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）

　　下面的方法實現了點線面圖層轉成Shape文件

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 = 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();
}

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)
{

}
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();
}

}

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

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&nbsp;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
{                
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 + @"\\" + 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 (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);
}
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！

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！