S57DataSet.FeatureIndexPath Property
Gets or sets the directory where the feature index files will be saved.
Syntax
public System.String FeatureIndexPath { get; set; }Property Value
Default: ""
The directory where the feature index files will be saved.
This property can only be modified before the dataset has been initialized. Attempting to modify it after initialization will cause an exception to be thrown.
Remarks
For performance reasons the S57DataSet scans every data file the first time it is loaded, and for each data file it builds an efficient spatial index of all the features in the file. The index is then saved to a file in the directory specified by this property. This process can take several seconds for each file. The next time the dataset needs to open a file however, the index can be loaded from the saved index file, which is much faster.
If reading from an S-63 database (that is, if S63DatabasePath is specified), and this property is set to an empty string, the feature index files will saved in the S-63 database directory. If both properties are empty, the feature indexes will still be created and held in memory, but not saved to disk.
In the S-63 case, you should normally leave this property empty. In almost all other cases you should set both this and the IndexPath properties to valid directories, to reduce dataset loading times as much as possible.
Platforms
Windows, Linux, Android