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In the previous chapters, the user data consisted of a single table: Lead. When an agent was assigned to a lead, the AssignedTo column was populated with the agent s name. In this chapter you ll add an Assignment table so additional details about the assignment can be stored as well. The Lead.sql that you just executed created both the Lead and Assignment tables. It also set up a foreign key relationship between these two tables.
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Open the LeadData.dbml file, which should display the O/R Designer. In the Server Explorer, expand the 14 data connection. Drag the Assignment table to the design surface. The designer should look like the one shown in Figure 14-2.
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CHAPTER 14 TRANSACTIONS
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Figure 14-2. O/R Designer with the added Assignment table The connection between the Assignment and Lead tables is because of the foreign key relationship that was set up in the database schema. By default, the O/R Designer creates a two-way association. The Assignment class will have a property to reference the associated Lead object. The Lead class will also have a property that is a collection of Assignment objects. For this project you do not want the Lead class to have a collection of Assignment objects. Because the Lead class is used as a variable in the workflow definition, when the workflow is persisted, the Lead class will be serialized and written to the InstancesTable. The Assignment collection is not serializable, and this will generate errors. To resolve it, click the association link in the O/R Designer. In the Properties window, select the Child Property and set its value to False, as shown in Figure 14-3.
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Figure 14-3. The Properties window of a LINQ Association
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AssignLead Activity
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In the current application, when an agent is assigned, the application updates the Lead table to store the agent s name. This is implemented in the btnAssign_Click event handler. Now you ll move it to a custom activity. From the Solution Explorer, right-click the Activities folder of the LeadGenerator project and choose Add Class. For the class name, enter AssignLead.cs. The implementation for this class is shown in Listing 14-1. Listing 14-1. Implementation of the AssignLead activity using using using using using using using System; System.Activities; System.Configuration; System.Activities.Tracking; System.Linq; System.Data.Linq; System.Transactions;
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namespace LeadGenerator { /*****************************************************/ // This custom activity assigns Lead to the specified // person (AssignedTo parameter). The updated Lead is // returned in the output parameter. /*****************************************************/ public sealed class AssignLead : NativeActivity { public InArgument<string> AssignedTo { get; set; } public OutArgument<Lead> Lead { get; set; } protected override void Execute(NativeActivityContext context) {
CHAPTER 14 TRANSACTIONS
// Get the connection string DBExtension ext = context.GetExtension<DBExtension>(); if (ext == null) throw new InvalidProgramException("No connection string available"); // Query the Lead table LeadDataDataContext dc = new LeadDataDataContext(ext.ConnectionString); dc.Refresh(RefreshMode.OverwriteCurrentValues, dc.Leads); Lead l = dc.Leads.SingleOrDefault<Lead> (x => x.WorkflowID == context.WorkflowInstanceId); if (l == null) throw new InvalidProgramException ("The Lead was not found in the database"); l.AssignedTo = AssignedTo.Get(context); l.Status = "Assigned"; // Enlist on the current transaction RuntimeTransactionHandle rth = new RuntimeTransactionHandle(); rth = context.Properties.Find(rth.ExecutionPropertyName) as RuntimeTransactionHandle; if (rth != null) { Transaction t = rth.GetCurrentTransaction(context); dc.Connection.EnlistTransaction(t); } dc.SubmitChanges(); // Store the request in the OutArgument Lead.Set(context, l); } } } The AssignLead activity takes an input argument, AssignedTo that specifies the name of the agent being assigned. It provides an output argument, Lead, which is the updated Lead record. The Execute() method uses the DBExtension to get the correct connection string (refer to 12 for an explanation). It then queries the Lead table to get the current record. Notice that there is no input argument to indicate which lead is being assigned. The query can obtain the correct record by using the WorkflowInstanceID that is provided in the NativeActivityContext class.
Tip LINQ to SQL has a tendency to cache database records for better performance. To ensure that you get the current data, the Refresh() method of the data context class is called.
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