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要素类的复制方法
转自原文 要素类的复制方法
如何根据一个要素类(源要素类)在另一个工作空间中产生一个同字段,但空间范围可能不一致的要素类(目标要素类)?本文提供了完备的方法。
public ESRI.ArcGIS.Geodatabase.IFeatureClass CloneFeatureClass(ESRI.ArcGIS.Geodatabase.IFeatureClass srcFeatureClass, ESRI.ArcGIS.Geodatabase.IFeatureWorkspace SaveFeatWorkspace, string Name, ESRI.ArcGIS.Geometry.IEnvelope newEnvelope) { if (Name == ""||Name ==null) { Name = srcFeatureClass.AliasName; } Name = this.getRightDatasetName(Name, "."); IFields pFields = this.CloneFeatureClassFields(srcFeatureClass, newEnvelope); //Anno要素类 if (srcFeatureClass.FeatureType == esriFeatureType.esriFTAnnotation) { //Anno Workspace IFeatureWorkspaceAnno pFWSAnno =SaveFeatWorkspace as IFeatureWorkspaceAnno; //获得AnnoFeatureClass的显示参数units和referencescale IAnnoClass pAnnoClass = srcFeatureClass.Extension as IAnnoClass; IGraphicsLayerScale pGLS = new GraphicsLayerScaleClass(); pGLS.Units = pAnnoClass.ReferenceScaleUnits; pGLS.ReferenceScale = pAnnoClass.ReferenceScale; ISymbol pSymbol = (ISymbol)MakeTextSymbol(); //Anno要素类必须有的缺省符号 ISymbolCollection2 pSymbolColl = new SymbolCollectionClass(); ISymbolIdentifier2 pSymID = new SymbolIdentifierClass(); pSymbolColl.AddSymbol(pSymbol, "Default", out pSymID); //Anno要素类的必要属性 IAnnotateLayerProperties pAnnoProps = new LabelEngineLayerPropertiesClass(); pAnnoProps.CreateUnplacedElements = true; pAnnoProps.CreateUnplacedElements = true; pAnnoProps.DisplayAnnotation = true; pAnnoProps.UseOutput = true; ILabelEngineLayerProperties pLELayerProps = (ILabelEngineLayerProperties)pAnnoProps; pLELayerProps.Symbol = pSymbol as ITextSymbol; pLELayerProps.SymbolID = 0; pLELayerProps.IsExpressionSimple = true; pLELayerProps.Offset = 0; pLELayerProps.SymbolID = 0; IAnnotationExpressionEngine aAnnoVBScriptEngine = new AnnotationVBScriptEngineClass(); pLELayerProps.ExpressionParser = aAnnoVBScriptEngine; pLELayerProps.Expression = "[DESCRIPTION]"; IAnnotateLayerTransformationProperties pATP = (IAnnotateLayerTransformationProperties)pAnnoProps; pATP.ReferenceScale = pGLS.ReferenceScale; pATP.ScaleRatio = 1; IAnnotateLayerPropertiesCollection pAnnoPropsColl = new AnnotateLayerPropertiesCollectionClass(); pAnnoPropsColl.Add(pAnnoProps); IObjectClassDescription pOCDesc = new AnnotationFeatureClassDescription(); return pFWSAnno.CreateAnnotationClass(Name, pFields, pOCDesc.InstanceCLSID, pOCDesc.ClassExtensionCLSID, srcFeatureClass.ShapeFieldName, "", null, null, pAnnoPropsColl, pGLS, pSymbolColl, true); } else { return SaveFeatWorkspace.CreateFeatureClass(Name, pFields, null, null, esriFeatureType.esriFTSimple, srcFeatureClass.ShapeFieldName, ""); } }
方法中的两个函数,一个getRightDatasetName是解析要素类名称,即能够将诸如SDE.FC转换为FC。另一个方法CloneFeatureClassFields则是将一个要素类的Fields提取出来。
要素类的复制方法
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