用C ++编写事件并用C＃处理它们

我有一台带有一些数字I / O引脚的工业计算机。 制造商提供了一些C ++库和示例来处理引脚状态更改。

我需要将这些事件集成到C＃应用程序中。 AFAIK执行此操作的最简单方法是：

1. 为从DIO引脚发出中断时触发事件的制造商库创建托管C ++ / CLI包装器。
2. 引用包装并处理C＃部分中的事件，因为它们是正常的C＃事件。

我试图用一些没有运气的模拟对象来完成这项工作。 从文档中，函数EventHandler应该完成我案例中的大部分“脏工作”。 以下有关旧线程和MSDN文档中的EventHandler示例的信息，我最终得到了以下测试代码：

C ++ / CLI

using namespace System; public ref class ThresholdReachedEventArgs : public EventArgs { public: property int Threshold; property DateTime TimeReached; }; public ref class CppCounter { private: int threshold; int total; public: CppCounter() {}; CppCounter(int passedThreshold) { threshold = passedThreshold; } void Add(int x) { total += x; if (total >= threshold) { ThresholdReachedEventArgs^ args = gcnew ThresholdReachedEventArgs(); args->Threshold = threshold; args->TimeReached = DateTime::Now; OnThresholdReached(args); } } event EventHandler^ ThresholdReached; protected: virtual void OnThresholdReached(ThresholdReachedEventArgs^ e) { ThresholdReached(this, e); } }; public ref class SampleHandler { public: static void c_ThresholdReached(Object^ sender, ThresholdReachedEventArgs^ e) { Console::WriteLine("The threshold of {0} was reached at {1}.", e->Threshold, e->TimeReached); Environment::Exit(0); } }; void main() { return; CppCounter^ c = gcnew CppCounter(20); c->ThresholdReached += gcnew EventHandler(SampleHandler::c_ThresholdReached); Console::WriteLine("press 'a' key to increase total"); while (Console::ReadKey(true).KeyChar == 'a') { Console::WriteLine("adding one"); c->Add(1); } } 

C＃

 using System; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { CppCounter cc = new CppCounter(5); //cc.ThresholdReached += cs_ThresholdReached; //= threshold) { ThresholdReachedEventArgs args = new ThresholdReachedEventArgs(); args.Threshold = threshold; args.TimeReached = DateTime.Now; OnThresholdReached(args); } } protected virtual void OnThresholdReached(ThresholdReachedEventArgs e) { EventHandler handler = ThresholdReached; if (handler != null) { handler(this, e); } } public event EventHandler ThresholdReached; } public class ThresholdReachedEventArgs : EventArgs { public int Threshold { get; set; } public DateTime TimeReached { get; set; } } } 

我究竟做错了什么？ 这是我缺少的东西吗？

  public class ThresholdReachedEventArgs : EventArgs