Engine中如何将sde中的要素类导出为shp？

        public void ConvertFeatureClassToShapefile()

        {

            //connect to sde

            IWorkspaceFactory sourceWorkspaceFactory = new SdeWorkspaceFactoryClass();

            IPropertySet connectionProps = new PropertySetClass();

            connectionProps.SetProperty(INSTANCE, sde:oracle11g:ORCL_131);

            connectionProps.SetProperty(user, sde);

            connectionProps.SetProperty(password, sde);

            connectionProps.SetProperty(VERSION, sde.DEFAULT);

            var sourceWorkspace = sourceWorkspaceFactory.Open(connectionProps, 0) as IWorkspace;

            IFeatureWorkspace feaws = sourceWorkspace as IFeatureWorkspace;

            var sourceFeatureClass = feaws.OpenFeatureClass(SDE.sdetoshp) as IFeatureClass;



            String targetWorkspacePath = @E:\\output;

          IWorkspaceFactory targetWorkspaceFactory = new ShapefileWorkspaceFactoryClass();

          IWorkspace targetWorkspace = targetWorkspaceFactory.OpenFromFile(targetWorkspacePath, 0);



          // Cast the workspaces to the IDataset interface and get name objects.

          IDataset sourceWorkspaceDataset = (IDataset)sourceWorkspace;

          IDataset targetWorkspaceDataset = (IDataset)targetWorkspace;

          IName sourceWorkspaceDatasetName = sourceWorkspaceDataset.FullName;

          IName targetWorkspaceDatasetName = targetWorkspaceDataset.FullName;

          IWorkspaceName sourceWorkspaceName = (IWorkspaceName)sourceWorkspaceDatasetName;

          IWorkspaceName targetWorkspaceName = (IWorkspaceName)targetWorkspaceDatasetName;



          IFeatureClassName sourceFeatureClassName = new FeatureClassNameClass();

          IDatasetName sourceDatasetName = (IDatasetName)sourceFeatureClassName;

          sourceDatasetName.Name = sdetoshp;

          sourceDatasetName.WorkspaceName = sourceWorkspaceName;



          // Create a name object for the FGDB feature class and cast it to the IDatasetName interface.

          IFeatureClassName targetFeatureClassName = new FeatureClassNameClass();

          IDatasetName targetDatasetName = (IDatasetName)targetFeatureClassName;

          targetDatasetName.Name = test6;

          targetDatasetName.WorkspaceName = targetWorkspaceName;



          // Create the objects and references necessary for field validation.

          IFieldChecker fieldChecker = new FieldCheckerClass();

          IFields sourceFields = sourceFeatureClass.Fields;

          IFields targetFields = null;

          IEnumFieldError enumFieldError = null;



          // Set the required properties for the IFieldChecker interface.

          fieldChecker.InputWorkspace = sourceWorkspace;

          fieldChecker.ValidateWorkspace = targetWorkspace;



          // Validate the fields and check for errors.

          fieldChecker.Validate(sourceFields, out enumFieldError, out targetFields);

          if (enumFieldError != null)

          {

            // Handle the errors in a way appropriate to your application.

            Console.WriteLine(Errors were encountered during field validation.);

          }



          // Find the shape field.

          String shapeFieldName = sourceFeatureClass.ShapeFieldName;

          int shapeFieldIndex = sourceFeatureClass.FindField(shapeFieldName);

          IField shapeField = sourceFields.get_Field(shapeFieldIndex);



          // Get the geometry definition from the shape field and clone it.

          IGeometryDef geometryDef = shapeField.GeometryDef;

          IClone geometryDefClone = (IClone)geometryDef;

          IClone targetGeometryDefClone = geometryDefClone.Clone();

          IGeometryDef targetGeometryDef = (IGeometryDef)targetGeometryDefClone;



          // Create a query filter to remove ramps, interstates and highways.

          IQueryFilter queryFilter = new QueryFilterClass();

          string whcl = SQBH=''2012滨海地条申字0001'';

          queryFilter.WhereClause = whcl;



          // Create the converter and run the conversion.

          IFeatureDataConverter featureDataConverter = new FeatureDataConverterClass();

          IEnumInvalidObject enumInvalidObject =

            featureDataConverter.ConvertFeatureClass(sourceFeatureClassName,

            queryFilter, null, targetFeatureClassName, targetGeometryDef, targetFields, , 1000, 0);



          // Check for errors.

          IInvalidObjectInfo invalidObjectInfo = null;

          enumInvalidObject.Reset();

          while ((invalidObjectInfo = enumInvalidObject.Next()) != null)

          {

            // Handle the errors in a way appropriate to the application.

            Console.WriteLine(Errors occurred for the following feature: {0},

              invalidObjectInfo.InvalidObjectID);

          }

        }