[英]Asp.net long running process using asynch page
我有一个报告需要大约2到3分钟才能提取所有数据
所以我试图使用ASP.net Asynch页面来防止超时。 但无法正常工作
这是我在做什么:
private delegate List<PublishedPagesDataItem> AsyncReportDataDelegate();
private AsyncReportDataDelegate longRunningMethod;
private List<PublishedPagesDataItem> reportData;
public PublishedPagesReport() // this is the constructor
{
reportData = new List<PublishedPagesDataItem>();
longRunningMethod = GetReportData;
}
protected void Page_Load(object sender, EventArgs e)
{
this.PreRenderComplete +=
new EventHandler(Page_PreRenderComplete);
AddOnPreRenderCompleteAsync(
new BeginEventHandler(BeginAsynchOperation),
new EndEventHandler(EndAsynchOperation)
);
}
private List<PublishedPagesDataItem> GetReportData()
{
// this is a long running method
}
private IAsyncResult BeginAsynchOperation(object sender, EventArgs e, AsyncCallback cb, object extradata)
{
return longRunningMethod.BeginInvoke(cb, extradata);
}
private void EndAsynchOperation(IAsyncResult ar)
{
reportData = longRunningMethod.EndInvoke(ar);
}
private void Page_PreRenderComplete(object sender, EventArgs e)
{
reportGridView.DataSource = reportData;
reportGridView.DataBind();
}
所以我有一个代表长期运行方法(GetReportData)的委托。
我试图按照这篇文章来称呼它:
http://msdn.microsoft.com/zh-CN/magazine/cc163725.aspx
长时间运行的方法确实在调试器中完成,但是EndAsynchOperation和Page_PreRenderComplete方法上的断点永远不会被击中
知道我在做什么错吗?
下面的代码有效。 不知道有什么区别,除了有一个if (!IsPostBack)
无论如何,现在解决了
private delegate List<PublishedPagesDataItem> AsyncReportDataDelegate();
private AsyncReportDataDelegate longRunningMethod;
private List<PublishedPagesDataItem> reportData;
public asynchtest()
{
reportData = new List<PublishedPagesDataItem>();
longRunningMethod = GetReportData;
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// Hook PreRenderComplete event for data binding
this.PreRenderComplete +=
new EventHandler(Page_PreRenderComplete);
// Register async methods
AddOnPreRenderCompleteAsync(
new BeginEventHandler(BeginAsyncOperation),
new EndEventHandler(EndAsyncOperation)
);
}
}
IAsyncResult BeginAsyncOperation(object sender, EventArgs e,
AsyncCallback cb, object state)
{
return longRunningMethod.BeginInvoke(cb, state);
}
void EndAsyncOperation(IAsyncResult ar)
{
reportData = longRunningMethod.EndInvoke(ar);
}
protected void Page_PreRenderComplete(object sender, EventArgs e)
{
Output.DataSource = reportData;
Output.DataBind();
}
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