我将代码更改为在应用 Rx 之前将方法调用包装到 Action 中，并且这有效：

private IObservable<Thing> GetThing(Expression<Func<Thing>> expression)
{
   var method = expression.Compile();
   Func<Thing> = () => method();
   var observable = Observable.FromAsyncPattern<Thing>(method.BeginInvoke, method.EndInvoke);
   return observable();
}

据记录我能够进一步减少这种情况：

private IObservable<Thing> GetThing(Expression<Func<Thing>> expression)
{
   var method = expression.Compile();
   Func<Thing> action = () => method();
   return Observable.Start(action);
}

Well I managed to get it working, although I never really got to the bottom of the Access Denied issue. It may have been a reboot that resolved it. After stripping my code right back and rebuilding it I starting getting a different error:

The object must be a runtime Reflection object

I then changed the code to wrap to method invoke into an Action before applying Rx, and this worked:

private IObservable<Thing> GetThing(Expression<Func<Thing>> expression)
{
   var method = expression.Compile();
   Func<Thing> = () => method();
   var observable = Observable.FromAsyncPattern<Thing>(method.BeginInvoke, method.EndInvoke);
   return observable();
}

For the record I was able to reduce this further:

private IObservable<Thing> GetThing(Expression<Func<Thing>> expression)
{
   var method = expression.Compile();
   Func<Thing> action = () => method();
   return Observable.Start(action);
}

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~没有更多了~