//AsyncCallback asyncCallback; //实例化回调 全局变量
//AsyncObjectStateClass asyncObjectState; //实例化传入参数 全局变量
//AsyncMethodReturnObject asyncMethodReturnObject;//实例化返回结果 全局变量
/// <summary>
/// 申明供异步委托调用的任务执行函数
/// </summary>
/// <returns></returns>
private AsyncMethodReturnObject asyncMethodTask(AsyncMethodParameterObject sleepAsyncMethodParameterObject)
{
int sleepMS = (int)sleepAsyncMethodParameterObject.parameterObject;
ParallelLoopResult result = Parallel.For(0, 1, i =>
{
Thread.Sleep(sleepMS);
if (DoSomethingInAsyncTaskDemo != null)
{
DoSomethingInAsyncTaskDemo(this, sleepMS);
}
else
{
}
});
return(new AsyncMethodReturnObject((sleepMS - 1000).ToString()));
}
public async Task taskStartAsyncDelegate(object sleepMS)
{
if (true)
{
await Task.Run(() =>
{
AsyncMethodParameterObject asyncMethodParameterObject = new AsyncMethodParameterObject(sleepMS);
asyncDelegate asyncDelegateTask = new asyncDelegate(asyncMethodTask);
AsyncCallback asyncCallback = new AsyncCallback(callBackAsyncDelegate);
AsyncObjectStateClass asyncObjectState = new AsyncObjectStateClass(sleepMS); //实例化类，该对象可以传入回调函数中
IAsyncResult iar = (AsyncResult)asyncDelegateTask.BeginInvoke(asyncMethodParameterObject, asyncCallback, asyncObjectState); //异步执行Method，界面不会假死，后执行回调函数，弹出提示框
});
}
else //lambda形式
{
await Task.Run(() =>
{
//回调函数callback方法可以改写成lambda形式
//AsyncMethodParameterObject asyncMethodParameterObject = new AsyncMethodParameterObject(sleepMS);
new asyncDelegate(asyncMethodTask).BeginInvoke(new AsyncMethodParameterObject(sleepMS), ar =>
{ //回调函数写成了lambda形式
// Retrieve the delegate.
AsyncResult result = (AsyncResult)ar;
asyncDelegate caller = (asyncDelegate)result.AsyncDelegate;
// Retrieve the format string that was passed as state information.
AsyncObjectStateClass asyncObjectState = (AsyncObjectStateClass)ar.AsyncState;//通过AsyncState获取传入的object
// Call EndInvoke to retrieve the results.
AsyncMethodReturnObject asyncMethodReturnObject = caller.EndInvoke(ar);
//MessageBox.Show(formatString.ToString() + "\n\r" + returnValue);
}, new AsyncObjectStateClass("Return String"));
});
}
}
