MultiScaleTileSource.InvalidateTileLayer Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Invalidates specified tile layers.
Namespace: System.Windows.Media
Assembly: System.Windows (in System.Windows.dll)
Syntax
'Declaration
Protected Sub InvalidateTileLayer ( _
level As Integer, _
tilePositionX As Integer, _
tilePositionY As Integer, _
tileLayer As Integer _
)
protected void InvalidateTileLayer(
int level,
int tilePositionX,
int tilePositionY,
int tileLayer
)
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.
Remarks
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.
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.