I am new to WPF and also the MVVM pattern, I tried to create a simple WPF project to query a database of I-Shape Steel Profiles and show it to the user through the DataGrid. After I have successfully done it, I am now moving to the next part: Letting the user to add new steel profiles to the DataGrid by filling out a set of TextBoxes.
Model
namespace SectionGuardWPF.MVVM.Model
{
public class IProfileModel : ObservableObject
{
#region Private Fields
public short _recno;
public string _name;
public string _staadName;
public double _ax;
public double _d;
public double _bf;
public double _tf;
public double _tw;
public double _iz;
public double _ix;
public double _ct;
public double _iy;
public double _zx;
public double _zy;
#endregion
#region Public Properties
/// <summary>
/// Properties are given NotifyPropertyChanged method to allow for a change in property to be notified
/// </summary>
public short RECNO
{
get { return _recno; }
set
{
_recno = value;
OnPropertyChanged();
}
}
public string Name
{
get { return _name; }
set
{
_name = value;
OnPropertyChanged();
}
}
...
// Repeated for the other fields
ObservableObject: Base class that implements INotifyPropertyChanged
namespace SectionGuardWPF.Core
{
public class ObservableObject : INotifyPropertyChanged
{
/// <summary>
/// Raised when a property on this object has a new value.
/// </summary>
public event PropertyChangedEventHandler PropertyChanged;
/// <summary>
/// Raises this object's PropertyChanged event.
/// </summary>
protected void OnPropertyChanged([CallerMemberName] string name = null) // If you use the CallerMemberName attribute, calls to the NotifyPropertyChanged method don't have to specify the property name as a string argument
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
}
}
}
RelayCommand
namespace SectionGuardWPF.Core
{
class RelayCommand : ICommand
{
private Action<object> _execute;
private Func<object, bool> _canExecute;
public event EventHandler CanExecuteChanged
{
add { CommandManager.RequerySuggested += value; }
remove { CommandManager.RequerySuggested -= value; }
}
public RelayCommand(Action<object> execute, Func<object,bool> canExecute=null)
{
_execute = execute;
_canExecute = canExecute;
}
public bool CanExecute(object parameter)
{
return _canExecute == null || _canExecute(parameter);
}
public void Execute(object parameter)
{
_execute(parameter);
}
}
}
View Model
namespace SectionGuardWPF.MVVM.ViewModel
{
public class IProfilesViewModel:ObservableObject
{
#region Private Fields
private readonly string _connectionString = //Hidden
private ObservableCollection<IProfileModel> _iProfiles;
private ICommand _getIProfilesCommand;
private ICommand _addNewIProfileCommand;
private IProfileModel _iProfile = new IProfileModel();
#endregion
#region Constructor
public IProfilesViewModel()
{
// Set default Profile Database for the DataGrid upon View instantiation
IProfiles = GetIProfiles();
}
#endregion
#region Public Properties and Commands
/// <summary>
/// Public properties of the IProfilesViewModel Class (used for view binding with IProfilesSubView)
/// </summary>
public ObservableCollection<IProfileModel> IProfiles
{
get { return _iProfiles; }
set
{
_iProfiles = value;
OnPropertyChanged();
}
}
public IProfileModel IProfile
{
get { return _iProfile; }
set
{
_iProfile = value;
OnPropertyChanged();
}
}
public ICommand GetIProfilesCommand
{
get
{
if (_getIProfilesCommand == null)
{
_getIProfilesCommand = new RelayCommand(
param => GetIProfiles()
);
}
return _getIProfilesCommand;
}
}
public ICommand AddNewIProfileCommand
{
get
{
if (_addNewIProfileCommand == null)
{
_addNewIProfileCommand = new RelayCommand(
param => AddNewIProfile()
);
}
return _addNewIProfileCommand;
}
}
#endregion
#region Private Methods
private ObservableCollection<IProfileModel> GetIProfiles()
{
TableDataProvider tableDataProvider = new TableDataProvider(_connectionString);
tableDataProvider.QueryString = "SELECT * FROM [I Shape]";
IEnumerable<IProfileModel> iProfiles = tableDataProvider.Query<IProfileModel>();
ObservableCollection<IProfileModel> iProfileObsvCol = new ObservableCollection<IProfileModel>(iProfiles);
return iProfileObsvCol;
}
private void AddNewIProfile()
{
IProfiles.Add(
new IProfileModel
{
RECNO = IProfile.RECNO,
Name = IProfile.Name,
StaadName = IProfile.StaadName,
AX = IProfile.AX,
D = IProfile.D,
Bf = IProfile.Bf,
Tf = IProfile.Tf,
Tw = IProfile.Tw,
Ix = IProfile.Ix,
Iy = IProfile.Iy,
Iz = IProfile.Iz,
Ct = IProfile.Ct,
Zx = IProfile.Zx,
Zy = IProfile.Zy
}
);
}
#endregion
}
}
View
<UserControl x:Class="SectionGuardWPF.MVVM.View.IProfilesSubView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:SectionGuardWPF.MVVM.View"
xmlns:viewModel= "clr-namespace:SectionGuardWPF.MVVM.ViewModel"
xmlns:view="clr-namespace:SectionGuardWPF.MVVM.View"
mc:Ignorable="d"
d:DesignHeight="580" d:DesignWidth="1300">
<UserControl.DataContext>
<viewModel:IProfilesViewModel/>
</UserControl.DataContext>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="620"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<DataGrid x:Name="ProfilesDataGrid"
x:FieldModifier="public"
ItemsSource="{Binding IProfiles, Mode=TwoWay}">
</DataGrid>
<Border Grid.Column="1"
CornerRadius="20"
Background ="White"
Margin="10">
<Grid Margin="10">
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
<RowDefinition/>
<RowDefinition Height="150"/>
</Grid.RowDefinitions>
<TextBlock Text="I-Profiles Data Viewer"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="Black"
FontSize="22"/>
<Grid Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<TextBlock Text="RECNO"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="0"
Grid.Row="0"
FontSize="14"/>
<TextBox x:Name="RECNOTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="0"
Grid.Row="0"
Text="{Binding IProfile.RECNO, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Name"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="0"
Grid.Row="1"
FontSize="14"/>
<TextBox x:Name="NameTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="0"
Grid.Row="1"
Text="{Binding IProfile.Name, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="StaadName"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="0"
Grid.Row="2"
FontSize="14"/>
<TextBox x:Name="StaadNameTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="0"
Grid.Row="2"
Text="{Binding IProfile.StaadName, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="AX"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="0"
Grid.Row="3"
FontSize="18"/>
<TextBox x:Name="AXTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="0"
Grid.Row="3"
Text="{Binding IProfile.AX, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="D"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="0"
Grid.Row="4"
FontSize="18"/>
<TextBox x:Name="DTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="0"
Grid.Row="4"
Text="{Binding IProfile.D, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Bf"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="0"
Grid.Row="5"
FontSize="18"/>
<TextBox x:Name="BfTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="0"
Grid.Row="5"
Text="{Binding IProfile.Bf, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Tf"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="0"
Grid.Row="6"
FontSize="18"/>
<TextBox x:Name="TfTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="0"
Grid.Row="6"
Text="{Binding IProfile.Tf, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Tw"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="1"
Grid.Row="0"
FontSize="18"/>
<TextBox x:Name="TwTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="1"
Grid.Row="0"
Text="{Binding IProfile.Tw, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Ix"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="1"
Grid.Row="1"
FontSize="18"/>
<TextBox x:Name="IxTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="1"
Grid.Row="1"
Text="{Binding IProfile.Ix, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Iy"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="1"
Grid.Row="2"
FontSize="18"/>
<TextBox x:Name="IyTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="1"
Grid.Row="2"
Text="{Binding IProfile.Iy, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Iz"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="1"
Grid.Row="3"
FontSize="18"/>
<TextBox x:Name="IzTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="1"
Grid.Row="3"
Text="{Binding IProfile.Iz, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Ct"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="1"
Grid.Row="4"
FontSize="18"/>
<TextBox x:Name="CtTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="1"
Grid.Row="4"
Text="{Binding IProfile.Ct, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Zx"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="1"
Grid.Row="5"
FontSize="18"/>
<TextBox x:Name="ZxTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="1"
Grid.Row="5"
Text="{Binding IProfile.Zx, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<TextBlock Text="Zy"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="20,0,0,0"
Foreground="#1A80FA"
Grid.Column="1"
Grid.Row="6"
FontSize="18"/>
<TextBox x:Name="ZyTextBox"
Margin="0,0,20,0"
VerticalAlignment="Center"
HorizontalAlignment="Right"
Style="{StaticResource ParameterTextbox}"
Grid.Column="1"
Grid.Row="6"
Text="{Binding IProfile.Zy, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
</Grid>
<StackPanel Grid.Row="2"
Orientation="Horizontal">
<Button x:Name="AddButton"
Style="{StaticResource AddButton}"
Content="Add"
Background="#28C941"
Height="50"
Width="150"
Margin="85,0,0,0"
Command="{Binding AddNewIProfileCommand}"/>
<Button x:Name="EditButton"
Style="{StaticResource AddButton}"
Content="Edit"
Background="#FFBD2E"
Height="50"
Width="150"
Margin="20,0,0,0"/>
<Button x:Name="DeleteButton"
Style="{StaticResource AddButton}"
Content="Delete"
Background="#FF6059"
Height="50"
Width="150"
Margin="20,0,0,0"/>
</StackPanel>
</Grid>
</Border>
</Grid>
</UserControl>
My Model class is a class called the IProfileModel that represents the I-Shape Profiles, I have made so that it inherits from the ObservableObject class so that it can use the NotifyPropertyChanged methods and I have made so that the properties of the Model class has implemented the OnPropertyChanged() Method.
In my View, I have bound the source of the DataGrid to the IProfiles which is an ObservableCollection that stores instances of the IProfileModel. Each TextBox corresponds to one property of the IProfileModel class, thus the Text property of each TextBox is bound to its respective nested property of the IProfile property of the ViewModel. The "Add" Button is bound to the respective ICommand in the ViewModel called the AddNewIProfileCommand
In my ViewModel, I have added the IProfileModel as one of its properties using the name IProfile, the TextBox.Text properties are bound to the nested properties of the IProfile as shown in the XAML of the View. As for the AddNewIProfileCommand, I have made so that it corresponds to a private method called the AddNewIProfile() which will add a new IProfileModel object whose properties will refer to the nested properties of the IProfile property that is bound to the TextBoxes.
Edit:
I want to add that the AddNewIProfile() will add the new IProfileModel object to the IProfiles which is bound to the DataGrid
My main issue is that whenever I modified the TextBoxes and then clicked on the Button to add the profiles to the DataGrid, the newly added entry to the DataGrid is always a IProfileModel with empty property values (all string properties of the IProfileModel are null and all numerical type properties are 0). It seems like modifying the TextBoxes does not change the nested properties of the IProfile even though I have set the UpdateSourceTrigger to PropertyChanged and the Mode to Two Way and the IProfile itself is of the IProfileModel class which has inherited from the ObservableObject class.
Lastly, I know that my question is quite similar to this one but I have followed the suggestions there and tried to match their solution but I somehow can't get it to work.
Thanks!
Edit:
Added some before - after picture of the DataGrid after the "Add" Button is pressed:
Edit:
The ParameterTextbox Style which was the cause of the error as pointed out by Cédric Moers in the comments:
<Style TargetType="{x:Type TextBox}"
x:Key="ParameterTextbox">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<Border CornerRadius="5"
Background="White"
Width="180"
Height="35"
BorderThickness="3"
BorderBrush="#EAEAEA">
<Grid>
<Rectangle StrokeThickness="1"/>
<TextBox Margin="1"
Text="{TemplateBinding Text}"
BorderThickness="0"
Background="Transparent"
VerticalContentAlignment="Center"
Padding="5"
Foreground="Black"
x:Name="SearchBox"/>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
I tried to replicate your problem but I had to remove the styles since you did not provide them. It works at my side, so perhaps the problem lies within the style?
Please delete your styles for the textboxes (ParameterTextbox) and see if it works then. If you can provide me with the source code for the style, I can take a look at it. Maybe you are overriding the text property.
edit after it turned out the style was the issue
here is an example of the style you want to accomplish in a minimalistic way.
<UserControl.Resources>
<ControlTemplate x:Key="RoundedTextBoxCt">
<Border
Width="{TemplateBinding Width}"
Height="{TemplateBinding Height}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}"
x:Name="Bd"
CornerRadius="5">
<ScrollViewer
Padding="{TemplateBinding Padding}"
VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
Foreground="{TemplateBinding Foreground}"
x:Name="PART_ContentHost"/>
</Border>
</ControlTemplate>
<Style x:Key="ParameterTextBox" TargetType="TextBox">
<Setter Property="Width" Value="180"/>
<Setter Property="Height" Value="35"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="Padding" Value="5"/>
<Setter Property="Foreground" Value="Black"/>
<Setter Property="BorderBrush" Value="#EAEAEA"/>
<Setter Property="BorderThickness" Value="3"/>
<Setter Property="Background" Value="White"/>
<Setter Property="Template" Value="{StaticResource RoundedTextBoxCt}"/>
</Style>
...
</UserControl.Resources>
I made the control template as a separate resource, this way 'rounded textbox' can be put inside of some 'shared' assembly, and you will be able to use it for other projects as well.
It is minimalistic, as in the minimal you'll need. If you want a full-fledged text box, copy the style from here and modify it: https://learn.microsoft.com/en-us/dotnet/desktop/wpf/controls/textbox-styles-and-templates?view=netframeworkdesktop-4.8
it might look scary, but most of the time it comes down to modifying only a few rules. Once you get the hang of it, it's quite easy.
Instead of working with the setters, and even a separate control template resource, you could hard-code everything within the control template, WITHIN the setter of the control template of the textbox style, but that's up to you.
Good luck!
I Want to change a DependcyProperty(Named is as MessageTemplateProperty) which is in CustomControl and Type is Controltemplate .
But I can't set the value to it using datatrigger
But another DependcyProperty(named as IsShowMessageProperty) which is in CustomControl and Type is bool can be set using datatrigger.
Who can explain it ,Why, and How to solve it.
The Custom Code as follow:
public class MessageOverLay : ContentControl
{
static MessageOverLay()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(MessageOverLay),
new FrameworkPropertyMetadata(typeof(MessageOverLay)));
}
#region DependcyProperties
// Template attached property
public static readonly DependencyProperty MessageTemplateProperty =
DependencyProperty.Register("MessageTemplate", typeof(ControlTemplate), typeof(MessageOverLay),
new FrameworkPropertyMetadata(MessageTemplateChanged));
public ControlTemplate MessageTemplate
{
set{SetValue(MessageTemplateProperty, value);}
get{return (ControlTemplate)GetValue(MessageTemplateProperty);}
}
// IsVisible attached property
public static readonly DependencyProperty IsShowMessageProperty =
DependencyProperty.Register("IsShowMessage", typeof(bool), typeof(MessageOverLay),
new PropertyMetadata(IsShowMessageChanged));
public bool IsShowMessage
{
get{return (bool)GetValue(IsShowMessageProperty);}
set{SetValue(IsShowMessageProperty, value);}
}
#endregion DependcyProperties
}
The Custom Default Theme Generic.xaml
<Style TargetType="{x:Type controls:MessageOverLay}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="controls:MessageOverLay">
<AdornerDecorator>
<Grid>
<ContentPresenter x:Name="PART_Conent"
VerticalAlignment="Stretch"
HorizontalAlignment="Stretch"
Content="{TemplateBinding Content}" />
<Control x:Name="Part_MessageControl" Template="{TemplateBinding MessageTemplate}"
Visibility="{TemplateBinding IsShowMessage,Converter={StaticResource BooleanToVisibilityConverter}}" />
</Grid>
</AdornerDecorator>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="MessageTemplate">
<Setter.Value>
<ControlTemplate>
<Grid HorizontalAlignment="Left" VerticalAlignment="Bottom">
<Grid Width="150" Height="100" Margin="5 0 0 10">
<Rectangle Stroke="Black" Fill="Yellow" RadiusX="6" RadiusY="6" Margin="0 20 0 0" />
<TextBlock Text="What are you doing?" Margin="5 25 0 0" />
<Button Content="Cancel" Margin="5" VerticalAlignment="Bottom" HorizontalAlignment="Right" />
<Button Content="OK" Margin="5" VerticalAlignment="Bottom" HorizontalAlignment="Left" />
</Grid>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
I Want to use it as follow:
Demo XAML:
<Window ...>
<Window.Resources>
<ControlTemplate x:Key="GenderPopupTemplate">
<Grid HorizontalAlignment="Left" VerticalAlignment="Bottom">
<Grid Width="200" Height="100" Margin=" 5 0 0 10">
<TextBlock Text="Please Select Gender " Margin="5 25 0 0" />
<Button Content="Male" Margin="5" VerticalAlignment="Bottom" HorizontalAlignment="Left"
Command="{Binding SelectedGenderCommand}" />
<Button Content="FeMale" Margin="5" VerticalAlignment="Bottom" HorizontalAlignment="Right"
Command="{Binding SelectedGenderCommand}" />
</Grid>
</Grid>
</ControlTemplate>
<ControlTemplate x:Key="FacePopupTemplate">
<Grid HorizontalAlignment="Left" VerticalAlignment="Bottom">
<Grid Width="200" Height="100" Margin="5 10 0 0">
<TextBlock Text="Do you like your Face,Now?" Margin="5 25 0 0" />
<Button Content="OK" Margin="5" VerticalAlignment="Bottom" HorizontalAlignment="Left"
Command="{Binding OKCommand}" />
</Grid>
</Grid>
</ControlTemplate>
</Window.Resources>
<controls:MessageOverLay HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
MessageTemplate="{StaticResource GenderPopupTemplate}"
IsShowMessage="True">
<controls:MessageOverLay.Style>
<Style TargetType="{x:Type controls:MessageOverLay}">
<Style.Triggers>
<DataTrigger Binding="{Binding MessageBoxType}" Value="{x:Static viewModels:MessageBoxTypes.SelectView}">
<Setter Property="MessageTemplate" Value="{StaticResource GenderPopupTemplate}"></Setter>
<Setter Property="Height" Value="350"/>
</DataTrigger>
<DataTrigger Binding="{Binding MessageBoxType}" Value="{x:Static viewModels:MessageBoxTypes.MessageView}">
<Setter Property="MessageTemplate" Value="{StaticResource FacePopupTemplate}"></Setter>
<Setter Property="Height" Value="150"/>
</DataTrigger>
</Style.Triggers>
</Style>
</controls:MessageOverLay.Style>
<Grid Background="SeaGreen"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch">
<TextBlock Text="Content"/>
</Grid>
</controls:MessageOverLay>
I want to change the MessageTemplate when the Propery MessageBoxType of MainWindowViewModel changed.
But I can't archive it.
The other related code
Demo C# Code:
public class MainWindowViewModel : BindableBase
{
public ICommand SelectedGenderCommand { get; }
public ICommand OKCommand { get; }
private MessageBoxTypes _messageBoxType;
public MessageBoxTypes MessageBoxType
{
get { return _messageBoxType; }
set { SetProperty(ref _messageBoxType, value); }
}
private string _title = "Prism Unity Application";
public string Title
{
get { return _title; }
set { SetProperty(ref _title, value); }
}
public MainWindowViewModel()
{
MessageBoxType = MessageBoxTypes.SelectView;
SelectedGenderCommand = new DelegateCommand<object>(SelectedGender);
OKCommand = new DelegateCommand<object>(OK);
}
private void OK(object obj)
{
MessageBoxType = MessageBoxTypes.SelectView;
}
private void SelectedGender(object obj)
{
MessageBoxType = MessageBoxTypes.MessageView;
}
}
public enum MessageBoxTypes
{
SelectView,
MessageView,
ConfirmView
}
Update:
Here is the full demo code in github ,Please check it.
When a dependency property is to be set by a Style Setter, there must be no direct assignment of a so-called local value, as you do in
<controls:MessageOverLay MessageTemplate="{StaticResource GenderPopupTemplate}" ...>
The directly assigned local value always has higher precedence than any value from Style Setters (and other possible sources), so that the Setter has no effect. More details can be found here: Dependency Property Value Precedence.
Replace the direct assignment be another Style Setter:
<controls:MessageOverLay ...>
<controls:MessageOverLay.Style>
<Style TargetType="{x:Type controls:MessageOverLay}">
<Setter Property="MessageTemplate"
Value="{StaticResource GenderPopupTemplate}"/>
<Style.Triggers>
...
</Style.Triggers>
</Style>
</controls:MessageOverLay.Style>
...
</controls:MessageOverLay>
I am developing windows phone 8.1 app and I need circular progressbar.
I have this usercontrol code:
<UserControl.Resources>
<Style TargetType="ProgressBar" x:Key="CircularProgressBarStyle">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ProgressBar">
<Grid x:Name="LayoutRoot">
<local:CircularProgressBarViewModel.Attach>
<local:CircularProgressBarViewModel HoleSizeFactor="0.75"/>
</local:CircularProgressBarViewModel.Attach>
<Ellipse Width="{Binding Diameter}" Height="{Binding Diameter}"
HorizontalAlignment="Center" VerticalAlignment="Center"
Stroke="LightGray" Opacity="0.5" Fill="Transparent"
StrokeThickness="10">
</Ellipse>
<local:PiePiece CentreX="{Binding CentreX}" CentreY="{Binding CentreY}"
RotationAngle="0" WedgeAngle="{Binding Angle}"
Radius="{Binding Radius}" InnerRadius="{Binding InnerRadius}"
Fill="Black" Opacity="0.7"/>
<Grid util:GridUtils.RowDefinitions="*,2*,*"
util:GridUtils.ColumnDefinitions="*,2*,*">
<Viewbox Grid.Row="1" Grid.Column="1">
<TextBlock Name="myValue" Text="{myValue value}"
Foreground="WhiteSmoke"
FontWeight="Bold"
VerticalAlignment="Center" HorizontalAlignment="Center"/>
</Viewbox>
</Grid></Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
How can I change value with the name "myValue" from code behind (for example, from MainPage.xaml.cs) and not from CircularProgressBarViewModel?
If you need to get myValue from your MainPage, where you are using your UserControl you can create DependencyProperty in your control and set any value from page to control.
public sealed partial class YourUserControl: UserControl
{
public static readonly DependencyProperty myValueProperty = DependencyProperty.Register("myValue", typeof(string), typeof(YourUserControl), new PropertyMetadata(string.Empty));
public YourUserControl()
{
this.InitializeComponent();
}
public string myValue
{
get { return (string)GetValue(myValueProperty ); }
set { SetValue(myValueProperty , value); }
}
}
And on the your MainPage like this:
<controls:YourUserControl myValue={Binding YourValue}/>
I am new in working with wpf and currently I am trying to do the following: I have created a simple ContenctControl (CtrpushPinContent) that contains a TextBlock:
<ContentControl x:Class="CtrpushPinContent" ...
<Grid x:Name="LayoutRoot" Background="{x:Null}">
<Border BorderThickness="3" Name="border1" CornerRadius="15" BorderBrush="#FF070707" Margin="0,0,0,0">
<Border BorderBrush="Silver" BorderThickness="3" Name="border2" CornerRadius="15" Background="#FF413E3E">
<TextBlock Name="textBlock1" TextAlignment="Center" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="4" Foreground="White" />
</Border>
</Border>
</Grid>
</ContentControl>
The cs file looks like this:
public partial class CtrpushPinContent : ContentControl
{
public static readonly DependencyProperty CaptionProperty =
DependencyProperty.Register("Text",
typeof(string),
typeof(CtrpushPinContent),
new PropertyMetadata(string.Empty));
public string Text
{
get { return textBlock1.Text; }
set { textBlock1.Text = value; }
}
public CtrpushPinContent()
{
InitializeComponent();
}
}
On the main PhoneApplicationPage I try to do the following:
<phone:PhoneApplicationPage.Resources>
<Style TargetType="my:Pushpin" x:Key="PushpinStyle">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="my:Pushpin">
<Grid x:Name="ContentGrid">
<StackPanel Orientation="Vertical">
<Grid Background="{x:Null}" HorizontalAlignment="Right" MinHeight="31" MinWidth="29">
<LJTileSources:CtrpushPinContent HorizontalAlignment="Right" Text="{TemplateBinding Content}" Margin="4" ContentTemplate="{TemplateBinding ContentTemplate}" />
</Grid>
<Image Source="/WifiHotSpot;component/Images/blackPinNoShadow.png" Width="54" Height="54" HorizontalAlignment="Center"></Image>
</StackPanel>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</phone:PhoneApplicationPage.Resources>
<Grid>
<my:Map Margin="0,1,0,0" Name="map1" LogoVisibility="Collapsed" Height="576" CredentialsProvider="key" ZoomLevel="2">
<my:Pushpin Style="{StaticResource PushpinStyle}" Content="Test" Location="50.0863762,14.42814" PositionOrigin="BottomLeft"></my:Pushpin>
</my:Map>
</Grid>
However my solution is not working. I cannot see any effect of the
<my:Pushpin Style="{StaticResource PushpinStyle}" Content="Test" .../>
I believe the problem is somewhere in the style declaration:
<LJTileSources:CtrpushPinContent HorizontalAlignment="Right" Text="{TemplateBinding Content}" Margin="4" ContentTemplate="{TemplateBinding ContentTemplate}" />
because when I change it to
<LJTileSources:CtrpushPinContent HorizontalAlignment="Right" Text="TestText" Margin="4" ContentTemplate="{TemplateBinding ContentTemplate}" />
it displays the "TestText" as required.
In your case for solve this problem quickly you need to implement this:
public static readonly DependencyProperty CaptionProperty =
DependencyProperty.Register("Text",
typeof(string),
typeof(CtrpushPinContent),
new PropertyMetadata(string.Empty, OnTextChanged));
public string Text
{
get { return textBlock1.Text; }
set { textBlock1.Text = value; }
}
private static void OnTextChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
((CtrpushPinContent)sender).textBlock1.Text = (string)e.NewValue;
}
public CtrpushPinContent()
{
InitializeComponent();
}
When you set text in Pushpin template:
<LJTileSources:CtrpushPinContent HorizontalAlignment="Right" Text="{TemplateBinding Content}"
Margin="4" ContentTemplate="{TemplateBinding ContentTemplate}" />
you don't set Text property in your control, you set value of dependency property CaptionProperty, because you registered it with name "Text". So when you set Text from xaml, you set exactly Caption property, not Text property of your control. So you need to create event of changing this dependency property for updating text in textBox1.