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    Wpf combobox not updating when source updates

    Default is, obviously, the default value of the Update Source Trigger.

    The other options are Property Changed, Lost Focus and Explicit.

    Instead, the source was updated only after focus was lost on the Text Box.

    This behavior is controlled by a property on the binding called Update Source Trigger.

    control, the underlying binding source is updated a soon as the control loses focus.

    This is something you might want to prevent sometimes – a common scenario is a model dialog that provides a Cancel button to abort changes.

    If you are using an item template to set content for each item, rather than Display Member Path, you can specify the property used when typing text by setting the Text Search. By default, the text that you enter will be matched against the property specified by the Display Member Path property, or by the value of the bound object’s To String method, if Display Member Path is not specified.

    In the example below, we don’t specify Display Member Path, but instead specify an Item Template.

    If the Display Member Path property is set, you can enter text that matches the property on the bound object specified by Display Member Path. Text Path to If a Combo Box has focus, you can just type some text in order to select an item.

    As an example: The snipped below commits all bound .

    In the previous article we saw how changes in a Text Box was not immediately sent back to the source.

    The first two has already been described, while the last one simply means that the update has to be pushed manually through to occur, using a call to Update Source on the Binding.

    To see how all of these options work, I have updated the example from the previous chapter to show you all of them: As you can see, each of the three textboxes now uses a different Update Source Trigger.

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