public override void DownloadTile(
TileId tileId,
TileEdgeFlags tileEdgeFlags,
object token,
RasterTileAvailableDelegate tileAvailableDelegate,
int priority)
{
var uri = tileUriDelegate(tileId);
if (uri is object)
{
if (tileRequests.TryGetValue(tileId, out var tileRequest1))
{
throw new InvalidOperationException("Multiple concurrent downloads of the same tile is not supported.");
}
TileRequest tileRequest2;
tileRequests[tileId] = tileRequest2 = new TileRequest()
{
TileId = tileId,
Token = token,
TileEdgeFlags = tileEdgeFlags,
TileAvailableDelegate = tileAvailableDelegate
};
tileRequest2.WebRequest = BitmapImageRequestQueue.Instance.CreateRequest(uri, (NetworkPriority)priority, tileRequest2, new BitmapImageRequestCompletedHandler(TileDownloadCompleted));
}
else if (tileSource.SuppliesImagesDirectly)
{
if (tileRequests.TryGetValue(tileId, out var tileRequest1))
{
throw new InvalidOperationException("Multiple concurrent downloads of the same tile is not supported.");
}
TileRequest tileRequest2;
tileRequests[tileId] = tileRequest2 = new TileRequest()
{
TileId = tileId,
Token = token,
TileEdgeFlags = tileEdgeFlags,
TileAvailableDelegate = tileAvailableDelegate
};
tileRequest2.WebRequest = BitmapImageRequestQueue.Instance.CreateRequest(tileImageDelegate, (NetworkPriority)priority, tileRequest2, new BitmapImageRequestCompletedHandler(TileDownloadCompleted));
}
else
{
tileAvailableDelegate(null, new Rect(), null, token);
}
}
public abstract void DownloadTile(
TileId tileId,
TileEdgeFlags tileEdgeFlags,
object token,
RasterTileAvailableDelegate tileAvailableDelegate,
int priority);