OgcWmsLayer.GetFeatureInfo Method
Sends a GetFeatureInfo request to the OGC WMS service and returns the result as a sequence of bytes.
GetFeatureInfo(View view, System.Int32 x, System.Int32 y, System.String format, System.Int32 featureCount)
Sends a GetFeatureInfo request to the OGC WMS service and returns the result as a sequence of bytes.Syntax
public System.IO.Stream GetFeatureInfo (
View view,
System.Int32 x,
System.Int32 y,
System.String format,
System.Int32 featureCount
)Parameters
A reference to the view to supply context such as view area, coordinate reference system etc.
The window X coordinate of the query point.
The window Y coordinate of the query point.
The format to return the response in.
The maximum number of features to get information about.
Return Value
The raw response data.
Remarks
This method performs a GetFeatureInfo request to the OGC WMS service and returns the result. This can be used to retrieve extra information about features in map images already downloaded from the service, perhaps when the user clicks the mouse somewhere on the map image.
To provide the same context (view area, coordinate reference system, window size etc.) in this request as when the map was first loaded, a reference to the view must be provided. It should not have been modified since the last time it was updated.
The format parameter specifies how the service should return the result. This must be one of the mime types returned by GetFeatureInfoFormats. Commonly supported formats are "text/plain" and "text/html", but some OGC WMS services may also encode the actual features as for instance GML. Because of the diversity of the different formats, this method makes no attempt to interpret the response, but returns it in its original form as a sequence of bytes. It is up the application to select a suitable format and decode the response accordingly.
Calls to this method ignore the ThrowExceptions property and will always throw exceptions if errors occur.
Platforms
Windows, Linux, Android