数据的转换(shp sde mdb 之间的转换)

数据的转换(shp sde mdb 之间的转换)

调用用下面的方法可以将要素类从sde导出到shp或者mdb 或者从三个中的任意一个导出到另外一个。方法是：

 /// <summary>
        /// 将一个要素类从一个工作空间转移到另外一个工作空间
        ///
注意目标工作空间不能有改要素类，必须先清除 
        /// </summary>
        /// <param
name=”sourceWorkspace”>源工作空间</param>
        /// <param
name=”targetWorkspace”>目标工作空间</param>
        /// <param
name=”nameOfSourceFeatureClass”>源要素类名</param>
        /// <param
name=”nameOfTargetFeatureClass”>目标要素类名</param>
        public void
IFeatureDataConverter_ConvertFeatureClass(IWorkspace sourceWorkspace, IWorkspace
targetWorkspace, string nameOfSourceFeatureClass, string
nameOfTargetFeatureClass)
        {           
            //create
source workspace name  
            IDataset sourceWorkspaceDataset =
(IDataset)sourceWorkspace;
            IWorkspaceName sourceWorkspaceName =
(IWorkspaceName)sourceWorkspaceDataset.FullName;
            //create source
dataset name  
            IFeatureClassName sourceFeatureClassName = new
FeatureClassNameClass();
            IDatasetName sourceDatasetName =
(IDatasetName)sourceFeatureClassName;
           
sourceDatasetName.WorkspaceName = sourceWorkspaceName;
           
sourceDatasetName.Name = nameOfSourceFeatureClass;
            //create
target workspace name  
            IDataset targetWorkspaceDataset =
(IDataset)targetWorkspace;
            IWorkspaceName targetWorkspaceName =
(IWorkspaceName)targetWorkspaceDataset.FullName;
            //create target
dataset name  
            IFeatureClassName targetFeatureClassName = new
FeatureClassNameClass();
            IDatasetName targetDatasetName =
(IDatasetName)targetFeatureClassName;
           
targetDatasetName.WorkspaceName = targetWorkspaceName;
           
targetDatasetName.Name = nameOfTargetFeatureClass;
            //Open input
Featureclass to get field definitions.  
           
ESRI.ArcGIS.esriSystem.IName sourceName =
(ESRI.ArcGIS.esriSystem.IName)sourceFeatureClassName;
           
IFeatureClass sourceFeatureClass = (IFeatureClass)sourceName.Open();

            //Validate the field names because you are converting between
different workspace types.  
            IFieldChecker fieldChecker = new
FieldCheckerClass();
            IFields
targetFeatureClassFields;
            IFields sourceFeatureClassFields =
sourceFeatureClass.Fields;
            IEnumFieldError
enumFieldError;
            // Most importantly set the input and validate
workspaces!    
            fieldChecker.InputWorkspace =
sourceWorkspace;
            fieldChecker.ValidateWorkspace =
targetWorkspace;
            fieldChecker.Validate(sourceFeatureClassFields,
out enumFieldError, out targetFeatureClassFields);
            // Loop
through the output fields to find the geomerty field  
            IField
geometryField;
            for (int i = 0; i <
targetFeatureClassFields.FieldCount; i++)
            {
                if
(targetFeatureClassFields.get_Field(i).Type ==
esriFieldType.esriFieldTypeGeometry)
                {
                   
geometryField = targetFeatureClassFields.get_Field(i);
                    //
Get the geometry field’s geometry defenition           
                   
IGeometryDef geometryDef = geometryField.GeometryDef;
                   
//Give the geometry definition a spatial index grid count and grid size       

                    IGeometryDefEdit targetFCGeoDefEdit =
(IGeometryDefEdit)geometryDef;
                   
targetFCGeoDefEdit.GridCount_2 = 1;
                   
targetFCGeoDefEdit.set_GridSize(0, 0);
                    //Allow ArcGIS to
determine a valid grid size for the data loaded     
                   
targetFCGeoDefEdit.SpatialReference_2 =
geometryField.GeometryDef.SpatialReference;
                    // we want to
convert all of the features  
                    IQueryFilter queryFilter =
new QueryFilterClass();
                    queryFilter.WhereClause =
“”;
                    // Load the feature class    
                   
IFeatureDataConverter fctofc = new
FeatureDataConverterClass();
                    IEnumInvalidObject
enumErrors = fctofc.ConvertFeatureClass(sourceFeatureClassName, queryFilter,
null, targetFeatureClassName, geometryDef, targetFeatureClassFields, “”, 1000,
0);
                    break;
                }
            }

        }

只要设定了工作空间，不管工作空间是文件的 数据库的 还是什么的，可以自由转换。

比如我要将sde的要素类导出成shp文件，如下：

public void Export_Shp(IFeatureClass pFeatClass, string path)
       
{
            IDataset pDataSet = pFeatClass as IDataset;
           
IWorkspace pWorkspace = pDataSet.Workspace;

            string strShapeFolder = path;
            string fileName =
pFeatClass.AliasName;          

            string fullFileName = path + “//” + fileName +
“.shp”;
            fullFileName = fullFileName.Replace(@”//”,
@”/”);
            if (File.Exists(fullFileName))
            {
//如果已经存在就先删除
                DirectoryInfo di = new
DirectoryInfo(path);
                FileInfo[] fis = di.GetFiles(fileName +
“*”);
                foreach (FileInfo fi in fis)
               
{
                    fi.Delete();
                }
            }

            IWorkspaceFactory pWSF = new
ShapefileWorkspaceFactoryClass();
            IFeatureWorkspace pWS =
(IFeatureWorkspace)pWSF.OpenFromFile(strShapeFolder, 0);

            this.IFeatureDataConverter_ConvertFeatureClass(pWorkspace,
(IWorkspace)pWS, pFeatClass.AliasName, fileName);

        }