public bool DeleteSpatialIndex(IFeatureClass featureClass)
{
bool result = true;
ISchemaLock pSchemaLock = featureClass as ISchemaLock;
try
{
pSchemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);
IIndexes indexes = featureClass.Indexes;
String shapeFieldName = featureClass.ShapeFieldName;
IEnumIndex enumIndex = indexes.FindIndexesByFieldName(shapeFieldName);
enumIndex.Reset();
IIndex index = enumIndex.Next();
if (index != null)
{
featureClass.DeleteIndex(index);
}
}
catch (Exception ex)
{
ErrorMessage = ex.ToString();
result = false;
}
finally
{
pSchemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
}
return(result);
}
public static void dropSpatialIndex(IFeatureClass fc)
{
//Delete the spatial index
IIndexes indexes = fc.Indexes;
String shapeFieldName = fc.ShapeFieldName;
IEnumIndex enumIndex = indexes.FindIndexesByFieldName(shapeFieldName);
enumIndex.Reset();
// Get the index based on the shape field (should only be one) and delete it.
IIndex index = enumIndex.Next();
if (index != null)
{
fc.DeleteIndex(index);
}
}
/// <summary>
/// 重建要素类空间索引
/// </summary>
/// <param name="pFeatureClass"></param>
/// <param name="gridOneSize"></param>
/// <param name="gridTwoSize"></param>
/// <param name="gridThreeSize"></param>
/// <returns></returns>
public bool RebuildSpatialIndex(IFeatureClass pFeatureClass, Double gridOneSize = 0, Double gridTwoSize = 0, Double gridThreeSize = 0)
{
ISchemaLock pSchemaLock = pFeatureClass as ISchemaLock;
try
{
pSchemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);
// Get an enumerator for indexes based on the shape field.
IIndexes indexes = pFeatureClass.Indexes;
String shapeFieldName = pFeatureClass.ShapeFieldName;
IEnumIndex enumIndex = indexes.FindIndexesByFieldName(shapeFieldName);
enumIndex.Reset();
// Get the index based on the shape field (should only be one) and delete it.
IIndex index = enumIndex.Next();
if (index != null)
{
pFeatureClass.DeleteIndex(index);
}
// Clone the shape field from the feature class.
int shapeFieldIndex = pFeatureClass.FindField(shapeFieldName);
IFields fields = pFeatureClass.Fields;
IField sourceField = fields.get_Field(shapeFieldIndex);
IClone sourceFieldClone = (IClone)sourceField;
IClone targetFieldClone = sourceFieldClone.Clone();
IField targetField = (IField)targetFieldClone;
// Open the geometry definition from the cloned field and modify it.
IGeometryDef geometryDef = targetField.GeometryDef;
IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;
geometryDefEdit.GridCount_2 = 3;
geometryDefEdit.set_GridSize(0, gridOneSize);
geometryDefEdit.set_GridSize(1, gridTwoSize);
geometryDefEdit.set_GridSize(2, gridThreeSize);
// Create a spatial index and set the required attributes.
IIndex newIndex = new Index();
IIndexEdit newIndexEdit = (IIndexEdit)newIndex;
newIndexEdit.Name_2 = String.Concat(shapeFieldName, "_Index");
newIndexEdit.IsAscending_2 = true;
newIndexEdit.IsUnique_2 = false;
// Create a fields collection and assign it to the new index.
IFields newIndexFields = new Fields();
IFieldsEdit newIndexFieldsEdit = (IFieldsEdit)newIndexFields;
newIndexFieldsEdit.AddField(targetField);
newIndexEdit.Fields_2 = newIndexFields;
// Add the spatial index back into the feature class.
pFeatureClass.AddIndex(newIndex);
return(true);
}
catch
{
return(false);
}
finally
{
pSchemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
}
}
