BuyLog In
Ticket Q509861
Visible to All Users
Duplicate

We have closed this ticket because another page addresses its subject:

Enabling async tasks in XAF Web page

Calling async methods from XAF actions

created 12 years ago

I have a SimpleAction with execute method as follows:

C#
async void myAction_Execute(object sender, SimpleActionExecuteEventArgs e)  
{  
    await Task.Delay(1000);  
}

Unfortunately this gives the error:

Asynchronous operations are not allowed in this context. Page starting an asynchronous operation has to have the Async attribute set to true and an asynchronous operation can only be started on a page prior to PreRenderComplete event.

I have seen this similar issue (Q494002) but the fix suggested by several other sites (add Async="true" to the @Page directive) does not seem to work here. Is there anyway I can call async methods from controllers?

My demo project is attached,

Sign in to comment on this post

Answers approved by DevExpress Support

created 12 years ago (modified 10 years ago)

Hello Robert,
I am afraid that I have nothing to add to Dennis' answer. This error is caused by an ASP.NET limitation and is not related to our components. I suggest that you search how to work around this limitation on the Internet. For example: https://www.google.com/search?q=asp.net+background+thread

    Sign in to comment on this post

    Disclaimer: The information provided on DevExpress.com and affiliated web properties (including the DevExpress Support Center) is provided "as is" without warranty of any kind. Developer Express Inc disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. Please refer to the DevExpress.com Website Terms of Use for more information in this regard.

    Confidential Information: Developer Express Inc does not wish to receive, will not act to procure, nor will it solicit, confidential or proprietary materials and information from you through the DevExpress Support Center or its web properties. Any and all materials or information divulged during chats, email communications, online discussions, Support Center tickets, or made available to Developer Express Inc in any manner will be deemed NOT to be confidential by Developer Express Inc. Please refer to the DevExpress.com Website Terms of Use for more information in this regard.