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Using Isolated Storage on Report Extensions

Aktualisiert: 9. Aug. 2022


Do you want to learn more about Isolated Storages?

Isolated Storage is a data storage that provides isolation between extensions, so that you can keep keys/values in one extension from being accessed from other extensions.

Lets extend the standard "Copy Purchase Document" report to get some customization there.

reportextension 50300 "BIT Copy Purchase Document" extends "Copy Purchase Document"
{
    requestpage
    {
        layout
        {
            addlast(Options)
            {
                field(CopyHTMLTexts; CopyHTMLTexts)
                {
                    ApplicationArea = All;
                    trigger OnValidate()
                    begin
                        if IsolatedStorage.Contains('Html') then
                            IsolatedStorage.Delete('Html');
                        IsolatedStorage.Set('Html', Format(CopyHTMLTexts));
                    end;

                }
            }
        }
    }

    var
        CopyHTMLTexts: Boolean;
}


After we published the code of our first implementation we discovered a very strange behaviour in our local docker container and even in our SaaS tenant.

By validating that field on my requestpage the webclient throws an exception:




Ok, something went wrong, but what exactly?


Let take a look at the event log by running powershell and the "Get-BcContainerEventLog"

command:


Ok that's the problem:

Unable to cast object of type 'Microsoft.Dynamics.Nav.Runtime.NCLReportExtension' to type 'Microsoft.Dynamics.Nav.Runtime.NCLPageExtension'.

If you get this kind of an error just move your code into a procedure to cast it correctly ;-)



reportextension 50300 "BIT Copy Purchase Document" extends "Copy Purchase Document"
{
    requestpage
    {
        layout
        {
            addlast(Options)
            {
                field(CopyHTMLTexts; CopyHTMLTexts)
                {
                    ApplicationArea = All;
                    trigger OnValidate()
                    begin
                        SetIsolatedStorage();
                    end;

                }
            }
        }
    }

    local procedure SetIsolatedStorage()
    begin
        if IsolatedStorage.Contains('Html') then
            IsolatedStorage.Delete('Html');
        IsolatedStorage.Set('Html', Format(CopyHTMLTexts));
    end;

    var
        CopyHTMLTexts: Boolean;
}



Yes!

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