WPF RadGridView Q3 2011 and DynamicObject.TrySetMember to MVVM Inherits class

[JORGE]

Hello,

I’m running into a problem with WPF telerik:RadGridView Q3 2011 and DynamicObject

1) I use DynamicObject and pattern MVVM and After edit data in grid, the “DynamicObject.TrySetMember(...)” is never called by telerik:RadGridView.
Note, with Telerik WPF Q1 2011 it work fine!

2) If use “Inherits” class, the telerik:RadGridView see and use only the properties of base class
for example I have one property named “UpperName” inside one class Inherited from another class and “UpperName” is never displayed by telerik:RadGridView

Thanks for any help!

Ps: I use Telerik WPF 2011.3.1316.40 for .NET 4 , Visual Studio 2010 (x86) , Windows 7 (x64)

File : MainWindow.xaml :

<Window x:Class="MainWindow"

        xmlns:system="clr-namespace:System;assembly=mscorlib"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"

        Title="MainWindow" Height="412" Width="629" xmlns:my="clr-namespace:System;assembly=mscorlib">

        <Grid>

        <telerik:RadGridView  AutoGenerateColumns="False" ItemsSource="{Binding}" Name="DataGridList" Margin="0,0,0,49">     

             

           <telerik:RadGridView.Columns>

                <telerik:GridViewDataColumn Width="*" Header="Upper Name"  DataMemberBinding="{Binding Path=UpperName}"   />

                <telerik:GridViewDataColumn Width="*" Header="Product Name"  DataMemberBinding="{Binding Path=Name,Mode=TwoWay}"   />

                <telerik:GridViewDataColumn Width="*" Header="Product ID"     DataMemberBinding="{Binding Path=ID,Mode=TwoWay}"   />               

            </telerik:RadGridView.Columns>

        </telerik:RadGridView>

 

        <Button Content="Here TrySetMember is OK" Height="43" HorizontalAlignment="Left" Margin="12,0,0,0" Name="Button1" VerticalAlignment="Bottom" Width="267" />

         

    </Grid>

</Window>


File : MainWindow.xaml.vb :

Imports System.Collections.ObjectModel

Class MainWindow

    Private _ViewProducts As New ObservableCollection(Of VM_Product)

    Public Sub New()

        ' This call is required by the designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.
        Dim i As Integer
        Dim p As VM_Product
        Dim MyObject As Object
        For i = 0 To 10
            p = New VM_Product

            _ViewProducts.Add(p)

            'Here TrySetMember is OK !
            MyObject = _ViewProducts.Item(i)
            MyObject.ID = i
            MyObject.Name = "Name " & i
        Next

        'But : With telerik:RadGridView TrySetMember is never called after input data from telerik:RadGridView
        Me.DataGridList.BeginInit()
        Me.DataGridList.DataContext = _ViewProducts
        Me.DataGridList.EndInit()
    End Sub

    Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click
        'Here TrySetMember is OK !
        Dim MyObject As Object = _ViewProducts.Item(0)
        MyObject.Name = TimeOfDay & " Changed by System.Dynamic TrySetMember "
    End Sub
End Class

Very simple Dynamic ViewModel inherits from System DynamicObject
File : VM_Dynamic.vb

Imports System.Dynamic
Imports System.ComponentModel
Imports System.Reflection

Public MustInherit Class VM_Dynamic
    Inherits DynamicObject
    Implements INotifyPropertyChanged

    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
    Private _Entity As Object

    Public Property Entity() As Object
        Get
            Entity = _Entity
        End Get
        Set(value As Object)
            _Entity = value
        End Set
    End Property

    Public Overrides Function TryGetMember(ByVal binder As System.Dynamic.GetMemberBinder, ByRef result As Object) As Boolean
        Dim nProperty As PropertyInfo = _Entity.GetType().GetProperty(binder.Name)

        If nProperty Is Nothing OrElse nProperty.CanRead = False Then
            result = Nothing
            Return False
        End If

        result = nProperty.GetValue(_Entity, Nothing)
        Return True
    End Function

    Public Overrides Function TrySetMember(ByVal binder As System.Dynamic.SetMemberBinder, ByVal value As Object) As Boolean
        Dim nProperty As PropertyInfo = _Entity.GetType().GetProperty(binder.Name)
        If nProperty Is Nothing Or nProperty.CanRead = False Then Return False

        If nProperty.GetValue(Entity, Nothing) <> value AndAlso nProperty.CanWrite = True Then
            nProperty.SetValue(Entity, value, Nothing)
            RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(binder.Name))
        End If

        Return True
    End Function

    Protected Overridable Sub OnPropertyChanged(ByRef propertyName As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
    End Sub

End Class

Model "Product"
File : Product.vb

Public Class Product
    Private _ID As Integer
    Private _Name As String

    Public Property ID() As Integer
        Get
            ID = _ID
        End Get
        Set(value As Integer)
            _ID = value
        End Set
    End Property

    Public Property Name() As String
        Get
            Name = _Name
        End Get
        Set(value As String)
            _Name = value
        End Set
    End Property

End Class

"Product" View Model , inherits class "VM_Dynamic"
File : VM_Product.vb

Imports System.ComponentModel

Public Class VM_Product
    Inherits VM_Dynamic

    'This property is never called by telerik:RadGridView from XAML !!!
    Public ReadOnly Property UpperName() As String
        Get
            UpperName = StrConv(Me.Entity.Name, VbStrConv.Uppercase)
        End Get
    End Property

    Public Sub New()
        Me.Entity = New Product
    End Sub
End Class

[Franck]

Hello, I have the same issue.

When a cell is modified, the getter is called and the old value replaces the new one.

Any idea of what happens ?

Best regards,

Franck

[Vlad]

Hi,

 Please open support ticket and send us small example project demonstrating your scenario and the problem. 

All the best,
Vlad
the Telerik team

[Combinations]

Vlad:
I've got the same problem as Franck (not being able to use DynamicObject bound in a GridViewDataColumn). Did you solve the problem? Otherwise I can send a example project.

I'm using 2013Q1 components.

[Combinations]

I found out why it didn't work for me:
I hadn't implemented the method GetDynamicMemberNames() in my DynamicObject class. It seems as if that is required.

[Dimitrina]

Hello,

Thank you for sharing the solution with the community. I will also check the sample you sent in your another ticket.

Greetings,
Didie
the Telerik team