vb.net qr code open source EXTENSIONS in VB.NET

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CHAPTER 12 EXTENSIONS
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throw new InvalidProgramException("No connection string available"); // Insert a record into the Lead table LeadDataDataContext dc = new LeadDataDataContext(ext.ConnectionString); dc.Leads.InsertOnSubmit(l); dc.SubmitChanges(); // Store the request in the OutArgument Lead.Set(context, l); } } }
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Updating the Application
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Now open the LeadGeneratorWF.cs class and remove the ConnectionString argument. You ll also need to delete the code that passes this to the CreateLead activity. In the code snippet shown in Listing 12-3, the lines to be deleted are in bold.
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Listing 12-3. Code Snippet from EnterLead public sealed class EnterLead : Activity { // Define the input and output arguments public InArgument<string> ContactName { get; set; } public InArgument<string> ContactPhone { get; set; } public InArgument<string> Interests { get; set; } public InArgument<string> Notes { get; set; } public InArgument<string> ConnectionString { get; set; } public InArgument<int> Rating { get; set; } public EnterLead() { // Define the variables used by this workflow Variable<Lead> lead = new Variable<Lead> { Name = "lead" }; // Define the SendRequest workflow this.Body = () => new Sequence { DisplayName = "EnterLead", Variables = { lead }, Activities = { new CreateLead { ContactName = new InArgument<string> (env => ContactName.Get(env)), ContactPhone = new InArgument<string>
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CHAPTER 12 EXTENSIONS
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(env => ContactPhone.Get(env)), Interests = new InArgument<string> (env => Interests.Get(env)), Notes = new InArgument<string>(env => Notes.Get(env)), ConnectionString = new InArgument<string> (env => ConnectionString.Get(env)), Lead = new OutArgument<Lead>(env => lead.Get(env)), }, Finally, in the AddLead.xaml.cs file, in the btnAddLead_Click() method, remove the following line that adds the connection string to the Dictionary object: parameters.Add("ConnectionString", _connectionString); Run the application to make sure everything still works correctly. As you modify this application in subsequent chapters, you ll create other custom activities that will need to access the database. With this simple extension, you now have a convenient way of providing it to any activity that needs it.
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Participating in Persistence
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The next custom extension that you ll develop will be designed to participate in the persistence process. You ll create an extension called CommentExtension, which allows the workflow to log comments throughout the processing of the workflow.
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In the Solution Explorer, right-click the Extensions folder and choose Add Class. Enter the class name as CommentExtension.cs. The implementation of this class is shown in Listing 12-4.
Listing 12-4. Implementation of CommentExtension.cs using using using using System; System.Activities.Persistence; System.Collections.Generic; System.Xml.Linq;
namespace LeadGenerator { public class CommentExtension : PersistenceParticipant { private string _comments = ""; public string Comments { get { return _comments; } } internal void AddComment(string s) { if (_comments.Length > 1) _comments += "\r\n";
CHAPTER 12 EXTENSIONS
this._comments += s; } protected override void CollectValues (out IDictionary<XName, object> readWriteValues, out IDictionary<XName, object> writeOnlyValues) { readWriteValues = new Dictionary<XName, object>(1) { { "Comment", this._comments } }; writeOnlyValues = null; } protected override void PublishValues (IDictionary<XName, object> readWriteValues) { object loadedData; if (readWriteValues.TryGetValue("Comment", out loadedData)) { this._comments = (string)loadedData; } }
This first part of this class is fairly straightforward. It has a single private class member to store the comment and a public method to return the comment. The AddComment() method is used to append the input string to the existing comment adding a carriage return/line feed to separate the comments.
PersistenceParticipant
The remaining methods are needed so this class can override the PersistenceParticipant methods. These methods will be called by the WorkflowApplication when it is being persisted or loaded. When the instance is being persisted, the CollectValues() method is called to obtain a Dictionary object that contains the data that the extension wants persisted. When the workflow is loaded from the database, this object is then provided back to this extension in the PublishValues() method. In this class, the CollectValues() method returns a Dictionary with a single entry; the _comments string. When it is passed to the PublishValues() method, it is extracted from the Dictionary and stored in the _comments member.
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