Is there a way of checking SelectedIndex property in binding?

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I want the controls TextBox and PasswordBox to be disabled based on selection of Item in ComboBox.for that I thougt of using IsEnabled Property binding of TextBox and PasswordBox.so,how can I check the index in binding?Here's XAML code:

XML

<ComboBox Name="account_type"SelectionChanged="ComboBox_SelectionChanged">
    <ComboBoxItem IsSelected="True">Administrator</ComboBoxItem>
    <ComboBoxItem>Employee</ComboBoxItem>
</ComboBox
     ...
<TextBox Name="credentials" IsEnabled="{some binding}">
<PasswordBox Name="password" IsEnabled="{some binding}">

The two controls need to be disabled If selection is Admin.Also,there is no IsEnabled property for PasswordBox.

Posted 30-Oct-14 10:02am

Member 11098660

Updated 30-Oct-14 10:09am

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Richard Deeming 30-Oct-14 16:41pm

"Also,there is no IsEnabled property for PasswordBox."

Yes, there is: UIElement.IsEnabledProperty[^]

Since PasswordBox : Control : FrameworkElement : UIElement, any property defined on UIElement will be available on PasswordBox.

Member 11098660 31-Oct-14 2:27am

yes,you're right.thanks!

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Richard Deeming · Accepted Answer · 2014-10-30T10:51:00

Assuming that you want to disable the controls when the first item in the ComboBox is selected, then binding to SelectedIndex will work:

XML

<TextBox Name="credentials" IsEnabled="{Binding ElementName=account_type, Path=SelectedIndex}" />
<PasswordBox Name="password" IsEnabled="{Binding ElementName=account_type, Path=SelectedIndex}" />

This is because the binding will try to convert the value to a Boolean; 0 will be converted to false, and anything else will be converted to true.

For a more robust solution, you would need to bind to the SelectedItem, and provide a converter to turn the value of the item into a Boolean.

Alternatively, if you use MVVM, you could expose a CredentialEntryEnabled property with the relevant logic. When the account type property changed, you would raise the PropertyChanged event for the CredentialEntryEnabled property as well.