Null Pointer Exception - Events and Listeners


This question already has an answer here:


You forgot to initialize the itemPanel before setting the listener on it:

itemPanel = new ItemPanel(....);
itemPanel.setItemPanelLogListener(new ItemPanelLogListener() {

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Convert Viewport point to container reference point in WPF

wpf viewport point mouse-coordinates

I have plotted controls on ViewPort at specified locations. And the ViewPort is placed on Canvas.

How to avoid code duplication for one-off methods with a slightly different signature


I am wrapping a number of functions from a vender API in C#. Each of the wrapping functions will fit the pattern: