Chap06ArcObjects开发Chap06空间数据可视化表达.ppt

Defining RepresentationClass The workspace extension for managing representation classes is called RepresentationWorkspaceExtension. The IRepresentationWorkspaceExtension interface has a method called?CreateRepresentationClass?that can be used to create new representation classes. Creating feature class representations?on a feature class results in the addition of two new fields：RuleID (fieldtype long to store RepresentationRule ID value) and Override (fieldtype binary large object (BLOB) to store feature-specific override information).?A reference to a new or existing RepresentationRules?must be present to create a new representation class.? IRepresentationWorkspaceExtension public IRepresentationClass CreateRepresentationClass ( IFeatureClass FeatureClass, ???? string Name, ???? string ruleIDFldName, ???? string overrideFldName, ???? bool RequireShapeOverride, ???? IRepresentationRules Rules, ???? IGraphicAttributes ClassAttributes ); public IRepresentationWorkspaceExtension GetRepWSExt (IWorkspace pWorkspace) { IWorkspaceExtensionManager pExtManager = pWorkspace as IWorkspaceExtensionManager; UID pUID = new UID(); pUID.Value = {FD05270A-8E0B-4823-9DEE-F149347C32B6}; IRepresentationWorkspaceExtension repWorkspaceExt = pExtManager.FindExtension(pUID) as IRepresentationWorkspaceExtension; return repWorkspaceExt; } The?GUID value for?representation workspace?extension public IRepresentationClass CreateRepClass( IFeatureClass pFClass) { IDataset pDataset = pFClass as IDataset; IWorkspace pWorkspace = pDataset.Workspace; IRepresentationWorkspaceExtension pRepWSExt = GetRepWSExt(pWorkspace); IRepresentationRules pRules = new RepresentationRulesClass (); IRepresentationClass repClass = pRepWSExt.CreateRepresentationClass(pFClass, pFClass.AliasName + _Rep, RuleID, Override, false, pRules, null); return repClass; } Sample: Create a custom