在做CAD注记转GIS注记，坎坷，百度了几乎所有可能的资料。

主要参照这里的方法（c++）。我使用C#重写了，均测试通过。

http://www.cnblogs.com/junyuz/archive/2011/09/01/2162625.html

 

重要提示：

       必须创建好注记图层，设置好比例尺和坐标系。困在这里两天没通过。

 

 

方法一 通过IFDOGraphicsLayer添加Elements的方式实现

/// 
        /// 添加到注记图层        /// 
        /// 注记图层        /// 插入的位置:一般是一个IPoint        /// 
             protected bool InsertAnnoFea(IFeatureClass pFeatCls, IGeometry pGeometry)        {            IFeatureClass annocls = pFeatCls;            IDataset pDataset = annocls as IDataset;            ITransactions pTransactions = pDataset.Workspace as ITransactions;            pTransactions.StartTransaction();            IFDOGraphicsLayerFactory pFDOGLFactory = new FDOGraphicsLayerFactoryClass();            ILayer tmpLayer = pFDOGLFactory.OpenGraphicsLayer(pDataset.Workspace as IFeatureWorkspace, annocls.FeatureDataset, pDataset.Name);            IFDOGraphicsLayer pFDOGLayer = tmpLayer as IFDOGraphicsLayer;            IElementCollection pElementColl = new ElementCollectionClass();            pFDOGLayer.BeginAddElements();            ITextElement pTextElement = AnnoUtil.MakeTextElement(text, dHSize, rgbColor, sHFont, dHAngle) as ITextElement;            IElement pElement = pTextElement as IElement;            pElement.Geometry = pGeometry;            pElementColl.Add(pElement, 0);            pFDOGLayer.DoAddElements(pElementColl, 0);            pFDOGLayer.EndAddElements();            pElementColl.Clear();            pTransactions.CommitTransaction();            return true;        }

 

方法二 通过IAnnotationFeature来实现

/// 
        /// 添加到注记图层        /// 
        /// 注记图层        /// 插入的位置:一般是一个IPoint        /// 
             protected bool InsertAnnoFea2(IFeatureClass pFeatCls, IGeometry pGeometry)        {            IFeatureClass annocls = pFeatCls;            IWorkspace workspace = ((IDataset)annocls).Workspace;            IWorkspaceEdit workspaceEdit = workspace as IWorkspaceEdit;            bool startEdit = workspaceEdit.IsBeingEdited();            if (!startEdit)            {                workspaceEdit.StartEditing(false);            }            workspaceEdit.StartEditOperation();            ITextElement pTextElement = AnnoUtil.MakeTextElement(text, dHSize, rgbColor, sHFont, dHAngle) as ITextElement;            IElement pElement = pTextElement as IElement;            pElement.Geometry = pGeometry;            IFeature pFeature = annocls.CreateFeature();            IAnnotationFeature pAnnoFeature = pFeature as IAnnotationFeature;            pAnnoFeature.Annotation = pElement;            pFeature.Store();            workspaceEdit.StopEditOperation();            workspaceEdit.StopEditing(true);            return true;        }

：这两种方法，经过实际测试都可以成功，在导入的时候还需要注意一下空间参考系的问题，需要对应上，特别要注意dwg中的数据是否正确，如果注记的坐标不在参考系范围内，会出现导入失败的现象，我就是因为这个低级的错误，纠结了两天。

 

ps. MakeTextElement是创建ITextElement的方法。

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原文：http://www.cnblogs.com/GISRSMAN/p/4549444.html