Today I am going to share very interesting topics on Dynamics NAV 2016. Since year 2012 I am looking try catch function in Dynamics NAV, I am sure all of Dynamics NAV developers are seeking same function in Dynamics NAV. I notice in Navision 2016 has introduced Try Function to handle errors. Let’s discuss Dynamics NAV error handling using Try Function.

Try functions in C/AL let you to handle errors that occur in the application during code execution. For instance, with try functions, you can provide user-friendly error messages to the end user than the ugly system messages. You can use try functions to catch exceptions that are thrown by  Dynamics NAV

Important thing you need to be remembered. It does requires that write transactions are committed to the database.

Try Function Behavior and Usage

Before start you should read NAV Design Patterns Try Function article in MSDN.

To explain this Try Function I will create new codeunit. Create a function called AddCustomer. Parameters should be CustomerNo and CustomerName. CustomerCode should be Code type variable and CustomerName should be Text type variable. Also you need to enable TryFucntion Yes.  Using simple steps you can enable it. Go to properties of AddCustomer function then you will find the TryFunction property.

After that you need to write few code inside the AddCustomer function and On Run trigger. Let’s have a look.

LOCAL [TryFunction] AddCustomer(CustomerNo : Code[30];CustomerName : Text[50])
Customer.INIT;
Customer.”No.” := CustomerNo;
Customer.Name := CustomerName;
Customer.INSERT;

On Run trigger you can call the AddCustomer function.

OnRun()
//Call AddCustomer Function
CLEARLASTERROR;
IF AddCustomer(‘C02511′,’Try Customer Name’) THEN
MESSAGE(‘Submitted’)
ELSE
MESSAGE(‘AddCustomer Function has return’ + GETLASTERRORCODE,GETLASTERRORTEXT);

When you run your codeunit. You will get your first message which is Submitted. All fine. When you run it again you will get proper message. Which is AddCustomer Function has return ERROR The Customer already exists. Identification fields and values: No.=’C02511′ – DB:RecordExists

Obiously you will get some confusions and you might get some questions. Hope you will post your queries and comments.

The post Dynamics NAV Error Handling using Try Function appeared first on Shan Abeywickrama | Dynamics NAV & Business Central Insights.

So may be you love if we have Try Catch statement to capture the errors. But we can have simple way to handle some error,

Mostly we are facing run time errors. For instance , you will have a calculation like  AvgAmt := LineAmt / TotalValue  ,What happens if TotalValue is zero ? Yes of course you will get an error which may you mostly familiar Divided by zero error.

So how we are going to handle these type of run time errors, Let me tell you some interesting thing, You can use IF condition to handle this type of errors, For instance, simply you can check if the Totavalue is 0 or not. If it is not 0 you can allow the calculation else you can  assign default value to the TotalValue. Here is the example,

IF TotalValue <> 0 THEN
    AvgAmt := LineAmt / TotalValue
ELSE
AvgAmt := 0;

Sometimes you may have used GET Function to retrieve values. You already know how to use  GET Function, But sometime you will get error, for instance, Customer “” does not exist  something smiler to this, So what we have to do is we need to keep the get function with IF condition.

IF NOT (Customer.GET(“C001”)) THEN CLEAR(Customer);

So now you know, using simple IF condition we can handle run time errors  in some area in Dynamics NAV.

The post Better error handling using IF Condition in Dynamics NAV appeared first on Shan Abeywickrama | Dynamics NAV & Business Central Insights.