Thursday, July 11, 2013

wpf data binding - target Object holds the binding

One ticker (like the SPX last move direction -- up or down) can drive 22 visuals controls. Each visual control is a target objects
and can have only one driver. In this case, there would be 22 binding Objects for the 22 linkages.

The binding object is injected into the target object, not into the source object. The single source drives 22 targets, so it can't
accept and hold 22 binding objects.

Remember both source and target must be properties. Therefore, one source Property drives 22 target properties. 2 of the 22 target
properties might belong to the same visual control (since one visual can have many properties like font, background...), but it's
not likely. Usually, the 22 target properties belong to 22 visual controls.

Incidentally, the source may not be a visual and may not exist on xaml. It could be a plain old property of a plain old object, but
this object needs to be visible to xaml, so xaml can bind to it. Alternatively, it can be visible to the code behind, so we can set
the binding in code behind.

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