ArcGIS Runtime for .NET10.2.5的pinch事件无效

【解决办法】：
通过与美国方面交流，该事件没有实现。 参考如下：


 I have tested your application and the tile package using ArcGIS Runtime SDK 10.2.5 on Surface Pro 2, and am able to reproduce the same behavior as in the video you provided. We also had a talk with dev regarding this. This is what we feel:
This is how its supposed to work. SnapToLevels settings is most likely for tap and scroll events. Pinch is a different event from mouse scroll/double click/tap. Pinch is supposed to be smooth. Respecting the SnapToLevels property would make it counter intuitive.

Testing the tile package in ArcMap on Surface Pro 2: Pinch does not snap to level of details, which again points that pinch is not supposed to work similar to mouse scroll/double click/tap
(ArcMap has opposite ZoomIn and ZoomOut pinch events. There is a setting with which it can be changed if desired).

I will be writing up an equivalent ArcGIS Runtime for .NET application to test the behavior too. I will update you as soon I am able to make some progress. In the meantime, please feel to share your comments or questions.