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。
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谢谢您的回答！不是在sde上做，是personal geodatabase上，错误提示是：这个集合中找不到此项目！
我现在是学生，用的是破解版的。
如果是license的问题，您能给我发一份到邮箱吗？
我的程序是这样的：主界面上有个按钮，点击按钮会在personal geodatabase中生成一个注记类，现在程序能运行，点击按钮后会在那句代码停下了，提示错误就是：这个集合中找不到此项目！
error id我不知道从哪里看到啊，还麻烦您多指教！谢谢！
谢谢您!问题解决了,就是您说的license问题!
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你好！我也在做标注，但是我的代码在运行到pFWSAnno.CreateAnnotationClass(Name, pFields, pOCDesc.InstanceCLSID, pOCDesc.ClassExtensionCLSID, srcFeatureClass.ShapeFieldName, "", null, null, pAnnoPropsColl, pGLS, pSymbolColl, true);这句时就会报错，说：在这个集合项目中找不到该项。大概就是这个意思了，请问这是什么原因阿？
谢谢赐教！