/// <summary>
/// Implementation of asynchronous function called by sub-classes with appropriate action and function parameters
/// to perform the asynchronous operation, and turn results into TEventArgs.
/// This override just defaults the userState object to null.
/// </summary>
/// <typeparam name="TData">Input data type of operation.</typeparam>
/// <param name="data">Operation input data.</param>
/// <param name="operation">Operation being called in another thread by AsyncOperation.</param>
/// <param name="actionProxy">Action being called.</param>
/// <param name="funcEvent">Function to create TEventArgs from results.</param>
public void AsyncActionImpl <TData>(TData data
, AsyncOperationActionDefaultDelegate <TData> operation
, Action <TData> actionProxy
, MakeActionEventDelegate <TData> funcEvent)
{
this.AsyncActionImpl(null, data, operation, actionProxy, funcEvent);
}
/// <summary>
/// Implementation of asynchronous function called by sub-classes with appropriate action and function parameters
/// to perform the asynchronous operation, and turn results into TEventArgs.
/// This overload requires no operation delegate specified for AsyncOperation.
/// </summary>
/// <typeparam name="TData">Input data type of operation.</typeparam>
/// <param name="data">Operation input data.</param>
/// <param name="operation">Operation being called in another thread by AsyncOperation.</param>
/// <param name="actionProxy">Action being called.</param>
/// <param name="funcEvent">Function to create TEventArgs from results.</param>
public void AsyncActionImpl <TData>(object userState
, TData data
, Action <TData> actionProxy
, MakeActionEventDelegate <TData> funcEvent
)
{
this.AsyncActionImpl(userState, data, AsyncOperationActionDefaultImpl, actionProxy, funcEvent);
}
// Implementation defined in sub-class.
/// <summary>
/// Implementation of asynchronous function called by sub-classes with appropriate action and function parameters
/// to perform the asynchronous operation, and turn results into TEventArgs.
/// </summary>
/// <typeparam name="TData">Input data type of operation.</typeparam>
/// <param name="userState">User state object provided by calling code.</param>
/// <param name="data">Operation input data.</param>
/// <param name="operation">Operation being called in another thread by AsyncOperation.</param>
/// <param name="actionProxy">Action being called.</param>
/// <param name="funcEvent">Function to create TEventArgs from results.</param>
public void AsyncActionImpl <TData>(object userState
, TData data
, AsyncOperationActionDefaultDelegate <TData> operation
, Action <TData> actionProxy
, MakeActionEventDelegate <TData> funcEvent
)
{
AsyncOperation asyncOp = this.CreateOperation(userState);
DataAndAction <TData> dataaction = new DataAndAction <TData>
{
operation = operation,
data = data,
action = actionProxy,
funcEvent = funcEvent
};
AsyncOperationActionDelegate <TData> asyncDelegate = this.AsyncOperationAction <TData>;
asyncDelegate.BeginInvoke(dataaction, asyncOp, null, null);
}
public static TEventArgs AsyncOperationActionDefaultImpl <TData>(TData data, Action <TData> action, bool cancelled, object userState,
MakeActionEventDelegate <TData> funcEvent)
{
Exception e = null;
try
{
action(data);
}
catch (Exception ex)
{
e = ex;
}
object userStateOriginal = userState;
if (userState is UserStateHolder)
{
// Get the original user-provided object out of the holder.
userState = ((UserStateHolder)userState).UserState;
}
return(funcEvent(data, e, cancelled, userState));
}
