本文所指的CAD數據為不帶空間參考和擴展數據的數據。如果CAD帶了空間參考或是擴展屬性數據的話，就要采用圖形和屬性分離的方法轉CAD數據，即圖形轉完后需要掛接屬性數據庫。這里就不詳細說明了.

ArcGIS和CAD對空間數據的歸納有所不同，在AutoCad中，點線面可以在同一個圖層中，但是在ArcGIS中，點線面被嚴格的區分為了point、polyline和polygon三種類型的圖層，所以直接用ArcCatalog查看CAD數據時會看到五個圖層（點線面、注記和Multipatch）

話不多說了，進入主題吧

下面的方法實現了點線面圖層轉成Shape文件

代碼

 public bool CadDataToShape(string _cadFilePath)
 {        
            //工作空間         
            IWorkspaceFactory pWorkspaceFactory;
            IFeatureWorkspace pFeatureWorkspace;
            IFeatureLayer pFeatureLayer;
            IFeatureDataset pFeatureDataset;//圖層對應數據集
            
            ESRI.ArcGIS.ConversionTools.FeatureClassToFeatureClass feaTofea = new FeatureClassToFeatureClass();
            ESRI.ArcGIS.Geoprocessor.Geoprocessor pGeoPro = new ESRI.ArcGIS.Geoprocessor.Geoprocessor();

            try
            {
                string strFullPath = _cadFilePath;
                int index = strFullPath.LastIndexOf("\");
                string filePath = strFullPath.Substring(0, index);
                string fileName #p#分頁標題#e#= strFullPath.Substring(index + 1);
                string DataSaveFilePath=@"D:CADToShape";

                cadGISInfo = new stMdbInfo();
                cadGISInfo.mdbFeaturesName = new List<string>();
                cadGISInfo.mdbname = fileName;

                //打開cad數據集
                pWorkspaceFactory = new CadWorkspaceFactoryClass();
                pFeatureWorkspace = (IFeatureWorkspace)pWorkspaceFactory.OpenFromFile(filePath, 0);
                
                
                if (Directory.Exists(DataSaveFilePath + @"\" + fileName))
                {                  
                    DirectoryInfo dirInfo = new DirectoryInfo(DataSaveFilePath + @"\" + fileName);
                    foreach (FileInfo file in dirInfo.GetFiles())
                    {
                        file.Delete();
                    }
                   #p#分頁標題#e#
                    Directory.Delete(DataSaveFilePath + @"\" + fileName);
                }

                Directory.CreateDirectory(DataSaveFilePath + @"\" + fileName);

                cadGISInfo.mdbfilepath = DataSaveFilePath + @"\" + fileName;

                //打開一個要素集
                pFeatureDataset = pFeatureWorkspace.OpenFeatureDataset(fileName);

                IFeatureClassContainer pFeatureClassContainer = (IFeatureClassContainer)pFeatureDataset;
                //對CAD文件中的要素進行遍歷處理
                int count = pFeatureClassContainer.ClassCount;

                for (int j = 0; j < pFeatureClassContainer.ClassCount; j++)
                {
                    IFeatureClass pFeatClass = pFeatureClassContainer.get_Class(j);
                    cadGISInfo.mdbFeaturesName.Add(pFeatClass.AliasName+".shp");
                    if (pFeatClass.FeatureType == esriFeatureType.esriFTCoverageAnnotation || pFeatClass.FeatureType == esriFeatureType.esriFTAnnotation)
                    {#p#分頁標題#e#

                    }
                    else
                    {
                        feaTofea.in_features = strFullPath + @"\" + pFeatClass.AliasName;
                        feaTofea.out_path = DataSaveFilePath + @"\" + fileName;

                        feaTofea.out_feature_class = pFeatClass.AliasName;
                        feaTofea.out_name = pFeatClass.AliasName;
                        pGeoPro.Execute(feaTofea, null);
                    }
                }           
                return true;
            }
            catch
            {
                return false;
            }
            finally
            {
                pWorkspaceFactory = null;              
                pFeatureDataset = null;            
                pFeatureWorkspace = null;             
                GC.Collect();#p#分頁標題#e#
            }

        }

下面的方法實現CAD數據轉成本地的Personal Geodatbase，同時實現了注記圖層的轉換

代碼

public bool CadDataToGeodatabase(string _cadFilePath)
        {     
            //工作空間         
            IWorkspaceFactory pWorkspaceFactory;
            IFeatureWorkspace pFeatureWorkspace;
            IFeatureLayer pFeatureLayer;
            IFeatureDataset pFeatureDataset;//圖層對應數據集

            //創建MDB工作空間
            IWorkspaceFactory pAccessWorkSpaceFactory;

            //這個conversionTools不包含注記圖層的轉換
            ESRI.ArcGIS.ConversionTools.FeatureClassToFeatureClass feaTofea = new FeatureClassToFeatureClass();
            ESRI.ArcGIS.Geoprocessor.Geoprocessor pGeoPro = new ESRI.ArcGIS.Geoprocessor.Geoprocessor();
            //ImportCADAnnotation功能，實現導入注記圖層
            ESRI.ArcGIS.ConversionTools.ImportCADAnnotation importCADAnno = new ImportCADAnnotation();
            try
            {                #p#分頁標題#e#
                    string strFullPath = _cadFilePath;
                    int index = strFullPath.LastIndexOf("\");
                    string filePath = strFullPath.Substring(0, index);
                    string fileName = strFullPath.Substring(index + 1);
                    string DataSaveFilePath=@"D:CADToMDB";

                    cadGISInfo= new stMdbInfo();
                    cadGISInfo.mdbFeaturesName = new List<string>();
                    cadGISInfo.mdbname = fileName;
                    //打開cad數據集
                    pWorkspaceFactory = new CadWorkspaceFactoryClass();
                    pFeatureWorkspace = (IFeatureWorkspace)pWorkspaceFactory.OpenFromFile(filePath, 0);

                    //創建mdb(personal geodatabase)
                    pAccessWorkSpaceFactory = new AccessWorkspaceFactoryClass();
                    if (File.Exists(DataSaveFilePath +#p#分頁標題#e# @"\" + fileName + ".mdb"))
                    {
                        File.Delete(DataSaveFilePath + @"\" + fileName + ".mdb");
                    }

                    cadGISInfo.mdbfilepath = DataSaveFilePath + @"\" + fileName + ".mdb";
                    //ltMdbFilePath.Add(DataSaveFilePath + @"\" + fileName + ".mdb");

                    pAccessWorkSpaceFactory.Create(DataSaveFilePath, fileName + ".mdb", null, 0);
                    //打開一個要素集
                    pFeatureDataset = pFeatureWorkspace.OpenFeatureDataset(fileName);

                    IFeatureClassContainer pFeatureClassContainer = (IFeatureClassContainer)pFeatureDataset;
                    //對CAD文件中的要素進行遍歷處理
                    int count = pFeatureClassContainer.ClassCount;

                    for (#p#分頁標題#e#int j = 0; j < pFeatureClassContainer.ClassCount; j++)
                    {

                        IFeatureClass pFeatClass = pFeatureClassContainer.get_Class(j);
                        cadGISInfo.mdbFeaturesName.Add(pFeatClass.AliasName);
                        if (pFeatClass.FeatureType == esriFeatureType.esriFTCoverageAnnotation || pFeatClass.FeatureType == esriFeatureType.esriFTAnnotation)
                        {
                            pFeatureLayer = new CadAnnotationLayerClass();//注記圖層
                            importCADAnno.input_features = strFullPath + @"\" + pFeatClass.AliasName;
                            importCADAnno.output_featureclass = DataSaveFilePath + @"\" + fileName + ".mdb" + @"\" + pFeatClass.AliasName;
                            importCADAnno.reference_scale = 1000;
                            pGeoPro.Execute(importCADAnno, null);
                        }
                        #p#分頁標題#e#else
                        {
                            feaTofea.in_features = strFullPath + @"\" + pFeatClass.AliasName;
                            feaTofea.out_path = DataSaveFilePath + @"\" + fileName + ".mdb";

                            feaTofea.out_feature_class = pFeatClass.AliasName;
                            feaTofea.out_name = pFeatClass.AliasName;
                            pGeoPro.Execute(feaTofea, null);
                        }
                    }                 
                return true;
            }
            catch(Exception ex)
            {
                return false;
            }
            finally
            {                 
                GC.Collect();           
            }            
        }

從上面的代碼可以看出，實際C#調用了Geoprocessor 執行了ConversionTools.FeatureClass to FeatureClass工具，這是不是有點像用arctoolbox中的功能！這里就可以擴展用Geoprocessor 實現其他arctoolbox中能夠先實現的功能！#p#分頁標題#e#

這里也可以將上面的方法里的參數改為多個cad數據路徑,實現批量轉數據！