[Solved] I am trying to simply bind to a class in the codebehind and am getting a BindingExpression Error

[Ed]

I am trying to simply bind to a class in the codebehind and am getting a BindingExpression Error

It works fine if I try add the itemsource from code behind as so

            ReportGrid.ItemsSource = SampleDataPeople;

But when I add via Binding I get this and no

Error: BindingExpression path error: 'SampleDataPeople' property not found on
'GridApp.Data.SampleDataItem, GridApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
BindingExpression: Path='SampleDataPeople' DataItem='GridApp.Data.SampleDataItem, GridApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; target element is 'Telerik.UI.Xaml.Controls.Grid.RadDataGrid' (Name='ReportGrid'); target property is 'ItemsSource' (type 'Object')
'GridApp.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\system32\WinMetadata\Windows.Devices.winmd'

<telerikGrid:RadDataGrid x:Name="ReportGrid"
           ItemsSource="{Binding SampleDataPeople }"
           AutoGenerateColumns="False" >

           <telerikGrid:RadDataGrid.Columns >
           <telerikGrid:DataGridTextColumn PropertyName="FirstName" Header="FirstName"/>
           <telerikGrid:DataGridTextColumn PropertyName="LastName" Header="LastName"/>
       </telerikGrid:RadDataGrid.Columns>

   </telerikGrid:RadDataGrid>

 

public ObservableCollection<SampleDataPerson> sampleDataPeople;
      public ObservableCollection<SampleDataPerson> SampleDataPeople
      {
          get { return sampleDataPeople; }
          set
          {
              sampleDataPeople = value;
              RaisePropertyChanged("SampleDataPeople");
          }
      }

 

 

 

[Ivaylo Gergov]

Hi Ed,

Thank you for contacting us.

I have prepared a working project using the given code snippets. Please, find the attached file.
Can you please clarify if this is working on your side too and if yes - can you modify it in order to reproduce the described issue?

I am looking forward to your reply.

 

Kind regards,
Ivaylo Gergov
the Telerik team

[Ed]

Thanks, based on that I think I see the issue, I assumed that I did not need a separate class as the viewmodel and the binding would find the People class in the code behind.  Ill make a separate VM like you did and it will probably be fine.

Ed,

[Ed]

Ivaylo, first thanks for helping.
I want to say that once I put my code all back in it once again stoped working.

it looks like I am using an await method so wondering if that is the reason?

namespace GridApp.Controls
{
    public partial class CtlReport : UserControl
    {
        CtrlReportViewModel vm;

        public  CtlReport()
        {
            this.InitializeComponent();

            vm = new CtrlReportViewModel();
            this.ReportGrid.DataContext = vm;

// this loads grid
            vm.LoadDataNoAsync();
// this does not
//            vm.LoadData();
        }
    }
}

using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.ComponentModel;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

 

namespace GridApp.Controls

{

    class CtrlReportViewModel : INotifyPropertyChanged

    {

        public void LoadDataNoAsync()

        {

            ServiceReference.RemoteHostServiceClient client = new ServiceReference.RemoteHostServiceClient();

            var favorites = client.UserFavoriteGetAsync(Globals.Id, "widget");

            ReportData = new ObservableCollection<ReportsDataItem>();

            foreach (var f in favorites.Result)

            {

                var userWidget = client.UserWidgetByIdGetAsync(f.ObjectID);

                ReportData.Add(new ReportsDataItem()

                {

                    Description = userWidget.Result.Description,

                    Id = userWidget.Result.Id,

                });

                RaisePropertyChanged("ReportData");

 

                System.Diagnostics.Debug.WriteLine("Owner {0}, Description {1}", userWidget.Result.Id, userWidget.Result.Description);

            }

        }

 

 

        public async void LoadData()

        {

            ServiceReference.RemoteHostServiceClient client = new ServiceReference.RemoteHostServiceClient();

            var favorites = (await client.UserFavoriteGetAsync(Globals.Id, "widget")).ToList();

            ReportData = new ObservableCollection<ReportsDataItem>();

            foreach (var f in favorites)

            {

                var userWidget = (await client.UserWidgetByIdGetAsync(f.ObjectID));

                ReportData.Add(new ReportsDataItem()

                {

                    Description = userWidget.Description,

                    Id = userWidget.Id,

                });

                RaisePropertyChanged("ReportData");

 

                System.Diagnostics.Debug.WriteLine("Owner {0}, Description {1}", userWidget.Id, userWidget.Description);

            }

        }

 

        public event PropertyChangedEventHandler PropertyChanged;

        private ObservableCollection<ReportsDataItem> reportData;

 

        public ObservableCollection<ReportsDataItem> ReportData

        {

            get

            {

                return reportData;

            }

            set

            {

                reportData = value;

                RaisePropertyChanged("ReportData");

            }

 

        }

 

        private void RaisePropertyChanged(string name)

        {

            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)

            {

                handler(this, new PropertyChangedEventArgs(name));

            }

        }

    } 

}

<UserControl

x:Class="GridApp.Controls.CtlReport"

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

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

xmlns:local="using:GridApp.Controls"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

xmlns:telerikGrid="using:Telerik.UI.Xaml.Controls.Grid"

mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"

x:Name="reportctl">

<StackPanel>

<telerikGrid:RadDataGrid x:Name="ReportGrid"

ItemsSource="{Binding ReportData}"

AutoGenerateColumns="False">

<telerikGrid:RadDataGrid.Columns >

<telerikGrid:DataGridTextColumn PropertyName="Description" Header="Description"/>

<telerikGrid:DataGridTextColumn PropertyName="Id" Header="Owner"/>

</telerikGrid:RadDataGrid.Columns>

</telerikGrid:RadDataGrid>

</StackPanel>

</UserControl>

[Ivaylo Gergov]

Hello Ed,

Thank you for getting back to us.

I tried to reproduce this issue but with no result. It seems that our RadDataGrid works fine with async methods. Today we uploaded a new internal build that fixes several issues in RadDataGrid. Could you please give the latest bits a try and in case you still experience issues I will need a runnable demo project that reproduces the problem so that I can debug it locally and isolate its cause.

I am looking forward to your reply.

 

All the best,
Ivaylo Gergov
the Telerik team

[Ed]

> Today we uploaded a new internal build that fixes several issues in RadDataGrid.
Is there a link to the new build?

The download link still has
RadControlsForWindows8Setup_2013_1_219

[Ivaylo Gergov]

Hello Ed,

In order to have access to internal builds you first have to purchase or download a trial version of our latest official release. Then you can see the internal builds from your account - Manage Products -> Latest Internal Builds.

I hope this information helps.

Regards,
Ivaylo Gergov
the Telerik team

[Ed]

I have logged into my account
Download the Windows 8 RAD Controls (2013_1_219)
Went to Managed Products > Latest internal builds

I see do not see any new builds only
!No internal builds for your products have been uploaded recently.
Has there been any updates past 2013_1_219?

[Apo]

Hi Ed,

Thank you for contacting us.

Could you please provide the e-mail address with which you log into our system as I do not see active licenses or trials under the account of [e-mail].

Looking forward to hearing from you.

Greetings,
Apo
the Telerik team