WCF DataContract Structs - WPF Discussion Boards

2-Jun-09 22:55

You've create a ServiceContract here, but you are using DataMembers. DataMembers belong to DataContracts - not ServiceContracts. In a ServiceContract, you use OperationContract to mark methods that will be consumed. Take another look at the code I gave you, and pay particular attention to which attribute is defined against which type.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: I marked My property with [DataMember] and I still have an exception

Doria22863-Jun-09 0:05

Doria2286

3-Jun-09 0:05

But here it is not a method but a property in my ServiceContract, if I mark it with [operationContract] I have this error:

<big>Attribute 'OperationContract' is not valid on this declaration type. It is only valid on 'method' declarations.</big>

Is it impossible to declare a property in a ServiceContract ?

Re: I marked My property with [DataMember] and I still have an exception

Pete O'Hanlon3-Jun-09 0:14

3-Jun-09 0:14

It's not impossible - you just have to do it slightly differently. What you do, is declare OperationContract on your get and set, so you get:

public int MyProperty
{
  [OperationContract]get;
  [OperationContract]set;
}

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: I marked My property with [DataMember] and I still have an exception

Doria22863-Jun-09 0:19

Doria2286

3-Jun-09 0:19

thank you pete O'Hanlon Big Grin | :-D

, It is what I was looking for and thank you again

Re: I marked My property with [DataMember] and I still have an exception

Pete O'Hanlon3-Jun-09 0:30

3-Jun-09 0:30

You're welcome.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: WCF DataContract Structs

WCF DataContract Structs

Jammer2-Jun-09 1:17

Jammer

2-Jun-09 1:17

Hi All,

I've just noticed something in the Juval Lowy book I'm reading at the mo. He hasn't actually mentioned this in the text but I've noticed that all his DataContract are structs not classes.

Kinda makes sense really, are you WCF'ers out there tending to do the same with your DCs?

Cheers,

Jammer
My Blog | Article(s)

Pete O'Hanlon2-Jun-09 1:34

2-Jun-09 1:34

Nope, and here are my reasons:

If your contract isn't small, a struct doesn't make much sense. If we assume you have non-trivial data, then the stack usage more than outweighs the prevention of heap allocation that structs bring to the table.
You cannot use default constructors or field initializers with structs, which we use a fair bit.
Structs tend to make sense when they are used in lots of places. Assuming that they don't form a large part of your architecture, then you aren't going to see much benefit from them.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

Re: WCF DataContract Structs

Jammer2-Jun-09 8:10

Jammer

2-Jun-09 8:10

Hi Pete,

I was just thinking about in terms of the internal server farm project I'm working on. I've designed a set of base data classes for our database team to use in relation to reading data from the DB and then shoving it down the pipe to a WCF service. They are small data classes.

Might need to do some testing around this to help weigh up the pros and cons.

Cheers,

Jammer
My Blog | Article(s)

Databinding?

#realJSOP1-Jun-09 23:51

1-Jun-09 23:51

I have a form that has several labels that are updated on a regular basis. I was under the assumption that if I set up a proper class (inheriting from INotifyPropertyChanged), events would be sent to the form whenever a property changed. So, I wrote this (abbreviated to avoid boring you):

public class FormProperties : INotifyPropertyChanged
{
    private string m_scrambledWord;
 
    public string ScrambledWord
    {
        get { return m_scrambledWord; }
        set 
        {
            m_scrambledWord = value;
            OnPropertyChanged("ScrambledWord");
        }
    }

    public FormProperties()
    {
        m_scrambledWord = "test";
    }

    public event PropertyChangedEventHandler PropertyChanged;                
    protected void OnPropertyChanged(string propertyName)                    
    {                                                                        
        if (this.PropertyChanged != null)                                    
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }                                                                       
}

And in the form, I'm doing this:

FormProperties m_formProperties = new FormProperties();

Finally, I'm doing this in the XAML:

<Window x:Class="AnagramsWPF.WindowMain"
		x:Name="MainWindow"
		xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
		xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
		xmlns:local="clr-namespace:AnagramsWPF"
		Title="Anagrams/WPF" 
		Height="566" Width="487" 
		FontFamily="Arial" FontSize="13"
		DataContext="m_formProperties">  <----------------

    <Grid>
        <TextBox Name="textboxScrambled" 
				 Height="23" 
				 Width="126" 
				 HorizontalAlignment="Left" 
				 VerticalAlignment="Top" 
				 Margin="111,6,0,0" 
				 IsReadOnly="True" 
				 MaxLines="1" 
				 MaxLength="10" 
				 CharacterCasing="Upper" 
				 Text="{Binding Path=ScrambledWord, Mode=OneWay}" />
    </Grid>
</Window>

I was expecting the form to be initialized with the associated textbox being set to "test". What am I doing wrong?

BTW, this databinding stuff seems like it's the long way around to setting the controls on a form.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Pete O'Hanlon2-Jun-09 0:04

2-Jun-09 0:04

John - your problem is in the constructor:

m_scrambledWord = "test";

As you are setting the member directly, the property isn't invoked - hence, the notification mechanism doesn't fire. Change this to:

ScrambledWord = "test";

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

#realJSOP2-Jun-09 0:08

2-Jun-09 0:08

Still no workee. :/

ABitSmart2-Jun-09 0:39

ABitSmart

2-Jun-09 0:39

You cannot bind to a field. You would have to expose it as a CLR property.

Pete O'Hanlon2-Jun-09 0:40

2-Jun-09 0:40

I really should read these posts more carefully. What you need to do is set your binding up explicitly, as in:

<Window x:Class="JsopBinding.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Window1" Height="300" Width="300" x:Name="myWindow"> <-- Set the name here - you need it below -->
  <Window.DataContext>
    <Binding ElementName="myWindow" Path="Properties" /> <-- Now, set up the data context binding -->
  </Window.DataContext>
  <Grid>
    <TextBox 
      Name="textboxScrambled" 				 
      Height="23" 				 
      Width="126" 				 
      HorizontalAlignment="Left" 				 
      VerticalAlignment="Top" 				 
      Margin="111,6,0,0" 				 
      IsReadOnly="True" 				 
      MaxLines="1" 				 
      MaxLength="10" 				 
      CharacterCasing="Upper" 				 
      Text="{Binding Path=ScrambledWord, Mode=OneWay}" />
  </Grid>
</Window>

And, in your code behind you add the property:

public FormProperties Properties
{
    get { return m_formProperties; }
    set { m_formProperties = value; }
}

Alternatively, you can assign your datacontext directly in the code behind as

this.DataContext = m_formProperties;

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

#realJSOP2-Jun-09 2:25

2-Jun-09 2:25

Yeah, that worked (setting up a property that gets/sets the ForumProperties).

Many thanks, oh great and powerful Oz. Smile | :)

Pete O'Hanlon2-Jun-09 2:32

2-Jun-09 2:32

You are soooo welcome, now let's go and trample on some egos.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

#realJSOP2-Jun-09 3:11

2-Jun-09 3:11

Pete O'Hanlon wrote:
now let's go and trample on some egos.

I do that at every opportunity. However, I believe in fair play, and therefore feel that I must wait for someone to actually step on their dick before I point and laugh.

Pete O'Hanlon2-Jun-09 3:16

2-Jun-09 3:16

I prefer to be pre-emptive. When I passed 40, I realised that I enjoyed being a grumpy old sod, so I didn't have to worry about any touchy feely crap.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

#realJSOP2-Jun-09 3:28

2-Jun-09 3:28

I find that waiting for some idiot to provide me with a basis for my comments allows me to better organize my thoughts.

List Control in WPF

krishnan.s1-Jun-09 21:45

krishnan.s

1-Jun-09 21:45

Hi ,
I need to develop a Custom List control in WPF in which i need to customize the list header,the list selection,list background and need to add images to the listitem. I have created like this one in MFC with ownerdraw but not aware of WPF. Can anyone let me know some articles helping me to develop one.

Thanks

Re: List Control in WPF

Pete O'Hanlon1-Jun-09 23:10

1-Jun-09 23:10

Why do you need to create a custom list control? The whole point behind the controls in WPF is that they are "lookless". In other words, their behaviour is separated from the visuals, so you can restyle existing controls with relative ease.

Here's a (pretty completely) restyled version of a ListBox (thanks to KaXAML):

<Style x:Key="{x:Static GridView.GridViewScrollViewerStyleKey}" TargetType="{x:Type ScrollViewer}">
   <Setter Property="Template">
  <Setter.Value>
    <ControlTemplate TargetType="{x:Type ScrollViewer}">
   <Grid Background="{TemplateBinding Background}">
     <Grid.ColumnDefinitions>
    <ColumnDefinition Width="*"/>
    <ColumnDefinition Width="Auto"/>
     </Grid.ColumnDefinitions>
     <Grid.RowDefinitions>
    <RowDefinition Height="*"/>
    <RowDefinition Height="Auto"/>
     </Grid.RowDefinitions>
     <DockPanel Margin="{TemplateBinding Padding}">
    <ScrollViewer
      DockPanel.Dock="Top"
      Focusable="false"
      HorizontalScrollBarVisibility="Hidden"
      VerticalScrollBarVisibility="Hidden">
      <GridViewHeaderRowPresenter
     Margin="2,0,2,0"
     AllowsColumnReorder="{Binding Path=TemplatedParent.View.AllowsColumnReorder,RelativeSource={RelativeSource TemplatedParent}}"
     ColumnHeaderContainerStyle="{Binding Path=TemplatedParent.View.ColumnHeaderContainerStyle,RelativeSource={RelativeSource TemplatedParent}}"
     ColumnHeaderContextMenu="{Binding Path=TemplatedParent.View.ColumnHeaderContextMenu,RelativeSource={RelativeSource TemplatedParent}}"
     ColumnHeaderTemplate="{Binding Path=TemplatedParent.View.ColumnHeaderTemplate,RelativeSource={RelativeSource TemplatedParent}}"
     ColumnHeaderTemplateSelector="{Binding Path=TemplatedParent.View.ColumnHeaderTemplateSelector,RelativeSource={RelativeSource TemplatedParent}}"
     ColumnHeaderToolTip="{Binding Path=TemplatedParent.View.ColumnHeaderToolTip,RelativeSource={RelativeSource TemplatedParent}}"
     Columns="{Binding Path=TemplatedParent.View.Columns,RelativeSource={RelativeSource TemplatedParent}}"
     SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
    </ScrollViewer>
    <ScrollContentPresenter Name="PART_ScrollContentPresenter" KeyboardNavigation.DirectionalNavigation="Local"/>
     </DockPanel>
     <ScrollBar
    Name="PART_HorizontalScrollBar"
    Grid.Row="1"
    Maximum="{TemplateBinding ScrollableWidth}"
    Orientation="Horizontal"
    Value="{TemplateBinding HorizontalOffset}"
    ViewportSize="{TemplateBinding ViewportWidth}"
    Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>
     <ScrollBar
    Name="PART_VerticalScrollBar"
    Grid.Column="1"
    Maximum="{TemplateBinding ScrollableHeight}"
    Value="{TemplateBinding VerticalOffset}"
    ViewportSize="{TemplateBinding ViewportHeight}"
    Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"/>
   </Grid>
    </ControlTemplate>
  </Setter.Value>
   </Setter>
 </Style>
 <Style x:Key="GridViewColumnHeaderGripper" TargetType="{x:Type Thumb}">
   <Setter Property="Width" Value="18"/>
   <Setter Property="Background" Value="#404040"/>
   <Setter Property="Template">
  <Setter.Value>
    <ControlTemplate TargetType="{x:Type Thumb}">
   <Border Background="Transparent" Padding="{TemplateBinding Padding}">
     <Rectangle Width="1" HorizontalAlignment="Center" Fill="{TemplateBinding Background}"/>
   </Border>
    </ControlTemplate>
  </Setter.Value>
   </Setter>
 </Style>
 <Style x:Key="{x:Type GridViewColumnHeader}" TargetType="{x:Type GridViewColumnHeader}">
   <Setter Property="HorizontalContentAlignment" Value="Center"/>
   <Setter Property="VerticalContentAlignment" Value="Center"/>
   <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
   <Setter Property="Template">
  <Setter.Value>
    <ControlTemplate TargetType="{x:Type GridViewColumnHeader}">
   <Grid>
     <Border
    Name="HeaderBorder"
    Background="#E0E0E0"
    BorderBrush="#404040"
    BorderThickness="0,1,0,1"
    Padding="2,0,2,0">
    <ContentPresenter
      Name="HeaderContent"
      HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
      Margin="0,0,0,1"
      VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
      RecognizesAccessKey="True"
      SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
     </Border>
     <Thumb
    x:Name="PART_HeaderGripper"
    HorizontalAlignment="Right"
    Margin="0,0,-9,0"
    Style="{StaticResource GridViewColumnHeaderGripper}"/>
   </Grid>
   <ControlTemplate.Triggers>
     <Trigger Property="IsMouseOver" Value="true">
    <Setter TargetName="HeaderBorder" Property="Background" Value="#C0C0C0"/>
     </Trigger>
     <Trigger Property="IsPressed" Value="true">
    <Setter TargetName="HeaderBorder" Property="Background" Value="#E0E0E0"/>
    <Setter TargetName="HeaderContent" Property="Margin" Value="1,1,0,0"/>
     </Trigger>
     <Trigger Property="IsEnabled" Value="false">
    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
     </Trigger>
   </ControlTemplate.Triggers>
    </ControlTemplate>
  </Setter.Value>
   </Setter>
   <Style.Triggers>
  <Trigger Property="Role" Value="Floating">
    <Setter Property="Opacity" Value="0.7"/>
    <Setter Property="Template">
   <Setter.Value>
     <ControlTemplate TargetType="{x:Type GridViewColumnHeader}">
    <Canvas Name="PART_FloatingHeaderCanvas">
      <Rectangle Width="{TemplateBinding ActualWidth}" Height="{TemplateBinding ActualHeight}" Fill="#60000000"/>
    </Canvas>
     </ControlTemplate>
   </Setter.Value>
    </Setter>
  </Trigger>
  <Trigger Property="Role" Value="Padding">
    <Setter Property="Template">
   <Setter.Value>
     <ControlTemplate TargetType="{x:Type GridViewColumnHeader}">
    <Border
      Name="HeaderBorder"
      Background="#E0E0E0"
      BorderBrush="#404040"
      BorderThickness="0,1,0,1"/>
     </ControlTemplate>
   </Setter.Value>
    </Setter>
  </Trigger>
   </Style.Triggers>
 </Style>
 <Style x:Key="{x:Type ListView}" TargetType="{x:Type ListView}">
   <Setter Property="SnapsToDevicePixels" Value="true"/>
   <Setter Property="OverridesDefaultStyle" Value="true"/>
   <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
   <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
   <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
   <Setter Property="VerticalContentAlignment" Value="Center"/>
   <Setter Property="Template">
  <Setter.Value>
    <ControlTemplate TargetType="{x:Type ListView}">
   <Border
     Name="Border"
     Background="#FFFFFF"
     BorderBrush="#888888"
     BorderThickness="1">
     <ScrollViewer Style="{DynamicResource {x:Static GridView.GridViewScrollViewerStyleKey}}">
    <ItemsPresenter/>
     </ScrollViewer>
   </Border>
   <ControlTemplate.Triggers>
     <Trigger Property="IsGrouping" Value="true">
    <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
     </Trigger>
     <Trigger Property="IsEnabled" Value="false">
    <Setter TargetName="Border" Property="Background" Value="#AAAAAA"/>
     </Trigger>
   </ControlTemplate.Triggers>
    </ControlTemplate>
  </Setter.Value>
   </Setter>
 </Style>
 <Style x:Key="{x:Type ListViewItem}" TargetType="{x:Type ListViewItem}">
   <Setter Property="SnapsToDevicePixels" Value="true"/>
   <Setter Property="OverridesDefaultStyle" Value="true"/>
   <Setter Property="Template">
  <Setter.Value>
    <ControlTemplate TargetType="{x:Type ListBoxItem}">
   <Border
     Name="Border"
     Background="Transparent"
     Padding="2"
     SnapsToDevicePixels="true">
     <GridViewRowPresenter VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
   </Border>
   <ControlTemplate.Triggers>
     <Trigger Property="IsSelected" Value="true">
    <Setter TargetName="Border" Property="Background" Value="#DDDDDD"/>
     </Trigger>
     <Trigger Property="IsEnabled" Value="false">
    <Setter Property="Foreground" Value="#888888"/>
     </Trigger>
   </ControlTemplate.Triggers>
    </ControlTemplate>
  </Setter.Value>
   </Setter>
 </Style>

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.