c# - WPF Binding TwoWay not working, OneWayToSource working. WHY? -

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i have control dependencyproperty of type timespan. when try bind property, value not being updated.

usage of control:

<controls:timecontrol time={binding sometimespanproperty} />

when change value of time in control, change not updated in sometimespanproperty. however, if change {binding sometimespanproperty} {binding sometimespanproperty,mode=onewaytosource}, updated.

i found solution. if reading in future wants know it:

i had explicitly set mode of binding twoway, because default binding mode timespan type property oneway.

from this:

<controls:timecontrol time={binding sometimespanproperty} />

to this:

<controls:timecontrol time={binding sometimespanproperty,mode=twoway} />

and works!


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