CustomDataSetAdapter.OnQuery Method
Called to find all features that match the specified query parameters. This method must be implemented.
Thread safety: This property is not thread-safe.
OnQuery(Rectangle area, Query query, ViewInfo info)
Called to find all features that match the specified query parameters. This method must be implemented.Syntax
public virtual CustomDataSetResult OnQuery (
Rectangle area,
Query query,
ViewInfo info
)Parameters
area
Type: Rectangle
The area that specifies which features to return in the coordinate reference system of the custom dataset.
The area that specifies which features to return in the coordinate reference system of the custom dataset.
query
Type: Query
A query object that might limit which features should be returned.
A query object that might limit which features should be returned.
info
Type: ViewInfo
Provides information about the view and update operation.
Provides information about the view and update operation.
Return Value
Type: CustomDataSetResult
A result object that contains all features matching the query. Returning null is the same as returning an empty result.
A result object that contains all features matching the query. Returning null is the same as returning an empty result.
Remarks
This method is abstract and must be overridden and implemented. An implementation should find all features that overlap area and depending of if query has been specified return the ones for which Query.Match evaluates to True.
The return value should be an object implementing the IQueryResult interface. You can create your own custom class for this purpose, or use the built-in CustomDataSetResult class.
Note
The info parameter is often ignored but it can also be used to determine which features are returned. For example, if the custom dataset makes use of update attributes or works differently in a 3D view.
Platforms
Windows, Linux, Android