qr code generator for c# Using the BDC API with a WF workflow in C#.NET

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Using the BDC API with a WF workflow
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The isProductinstock activity reads the property values to cross reference the product number and the number of items in stock, as shown in listing 8.11.
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Listing 8.11
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isProductInStock method
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private void isProductInStock(object sender, ConditionalEventArgs e) { // Get the SPList item for the Workflow SPListItem spListItem = workflowProperties.Item; // Parse the Order Quantity from the List Items Quantity Field int orderQuantity = int.Parse(spListItem.GetFormattedValue("Quantity")); // Set the SQL Provider SetProviderToServerContext(); // Impersonate the current windows user WindowsIdentity.GetCurrent().Impersonate(); // Get the Product field from the SPListItem BusinessDataField productField = (BusinessDataField)spListItem.Fields["Product"]; // Get the Current Stock Level as String from the BDC string currentStockLevelAsString = GetEntityColumnValue(productField, ProductID, "StockLevel"); // Parser the current Stock Level as Int int currentStockLevel = int.Parse(currentStockLevelAsString); e.Result = orderQuantity <= currentStockLevel; return; }
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DEBUGGING THE WORKFLOW
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You can easily debug a Visual Studio workflow by setting the SharePoint debugging options. A wizard is triggered by right-clicking the Project file and choosing SharePoint Debug settings. You can then input the name of the workflow as it ll show up in SharePoint, as well as the site you wish to use to perform the debugging, as shown in figure 8.8. You can then set the SharePoint list or library to test the workflow in, as well as your History list and Task list, as shown in figure 8.9. It s recommended that you always create a new History list and write to it to test the different activities.
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The ApplicationRegistry namespace
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The SharePoint Debug settings
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Using the BDC API with a WF workflow
AUTHOR THE FEATURE FOR THE WORKFLOW
The Feature.xml file is used to set properties for a feature, such as the ID, Title, Description, Scope, and so on. Listing 8.12 shows a typical Feature.xml file.
Listing 8.12 Feature.xml file for the workflow
<Feature Id="33c4dd00-c4dd-4786-9756-90083aa6338f" Title="BDCWorkflow feature" Description="My SharePoint Workflow Feature" Version="12.0.0.0" Scope="Site" ReceiverAssembly="Microsoft.Office.Workflow.Feature, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" ReceiverClass="Microsoft.Office.Workflow.Feature.WorkflowFeatureReceiver " xmlns="http://schemas.microsoft.com/sharepoint/"> <ElementManifests> <ElementManifest Location="workflow.xml" /> </ElementManifests> <Properties> <Property Key="GloballyAvailable" Value="true" /> <!-- Value for RegisterForms key indicates the path to the forms relative to feature file location --> <!-- if you don't have forms, use *.xsn --> <Property Key="RegisterForms" Value="*.xsn" /> </Properties> </Feature>
The Workflow.xml file is what s described as the elements file. This file describes exactly what the feature intends to do, where to find the assembly file, and which forms to use for the initiation form, status form, and so on. Listing 8.13 shows a typical Workflow.xml file.
Listing 8.13 Elements.xml file for workflow deployment
<Elements xmlns="http://schemas.microsoft.com/sharepoint/"> <Workflow Name="BDCWorkflow" Description="My SharePoint Workflow" Id="8f3726f9-a775-4b2c-81b2-5d652e3fbb1c" CodeBesideClass="BDCWorkflow.BDCWorkflow" CodeBesideAssembly="BDCWorkflow, Version=1.0.0.0, Culture=neutral, PublicKeyToken=570a2c350488292c"> <Categories/> <MetaData> <!-- Tags to specify InfoPath forms for the workflow; delete tags for forms that you do not have -->
The ApplicationRegistry namespace
<!--<Association_FormURN>[URN FOR ASSOCIATION FORM]</Association_FormURN> <Instantiation_FormURN>[URN FOR INSTANTIATION FORM]</Instantiation_FormURN> <Task0_FormURN>[URN FOR TASK (type 0) FORM]</Task0_FormURN> <Task1_FormURN>[URN FOR TASK (type 1) FORM]</Task1_FormURN>--> <!-- Modification forms: create a unique guid for each modification form --> <!--<Modification_[UNIQUE GUID]_FormURN>[URN FOR MODIFICATION FORM]</Modification_[UNIQUE GUID]_FormURN> <Modification_[UNIQUE GUID]_Name>[NAME OF MODIFICATION TO BE DISPLAYED AS A LINK ON WORKFLOW STATUS PAGE</Modification_[UNIQUE GUID]_Name> --> <StatusPageUrl>_layouts/WrkStat.aspx</StatusPageUrl> </MetaData> </Workflow> </Elements>
PACKAGE THE WORKFLOW INTO A WSP FOR EASY DEPLOYMENT
Though optional, this part of the process is very important. It means that, as a workflow developer, you can simply provide your administrator with a single WSP file that she can deploy via Stsadm. If for some reason the workflow is retired or causes a problem, it can be easily retracted by the administrator using the command line. We recommend WSP Builder, which is a free tool that will provide you with a DDF (Diamond Directive File) and WSP file.
Summary
Within this chapter, we explored each of the Business Data Catalog namespaces. We gave a code example that demonstrated the use of each, and also explained which namespaces are for internal use only. We then gave a working example true to a real-world requirement, which demonstrated using the namespaces to create a WCF web service that exposes data for use in other business-oriented applications such as OBA (Office Business Applications). Finally, we explored how to use the BDC data in a Visual Studio workflow, which allows your workflow to perform SharePoint actions such as create tasks based on conditions set within the backend LOB system. In chapter 9, we ll provide another example of using the BDC Object Model, which will involve using a call-back method and BDC to present data in a web part that refreshes automatically.
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