In other words, you need to write an event handler that calls your CheckDriversLicense method. The event handler method receives a parameter of the type, dataeventArgs. The event handler can set a value in the dataeventArgs structure to accept or reject the record. After you write your event handler method, you connect it to the event by assigning, or adding it to the OnValidatedWrite delegate that is a member of the fmrental table. You write this assignment in the init method of the data source of the fmrental form. This assignment to a delegate might seem odd. After all, we're modifying existing code (fmrental) to add handlers, which contradicts the main value proposition of loose coupling that eventing is supposed to offer.
Module: Operations, management (BEM2007) - university
Then, pdf a query is created with a where clause that designates the requested customer by recId. The call to the firstOrDefault method forces execution of the query. The method assigns the single matching customer to the customer variable. (Null is assigned if the recId value matches no customer.) Finally, the customer data is tested to see if the associated driver's license is valid. (Does the license contain "89"?) Handle the event when a record is added The following subsections provide the following: Explain the upcoming code items and their inter-relationships. Show the code for an event handler. Associate the handler with the event occurrences. Preparatory overview When an attempt is made to add a record to a table, the OnValidateWrite event is raised by dynamics ax before the record is written to the database. You want your CheckDriversLicense method to be called each time on the OnValidateWrite event is raised for the fmrental table. To do this, you now need to write a c method that is invoked by the event, and which calls your checkDriversLicense method.
In the demo data, this is true for Adrian Lannin, / but not for Phil Spencer. Return ntains 89 understand the linq code before proceeding with more C code, verify that you understand the linq code you just added. More details about linq are provided in the technical Concepts guide, so only the basics are described below. First, a provider is created. It provides access to all the microsoft desk Dynamics ax tables. Next, a collection of all customers is created. The customer of interest is retrieved from this collection.
Using System; using neric; using nq; using System. Tasks; namespace DriversLicenseevaluator using. Xpp; public class DriversLicenseChecker replace report the class CheckDriversLicense with the following code. Tip : If you prefer, you can paste in the code from the file in the C:fmlab directory. Public class DriversLicenseChecker public static bool CheckDriversLicense(long customerId) / Use linq to get back to the information about the license number fmcustomer customer; queryProvider provider new axqueryProvider(null var customers new / build the query (but do not execute it) var query from c in customers. Return false; / Call the dot web writing service to validate the license number. This is not practical for this lab, because all the service providers / charge for this service. Instead, just assume that any license number / that contains the sequence "89" is valid.
Click Browse again, and then type the following file name into the field: pport. Dll Click Add, and then click. The assemblies now appear under the references node in the project. Repeat the Add Reference process, except this time, add the following dll file from the indicated path:.FleetManagement. Dll, in C:PackagesFleetManagementbin In Solution Explorer, select the reference. FleetManagement.dll reference and set the property copy local false. In Solution Explorer, right-click, and then click view Code. Add the following three using statements to the DriversLicenseevaluator namespace, to reduce the verbosity of code that references external classes. Xpp; your C code should now look something like the following example.
The method must validate the drivers license. To do this, the method must retrieve the drivers license number, which is stored in the customer table. The method is given the recId value writing for the customer record that contains the information required by the method. Your C code uses the dynamics ax linq provider to read from the customer table. For linq to work, you must first add references pointing to the linq assemblies. You environment add these references to the C project named DriversLicenseevaluator. In Solution Explorer, expand the DriversLicenseevaluator project node, right-click references, and then click Add Reference.
Click Browse and then enter the following path: C:Packagesbin In some environments, the location of the packages folder is not on the c: drive. In the file name field, type the pattern *linq*.dll and then press Enter. You'll see a list of assemblies with the name linq in them. From that list, select the following files, and then click Add :. Dll you must also add the support assemblies that contain the common type that you'll use in the code below.
If the solution file is not on your computer, the steps to create it are listed. Tutorial: Create a fleet, management solution file out of the Fleet. Management models in the aot. Right-click the FleetManagement solution, and then click Add new Project. The Add New Project dialog is displayed.
In the left pane, click visual C, and then in the middle pane, click Class Library. At the bottom in the name text box, type the name DriversLicenseevaluator. In the location text box, type the following directory path. Verify that your project is set. Net framework.5 in the drop-down list at the top. Click ok to create the project. In Solution Explorer, under the DriversLicenseevaluator project, right-click the file name and rename. Click yes, when prompted to rename all references to the class. Write a c method named CheckDriversLicense In this section, you add C code for a method named CheckDriversLicense.
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The C project is built before the dynamics ax project that references and write depends. The dynamics ax infrastructure understands the references, and will make sure that the C assemblies are deployed correctly to the cloud before execution. Follow these steps to create a c class library in the Fleet. Management solution: In Visual Studio, click, file open project/solution. In the, open Project dialog box, in the. File name text box, type the following path, and then press. Select the file named n, and then click.
these tools make the development effort easy. The obvious choice would be to leverage visual Studio to write the code. However, in this tutorial your code wont actually call an external service, because the logistics are beyond the scope of the simple lab environment. Instead, we provide a mock implementation of a service call. The goal of this tutorial is to teach an understanding of the current state of C and of interoperability with. Create a c class library, dynamics ax enables you to create a reference from a dynamics ax project to the C class library, or to any other type of C project that generates an assembly. Such references affect the build order.
Load symbols only for items in the solution check box is selected. Since this option is selected by default, it must be changed prior to running the lab. In Visual Studio, click. Dynamics ax options, and clear the, load symbols only for items in the solution check box. Scenario, too many cars have been rented to drivers who have a history of unsafe driving habits. Management rental company needs to check driving records from external really sources. Upper management has decided to subscribe to a service that is hosted by the department of Transportation (dot which is the legal entity that manages drivers licenses and associated information.
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Contributors, the primary goal of this tutorial is to illustrate the interoperability between C and x in Microsoft Dynamics. In this tutorial, youll write business logic in C source code and in X lab source code. You'll get experience with the following: New tools in Visual Studio. The handling of events in C. The use of Language Integrated query (linq) in C to fetch data. Prerequisite, this tutorial requires that you access the dynamics ax environment using Remote desktop, and be provisioned as an administrator on the dynamics ax instance. Note : Debugging support for the C project does not work if the.