AE 删除空间索引及重建空间索引

/// <summary>
/// 重建空间索引
/// </summary>
/// <param name="feaCls">要素类</param>
/// <param name="gridOneSize">gridOneSize</param>
/// <param name="gridTwoSize">gridTwoSize</param>
/// <param name="gridThreeSize">gridThreeSize</param>
private void RebuildSpatialIndex(IFeatureClass feaCls, Double gridOneSize, Double gridTwoSize, Double gridThreeSize)
{
try
{
DeleteSpatialIndex(feaCls);
String shapeFieldName = feaCls.ShapeFieldName;

// Clone the shape field from the feature class.
int shapeFieldIndex = feaCls.FindField(shapeFieldName);
IFields fields = feaCls.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 IndexClass();
IIndexEdit newIndexEdit = (IIndexEdit)newIndex;
_2 = shapeFieldName + "_Index";
newIndexEdit.IsAscending_2 = true;
newIndexEdit.IsUnique_2 = false;

// Create a fields collection and assign it to the new index.
IFields newIndexFields = new FieldsClass();
IFieldsEdit newIndexFieldsEdit = (IFieldsEdit)newIndexFields;
newIndexFieldsEdit.AddField(targetField);
newIndexEdit.Fields_2 = newIndexFields;

// Add the spatial index back into the feature class.
feaCls.AddIndex(newIndex);
}
catch
{

}
}

/// <summary>
/// 删除原有索引
/// </summary>
/// <param name="feaCls">要素类</param>
private void DeleteSpatialIndex(IFeatureClass feaCls)
{
try
{
IIndexes indexes = feaCls.Indexes;
String shapeFieldName = feaCls.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)
{
feaCls.DeleteIndex(index);
}
}
catch
{
}
}