Unhandled exception refreshing grid second time | Infragistics Forums

115

Unhandled exception refreshing grid second time

d v posted over 16 years ago

Hi:

I am getting the following exception when underlying datasource is changed. Help!!! I am using Model-View-Presenter pattern and setting datacontext for the page. Data is displayed correctly first time ( No Exceptions) and when i change the underying datasource in response to a menuitem i get the exception

Thanks

David

Xaml fragment for the grid is as follows

<igDP:XamDataGrid Margin="0,32,0,0" x:Name="igGridDocuments" Style="{StaticResource readOnlyGrid}" DataSource="{Binding Path=Requests.Tables[0]}">

DataContext is set as follows

public AdminPage()

{

InitializeComponent();

_viewModel = new ViewModels.AdminPageViewModel(this);

CommandBindingCollection commandBindings = _viewModel.CommandBindings;

this.CommandBindings.AddRange(commandBindings);

this.DataContext = _viewModel;

}

Exception

---------------------------
Unhandled Exception
---------------------------
System.InvalidOperationException: Must call EndGeneration before calling BeginGeneration again.

at Infragistics.Windows.Virtualization.RecyclingItemContainerGenerator.BeginGeneration(ScrollDirection scrollDirection)

at Infragistics.Windows.Virtualization.RecyclingItemsPanel.BeginGeneration(ScrollDirection scrollDirection)

at Infragistics.Windows.DataPresenter.GridViewPanel.MeasureOverride(Size availableSize)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)

at System.Windows.Controls.ItemsPresenter.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)

at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)

at System.Windows.Controls.ScrollContentPresenter.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.ScrollViewer.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Control.MeasureOverride(Size constraint)

at Infragistics.Windows.DataPresenter.RecordListControl.MeasureOverride(Size availableSize)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Border.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Control.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.DockPanel.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)

at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Border.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Page.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)

at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Decorator.MeasureOverride(Size constraint)

at System.Windows.Documents.AdornerDecorator.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Grid.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.DockPanel.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Controls.Border.MeasureOverride(Size constraint)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.Window.MeasureOverrideHelper(Size constraint)

at System.Windows.Window.MeasureOverride(Size availableSize)

at System.Windows.FrameworkElement.MeasureCore(Size availableSize)

at System.Windows.UIElement.Measure(Size availableSize)

at System.Windows.ContextLayoutManager.UpdateLayout()

at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)

at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()

at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()

at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)

at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)

at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)

at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
---------------------------
OK
---------------------------

Parents

115

d v posted over 16 years ago

Thanks Joe , Philipp . I am using 7.2 controls. Philipp is correct these exceptions are popping out like mad and it turned out to be an editor style using a value convertor to display User Names from UserIds. Once i remove this editor style i do not get these exceptions, . I am using ValueConverters with other fields ( all of them happened to be DataType String ) while UserId is an int32. For now i have removed the editor style to kepp moving.

Thanks

David

Relavant XAML fragments

<Page.Resources>

<vw:DocumentStatusConverter x:Key="documentStatusConverter" />

<vw:RequestStatusConverter x:Key="requestStatusConverter" />

<vw:UserIdConverter x:Key="userIdConverter" />

<vw:DateRangeConverter x:Key="dateRangeConverter" />
</Page.Resources>
<igDP:Field Name="ASSIGNED_TO" Label="User" DataType="System:Int32">

<igDP:Field.Settings>

<igDP:FieldSettings CellWidth="200" LabelWidth="120" >


</igDP:FieldSettings>

</igDP:Field.Settings>
</igDP:Field>


<igDP:Field Name="STATUS" Label="Status" DataType="System:String">

<igDP:Field.Settings>

<igDP:FieldSettings CellWidth="200" LabelWidth="200">

<igDP:FieldSettings.EditorStyle>

<Style TargetType="{x:Type igEditors:XamTextEditor}" >

<Setter Property="ValueToDisplayTextConverter" Value="{StaticResource requestStatusConverter}"/>

<Setter Property="ValueToTextConverter" Value="{StaticResource requestStatusConverter}"/>

</Style>

</igDP:FieldSettings.EditorStyle>

</igDP:FieldSettings>

</igDP:Field.Settings>

</igDP:Field>
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2070

[Infragistics] Sandip Patel posted over 16 years ago in reply to d v

Hi David,

I'm not sure why a value converter would create the kind of exception call stack that you posted originally. Can you post the value converter code so I can try it out here.

Thanks,
Sandip
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115

d v posted over 16 years ago in reply to [Infragistics] Sandip Patel

Hi Sandip:

I can reproduce the exception consistently with above call stack when editror syle is uncommented. I am posting the code for value converter and static class value converter is calling

Thanks

David

public class UserIdConverter : IValueConverter

{

// Convert gets called to convert value to text.
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
Int32 userId = -100; if (value is Int32 && value != null && value != DBNull.Value )
{
userId = (Int32)value;
}

string userName = string.Empty;
if ( userId != -100)
{
userName = SecurityService.GetUserName(userId);
}
return userName;
}

// ConvertBack gets called to convert user input into to value.
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string userName = string.Empty;if (value is string && value != null && value != DBNull.Value )
{
userName = (string)value;
}

int userId = -100;
if (userName.Length > 0)
{
userId = SecurityService.GetUserId(userName);
}
return userId;
}

}

--- Code for SecurityService class is as follows

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Windows;
using System.Windows.Controls;
using VistaSG.Common;
using VistaSG.Security.DataContracts;

namespace VistaSG.ReviewClient
{

    public static class SecurityService
    {

        private static CustomClientChannel<VistaSG.Security.Services.IUser> _serviceChannel = null;
        private static VistaSG.Security.Services.IUser _serviceClient = null;

        private static DataSet _userNames = null;

        public static void InitializeComponent()
        {
            if (_serviceChannel == null)
            {
                _serviceChannel = new CustomClientChannel<VistaSG.Security.Services.IUser>("UserService", ConfigurationOptionsService.ServiceConfigurationFileName);
                if (_serviceChannel != null)
                {
                    _serviceClient = _serviceChannel.CreateChannel();
                }

            }

        }

        public static void DisposeComponent()
        {
            if (_serviceChannel != null)
            {
                _serviceChannel.Close();
                _serviceChannel = null;
            }

        }

        public static DataSet GetUsers()
        {
            DataSet ds = GetUsers(true);
            return ds;
        }

        public static DataSet GetUsers(bool includeCommonUser)
        {
            DataSet ds = null;
            try
            {
                if (_userNames == null)
                {
                    InitializeComponent();
                    string userXml = _serviceClient.GetUsers();
                    if (userXml.Length > 0)
                    {
                        ds = UtiltyMethods.GetDataSetFromString(userXml);
                        if (includeCommonUser && ds != null && ds.Tables.Count > 0)
                        {
                            DataRow newUserRow = ds.Tables[0].NewRow();
                            newUserRow.BeginEdit();
                            newUserRow["USER_ID"] = -1;
                            newUserRow["DISPLAY_NAME"] = "COMMON";
                            newUserRow.EndEdit();
                            ds.Tables[0].Rows.InsertAt(newUserRow, 0);
                            ds.AcceptChanges();
                        }
                    }
                    if (ds != null && ds.Tables.Count > 0)
                    {
                        _userNames = ds;
                    }
                }
                else
                {
                    ds = _userNames;
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "Get Users", MessageBoxButton.OK, MessageBoxImage.Error);

            }
            return ds;
        }

        public static string GetUserName(int userId)
        {
            string userName = string.Empty;
            try
            {
                // if we can't find userid we will simply return id as name
                userName = userId.ToString();
                GetUsers(true);
                if ( _userNames != null && _userNames.Tables.Count > 0 && _userNames.Tables[0].Rows.Count > 0 )
                {
                    DataRow dr = _userNames.Tables[0].Rows.Find(userId ) ;
                    if (dr != null)
                    {
                        userName = Convert.ToString(dr["DISPLAY_NAME"]);
                    }

                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "Get User Name", MessageBoxButton.OK, MessageBoxImage.Error);

            }
            return userName;
        }

        public static int GetUserId(string userName)
        {
            int userId = -100;
            try
            {
                GetUsers(true);
                if (_userNames != null && _userNames.Tables.Count > 0 && _userNames.Tables[0].Rows.Count > 0)
                {
                    string filterExpression = "DISPLAY_NAME='" + userName + "'";
                    DataRow[ matchingRows = _userNames.Tables[0].Select(filterExpression);
                    if ( matchingRows != null && matchingRows.Length > 0 )
                    {
                        userId = Convert.ToInt32(matchingRows[0]["USER_ID"]);
                    }

                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "Get User Id", MessageBoxButton.OK, MessageBoxImage.Error);

            }
            return userId ;
        }

    }
}
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Philipp Sumi posted over 16 years ago in reply to d v

Have you tried setting a break point in the converter? If the conversion causes the error, you will get the source of the problem in debug mode as the BeginGeneration exceptions just occur if the exception hits through...
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115

d v posted over 16 years ago in reply to Philipp Sumi

Hello AllI am not sure but I am to resolve my problem by changing field editor style to use NumericEditor. I am guessing “element recycling logic” is not working correctly when editor style is set to use an editor different from the default one for the data type. Any how I am glad It is working. Also setting the “RecordContainerGenerationMode” to “Virtualize” does not cause exception.Thanks for all your helpDavid This xaml fragment works       <igDP:Field Name="ASSIGNED_TO" Label="User" DataType="System:Int32">
            <igDP:Field.Settings>
                    <igDP:FieldSettings CellWidth="200"   LabelWidth="120" >
                          <igDP:FieldSettings.EditorStyle>
                                   <Style TargetType="{x:Type igEditors:XamNumericEditor}" >
                                         <Setter Property="ValueToDisplayTextConverter" Value="{StaticResource userIdConverter}"/>
                                                <Setter Property="ValueToTextConverter" Value="{StaticResource userIdConverter}"/>
                                      </Style>
                              </igDP:FieldSettings.EditorStyle>
                      </igDP:FieldSettings>
                </igDP:Field.Settings>
         </igDP:Field>This throws exception second time around!!      <igDP:Field Name="ASSIGNED_TO" Label="User" DataType="System:Int32">
            <igDP:Field.Settings>
                    <igDP:FieldSettings CellWidth="200"   LabelWidth="120" >
                          <igDP:FieldSettings.EditorStyle>
                                   <Style TargetType="{x:Type igEditors:XamTextEditor}" >
                                         <Setter Property="ValueToDisplayTextConverter" Value="{StaticResource userIdConverter}"/>
                                                <Setter Property="ValueToTextConverter" Value="{StaticResource userIdConverter}"/>
                                      </Style>
                              </igDP:FieldSettings.EditorStyle>
                      </igDP:FieldSettings>
                </igDP:Field.Settings>
         </igDP:Field>This works also !!      <igDP:Field Name="ASSIGNED_TO" Label="User" DataType="System:Int32">
            <igDP:Field.Settings>
                    <igDP:FieldSettings CellWidth="200"   LabelWidth="120" EditAsType="System:String">
                          <igDP:FieldSettings.EditorStyle>
                                   <Style TargetType="{x:Type igEditors:XamTextEditor}" >
                                         <Setter Property="ValueToDisplayTextConverter" Value="{StaticResource userIdConverter}"/>
                                                <Setter Property="ValueToTextConverter" Value="{StaticResource userIdConverter}"/>
                                      </Style>
                              </igDP:FieldSettings.EditorStyle>
                      </igDP:FieldSettings>
                </igDP:Field.Settings>
         </igDP:Field>
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