How to check whether UpdatePanel is posting back?

问题

Is there a way to determine if an <asp:UpdatePanel /> has performed an Ajax postback similar to how we can use...

if(!Page.IsPostBack) { ...snip }

... to determine if a postback from a button submit is taking place.

I'm trying to detect Ajax requests from jQuery, but it's picking up UpdatePanel requests as well which I want to exclude eg...

if (Request.IsAjaxRequest() && !Page.IsUpdatePanelPostback)
{
    // Deal with jQuery Ajax
}

回答1:

I don't know if this will work any better than your solution, but have you tried?:

if (ScriptManager.GetCurrent(Page).IsInAsyncPostBack)
{
    Control ctrl = GetControlThatCausedPostBack(Page);
    if (ctrl is UpdatePanel)
    {
        //handle updatepanel postback
    }
}

private Control GetControlThatCausedPostBack(Page page)
{
    //initialize a control and set it to null
    Control ctrl = null;

    //get the event target name and find the control
    string ctrlName = Page.Request.Params.Get("__EVENTTARGET");
    if (!String.IsNullOrEmpty(ctrlName))
        ctrl = page.FindControl(ctrlName);

    //return the control to the calling method
    return ctrl;
}

回答2:

You can check whether the postback was asynchronous and whether it was issued by an update panel looking at these properties:

ScriptManager.GetCurrent(Page).IsInAsyncPostback
ScriptManager.GetCurrent(Page).AsyncPostbackSourceElementID

回答3:

Try out following:

var controlName = Page.Request.Params.Get("__EVENTTARGET");
if (!String.IsNullOrEmpty(controlName))
{
     // Use FindControl(controlName) to see whether 
     // control is of UpdatePanel type
}

Helpful links:

• ASP.NET: Recursive FindControl & Extension Methods

来源：https://stackoverflow.com/questions/8184331/how-to-check-whether-updatepanel-is-posting-back