c# data matrix EMPLOYEE PERFORMANCE REVIEW APPLICATION in Visual C#.NET

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CHAPTER 10 EMPLOYEE PERFORMANCE REVIEW APPLICATION
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handle. Create a new VB Class Library project called EPRService, placing this within the VBEmployeePerformanceReview folder. When the project is added, change the name of Class1.vb to IEPRService.vb within the Solution Explorer. Next, add a reference to System. Workflow.Activities by right-clicking the EPRService project in the Solution Explorer and choosing Add Reference. When the Add Reference form appears under the .NET tab (the default tab), find and select System.Workflow.Activities and click OK. Open the IEPRService.vb file and change the code to the following: Imports System Imports System.Workflow.Activities <ExternalDataExchange()> _ Public Interface IEPRService End Interface The first two lines import the necessary namespaces. Remember the <ExternalDataExchange()> _ line defines this as an interface that exchanges data with other applications. Add a new class to the EPRService project called EPREventArgs. Open the new class and replace the default code with the following: Imports System Imports System.Workflow.Activities <Serializable()> _ Public Class EPREventArgs Inherits ExternalDataEventArgs Private IntReviewID As Integer Public Property ReviewID() As Integer Get Return IntReviewID End Get Set(ByVal value As Integer) IntReviewID = value End Set End Property Public Sub New(ByVal InstanceID As Guid, ByVal ReviewID As Integer) MyBase.New(InstanceID) IntReviewID = ReviewID End Sub End Class Again, the first two lines just import the necessary namespaces. The <Serializable()> _ attribute tells the .NET Framework to serialize this class. This class also inherits from ExternalDataEventArgs and must have a New sub within it. That New sub must call the New sub of the base class (ExternalDataEventArgs). The New sub for this class accepts two parameters. The first is the instance ID of the workflow that is to be used, and the second is the ReviewID of the review this instance of the workflow is to work with. Now you need to define the events for the interface file. There will be four events representing the four different state shifts that can occur. The first is EmployeeToSupervisor, which is called anytime the review is sent from the employee to the supervisor. The second is SupervisorToEmployee, which is called anytime the review is sent from the supervisor to the
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CHAPTER 10 EMPLOYEE PERFORMANCE REVIEW APPLICATION
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employee. The third is EmployeeApproved, which is called when the employee approves the review. Finally, EmployeeNotApproved is called if the employee doesn t approve the final version of the review. Open IEPRService if it isn t already opened. Add the following code to the interface so the interface code looks like this: Imports System Imports System.Workflow.Activities <ExternalDataExchange()> _ Public Interface IEPRService Event EmployeeToSupervisor As EventHandler(Of EPREventArgs) Event SupervisorToEmployee As EventHandler(Of EPREventArgs) Event EmployeeApproved As EventHandler(Of EPREventArgs) Event EmployeeNotApproved As EventHandler(Of EPREventArgs) End Interface Now you must create the actual class that implements the interface. Add a new class called EPRService to the EPRService project. On the next line after the class declaration for EPRService, add Implements IEPRService. This automatically generates an event handler for each of the events defined in the interface. The resulting EPRService class looks like this: Public Class EPRService Implements IEPRService Public Event EmployeeToSupervisor(ByVal sender As Object, ByVal e As EPREventArgs) Implements IEPRService.EmployeeToSupervisor Public Event EmployeeApproved(ByVal sender As Object, ByVal e As EPREventArgs) Implements IEPRService.EmployeeApproved Public Event EmployeeNotApproved(ByVal sender As Object, ByVal e As EPREventArgs) Implements IEPRService.EmployeeNotApproved Public Event SupervisorToEmployee(ByVal sender As Object, ByVal e As EPREventArgs) Implements IEPRService.SupervisorToEmployee End Class After you ve defined the events, you need to create subs to raise the events to the workflow. Add the following code immediately after Implements IEPRService (before the previous code): Private e As EPREventArgs Public Sub RaiseEmployeetoSupervisor(ByVal ReviewID As Integer, ByVal InstanceId As Guid) e = New EPREventArgs(InstanceId, ReviewID) RaiseEvent EmployeeToSupervisor(Me, e) End Sub Public Sub RaiseSupervisorToEmployee(ByVal ReviewID As Integer, ByVal InstanceID As Guid) e = New EPREventArgs(InstanceID, ReviewID) RaiseEvent SupervisorToEmployee(Me, e) End Sub
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