Item Template Not Using Data Context

Question

Here is code for WPF window (omitting irrelevant stuff):

XAML

<ListBox
	x:Name="lbxEvents">
	<ListBox.ItemTemplate>
		<DataTemplate>
			<TextBox
				BorderThickness="0"
				FontWeight="SemiBold"
				Padding="0,2,0,2"
				Text="{Binding Path=Title, Mode=OneWay}" />
		</DataTemplate>
	</ListBox.ItemTemplate>
</ListBox>

Code behind:

Public Sub New()
	InitializeComponent()
	DataContext = Me
End Sub

Public Structure evt
	Public Beginning As Date
	Public CategoryID As Integer
	Public Title As String
End Structure

Private Sub PopulateUpcomingEvents()
	Dim ev As evt
	Dim evts As New List(Of evt)
	<<Events are populated correctly>>
	lbxEvents.ItemsSource = evts
End Sub

Error message:

System.Windows.Data Error: 40 : BindingExpression path error: 'Title' property not found on 'object' ''evt' (HashCode=-13885767)'. BindingExpression:Path=Title; DataItem='evt' (HashCode=-13885767); target element is 'TextBox' (Name=''); target property is 'Text' (type 'String')

I cannot see why this error occurs.

Answer 1

Hi,@RogerSchlueter-7899. Welcome to Microsoft Q&A.

The problem may be due to ListBox item binding requiring the property of the bound object to be a public field or property. In your structure, evt uses public fields instead of properties, which is causing the binding to fail. To resolve this, you could convert the fields to properties.

	Public Class evt

		Public Property Beginning As Date

		Public Property CategoryID As Integer

		Public Property Title As String

	End Class

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Answer 2

Try a property: Public Property Title As String. Make sure that PopulateUpcomingEvents is executed.