About the author

Brian Keating is a developer addicted to Microsoft Technologies.

Month List

RecentComments

Comment RSS

Xaml gotya

clock December 6, 2010 19:51 by author Brian Keating |

Here's one I'm ashamed to admit caught me as I was finishing up work this evening, it's been a good few weeks since I've gone near wpf/silverlight given I was on holidays and spend my time playing with WF4 and MVC2.

Anyway in screenshot below.. vs2010 .net 3.5 sp1 I was binding some data to a datagrid.

 I omitted to remove the offending closing xml comment you can see in the xaml "-->"

And low and behold the binding breaks down without any prior warning,,,, infact my object collection is totally ignored and the "-->" is passed to the binding, I know this because I removed the binding paths in the columns and was presented with "-->" in my grid...

Just an interesting one to keep in mind.. If you're like me, u couldn't switch off the computer this evening until this peculiar behaviour was explained..

 

Maybe it will save you some time if you come accross it.

 



Tags:
Categories: Silverlight | WPF
Actions: E-mail | Permalink | commentComments (0) | RSS comment feedXaml gotya

WaitCursor and MVVM

clock June 3, 2010 16:43 by author Brian Keating |

Ever wondered how to display the correct cursor in an application that is databinded to async methods?

Pretty easy solution, just databind the cursor on the window itself.

Here's how:

  • Add an IsBusy property on the DataContext (and implement INotifyPropertyChanged on it)
  • Addt the following to your window xaml

xmlns:valueConverters="clr-namespace:XXX.ValueConverters"
Cursor="{Binding IsBusy, Converter={valueConverters:CursorExtensionConverter}}" 

 

  • Create the following ValueConverter

public class CursorExtensionConverter : MarkupExtension, IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value != null && ((bool)value))
            return Cursors.Wait;           
        else
            return Cursors.Arrow;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        return instance;
    }

    private static CursorExtensionConverter instance = new CursorExtensionConverter();
}

 

Note: Use of MarkupExtension

 

 



Tags:
Categories: Silverlight | WPF
Actions: E-mail | Permalink | commentComments (0) | RSS comment feedWaitCursor and MVVM

WPF ListViewItem Commands with MVVM pattern

clock May 12, 2010 10:44 by author Brian Keating |

If you're interested to see how to attach commands to listview items for use with an implementation of the MVVM pattern, have a look at this.

 

<Style x:Key="Local_OpenEntityStyle"
           TargetType="{x:Type ListViewItem}">
        <Setter Property="acb:CommandBehavior.Event"
                        Value="MouseDoubleClick" />
        <Setter Property="acb:CommandBehavior.Command"
                        Value="{Binding ElementName=uiEntityListDisplay, Path=DataContext.OpenEntityCommand}" />
        <Setter Property="acb:CommandBehavior.CommandParameter"
                        Value="{Binding}" />
</Style>

 

Here the command to be fired on the MouseDoubleClick event is set, the CommandParameter, will be the data object that we click on.



Tags:
Categories: WPF | MVVM
Actions: E-mail | Permalink | commentComments (0) | RSS comment feedWPF ListViewItem Commands with MVVM pattern

Declarative Ria Data and Controls

clock March 24, 2010 21:27 by author Brian Keating |

I'm really loving this declarative approach with silverlight and wpf... (ask me why and I can't tell you ! :-)

Anyway I've just stumbled across a way of managing RiaDataContexts Declaratively
I found it on the Telerik samples.... If you've not looked at these guys controls then check them out!!

 

<navigation:Page xmlns:dataFormToolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.DataForm.Toolkit"  xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
  x:Class="SiteDocs.Loler"
  xmlns="//schemas.microsoft.com/winfx/2006/xaml/presentation">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"
  xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
  xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"
  xmlns:riaControls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Ria"
  xmlns:e="clr-namespace:SiteDocs.Web.Services"
  xmlns:riaData="clr-namespace:System.Windows.Data;assembly=System.Windows.Controls.Ria"
  mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480" 
  Style="{StaticResource PageStyle}"
>

  <Grid x:Name="LayoutRoot" >
    <ScrollViewer x:Name="PageScrollViewer" Style="{StaticResource PageScrollViewerStyle}" >

            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition />
                </Grid.ColumnDefinitions>
    
    <Grid x:Name="gridLolerLeft" >
     <Grid.RowDefinitions>
      <RowDefinition />
      <RowDefinition Height="Auto"/>
     </Grid.RowDefinitions>

                    <riaControls:DomainDataSource x:Name="DomainDataSource1" AutoLoad="True" QueryName="GetLolers" PageSize="10">
                        <riaControls:DomainDataSource.DomainContext>
                            <e:LolerContext />
                        </riaControls:DomainDataSource.DomainContext>
                        <riaControls:DomainDataSource.FilterDescriptors>
                            <riaData:FilterDescriptorCollection LogicalOperator="Or" />
                        </riaControls:DomainDataSource.FilterDescriptors>
                    </riaControls:DomainDataSource>

                    <telerik:RadGridView x:Name="RadGridView1" ItemsSource="{Binding Data, ElementName=DomainDataSource1}"
                             Filtering="RadGridView1_Filtering" IsBusy="{Binding IsBusy, ElementName=DomainDataSource1}" />
           <telerik:RadDataPager x:Name="RadDataPager1" Grid.Row="1" Source="{Binding Data, ElementName=DomainDataSource1}" DisplayMode="FirstLastPreviousNextNumeric, Text" IsTotalItemCountFixed="True"/>

    
    </Grid>

                </Grid>
    </ScrollViewer>
  </Grid>

</navigation:Page>



Tags:
Categories: RIA Services | Silverlight | WPF
Actions: E-mail | Permalink | commentComments (0) | RSS comment feedDeclarative Ria Data and Controls

Popups in wpf

clock March 17, 2010 17:14 by author Brian Keating |

Here is come code to show a popup in wpf, i've nothing in the popup at the moment, just a gradient background and border.

<Popup Name="popup1" 
   Width="{Binding ElementName=bdrCalendar, Path=ActualWidth, Converter={StaticResource MarginValueConverter}}"
   Height="150"
   Placement="Center"
   PopupAnimation="Scroll"
   AllowsTransparency="True"
   PlacementTarget="{Binding ElementName=bdrCalendar}"
   MouseDown="popup1_MouseDown" >
 <ctrls:PopupContent />
</Popup>

 

 

 

 



Tags:
Categories: WPF
Actions: E-mail | Permalink | commentComments (0) | RSS comment feedPopups in wpf