/// <summary>
/// Begins the wrapped operation.
/// </summary>
/// <typeparam name="T">The type of the operation result.</typeparam>
/// <param name="begin">The begin.</param>
/// <param name="end">The end.</param>
/// <param name="callback">The callback.</param>
/// <param name="state">The state.</param>
/// <returns>The async result.</returns>
public static IAsyncResult BeginWrap <T>(AsyncBegin begin, AsyncEnd <T> end, AsyncCallback callback, object state)
{
Requires.NotNull(begin, "begin");
Requires.NotNull(end, "end");
return(new AsyncResultWrapper <T>(begin, end, callback, state));
}
/// <summary>
/// Initializes a new instance of the <see cref="AsyncResultWrapper"/> class.
/// </summary>
/// <param name="begin">The begin.</param>
/// <param name="end">The end.</param>
/// <param name="callback">The callback.</param>
/// <param name="state">The state.</param>
internal AsyncResultWrapper(AsyncBegin begin, AsyncEnd end, AsyncCallback callback, object state)
{
this.end = end;
this.callback = callback;
this.state = state;
this.result = begin(this.OnCompleted, null);
}
/// <summary>Simplified calling convention for asynchronous Begin/End operations.</summary>
/// <typeparam name="T">The type of data returned by the async operation.</typeparam>
/// <param name="begin">The start (Begin*) of the async operation.</param>
/// <param name="end">The end (End*) of the async operation.</param>
/// <param name="callback">The operation to perform once the operation has completed and a value received.</param>
/// <param name="exceptionHandler">Callback to invoke when an excetption is thrown during the async operation.</param>
public static void RunAsync <T>(
AsyncBegin <T> begin,
AsyncEnd <T> end,
Action <T> callback,
Action <Exception> exceptionHandler)
{
begin(delegate(IAsyncResult ar)
{
T result;
try
{
result = end(ar);
}
catch (Exception ex)
{
if (exceptionHandler != null)
{
exceptionHandler(ex);
}
return;
}
callback(result);
}, null);
}
