[英]Convert Custom EventHandler to IObservable
I'm currently try to learning Reactive programming in C# with trying to convert my old project to Reactive, I use a dll file to connect to a biometric machine, this is some event exposed by the dll, how I can convert this to Observable using Observable.FromEvent? 我目前正在尝试通过尝试将旧项目转换为Reactive来学习C#中的Reactive编程,我使用dll文件连接到生物识别机器,这是dll暴露的事件,我如何使用以下方法将其转换为Observable Observable.FromEvent?
// I use the event like this,
axCZKEM.OnAttTransactionEx += new _IZKEMEvents_OnAttTransactionExEventHandler(axCZKEM_OnAttTransactionEx);
and this is the generated metadata 这是生成的元数据
#region Assembly Interop.zkemkeeper, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
// C:\Project\C#\obj\Debug\Interop.zkemkeeper.dll
#endregion
using System.Runtime.InteropServices;
namespace zkemkeeper
{
[ComVisible(false)]
[TypeLibType(16)]
public delegate void _IZKEMEvents_OnAttTransactionExEventHandler(
string EnrollNumber,
int IsInValid,
int AttState,
int VerifyMethod,
int Year,
int Month,
int Day,
int Hour,
int Minute,
int Second,
int WorkCode);
}
Even I am new to Reactive programming, But I will try as there are no other answers, You will need two things here. 即使我是Reactive编程的新手,但由于没有其他答案,我会尝试的,这里您将需要两件事。 One, Use a wrapper for your event args. 第一,为事件args使用包装器。
internal class MyArgs
{
public string EnrollNumber;
public int IsInValid;
public int AttState;
public int VerifyMethod;
public int Year;
public int Month;
public int Day;
public int Hour;
public int Minute;
public int Second;
public int WorkCode;
}
Then use FromEvent with a converter to convert your args into MyArgs. 然后将FromEvent与转换器一起使用,将args转换为MyArgs。
var observable = Observable.FromEvent<_IZKEMEvents_OnAttTransactionExEventHandler, MyArgs>(
converter => new _IZKEMEvents_OnAttTransactionExEventHandler(
(enrollNumber, isInValid, attState, verifyMethod, year, month, day, hour, minute, second, workCode)
=> converter(new MyArgs
{
EnrollNumber = enrollNumber,
IsInValid = isInValid,
AttState = attState,
VerifyMethod = verifyMethod,
Day=day,
Hour=hour,
Minute=minute,
Month=month,
Second=second,
WorkCode=workCode,
Year=year
})
),
handler => axCZKEM.OnAttTransactionEx += handler,
handler => axCZKEM.OnAttTransactionEx -= handler);
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