C#How to refresh ASPxImage using ASPxCallbackPanel

How to refresh ASPxImage using ASPxCallbackPanel

Tags:

ASP.NET Web Forms

Sylo6 years ago

- Hi,
  
  I have an ASPXImage in an aspxcallbackPanel
  The aspximage.imageurl="image.gif"
  
  If I change the image on the server (create a new image and save it with the same name "image.gif") and do a callback, the Image of the aspximage is not refresh and keep the last image.
  
  I don't know if it's normal but how I can obtain an automatic refresh ?
  
  Thanks
  Sylo

1 Solution

Sergi (DevExpress Support)6 years ago

Hi Sylo,

It should be possible to accomplish this task by using the ASPxCallbackPanel. Please make sure that you are not sending a postback along with a callback. This may cause the incorrect behavior.
See the code below:

[ASPx]

<dx:ASPxCallbackPanel ID="ASPxCallbackPanel1" runat="server" ClientInstanceName="panel" OnCallback="ASPxCallbackPanel1_Callback" Width="200px"> <PanelCollection> <dx:PanelContent runat="server"> <dx:ASPxImage ID="ASPxImage1" runat="server" ImageUrl="~/Images/Image1.png" ShowLoadingImage="true"></dx:ASPxImage> </dx:PanelContent> </PanelCollection> </dx:ASPxCallbackPanel> <dx:ASPxButton ID="ASPxButton1" runat="server" AutoPostBack="false" Text="ASPxButton"> <ClientSideEvents Click="function(s, e) { panel.PerformCallback(); }" /> </dx:ASPxButton>

[C#]

protected void ASPxCallbackPanel1_Callback(object sender, DevExpress.Web.ASPxClasses.CallbackEventArgsBase e) { ASPxCallbackPanel panel = (ASPxCallbackPanel)sender; ASPxImage image = (ASPxImage)panel.FindControl("ASPxImage1"); image.ImageUrl = "~/Images/Image2.png"; }

[VB.NET]

Protected Sub ASPxCallbackPanel1_Callback(ByVal sender As Object, ByVal e As DevExpress.Web.ASPxClasses.CallbackEventArgsBase) Dim panel As ASPxCallbackPanel = CType(sender, ASPxCallbackPanel) Dim image As ASPxImage = CType(panel.FindControl("ASPxImage1"), ASPxImage) image.ImageUrl = "~/Images/Image2.png" End Sub

Feel free to contact us if you need further clarification on this issue.

UPDATED:

Thank you for your clarification. This issue is related to the fact that browser does not reload images with the same url on callbacks.
You can try the approaches posted in the Refresh image with a new one at the same url article to avoid this issue.

Sylo6 years ago

Hi Sergi,
Thanks for your answer
But in my case, the image have the same name... The image in the file change but not the name of the file...
Is it more clear ?
Thanks
Sylo
Sergi (DevExpress Support)6 years ago

Hi Sylo,

Thank you for your clarification. This issue is related to the fact that browser does not reload images with the same url on callbacks.
You can try the approaches posted in the Refresh image with a new one at the same url article to avoid this issue.
Sylo6 years ago

Good idea, thanks Sergi