As there is not variable or method is available with ArcGISMapImageLayer for setting Definition Expression.So how to we set definition Expression for ArcGISMapImageLayer
Since the map image layer is comprised of one or more sublayers, you can loop through the sublayers and set it on the definitionExpression property there.
Update: 'definitionExpression' is currently not available but will be available on AGSArcGISMapImageSublayer class in the upcoming v100.1 release.
Thanks for your reply,
Sublayer of map image layer is still a type of mapImageSublayer which has no property or instance method for setting definition expression.So I am not able to set it.
The property is currently not available, but will be very shortly in the upcoming V100.1 release. I've corrected my original comment.