WPF drag item scroll bar self-scrolling (scroll bar can scroll up and down when dragging items to the height boundary)

Reference http://www.cnblogs.com/ListenFly/p/3281997.html

Point svpoint = e.getposition (SV);             )            {                sv. Scrolltoverticaloffset (5-5);}
Among them, SV is ScrollViewer, the main use is ScrollViewer Scrolltoverticaloffset method, dynamically modify the ScrollViewer scroll offset. In addition, if the value can be adjusted according to their own needs, and the second if the absolute value of processing is actually optional.

WPF drag item scroll bar self-scrolling (scroll bar can scroll up and down when dragging items to the height boundary)