how to fix reportviewer rendering exception when EnablePartialRendering on ScriptManager is set to true

Gimi 20

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In our MVC application we are calling an ASPx page (using an iframe) that contains a reportviewer control, the reports are loading but when I click "Show report" button after I give the parameters the page turns blank until full postback is finished, I found a "solution" that setting "EnablePartialRendering" to true in script manager will show a loading spinner until the data are loaded, yes the spinner is showing, but the data aren't loading and when I check Output window in Visual Studio I see  a Sys.WebForms.PageRequestManagerParseErrorException with message "The message received from the server could not be parsed".  All I want is just to show that loading spinner until data are loaded.  this is the code in my aspx:     <form id="form1" runat ="server">    <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true"/>    <asp:HiddenField ID="myHiddenField" runat="server"/>   <rsweb:ReportViewer ID="myReportViewer" runat="server" AsyncRendering="true" ProcessingMode="Remote">
<ServerReport /> 
</rsweb:ReportViewer>
 </form>   
Any help about this issue is appreciated

XuDong Peng-MSFT 10,096 Reputation points Microsoft Vendor

2023-02-07T07:06:23.1566667+00:00

Hi @Gimi,

As mentioned in the offical doc, the default value of ScriptManager.EnablePartialRendering Property is true. Do you mean the app works correctly when you manually set it to false? And in the code you provided, you didn't use the UpdatePanel control, what is the purpose of you setting this property?

If possible, please provide more details that we can understand your question better. For example the code that we can reproduce your issue. Thank you for your understanding.
Gimi 20 Reputation points

2023-02-07T10:03:17.2266667+00:00
@XuDong Peng-MSFT yes the default value is set to true and the loading indicator in report viewer shows correctly when it is starting to load the data, but in the middle of loading data it stops and gives the error I mentioned in my first comment(Sys.WebForms.PageRequestManagerParseErrorException with message "The message received from the server could not be parsed").

So when EnablePartialRendering is set to false the data are loaded but indicator isn't showing, and when EnablePartialRendering is set to true the indicator is showing but data not loaded, and by the way I am using the version 15.0.0.0 of reportviewer.

Edit: The reason update panel was missing in my original post is because of documentation, I was looking if updatepanel was causing the issue, based on documentation here https://learn.microsoft.com/en-us/sql/reporting-services/application-integration/integrating-reporting-services-using-reportviewer-controls-get-started?source=recommendations&view=sql-server-ver16 the updatepanel isn't needed?

And yes you are correct that wasn't my original code, here is the original code:

<form id="Form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" > </asp:ScriptManager> <asp:UpdatePanel runat="server"> <ContentTemplate> <asp:HiddenField ID="myHiddenField" runat="server" /> <rsweb:ReportViewer ID="ReportViewer1" runat="server" AsyncRendering="True" ProcessingMode="Remote" > <ServerReport></ServerReport> </rsweb:ReportViewer> </ContentTemplate> </asp:UpdatePanel> </form>
XuDong Peng-MSFT 10,096 Reputation points Microsoft Vendor

2023-02-08T10:16:13.9466667+00:00

Hi @Gimi,

Does this iframe only contain the reportviewer control? Also I'm not sure how the updatePanel control triggers the update event, is there a trigger defined?

In addition, as mentioned in the offical documentation, the ReportViewer control has corresponding properties to control the asynchronous postback behavior: To control the asynchronous postback behavior, use the InteractivityPostBackMode property. Have you tried setting this property?
Gimi 20 Reputation points

2023-02-08T11:07:39.4+00:00

@XuDong Peng-MSFT the iframe is defined in mvc view and contains only the Url of this aspx page which contains the reportviewer control as shown above, I will check the InteractivityPostBackMode property to see if anything changes,
Thank you.
Gimi 20 Reputation points

2023-02-11T22:24:43.81+00:00

@XuDong Peng-MSFT I tried setting that property but it didn't change anything, I wonder if there is any way to caught the loading start and loading end events when I have EnablePartialRendering false?
Gimi 20 Reputation points

2023-02-12T12:15:00.5366667+00:00

@XuDong Peng-MSFT I have done the exact implementation of ReportTemplate in this article, if that can help identify what's wrong with it, because I can't find anything wrong in this implementation
https://www.c-sharpcorner.com/article/how-to-display-ssrs-report-in-asp-net-mvc-web-application/

Accepted answer

XuDong Peng-MSFT 10,096 Reputation points Microsoft Vendor

2023-02-13T07:06:25.4666667+00:00

Hi @Gimi,

I tried to reproduce this issue but failed. I got error message by the command line based on the article you mentioned, something like this:

I also cannot find it in NuGet Package. It only shows these four:

So I just add the reportViewer.aspx in iframe (using querystring) and it works fine . Result below:

If possible, please provide more details that we can reproduce your issue. For more details about my test, please refer to the code in the attachment: SimpleDemo.txt

Best regards,

Xudong Peng

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1 additional answer

Olaf Helper 40,736 Reputation points

2023-02-08T11:29:53.99+00:00

The normal MS ReportViewer control for Web don't work in MVC web application, because the callback goes to the controller of your app, not to SSRS.

Use this instead: https://github.com/chasoliveira/ReportViewerForMvc
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Gimi 20 Reputation points

2023-02-08T13:41:07.4566667+00:00

@Olaf Helper that library does almost exactly what we have implemented, it calls an ASPX page to render it content by using an iframe in the MVC viewer, the display of reports isn't an issue, the issue is after clicking the "View Report" button, when EnablePartialRendering property in ScriptManager is set to true it throws exception, when it is set to false it shows the data but the "Loading" indicator does not show up while it is loading data.
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