Binding Errors in a Simple Project

Question

I have carved out a simple project from a larger one to demonstrate the binding errors I am getting so the names I use might seem ... odd. The following is the ENTIRE project:

Window x:Class="MainWindow"
		xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
		xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
		xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
		xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
		mc:Ignorable="d"
		Title="MainWindow"
		Height="200"
		Width="100">
	<ListBox
		x:Name="lbxRoutes"
		DisplayMemberPath="Name"
		ItemsSource="{Binding Source=Routes}"
		Margin="10,13,10,0"
		SelectedValue="{Binding RouteID}"
		SelectedValuePath="ElementID"
		SelectionMode="Single">
	</ListBox>
</Window>

The code behind:

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

	Private Sub LoadMe(sender As Object, e As RoutedEventArgs) Handles Me.Loaded
		Routes = New List(Of GeoElement) From {
			New GeoElement With {.ElementID = 0, .Name = "abc"},
			New GeoElement With {.ElementID = 1, .Name = "def"},
			New GeoElement With {.ElementID = 2, .Name = "ghi"}
		}
	End Sub

	Private clsRoutes As List(Of GeoElement)
	Public Property Routes As List(Of GeoElement)
		Get
			Return clsRoutes
		End Get
		Set(value As List(Of GeoElement))
			clsRoutes = value
		End Set
	End Property

	Public Property ElementID As Integer
	Public Property RouteID As Integer
End Class

and finally the one class:

Public Class GeoElement
	Public Property ElementID As Integer
	Public Property Name As String
End Class

Here are the two errors I am getting:

System.Windows.Data Error: 40 : BindingExpression path error: 'ElementID' property not found on 'object' ''Char' (HashCode=7536755)'. BindingExpression:Path=ElementID; DataItem='Char' (HashCode=7536755); target element is 'ListBox' (Name='lbxRoutes'); target property is 'NoTarget' (type 'Object')

System.Windows.Data Error: 40 : BindingExpression path error: 'Name' property not found on 'object' ''Char' (HashCode=7536755)'. BindingExpression:Path=Name; DataItem='Char' (HashCode=7536755); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')

I cannot figure out why these errors are happening.

Answer 1

Hi,@RogerSchlueter-7899 . Welcome to Microsoft Q&A. You could update the code ItemsSource="{binding source=route}" to ItemsSource="{Bind Route}" and change the code-behind.

 <Grid>

    <ListBox

	x:Name="lbxRoutes"

	DisplayMemberPath="Name"

	ItemsSource="{Binding Routes}"

	Margin="10,13,10,0"

	SelectedValue="{Binding RouteID}"

	SelectedValuePath="ElementID"

	SelectionMode="Single">

    </ListBox>

</Grid>

Codebehind:

Class MainWindow
	Public Sub New()
		InitializeComponent()
		DataContext = Me
	End Sub
	Private clsRoutes As List(Of GeoElement) = New List(Of GeoElement) From {
			New GeoElement With {.ElementID = 0, .Name = "abc"},
			New GeoElement With {.ElementID = 1, .Name = "def"},
			New GeoElement With {.ElementID = 2, .Name = "ghi"}
		}
	Public Property Routes As List(Of GeoElement)
		Get
			Return clsRoutes
		End Get
		Set(value As List(Of GeoElement))
			clsRoutes = value
		End Set
	End Property

	Private _routeID As Integer
	Public Property RouteID As Integer
		Get
			Return _routeID
		End Get
		Set(ByVal value As Integer)

			If value <> _routeID Then
				_routeID = value
			End If
		End Set
	End Property
End Class

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