I want to add items of my class treeviewitem to a TreeView.
And I want to bind the ItemSource of this TreeViewItem to a method of itself !
I am trying to use the ObjectDataProvider for this.. See my XAML:
<Grid Background="#FFE5E5E5">
<Grid.Resources>
<HierarchicalDataTemplate DataType="{x:Type myNs:treeviewitem}">
<HierarchicalDataTemplate.Resources>
<ObjectDataProvider x:Key="getItems"
MethodName="GetItems"
ObjectInstance="{Binding RelativeSource={RelativeSource Self}}" />
</HierarchicalDataTemplate.Resources>
<HierarchicalDataTemplate.ItemsSource>
<Binding Source="{StaticResource getItems}" />
</HierarchicalDataTemplate.ItemsSource>
<StackPanel Orientation="Horizontal">
<TextBlock Margin="5,0,0,0"
Text="{Binding Name}" />
</StackPanel>
</HierarchicalDataTemplate>
</Grid.Resources>
<TreeView x:Name="guiTreeview"
HorizontalAlignment="Left"
Width="200" />
</Grid>
But binding to an ObjectInstance isnt possible!
How is it possible to get the current object instance "into" the ObjectDataProvider?
What would be the right way of doint this?
And NO, its not possible to use a Property ..
I have done it now with a ValueConverter.
XAML:
<Grid Background="#FFE5E5E5">
<Grid.Resources>
<HierarchicalDataTemplate DataType="{x:Type myNs:MyItem}" ItemsSource="{Binding RelativeSource={RelativeSource Self}, Converter={myNs:GetItemsConverter}}" >
<StackPanel Orientation="Horizontal">
<TextBlock Margin="5,0,0,0" Text="{Binding Name}" />
</StackPanel>
</HierarchicalDataTemplate>
</Grid.Resources>
<TreeView x:Name="guiTreeview" HorizontalAlignment="Left" Width="200" />
</Grid>
Converter:
public abstract class BaseConverter : MarkupExtension
{
public override object ProvideValue(IServiceProvider serviceProvider)
{
return this;
}
}
public class GetItemsConverter : BaseConverter, IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var tvi = value as TreeViewItem;
if (tvi == null) return null;
var myitem = tvi.DataContext as MyItem;
if (myitem == null) return null;
return myitem.GetItems();
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return null;
}
}
Related
I have two comboboxes that I would to show besides each other.
I am using a grid, and two columns for this... but when I do this, the initialliy selected item for the comboxbox disappears
so, if I put them in a grid... i get this:
If I remove the grid... the combobox gets the initial value...
the xaml looks like this... here with the grid part commented out... I just don't get why adding/removing the grid makes a difference...
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<StackPanel>
<TextBlock Text="{x:Bind ViewModel.LoadErrorMessage, Mode=OneWay}" />
<!--<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="5*"/>
</Grid.ColumnDefinitions>-->
<ComboBox HorizontalAlignment="Stretch" ItemsSource="{x:Bind ViewModel.WeaponCountRange}" SelectedItem="{x:Bind ViewModel.WeaponCount, Mode=TwoWay}"></ComboBox>
<ComboBox Grid.Column="1" HorizontalAlignment="Stretch" ItemsSource="{x:Bind ViewModel.Weapons}" SelectedItem="{x:Bind ViewModel.SelectedWeapon, Mode=TwoWay}" >
<ComboBox.ItemTemplate>
<DataTemplate>
<Border Background="Black">
<StackPanel Orientation="Horizontal">
<Image Source="{Binding ImageFile}" Stretch="Uniform" Height="48"></Image>
<TextBlock Foreground="Yellow" Height="48" VerticalAlignment="Stretch" Text="{Binding Name}"></TextBlock>
<Image VerticalAlignment="Top" Visibility="{Binding ShieldPiercingVis}" Height="12" Source="/Assets/ship_modules/dragon_missile.png"/>
</StackPanel>
</Border>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
<!--</Grid>-->
<Border>
the code behind that populates, is a async task... see the following
public ObservableCollection<WeaponViewModel> Weapons = new ObservableCollection<WeaponViewModel>();
private WeaponViewModel _selectedWeapon;
public WeaponViewModel SelectedWeapon
{
get => _selectedWeapon;
set => SetProperty(ref _selectedWeapon, value);
}
private async Task Initialize()
{
{
var wRepo = new WeaponRepository();
await wRepo.Initialize();
foreach (var item in wRepo.Weapons)
{
Weapons.Add(new WeaponViewModel(item));
if (Weapons.Count == 1)
SelectedWeapon = Weapons[0];
}
}
...
I could not reproduce your issue. When I run your code, it throw exception. And I found that you have not set IValueConverter for SelectedItem. I have created the converter for SelectedItem and it works well in my side. I will upload the code sample that you could refer to.
Converter
public class Converter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, string language)
{
return value;
}
public object ConvertBack(object value, Type targetType, object parameter, string language)
{
return value as ComboBoxItem;
}
}
I'm in the process of converting a fairly large WPF app from three-layer into MVVM, and in the process learning MVVM. So far, I haven't delved into too much detail around Bindings (etc), so bear with me.
I'm trying to bind the System.Windows.Visibility of multiple controls to a public property ("State") of the ViewModel. When the parent TabItem loads, the State property is read and handled as desired. When subsequent changes to the property are made, however, they appear to be ignored. I've (re-re-re-)checked Bindings, debugged the Converters, etc, and this is driving me crazy.
ViewModel:
public class MarketingListViewModel: IDisposable, INotifyPropertyChanged
{
private UiState state;
public event PropertyChangedEventHandler PropertyChanged;
public UiState State
{
get { return state; }
set
{
if (state != value)
{
state = value;
NotifyPropertyChanged("State");
}
}
}
public MarketingListViewModel()
{
State = UiState.View;
}
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
}
View:
<UserControl 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:diag="clr-namespace:System.Diagnostics;assembly=WindowsBase"
mc:Ignorable="d" x:Class="WpfCrm.tabListManager" xmlns:DPH="clr-namespace:DPH" >
<UserControl.Resources>
<DPH:MarketingListViewModel x:Key="listVM" />
<!-- Note that the above line is giving me an "Object reference not set to an instance of an object" error -->
</UserControl.Resources>
<Grid x:Name="gridMain" DataContext="{StaticResource listVM}" >
<Border Grid.Row="0" Grid.Column="1" Margin="10"
Style="{StaticResource WidgetStyle}" >
<Grid x:Name="gridListManagement" >
<Label x:Name="labelManageLists" Content="Manage Lists" MouseDown="labelManageLists_MouseDown"
Style="{StaticResource WidgetTitleStyle}"
Grid.Row="0" Grid.Column="0" />
<StackPanel Grid.Row="0" Grid.Column="2" Orientation="Horizontal" HorizontalAlignment="Right" >
<Label x:Name="llNewList" Content="new" MouseDown="llNewList_MouseDown"
Style="{StaticResource LinkLabelStyle}"
HorizontalAlignment="Right" />
<Label x:Name="llCloseManageLists" Content="close" MouseDown="llCloseManageLists_MouseDown"
Style="{StaticResource LinkLabelStyle}"
HorizontalAlignment="Right" />
</StackPanel>
<Label x:Name="labelListName" Content="Name" Grid.Row="1" Grid.Column="0" />
<Grid Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2" HorizontalAlignment="Stretch" >
<ComboBox x:Name="cbLists" SelectedIndex="-1" SelectionChanged="cbLists_SelectionChanged" IsReadOnly="True"
ItemsSource="{Binding Path=AllMarketingLists}"
DisplayMemberPath="Name"
SelectedValuePath="Id"
Visibility="{Binding Path=State, Converter={StaticResource ViewStateToVisibilityConverter} }"/>
<TextBox x:Name="tbListName"
Text="{Binding Path=OList.Name}"
Visibility="{Binding Path=State, Converter={StaticResource EditStateToVisibilityConverter} }"/>
</Grid>
<Label x:Name="labelListDescription" Content="Description" Grid.Row="2" Grid.Column="0" />
<Grid Grid.Row="2" Grid.Column="1" Grid.ColumnSpan="2" >
<TextBlock x:Name="textblockListDescription" TextWrapping="Wrap"
Text="{Binding Path=OList.Notes}"
Visibility="{Binding Path=State, Converter={StaticResource ViewStateToVisibilityConverter} }"
Grid.ColumnSpan="2" />
<TextBox x:Name="tbListDescription" TextWrapping="Wrap"
Text="{Binding Path=OList.Notes}"
Visibility="{Binding Path=State, Converter={StaticResource EditStateToVisibilityConverter} }"
Grid.ColumnSpan="2" />
</Grid>
<StackPanel Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="3" HorizontalAlignment="Right" Orientation="Horizontal" >
<Button x:Name="buttonEditList" Content="Edit" Click="buttonEditList_Click"
Visibility="{Binding Path=State, Converter={StaticResource ViewStateToVisibilityConverter} }"
Width="60" Margin="3" />
<Button x:Name="buttonSaveList" Content="Save" Click="buttonSaveList_Click"
Visibility="{Binding Path=State, Converter={StaticResource EditStateToVisibilityConverter} }"
Width="60" Margin="3" />
<Button x:Name="buttonCancel" Content="Cancel" Click="buttonCancel_Click"
Visibility="{Binding Path=State, Converter={StaticResource EditStateToVisibilityConverter} }"
Width="60" Margin="3" />
</StackPanel>
</Grid>
</Border>
</Grid>
And the code-behind has a few methods like:
private void buttonEditList_Click(object sender, RoutedEventArgs e)
{
listVM.State = UiState.Edit;
}
Does anyone have ideas on why the controls aren't updating their visibility after the State change?
Kind thanks,
DPH
EDIT -- Converters:
[ValueConversion(typeof(WpfCrm.UiState), typeof(System.Windows.Visibility))]
public class EditStateToVisibilityConverter: IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
UiState state = (UiState)value;
if (state == UiState.View) return Visibility.Collapsed;
else return Visibility.Visible;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return null;
}
}
[ValueConversion(typeof(WpfCrm.UiState), typeof(System.Windows.Visibility))]
public class ViewStateToVisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
UiState state = (UiState)value;
if (state == UiState.View) return Visibility.Visible;
else return Visibility.Collapsed;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return null;
}
}
You seem to be used two different instances of your view model, one declared and used in XAML
<UserControl.Resources>
<DPH:MarketingListViewModel x:Key="listVM" />
</UserControl.Resources>
<Grid DataContext="{StaticResource listVM}" >
and one in code-behind (from comment):
listVM = new MarketingListViewModel();
You should of course be using only one. So change your code behind declaration to
listVM = (MarketingListViewModel)Resources["listVM"];
OK, there is a mistake. You declare listVM as
var listVM = new MarketingListViewModel();
But this is not the listVM from your XAML. In XAML you have created another instance of MarketingListViewModel. So, when you try to change listVM that was declared in code, nothing happens because this object is not DataContext of your Grid.
In your Click handler you have to write the following:
private void buttonEditList_Click(object sender, RoutedEventArgs e)
{
var _listVM = (MarketingListViewModel)FindResource("listVM");
_listVM.State = UiState.Edit;
}
OR replace your listVM declaration in code-behind with this one:
listVM = (MarketingListViewModel)FindResource("listVM");
Then you won't need to change event handlers.
Hope, it helps.
Today I have a problem with selected default CheckBox. But First i show my code:
<ScrollViewer>
<ListView ItemsSource="{Binding itemsSource, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}">
<ListView.ItemTemplate>
<DataTemplate>
<Expander IsExpanded="True">
<Expander.Header>
<Label Content="{Binding AttrName, Mode=OneWay}" />
</Expander.Header>
<ListView Margin="20, 0, 0, 0" ItemsSource="{Binding subItemSource}" BorderBrush="Transparent" >
<ListView.ItemTemplate>
<DataTemplate>
<RadioButton GroupName="{Binding DataContext.AttrName, RelativeSource={RelativeSource AncestorType=ItemsControl}}"
Content="{Binding}"
<!-- What should I bind to to get item checked? -->
IsChecked={}/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Expander>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</ScrollViewer>
So i have a nested binding where in CheckBoxes I bind GroupName to parent data context. My itemsSource contains the following properties:
int DefaultValue { get; set; }
List<int> subItemSource { get; set; }
And all I want now is to mark RadioButton when actual binding value is equal to DefaultValue. How should I do this? Should I write validator?
I'll start by writing a converter class
class ElementComparer : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return values[0] == values[1];
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
then declare the converter as a resource where l: is your namespace to converter
<l:ElementComparer x:Key="ElementComparer"/>
then in your data template
<DataTemplate>
<RadioButton GroupName="{Binding DataContext.AttrName, RelativeSource={RelativeSource AncestorType=ItemsControl}}"
Content="{Binding}"
<RadioButton.IsChecked>
<MultiBinding Converter="{StaticResource ElementComparer}" Mode="OneWay">
<Binding Path="DataContext.DefaultValue" RelativeSource="{RelativeSource AncestorType=ItemsControl}"/>
<Binding />
</MultiBinding>
</RadioButton.IsChecked>
provided the datacontext of the ItemsControl is containing the property for default value to compare with, the trick is to compare the selected item of the list to the current item to detect if it is default item, and will return true from converter and hence radio will be checked
I am trying to make a field in ListView editable.
I mean when I select row in listView one field becomes textbox instead of textblock.
But it doesnt work - I see both controls all the time.
xaml:
<Window x:Class="fastnn_speedTest.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:local="clr-namespace:fastnn_speedTest"
DataContext="{Binding RelativeSource={RelativeSource Self}}"
Title="fastnn: not saved" Height="300" Width="300">
<Window.Resources>
<local:BoolToVisibilityConverter x:Key="VisibilityOfBool" />
<local:StringToIntValueConverter x:Key="StringToInt" />
<local:StringToFloatValueConverter x:Key="StringToFloat" />
<ObjectDataProvider MethodName="GetValues" ObjectType="{x:Type sys:Enum}" x:Key="ActivationEnum">
<ObjectDataProvider.MethodParameters>
<x:Type x:TypeName="local:Network+Layer+ActivFunction" />
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
<ObjectDataProvider MethodName="GetValues" ObjectType="{x:Type sys:Enum}" x:Key="ComputeMethodEnum">
<ObjectDataProvider.MethodParameters>
<x:Type x:TypeName="local:Training+ComputeMethodEnum" />
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
<Style TargetType="{x:Type TextBlock}" x:Key="ListTextBlockStyle">
<Setter Property="VerticalAlignment" Value="Center" />
<Setter Property="Visibility" Value="{Binding Path=IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListViewItem}}, Converter={StaticResource VisibilityOfBool}, ConverterParameter=True}" />
</Style>
<Style TargetType="{x:Type FrameworkElement}" x:Key="ListTextBoxStyle">
<Setter Property="VerticalAlignment" Value="Center" />
<Setter Property="Visibility" Value="{Binding Path=IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListViewItem}}, Converter={StaticResource VisibilityOfBool}, ConverterParameter=False}" />
</Style>
<DataTemplate x:Key="ActivationTemplate">
<ComboBox ItemsSource="{Binding Source={StaticResource ActivationEnum}}" SelectedValue="{Binding Path=Activation}" Width="100"/>
</DataTemplate>
<DataTemplate x:Key="NeuronsTemplate">
<Grid>
<TextBox Text="{Binding Path=Neurons}" Width="40" Style="{Binding Source=StaticResource ListTextBoxStyle }"></TextBox>
<TextBlock Text="{Binding Path=Neurons}" Width="40" Style="{Binding Source=StaticResource ListTextBlockStyle }"></TextBlock>
</Grid>
</DataTemplate>
</Window.Resources>
<Grid Background="LightGray">
<Grid.RowDefinitions>
<RowDefinition Height="auto"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="auto"></RowDefinition>
</Grid.RowDefinitions>
<Menu Grid.Row="0">
<MenuItem Header="File">
<MenuItem Header="New" Click="MenuNew_Click"></MenuItem>
<MenuItem Header="Open" Click="MenuOpen_Click"></MenuItem>
<Separator></Separator>
<MenuItem Header="Save" Click="MenuSave_Click"></MenuItem>
<MenuItem Header="Save As" Click="MenuSaveAs_Click"></MenuItem>
<Separator></Separator>
<MenuItem Header="Exit"></MenuItem>
</MenuItem>
</Menu>
<TabControl Grid.Row="1" Name="Tabs">
<TabItem Header="Network">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="auto"></RowDefinition>
</Grid.RowDefinitions>
<ListView Grid.Row="0" x:Name="NetworkListview" ItemsSource="{Binding network.Layers}" IsSynchronizedWithCurrentItem="True">
<ListView.View>
<GridView>
<GridViewColumn Width="100" Header="layer name" DisplayMemberBinding="{Binding Name}"/>
<GridViewColumn Width="60" Header="neurons" CellTemplate="{StaticResource NeuronsTemplate}"/>
<GridViewColumn Width="110" Header="activation" CellTemplate="{StaticResource ActivationTemplate}"/>
</GridView>
</ListView.View>
</ListView>
<UniformGrid Grid.Row="1" Rows="1">
<Button Name="AddLayerButton" Click="AddLayerButton_Click">Add layer</Button>
<Button Name="RemoveLayerButton" Click="RemoveLayerButton_Click">Remove layer</Button>
</UniformGrid>
</Grid>
</TabItem>
<TabItem Header="Data set">
<UniformGrid Columns="2" Height="70" Width="220">
<Label>input dimmension</Label>
<TextBox Text="{Binding Path=data_set.InputDimmension, Mode=TwoWay, Converter={StaticResource StringToInt}}"></TextBox>
<Label>output dimmension</Label>
<TextBox Text="{Binding Path=data_set.OutputDimmension, Mode=TwoWay, Converter={StaticResource StringToInt}}"></TextBox>
<Label>number of samples</Label>
<TextBox Text="{Binding Path=data_set.SamplesNumber, Mode=TwoWay}"></TextBox>
</UniformGrid>
</TabItem>
<TabItem Header="Training">
<UniformGrid Columns="2" Width="230" Height="170">
<Label>learning rate</Label>
<TextBox Text="{Binding Path=training.LearningRate, Mode=TwoWay, Converter={StaticResource StringToFloat}}"></TextBox>
<Label>epochs</Label>
<TextBox Text="{Binding Path=training.Epochs, Mode=TwoWay, Converter={StaticResource StringToInt}}"></TextBox>
<Label>weights stddev</Label>
<TextBox Text="{Binding Path=training.WeightsStddev, Mode=TwoWay, Converter={StaticResource StringToFloat}}"></TextBox>
<Label>srand(0)</Label>
<CheckBox Margin="0,4,0,0" IsChecked="{Binding Path=training.SrandZero}"></CheckBox>
<Label>compute method</Label>
<ComboBox Name="ComputeMethodCombo" ItemsSource="{Binding Source={StaticResource ComputeMethodEnum}}" SelectedValue="{Binding Path=training.ComputeMethod}"></ComboBox>
<Label>select device</Label>
<ComboBox Name="DeviceComboBox" SelectedIndex="{Binding Path=training.DeviceIndex}"></ComboBox>
<Label>click to run test</Label>
<Button Margin="2" Name="RunTestButton" Click="RunTestButton_Click">Run test</Button>
</UniformGrid>
</TabItem>
<TabItem Header="Output">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="auto"></RowDefinition>
</Grid.RowDefinitions>
<TextBox Grid.Row="0" Name="LogTextBox"></TextBox>
<UniformGrid Grid.Row="1" Rows="1">
<Button>Save</Button>
<Button Name="ClearButton" Click="ClearButton_Click">Clear</Button>
<Button>Eerror chart</Button>
<Button>Speed chart</Button>
</UniformGrid>
</Grid>
</TabItem>
</TabControl>
<StatusBar Grid.Row="2">
<StatusBarItem>
<TextBlock>text</TextBlock>
</StatusBarItem>
</StatusBar>
</Grid>
converter:
public class BoolToVisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType,
object parameter, System.Globalization.CultureInfo culture)
{
bool param = bool.Parse(parameter as string);
bool val = (bool)value;
return val == param ? Visibility.Visible : Visibility.Hidden;
}
public object ConvertBack(object value, Type targetType,
object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
and a Network class which contains ObservableCollection which is bound to listview:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows;
using System.Xml.Serialization;
namespace fastnn_speedTest
{
public class Network
{
public class Layer : INotifyPropertyChanged
{
public enum ActivFunction { LINEAR, EXPONENTIAL, ARCUSTANGENT }
private string name;
[XmlIgnore]
public string Name
{
get
{
return name;
}
set
{
name = value;
RaisePropertyChanged("Name");
}
}
[XmlAttribute]
public ActivFunction Activation { get; set; }
[XmlAttribute]
public int Neurons { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void RaisePropertyChanged(String propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
public ObservableCollection<Layer> Layers { get; set; }
public Network()
{
Layers = new ObservableCollection<Layer>();
}
public void AddLayer(Layer layer)
{
int last = Layers.Count;
if (last > 0)
{
Layers.Last().Name = "Layer " + last + " (hidden)";
}
layer.Name = "Layer " + (last + 1) + " (output)";
Layers.Add(layer);
}
public void RemoveLayer(int index)
{
if( index >= 0 && index < Layers.Count )
Layers.RemoveAt(index);
}
public void Clear()
{
Layers.Clear();
}
public void Validate()
{
if (Layers.Count < 1)
throw new ArgumentException("minimum number of layers is 1");
foreach (Layer layer in Layers)
{
if (layer.Neurons <= 0)
throw new ArgumentException("neurons in each layer must be > 0");
}
if(Layers.Last().Activation != Layer.ActivFunction.LINEAR)
throw new ArgumentException("last layer must be linear");
}
}
}
Have a look at the below links
http://www.switchonthecode.com/tutorials/wpf-tutorial-using-the-listview-part-3-in-place-edit
EDIT
You may have followed the tut but couple of things you missed is what causing the probs.First of all you are trying to use the inbuilt BooleanToVisibility converter but i think in your scenario its not gonna help.You have to crate a custom value converter like mentioned in the tutorial.
public class BoolToVisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType,
object parameter, System.Globalization.CultureInfo culture)
{
bool param = bool.Parse(parameter as string);
bool val = (bool)value;
return val == param ? Visibility.Visible : Visibility.Hidden;
}
public object ConvertBack(object value, Type targetType,
object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
Also you have to mention your converter like this
<Setter Property="Visibility" Value="{Binding Path=IsSelected,
RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type ListViewItem}},
Converter={StaticResource VisibilityOfBool}, ConverterParameter=False}" />
Make these changes and you are good to go....
Why don't you use the data grid? You can style it to look like a list and it already provides the edit mode functionality. You can use a TemplateColumn to provide custom display and editing views.
I have:
<StackPanel DataContext="{Binding Path =MyContext}">
<TextBox Text="{Binding Path =Content}" x:Name="tbName" IsReadOnly="False">
</TextBox>
<CheckBox x:Name="cboxName" Content="Is null ?" Click="cboxName_Click" IsChecked="{Binding Path=THIS, Converter={StaticResource MyContextToBoolConverter}}">
</CheckBox>
</StackPanel>
public class MyContextToBoolConverter: IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return (value!=null);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return parameter;
}
}
I just only want to get DataContext to checkbox from StackPanel.
You should replace THIS with . or completely remove the Path from the Binding. This will create a binding directly to the DataContext.
IsChecked="{Binding Converter={StaticResource MyContextToBoolConverter}}"
Or try this -
<StackPanel x:Name="StackPanel" DataContext="{Binding Path =MyContext}">
<TextBox Text="{Binding Path =Content}" x:Name="tbName" IsReadOnly="False" />
<CheckBox x:Name="cboxName" Content="Is null ?"
Click="cboxName_Click"
IsChecked="{Binding ElementName=StackPanel, Path=DataContext, Converter={StaticResource MyContextToBoolConverter}}">
</CheckBox>
</StackPanel>