C# ESRI.DeleteIndex方法代码示例

        public System.Boolean BuildShapefileSpatialIndex(ESRI.ArcGIS.Geodatabase.IFeatureClass ShapefileFeatureClass)
        {
            ESRI.ArcGIS.Geodatabase.IFields     indexShapefileFields      = null;
              ESRI.ArcGIS.Geodatabase.IFieldsEdit indexShapefileFieldsEdit  = null;
              ESRI.ArcGIS.Geodatabase.IField      shapefileGeometryField    = null;
              ESRI.ArcGIS.Geodatabase.IIndex      shapefileSpatialIndex     = null;
              ESRI.ArcGIS.Geodatabase.IIndexEdit  shapefileSpatialIndexEdit = null;
              ESRI.ArcGIS.Geodatabase.IEnumIndex  shapefileExistingIndices  = null;
              ESRI.ArcGIS.Geodatabase.IIndex      shapefileDeleteIndex      = null;

              try
              {
            //  Make sure the Feature Class Object is not a NULL Pointer before moving on.
            if (ShapefileFeatureClass == null)
            {
              //  Let the User know that a valid Shapefile Name MUST be passed before the index can
              //  be created.
              if (ErrorMessage != null)
              {
            ErrorMessage("A Valid Shapefile Object must be passed to this method! The MaintTools.FeatureClassUtilities.BuildShapefileSpatialIndex() Method failed!");
              }

              //  Return FALSE to the calling method to indicate that this method failed.
              return false;

            }

            //  If the Process Message Event has been instantiated, let the user know what is happening.
            if (ProcessMessage != null)
            {
              ProcessMessage("      -  Opening the Shapefile Geometry Field and preparing it to be indexed...");
            }

            //  Create a Fields Object and open an Editing Object on it so that new fields can be added.
            indexShapefileFields = new ESRI.ArcGIS.Geodatabase.FieldsClass();
            indexShapefileFieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)indexShapefileFields;

            //  Find the Geometry Field in the Field in the Shapefile Fields Object and add it to the
            //  Fields Collection.
            indexShapefileFieldsEdit.FieldCount_2 = 1;
            int l = ShapefileFeatureClass.FindField(ShapefileFeatureClass.ShapeFieldName);
            if (l < 0)
            {
              //  Let the user know that the Geometry Field of the Shapefile Feature Class could not
              //  be found.
              if (ErrorMessage != null)
              {
            ErrorMessage("The Shapefile Geometry Field could not be found! The MaintTools.FeatureClassUtilities.BuildShapefileSpatialIndex() Method failed!");
              }

              //  Return FALSE to the calling method to indicate that this process failed.
              return false;

            }
            shapefileGeometryField = ShapefileFeatureClass.Fields.get_Field(l);
            indexShapefileFieldsEdit.set_Field(0, shapefileGeometryField);

            //  If the Process Message Event has been instantiated, let the user know what is happening.
            if (ProcessMessage != null)
            {
              ProcessMessage("      -  Creating the Index and applying it to the Shapefile Feature Class Geometry Field...");
            }

            //  Create a new index and prepare it to be added to the table.
            shapefileSpatialIndex = new ESRI.ArcGIS.Geodatabase.IndexClass();
            shapefileSpatialIndexEdit = (ESRI.ArcGIS.Geodatabase.IIndexEdit)shapefileSpatialIndex;
            shapefileSpatialIndexEdit.Fields_2 = indexShapefileFields;
            shapefileSpatialIndexEdit.Name_2 = "Idx_1";

            //  Remove all Indices from the table.
            shapefileExistingIndices = ShapefileFeatureClass.Indexes.FindIndexesByFieldName(ShapefileFeatureClass.ShapeFieldName);

            shapefileDeleteIndex = shapefileExistingIndices.Next();
            while (shapefileDeleteIndex != null)
            {
              ShapefileFeatureClass.DeleteIndex(shapefileDeleteIndex);
              shapefileDeleteIndex = shapefileExistingIndices.Next();
            }

            //  Add the index to the Shapefile.
            ShapefileFeatureClass.AddIndex(shapefileSpatialIndex);

            //  If the process made it to here it was successful so return TRUE to the calling method.
            return true;

              }
              catch (System.Exception caught)
              {
            //  Determine the Line Number from which the exception was thrown.
            System.Diagnostics.StackTrace stackTrace = new System.Diagnostics.StackTrace(caught, true);
            System.Diagnostics.StackFrame stackFrame = stackTrace.GetFrame(stackTrace.FrameCount - 1);
            int lineNumber = stackFrame.GetFileLineNumber();

            //  Let the user know that this method failed.
            if (ErrorMessage != null)
            {
              ErrorMessage("The MaintTools.FeatureClassUtilities.BuildShapefileSpatialIndex() Method failed with error message - " + caught.Message + " (Line:  " + lineNumber.ToString() + ")!");

            }

//.........这里部分代码省略.........