/// <summary>
/// Implementation of asynchronous function called by sub-classes with appropriate 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>
/// <typeparam name="TResult">Result 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="funcProxy">Function being called.</param>
/// <param name="funcEvent">Function to create TEventArgs from results.</param>
public void AsyncFuncImpl <TData, TResult>(TData data
, AsyncOperationFuncDefaultDelegate <TData, TResult> operation
, Func <TData, TResult> funcProxy
, MakeFuncEventDelegate <TData, TResult> funcEvent)
{
this.AsyncFuncImpl(null, data, operation, funcProxy, funcEvent);
}
/// <summary>
/// Implementation of asynchronous function called by sub-classes with appropriate 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>
/// <typeparam name="TResult">Result data type of operation.</typeparam>
/// <param name="data">Operation input data.</param>
/// <param name="funcProxy">Function being called.</param>
/// <param name="funcEvent">Function to create TEventArgs from results.</param>
public void AsyncFuncImpl <TData, TResult>(object userState
, TData data
, Func <TData, TResult> funcProxy
, MakeFuncEventDelegate <TData, TResult> funcEvent
)
{
this.AsyncFuncImpl(userState, data, AsyncOperationFuncDefaultImpl, funcProxy, funcEvent);
}
// Implementation defined in sub-class.
/// <summary>
/// Implementation of asynchronous function called by sub-classes with appropriate function parameters
/// to perform the asynchronous operation, and turn results into TEventArgs.
/// </summary>
/// <typeparam name="TData">Input data type of operation.</typeparam>
/// <typeparam name="TResult">Result 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="funcProxy">Function being called.</param>
/// <param name="funcEvent">Function to create TEventArgs from results.</param>
public void AsyncFuncImpl <TData, TResult>(object userState
, TData data
, AsyncOperationFuncDefaultDelegate <TData, TResult> operation
, Func <TData, TResult> funcProxy
, MakeFuncEventDelegate <TData, TResult> funcEvent
)
{
AsyncOperation asyncOp = this.CreateOperation(userState);
DataAndFunc <TData, TResult> datafunction = new DataAndFunc <TData, TResult>
{
operation = operation,
data = data,
func = funcProxy,
funcEvent = funcEvent
};
AsyncOperationFuncDelegate <TData, TResult> asyncDelegate = this.AsyncOperationFunc <TData, TResult>;
asyncDelegate.BeginInvoke(datafunction, asyncOp, null, null);
}
public static TEventArgs AsyncOperationFuncDefaultImpl <TData, TResult>(TData data, Func <TData, TResult> func, bool cancelled, object userState,
MakeFuncEventDelegate <TData, TResult> funcEvent)
{
Exception e = null;
TResult result = default(TResult);
try
{
result = func(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, result, e, cancelled, userState));
}
