Overview

Delegates in Microsoft Dynamics D365 are the methods for accessing elements in higher model  from a lower model & solving dependencies among models.Delegates serves as a contract between delegate instance & delegate handler.

For example

I have a scenario.I have 2 models i.e. Model A & Model B.In Model B i passed the reference of model A but vice-versa is not possible.It means i can call objects of model A in model B.But i cannot call objects of Model B in Model A.Here we can use delegates for accessing Model B values in Model A.

Sample Code & Explanation

1. Create a Model A & create a delegate.Delegate method should be empty and void type.[code language = “cpp”]
   public class MyClassInModelA
   {
   delegate void myDelegate(EventHandlerResult _result)
   {
   }
   }
   [/code]
2. Create a Model B & passed the reference of Model B using “Update Model Parameters”.It means i can call objects of model A.
3. Create a class in Model B & write a delegate handler.[code language = “cpp”]
   class MyClassInModelB
   {
   [SubscribesTo(classStr(MyClassInModelA), delegateStr(MyClassInModelA, myDelegate))]
   public static void myDelegateHandler(EventHandlerResult _result)
   {
   str ret = “Hi!This is Model B Values”;
   _result.result(ret);
   }
   }
   [/code]
4. Call the subscription of delegate in Model A & access the values of Model B in          Model A.In this way, i am calling Values of Model B in Model A without passing the reference of Model B in Model A.[code language = “cpp”]
   public class MyClassInModelA
   {

   delegate void myDelegate(EventHandlerResult _result)
   {
   }
   public static client server void main(Args args)
   {
   MyClassInModelA myClassInModelA = new MyClassInModelA();
   MyClassInModelA.myMethod();
   }
   public void myMethod()
   {
   EventHandlerResult result = new EventHandlerResult();
   this.myDelegate(result);
   str common = result.result();
   info(common);
   }
   }
   [/code]

Purpose

The purpose is to demonstrate the use of SQL IN operator in X++.

Limitation

The use of IN operator in X++ is only applicable for fields of data type ENUM.

Sample Code

[code language = “cpp”]
SalesTable salesTable;
container con = [SalesType::Sales, SalesType::ReturnItem, SalesType::Subscription];
while select * from salesTable
where salesTable.SalesType in con
{
Info(salesTable.SalesId);
}
[/code]

Purpose

The purpose is to demonstrate the working code sample for printing SSRS Report Directly To The Active Network Printer Using X++.

Prerequisite

1. Document Routing Agent should be enable.
2. There should be atleast one active network printer.

Please refer below link for installing the document routing:

https://docs.microsoft.com/en-us/dynamics365/unified-operations/dev-itpro/analytics/install-document-routing-agent

Steps & Sample Code

You can modify below sample code as per your need.This is just a prototype.

[code language = “cpp”]
SrsReportRunController reportRunController = new SrsReportRunController();
dataContract = new AcxInvoiceDataContract();
reportRunController.parmReportName(ssrsReportStr(AcxInvoiceReport,dgsCredit));
reportRunController.parmDialogCaption(“Print CREDIT NOTE”);
args.menuItemType(MenuItemType::Output);
args.menuItemName(identifierStr(AcxCreditReport));
reportRunController.parmArgs(args);
reportRunController.parmLoadFromSysLastValue(false);
reportRunController.parmShowDialog(false);
dataContract.parmInvoiceId(custInvoiceJourLocal.InvoiceId);
dataContract.parmCopyName(“Original for Recipient”);
reportRunController.parmReportContract().parmRdpContract(dataContract);
reportRunController.parmReportContract().parmPrintSettings().printMediumType(SRSPrintMediumType::Printer);

// here is i am selecting only first active printer but you can make it configurable
select firstonly netPrinters
where netPrinters.PrinterName == printname
&& netPrinters.Active == NoYesCombo::Yes ;
//here i am passing printer name
reportRunController.parmReportContract().parmPrintSettings().printerName(netPrinters.PrinterName);
reportRunController.parmExecutionMode((SysOperationExecutionMode::Synchronous));
reportRunController.startOperation();
[/code]