4. Explain one way, two way, one time and one way to source?

Explain one way, two way, one time and one way to source?

Answer

All the above 4 things define how data will flow between target and source objects when WPF binding is applied.

Two way: - Data can flow from both source to target and from target to source.

One way: - Data flows only from source to target.

One way to source: - Data flows only from target to source.

One time: - Data flows only for the first time from source to target and after that no communication happens.

Below is an easy tabular representation to memorize the same.

One way to source

 

Data flow
Bindings Target to Source Source target
Two way Yes Yes
One way to source Yes No
One way No Yes
One time No For first Yes

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