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Ahh, the perennial problem of what makes a good WPF application. Most of the time, the reasoning that you will be given will be parroted without actually understanding what and why it's really so.
In any case, most of the time what people are referring to is using MVVM. I would suggest that you search for the MSDN article on MVVM by Josh Smith. You might, also, look at one of the popular MVVM frameworks such as Cinch by Sacha Barber which has lots of documentation here on Code Project.
Unfortunately I am typing this on my phone so I can't give you direct links. They are easy to find though.
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Try using Expression Blend, I used it to get me started with WPF and it helped me alot.
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MVVM seems to be the appropriate style everyone can agree upon for WPF. My problem is with certain third party controls you can't use MVVM. I use Actipro Software's WPF ribbon for example and it doesn't support MVVM. Another issue I've had with MVVM is using Treeview controls and responding to the node selected. While there are way to do it in MVVM it seems way more difficult then simply using Visual Studio to create the events. The whole purpose is to separate the code from the XAML by using binding. While I do practice this for the most part sometimes you just can't justify writing something that has a learning curve which increases the projects time to complete by two fold. It boils down in my opinion to what ever method works best for you and the company you work for. I have a much better understanding of MVVM now than I had but it doesn't help to try to learn a new style of programming using controls that aren't designed to work with that style.
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Ahh, the halcyon days of RPGLE - how I miss them (not!)
ljv_az wrote: Everybody has a different opinion on what is the right way to do it.
There's the clue to your dilemma; there is no 'right' way of doing WPF. You might decide to use MVVM or you might not - doesn't make it 'wrong'. In RPG you might use an 'if' or you might use one of those 'two-digits in a column that act like an if' things (it's been a while!) neither is 'wrong' it's often down to personal preference. (I had a manager who insisted on using the logic cycle in programs - but his reasons were, essentially, because that's what he was used to, coming from an RPG II background)
My rule of thumb is to listen to the REASONS people give for doing things one way (or not doing them that way) and make your own mind up.
Someone saying 'you shouldn't put any code in the code-behind' for example, is less than useless without the addition of a 'because...' If you listen to the 'because' bit you can then make up your own mind whether that's the 'right' way or not, and formulate your own rules; then next time someone criticises your code, you can respond with reasoned argument.
I've
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Tengo Un ComboBox en WPF Que relleno MEDIANTE la ejecucion de las Naciones Unidas Procedure almacenado de SQL Server, con los NOMBRES de los Autores de determinados artículos de prensa. Hasta Ahí Perfectamente. El Problema Viene when despues de select sin autor (Apellidos, Nombre) Solicitar y Que me descomponga la Cadena MEDIANTE la división function (',') me da error al no encontrar El Segundo Elemento del array. La explicación está en Que intenta descomponer el Siguiente Resultado de la selección española en el ComboBox: ComboBoxWPF_LINQ_01.usp_ListadoCompletoAutoresResult, siendo ComboBoxWPF_LINQ_01 el Nombre de la Solución y usp_ListadoCompletoAutores el Procedure almacenado Que ejecuto párrafo llenar el ComboBox. Que el Código utilizo es el Siguiente: MostrarAutor private void () {string oAutor, oApellidos , oNombre; string [] CadenaSeparada; DataClasses1DataContext db = new DataClasses1DataContext (); . cboAutores.ItemSource db.usp_ListadoCompletoAutores = () ToList (); oAutor = cboAutotes.Text.ToString; CadenaSeparada = oAutor.Split (','); textBox1 . = Texto CadenaSeparada [0]; textBox2.Text CadenaSeparada = [1]; } Tambien le he probado con oAutor cboAutores.SelectedItem.ToString = () y tampoco me Funciona Las cadenas las Necesito párr Buscar en la Base de Datos los Artículos Escritos Cada autor de, Que Figuren en Ella. El ComboBox sí Llena Perfectamente con cadenas con la Siguiente Estructura Apellido1 Apellido2, Nombre Apellido1 Apellido2, Nombre Apellido1 Apellido2, Nombre .................. .................... (Apellido1 Apellido2, hijo Un solo campo) Selecciono sin artículo, y en el Texto del combo aparece la Cadena Seleccionada con La Misma Estructura, osea, Apellido1 Apellido2, Nombre, y es here Donde Comienzan los Problemas, Pues when Hago oAutor = cboAutotes.Text.ToString; ó oAutor = cboAutotes; me devuelve "ComboBoxWPF_LINQ_01.usp_ListadoCompletoAutoresResult", en Lugar De devolverme la cadena "Apellido1 Apellido2, Nombre", Nada Parecido con la Realidad.
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Creo que necesitas hacer referencia al dataset que llena el combobox, no al valor de texto del mismo
Por cierto, intenta poner tus preguntas en ingles en este sitio, por que muy pocas personas podrán contestarte en español (no es imposible, pero no es lo mas recomendable).
I think you need to get the dataset value in the ComboBox, not the text in the CB itself.
BTW, try posting your questions in english, because too few people will answer your question in spanish.
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Gracias por tu interés. El problema es que yo de inglés no se nada.
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Dado que el sitio es de uso internacional, y al parecer la mayoria de los usuarios son de USA y UK, esta en tu mejor interes escribir en Ingles, esto tambien te ayudara a mejorar como programador ya que tendras acceso a mas material de aprendizaje.
Lo que va a pasar si no haces esto, es que recibiras tantos votos negativos que sera dificil que recibas respuestas. Si buscas recursos en espanol, te recomendaria la pagina de El Guille, aunque no se si siga activa y actualizada.
http://www.elguille.info/[^]
--------------------------------------------------
Since the site is of international use, and it seems the majority of users are from USA and UK, it is in your best interest to write in English, this will also help you improve as a programmer since you will have access to more learning materials.
What will happen if you don't do this, is that you will get so many downvotes that it will be difficult for you to get answers. If you are looking for resources in spanish, I would recommend you El Guille's site, although I don't know if its still active and updated.
http://www.elguille.info/[^]
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Sabrías explicarme como hago lo que me dices. Gracias
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Sorry about the heading, but I really couldnt resist. The question is realted to arcitecture of the implementation of ViewModels in WPF, and its based on the application a wrote an article about here[^], and the code that Im wondering about changing to, hopefully, something better is this:
I have a MainViewModel class where I initiate a Property of ObservableCollections, that contains elements of this class:
Public Class RadioButtonProperies
Private _Text As String
Public Property Text() As String
Get
Return _Text
End Get
Set(ByVal value As String)
_Text = value
End Set
End Property
Private _Index As Integer
Public Property Index() As Integer
Get
Return _Index
End Get
Set(ByVal value As Integer)
_Index = value
End Set
End Property
Private _IsChecked As Boolean = False
Public Property IsChecked() As Boolean
Get
Return _IsChecked
End Get
Set(ByVal value As Boolean)
_IsChecked = value
If value Then
SelectionIndexChanged(Index)
End If
End Set
End Property
Public Event SelectionIndexUpdated(ByVal index As Integer)
Private Sub SelectionIndexChanged(ByVal index As Integer)
RaiseEvent SelectionIndexUpdated(index)
End Sub
End Class
As you can see, I Raise an event when the IsChecked property is set to true, and this event is also raised and passed on from the MAinViewModel class, so I can react if you changed the RadioButton selection on the MainWindow:
Private _Intersections As MainViewModel
Public Sub New()
InitializeComponent()
_Intersections = DirectCast(rbtn.DataContext, MainViewModel)
AddHandler _Intersections.SelectionIndexUpdated, AddressOf rbtnSelectionChanged
End Sub
Public Sub rbtnSelectionChanged(ByVal Value As Integer)
DrawingControl.DrawingCanvas.CanvasEvent = Value
End Sub
My question is this: theres got to be a more effective way of doing this, as my implementation is really cumbersome, and the more I look at it the more ridiculose it seems, and the more i dislike it.
What are the guidelines for implementing functionallity like this? Are there any other ways whitch is easyer or better? Any thoughts?
Regards
Kenneth
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class c#:
using System.Collections.ObjectModel;
namespace WpfApplication3
{
bindingListBoxTOstring.xaml
public partial class bindingListBoxTOstring : Window
{
ObservableCollection<ListBoxData> _ListBoxCollection =
new ObservableCollection<ListBoxData>();
public bindingListBoxTOstring()
{
InitializeComponent();
_ListBoxCollection.Add(new ListBoxData
{ Profilo = "netgear" });
_ListBoxCollection.Add(new ListBoxData
{ Profilo = "alice13" });
}
public ObservableCollection<ListBoxData> ListBoxCollection
{ get { return _ListBoxCollection; } }
public class ListBoxData
{
public string Profilo { get; set; }
}
}
}
in XAML which property should I use to make binding??
XAML code:
<Window x:Class="WpfApplication3.bindingListBoxTOstring"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="bindingListBoxTOstring" Height="300" Width="300">
<Grid>
<ListBox Height="100" HorizontalAlignment="Left"
Margin="108,67,0,0" Name="listBox1"
VerticalAlignment="Top" Width="120" />
</Grid>
</Window>
WPF, binding, ListBox
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In your ListBox, you need to set the ItemsSource to your ListBoxCollection. To do this, you would add ItemsSource="{Binding ListBoxCollection}" in the ListBox. You also need to set the DataSource - as you are just learning, I would suggest keeping it simple and put DataContext = this; immediately after the call to InitializeComponent();.
Finally, you need to actually display something in your ListBox - if you run the application as it stands, you won't see the underlying data because WPF has no way to tell that it should be displaying Profilo. What you want to do is add an ItemTemplate to your ListBox (I'll leave that to you to look up). So, your XAML will look like this:
<ListBox ItemsSource="{Binding ListBoxCollection}" ... put in your other settings here>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Profilo}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
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ok!! it works! 
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before taking this way, I would add items to the listbox like this:
void InserisciItemInListBox(string s, ListBox lb)
{
ListBoxItem lbi = new ListBoxItem();
lbi.Content = s;
lb.Items.Add(lbi);
}
after that, I check which item was selected
private void ListBoxSelectedPrintText(object sender, SelectionChangedEventArgs e)
{
ListBoxItem item = ((ListBox)sender).SelectedItem as ListBoxItem;
String itemText = (item != null) ? item.Content.ToString() : String.Empty;
tb.Text = " You selected " + itemText; ;
}
i've updated XAML
<ListBox ItemsSource="{Binding ProfiliCollection}"
Width="100" SelectionChanged="ListBoxSelectedPrintText"
...
now I can not extract the text of the item selected, how do I fix it?
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hello
I added a scrollbar, but it does not work
help me please
<ListView ItemsSource="{Binding GameCollection}" ScrollViewer.VerticalScrollBarVisibility="Visible">
here is the immgine of my problem
linkToSnap
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Hello, I have a DataGrid that I am using where the user clicks a button to add information to the DataGrid. I would like to set focus to the first cell when the user clicks the button. My previous code worked great in a plain ol' DataGridTextColumn, but no longer works.
Here is my XAML:
<DataGrid.Columns>
<DataGridTemplateColumn x:Name="partName"
Header="Part Name"
CanUserResize="True"
Width="225"
MinWidth="225">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock VerticalAlignment="Center" Focusable="True" FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}">
<Hyperlink NavigateUri="http://www.bing.com"
RequestNavigate="Hyperlink_RequestNavigate"
TextDecorations="None">
<TextBlock Text="{Binding Path=description}" x:Name="hyperLinkTextBlock"
FontSize="20"
FontWeight="Black"
TextWrapping="WrapWithOverflow"
TextDecorations="Underline"
Focusable="True"
FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}"/>
</Hyperlink>
</TextBlock>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<TextBox FontSize="20"
FontWeight="Black"
HorizontalAlignment="Stretch"
VerticalContentAlignment="Center"/>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
And here is my C# code:
partsDataGrid.Focus();
partsDataGrid.UpdateLayout();
DataGridCellInfo cellInfo = new DataGridCellInfo (partsDataGrid.Items[0], partsDataGrid.Columns[0]);
partsDataGrid.CurrentCell = cellInfo;
partsDataGrid.BeginEdit();
What am I doing wrong? Thanks in advance!
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Just for anyone else, I discovered my problem. Even though I had set everything inside my DataGridTemplateColumn to focusable, I hadn't set focusable to true inside my CellStyle.
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I have a custom user control that inherits FrameWorkElement and draws some custom shapes on a canvas. I added this code to get the context menus for the item:
Sub New()
......
Dim contextmenu As New ContextMenu()
Dim mi As New MenuItem()
Dim mia As New MenuItem()
mi.Header = ("Item 1")
contextmenu.Items.Add(mi)
mia.Header = ("Item 2")
contextmenu.Items.Add(mia)
AddHandler contextmenu.MouseLeave, AddressOf CloseContextmenu
Me.ContextMenu = (contextmenu)
End Sub
Private Sub CloseContextmenu(ByVal sender As Object, ByVal e As Input.MouseEventArgs)
Me.ContextMenu.IsOpen = False
End Sub
Which does close the contextmenu, but not when you leave the menu, only when you click outside the contextmenu. My question is has anybody managed to close the contextmenu on mouse leave?
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Ok, I nearly sovled this myself, though its not the ideal solution:
If Mouse.RightButton = MouseButtonState.Pressed Then
If TypeOf (selectedElement) Is CustomElement Then
Dim ga As CustomLine = DirectCast(selectedElement, CustomElement)
Dim contextmenu As New ContextMenu()
Dim bord As New StackPanel
Dim mi As New MenuItem()
Dim mia As New MenuItem()
mi.Header = ("Item 1")
mia.Header = ("Item 2")
bord.Children.Add(mi)
bord.Children.Add(mia)
AddHandler bord.MouseLeave, AddressOf menuitem1_leave
contextmenu.Items.Add(bord)
contextmenu.IsOpen = True
ga.ContextMenu = (contextmenu)
End If
End If
with the mouse leave sub:
Private Sub menuitem1_leave(ByVal sender As Object, ByVal e As Input.MouseEventArgs)
Dim dep As DependencyObject = DirectCast(e.OriginalSource, DependencyObject)
While (dep IsNot Nothing) AndAlso Not (TypeOf dep Is ContextMenu)
dep = VisualTreeHelper.GetParent(dep)
End While
If dep Is Nothing Then
Exit Sub
End If
DirectCast(dep, ContextMenu).IsOpen = False
End Sub
Problem is that the items are messed up inside the ContextMenu, so it looks wierd. So the next question is does anybod have any ideas on how to do this properly?
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When I set AutoGenerateColumns = false, then I see no data. I see the data when AutoGenerateColumns = True. Here's my grid:
<DataGrid Grid.Row="1"
Grid.Column="0"
Grid.ColumnSpan="2"
Margin="5"
ItemsSource="{Binding AccountItems}"
SelectedItem="{Binding SelectedAccountItem}"
AutoGenerateColumns="True">
<DataGrid.Columns>
<DataGridTemplateColumn Header="Date"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding DisplayDate}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Memo 1"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Memo1}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Memo 2"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Memo2}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Debit"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Debit}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Credit"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Credit}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Balance"
Width="SizeToCells"
IsReadOnly="True">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Image Source="{Binding Balance}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
What am I doing wrong here?
Thanks
If it's not broken, fix it until it is
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Not exactly sure but the http://msdn.microsoft.com/en-us/library/system.windows.controls.datagrid.autogeneratecolumns.aspx[^] seems to give an answer:
<DataGrid Name="DG1" ItemsSource="{Binding}" AutoGenerateColumns="True" AutoGeneratingColumn="DG1_AutoGeneratingColumn" />
and in the code behind:
private void DG1_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
string headername = e.Column.Header.ToString();
if (headername == "MiddleName")
{
e.Cancel = true;
}
if (headername == "FirstName")
{
e.Column.Header = "First Name";
}
else if (headername == "LastName")
{
e.Column.Header = "Last Name";
}
else if (headername == "EmailAddress")
{
e.Column.Header = "Email";
}
}
You could use the code and step through the code with the debugger, at least then you could see whats going on.
modified 20-Sep-12 18:10pm.
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Kenneth Haugland wrote: Windows Forms Designer
He's talking about WPF, not Windows Forms, and he's put what looks like well formed templates in there.
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Dang it... 
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Hard to say from that - we only have half the picture here. Tell you what, what do you see if you change the DataGridTemplateColumns into DataGridTextColumns? What appears in the text? Is the source correct then?
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That did it. Thanks Pete
If it's not broken, fix it until it is
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