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CHAPTER 8 WORKFLOW RULES
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else { return activity; } } The last piece of this section of the solution is to build the custom property editors for the DocumentLibrary and RuleSetName properties. I m only going to cover these pieces at a pretty high level because they re really not related to workflow rules. Listing 8-12 shows the full class for the first editor, used by the DocumentLibrary property. It is all SharePoint development 101 grab the document libraries and present them in a list box; nothing special there. The rest of the code is mandated by the custom property editor. Listing 8-12. The Custom Property Editor for the DocumentLibrary Property public class docLibSelector : UITypeEditor { IWindowsFormsEditorService frmEditor = null; public override UITypeEditorEditStyle GetEditStyle( ITypeDescriptorContext context) { return UITypeEditorEditStyle.DropDown; } public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) { ExternalPolicy parent = (ExternalPolicy)context.Instance; string sSourceSiteURL = parent.SourceSiteURL; if (sSourceSiteURL != null) { frmEditor = (IWindowsFormsEditorService) provider.GetService( typeof(IWindowsFormsEditorService)); ListBox lbDocLibs = new ListBox(); SPSite site = new SPSite(sSourceSiteURL); SPWeb web = site.OpenWeb(); foreach (SPDocumentLibrary dl in web.GetListsOfType( SPBaseType.DocumentLibrary)) { lbDocLibs.Items.Add(dl.Title); }
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CHAPTER 8 WORKFLOW RULES
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lbDocLibs.SelectedValueChanged += new EventHandler(lbDocLibs_SelectedValueChanged); frmEditor.DropDownControl(lbDocLibs); return lbDocLibs.SelectedItem; } else { MessageBox.Show(@"You must specify a Source Site URL first!"); return null; } } void lbDocLibs_SelectedValueChanged(object sender, EventArgs e) { frmEditor.CloseDropDown(); } } The next custom editor is similar to the previous one. It handles the process of presenting the user with a list of valid rulesets to be utilized. A ruleset is considered valid for the current workflow if the name of the workflow containing the activity matches the value of the WorkflowName column in the document library. We ll cover setting that value to the proper value when we build the RuleSet Manager application in a bit. As before, the code for all of this is straightforward SharePoint development. We use an SPQuery object to filter our result set and loop through the SPListItemCollection to populate the list box. Listing 8-13 shows you this code. Listing 8-13. The Custom Property Editor for the RuleSetName Property public class RuleSetSelector: UITypeEditor { IWindowsFormsEditorService frmEditor = null; public override UITypeEditorEditStyle GetEditStyle( ITypeDescriptorContext context) { return UITypeEditorEditStyle.DropDown; } public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) { ExternalPolicy parent = (ExternalPolicy)context.Instance; string sSourceSiteURL = parent.SourceSiteURL; string sDocLibName = parent.DocumentLibrary;
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CHAPTER 8 WORKFLOW RULES
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if ( (sSourceSiteURL != null) && (sDocLibName != null) ) { frmEditor = (IWindowsFormsEditorService) provider.GetService( typeof(IWindowsFormsEditorService)); ListBox lbRuleSets = new ListBox(); SPSite site = new SPSite(sSourceSiteURL); SPWeb web = site.OpenWeb(); SPDocumentLibrary dl = (SPDocumentLibrary) web.Lists[sDocLibName]; CompositeActivity workflow = Utility.GetRootWorkflow(parent.Parent); SPQuery qry = new SPQuery(); qry.Query = string.Format( @"<Where><Eq><FieldRef Name='WorkflowName' /> <Value Type='Text'>{0}</Value></Eq></Where>", workflow.QualifiedName); SPListItemCollection lic = dl.GetItems(qry); if (lic.Count > 0) { foreach (SPListItem li in lic) { lbRuleSets.Items.Add( Path.GetFileNameWithoutExtension(li.File.Name)); } } lbRuleSets.SelectedValueChanged += new EventHandler(lbRuleSets_SelectedValueChanged); frmEditor.DropDownControl(lbRuleSets); return lbRuleSets.SelectedItem; } else { MessageBox.Show(@"You must specify a Document Library first!"); return null; } }
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CHAPTER 8 WORKFLOW RULES
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void lbRuleSets_SelectedValueChanged(object sender, EventArgs e) { frmEditor.CloseDropDown(); } }
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Note I won t walk through building the auxiliary classes for our activity the Designer, toolbox item, etc. We covered that in 5 so there s little reason to rehash it here. In my copious spare time, I ll be wrapping up all of the code from the book and posting it on my web site so you can go there to grab it all if you re interested in the final product: www.kcdholdings.com.
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That s it. Build and deploy the activity as we did in 5 and we re ready to move onto the RuleSet Manager application.
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Rule Management
Ruleset management is the other half of our solution. For this we ll be building a Windows Forms application. Before getting to the code, I ll walk you through the functionality provided by the application so that the source code makes a little more sense. At a high level, the functionality of this application is as follows: 1. Allow the user to select which workflow template they wish to create a ruleset for. The list of available templates is filtered to only show those that make use of our ExternalPolicy activity. 2. Once the user has selected a template, allow them to either select an existing ruleset to edit or create a new ruleset. The names of existing rulesets are retrieved from a SharePoint document library. 3. Present the Rule Set Editor provided by Microsoft to manage the rules and ruleset properties. 4. Save the ruleset back to our SharePoint document library. Only two screens make up the user interface for our solution and one of them is provided by Microsoft so we need to create only one. Figure 8-9 shows the form we ll be building. The other form is the Rule Set Editor provided by Microsoft and shown back in Figure 8-8.
Note As I mentioned while we were building the ExternalPolicy activity, each ruleset is going to be manipulating member variables of a given workflow template. Therefore, the ruleset is tightly bound to that specific workflow template s Type. We re trying to hide some of the ugliness of types and members from our users, so we ll do all of that work in the background. All we need them to do is select the workflow template for which they wish to build a ruleset.
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