NullReferenceException on most UXPage XAML files

lawton@xogent.com — Tue, 24 Feb 2015 19:00:32 GMT

After upgrading from 8.0.5000 to 10.0.5000 and persisting through 11.0.5000, most of the UXPage xaml pages in my silverlight app show the following error:

NullReferenceException: Object reference not set to an instance of an object.

StackTrace

at MS.Internal.XcpImports.CheckHResult(UInt32 hr)

at MS.Internal.XcpImports.FontFamily_GetFamilyName(CValue& element)

at MS.Internal.XcpImports.ConvertCValueForManagedWithType(Type propertyType, CValue& outVal, Int32 outDOType, Boolean releaseObjectReference, Boolean deleteBuffer, IManagedPeerBase fromObject)

at MS.Internal.XcpImports.GetManagedPropertyValueFromStyle(Boolean useBuiltInStyle, IManagedPeerBase obj, DependencyProperty property, Object& value)

at System.Windows.FrameworkElement.GetValueFromStyle(DependencyProperty property, Object& value)

at System.Windows.DependencyObject.EvaluateBaseValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)

at System.Windows.DependencyObject.EvaluateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry newEntry, ValueOperation operation)

at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)

at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty property)

at MS.Internal.FrameworkCallbacks.InvalidateProperty(InPtr nativeTarget, UInt32 propertyId)

InnerException: None

I have deleted the obj and bin folders.

I have updated all references.

If I delete a section of the XAML, and then add it back, it will show the design view again.

Any guidance?

How to add rows programmatically?

mpeet — Thu, 02 Jun 2011 16:19:11 GMT

I am new to this control. I want to add rows to a WebGrid programmatically. I want the WebGrid to be unbound from any database. I want to use asp.net controls within the cells, so I am using templates. I keep getting a NullReferenceException.

Here is a simple example demonstrating my problem:

<ISWebGrid:WebGrid ID="WebGrid1" Height="300px" Width="100%" UseDefaultStyle="True" runat="server" >
    <RootTable>
        <Columns>
            <ISWebGrid:WebGridColumn Name="col1" Bound="false" ColumnType="Template">
                <CellTemplate>
                    <asp:TextBox ID="txt1" runat="server" />
                </CellTemplate>
            </ISWebGrid:WebGridColumn>
        </Columns>
    </RootTable>
</ISWebGrid:WebGrid>

Code-behind:

    protected void Page_Load(object sender, EventArgs e)
    {
        WebGrid1.InitializeRow += new RowEventHandler(WebGrid1_InitializeRow);
        WebGridRow row = WebGrid1.RootTable.CreateRow();
        WebGrid1.RootTable.Rows.Add(row);
    }
    void WebGrid1_InitializeRow(object sender, RowEventArgs e)
    {
        if (e.Row.Type == RowType.Record)
        {
            WebGridRow row = (WebGridRow)e.Row;
            WebGridCellTemplateContainer cell = row.Cells[0].GetTemplateContainer();    // <-- always comes back null
            TextBox txt1 = (TextBox)cell.FindControl("txt1");
        }
    }

The problem is that the call to GetTemplateContainer() always returns null and i can't figure out why.

What am I doing wrong?

Thanks in advance,

Mike

Intersoft Community - NullReferenceException

NullReferenceException on most UXPage XAML files

How to add rows programmatically?