MultiScaleTileSource.InvalidateTileLayer Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Invalidates specified tile layers.
Assembly: System.Windows (in System.Windows.dll)
'Declaration Protected Sub InvalidateTileLayer ( _ level As Integer, _ tilePositionX As Integer, _ tilePositionY As Integer, _ tileLayer As Integer _ )
Parameters
- level
- Type: System.Int32
Tile level.
- tilePositionX
- Type: System.Int32
X position of the tile.
- tilePositionY
- Type: System.Int32
Y position of the tile.
- tileLayer
- Type: System.Int32
Layer of the tile.
The InvalidateTileLayer method can be used to change the URIs returned for a tile layer. For example, if you have an implementation of a map and you want to zoom straight to street level, normally Deep Zoom would blend all the levels from 0 to 19. Instead, you can implement a MultiScaleTileSource class that returns null for all layers 18 and below. When a user starts to zoom out, you invalidate all the layers through 18, and return the proper URLs for the tiles instead.