release of resources

[r.bianco]

Reports.Web 2020.4.1.0

Good morning,
in the web application where we use the stimulsoft reports we have a problem of non-deallocated memory.
The report is displayed through the StiWebViewer object, in a new browser tab.
We would like to be able to intercept the closing of the browser tab to ask the StiWebViewer object to release the resources.
How you do it?

[Lech Kulikowski]

Hello,

You can use the static method for clear all data caches:
StiCacheCleaner.Clean(report);

You can use this method to force the current report to be deleted from the server cache:
var cacheGuid = $"{e.RequestParams.Id}_{e.RequestParams.Cache.ClientGuid}";
StiWebViewer.CacheHelper.RemoveReport(cacheGuid);

You can also change the caching method by overriding a special StiCacheHelper class - see documentation for more details:
https://www.stimulsoft.com/en/documenta ... ashing.htm

Thank you.

[r.bianco]

Unfortunately it doesn't seem like a cache problem.
I wish I could destroy the report object when the user closes the browser tab that contains the object.

In other words, when the user closes the browser tab, I would like to run this code:

Code: Select all

myReport.Dispose();
myReport = null;
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();

How do I intercept the closing of the tab?

[Lech Kulikowski]

Hello,

You can subscribe to a JavaScript event in your browser 'beforeunload', and there to send a request to the server, which will call the method with your code.

Thank you.

[r.bianco]

In the aspx page there is the StiWebViewer object:

Code: Select all

<cc2:StiWebViewer ID="StiWebViewer1" runat="server" OnReportDesign="StiWebViewer1_ReportDesign" />

Via Javascript, how do I activate an event of the StiWebViewer1 object?

[Lech Kulikowski]

Hello,

Which event do you want to activate? If you are referring to an earlier event, the viewer does not support such functionality.

Thank you.

[r.bianco]

My goal is: to execute the memory deallocation code when the user closes the browser tab which contains the StiWebViewer object.
Something like:

in aspx file

Code: Select all

        <cc2:StiWebViewer ID="StiWebViewer1" runat="server" OnReportDesign="StiWebViewer1_ReportDesign" OnDisposed="StiWebViewer1_Disposed"/>

		<script>
            window.beforeunload = function () {
                this.jsObject.postAction("Disposed");
			};
		</script>

in aspx.cs file

Code: Select all

    protected void StiWebViewer1_Disposed(object sender, EventArgs e)
    {
        using (StreamWriter file =
            new StreamWriter(sLog, true))
        {
            file.WriteLine("Unload");
        }

        StiReport myReport = StiWebViewer1.Report;
        myReport.Dispose();
        myReport = null;

        //Forza il garbage collector a liberare la memoria allocata dall'assembly e dai dati
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
    }

Unfortunately, the Disposed event does not trigger.
Should I use a different event?
Should I write the JavaScript code differently?

[Lech Kulikowski]

Hello,

Unfortunately, the viewer does not support such functionality.

Thank you.

[r.bianco]

OK thanks anyway.

[Andrew]

You are welcome!