/// <summary>
/// 封装异步操作方法.
/// </summary>
/// <typeparam name="TAsyncResult">异步操作的状态接口.</typeparam>
/// <param name="callback">引用在相应异步操作完成时调用的方法.</param>
/// <param name="beginOperation">引用带返回值的相应异步操作完成时调用的方法.</param>
/// <param name="wrappingResultCreator">引用带返回值的相应异步操作完成时调用的方法.</param>
/// <returns>异步操作的状态接口</returns>
public static IAsyncResult BeginAsyncOperation <TAsyncResult>(AsyncCallback callback, Func <AsyncCallback, IAsyncResult> beginOperation,
Func <IAsyncResult, TAsyncResult> wrappingResultCreator)
where TAsyncResult : class, IAsyncResult
{
callback.NotNull("callback");
object lockObject = new object();
TAsyncResult result = null;
AsyncCallback wrapperCallback = null;
if (callback != null)
{
wrapperCallback = ar =>
{
if (!ar.CompletedSynchronously)
{
lock (lockObject)
{
callback(result);
}
}
};
}
lock (lockObject)
{
IAsyncResult innerAsyncResult = beginOperation(wrapperCallback);
result = wrappingResultCreator(innerAsyncResult);
}
if (result.CompletedSynchronously && callback != null)
{
callback(result);
}
return(result);
}