I have a UserControl that has a ViewModel containing an instance of my own custom class, call it Person. This ViewModel is set as the DataContext of the control. I am wanting to use this control in my main window which has, in its ViewModel a List of type Person called People. I am calling the control in my xaml like this:
<ItemsControl ItemsSource="{Binding People}">
<ItemsControl.ItemsTemplate>
<DataTemplate>
<userControls:PersonDetails />
</DataTemplate>
</ItemsControl.ItemsTemplate>
</ItemsControl>
Properties within the control are bound in this manner.
<TextBlock Text="{Binding Person.Name}" />
When I run I am getting the correct number of Controls for the amount of People in the list but no details are populated. I know I am doing something simple wrong but can't find it. Please help.
EDIT:
My UserControl xaml looks like this:
<UserControl x:Class="AddressBook.UserControls.PersonDetails"
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:AddressBook.UserControls"
xmlns:vm="clr-namespace:AddressBook.ViewModels"
xmlns:enums="clr-namespace:AddressBook.Models"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="1000">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="40" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<TextBlock Style="{StaticResource PersonDetailHeader}" Text="Person Name:" />
<TextBlock Style="{StaticResource PersonDetailValue}" Grid.Column="1" Text="{Binding Person.Name,
UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Style="{StaticResource PersonDetailHeader}" VerticalAlignment="Center" Grid.Row="1" Text="Street Address:" />
<TextBlock Style="{StaticResource PersonDetailValue}" Grid.Row="1" Grid.Column="1"
Text="{Binding Person.StreetAddress, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Style="{StaticResource PersonDetailHeader}" Grid.Row="2" Text="Town:" />
<TextBlock Style="{StaticResource PeronDetailValue}" Grid.Row="2" Grid.Column="1"
Text="{Binding Person.Town, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Style="{StaticResource PersonDetailHeader}" Grid.Row="3" Text="County:" />
<TextBlock Style="{StaticResource PersonDetailValue}" Grid.Row="3" Grid.Column="1"
Text="{Binding Person.County, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Style="{StaticResource PersonDetailHeader}" Grid.Row="4" Text="Postcode:" />
<TextBlock Style="{StaticResource PersonDetailValue}" Grid.Row="4" Grid.Column="1"
Text="{Binding Person.Postcode, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Style="{StaticResource PersonDetailHeader}" Grid.Row="5" Text="Phone:" />
<TextBlock Style="{StaticResource PersonDetailValue}" Grid.Row="5" Grid.Column="1"
Text="{Binding Person.Phone, UpdateSourceTrigger=PropertyChanged}" />
<StackPanel Grid.Row="7" Grid.ColumnSpan="2" HorizontalAlignment="Center" Orientation="Horizontal">
<Button Style="{StaticResource ButtonStyle}" Content="Click" Command="{Binding ButtonClickCommand}" />
</StackPanel>
</Grid>
UserControl ViewModel:
public class PersonDetailsViewModel
{
public Person Person { get; set; }
public Command ButtonClickCommand { get; }
public PersonDetailsViewModel()
{
ButtonClickCommand = new Command(ButtonClick);
}
private void ButtonClick(object obj)
{
throw new NotImplementedException();
}
UserControl.xaml.cs:
public partial class PersonDetails : UserControl
{
public PersonDetails()
{
InitializeComponent();
}
}
Person.cs
public class Person : BaseModel
{
public string Name
{
get { return name; }
set
{
name = value;
NotifyPropertyChanged();
}
etc....
MainViewModel:
public class MainViewModel : BaseViewModel
{
public ObservableCollection<Person> People { get; }
= new ObservableCollection<Person>();
public MainViewModel()
{
PopulatePeople();
}
}
Now I understand why you were creating the PersonDetailsViewModel in the UserControl XAML, and what the problem was with the command.
The simplest way to fix this is to make MainViewModel.People a collection of PersonDetailsViewModel instead of Person. That's what I'd do.
But if you want to leave MainViewModel.People as it is, while still using PersonDetailsViewModel inside your UserControl, that makes sense to me. You could do this:
.xaml
<UserControl
x:Class="AddressBook.UserControls.PersonDetails"
DataContextChanged="PersonDetails_DataContextChanged"
...etc...
>
<!-- Give the Grid a name... -->
<Grid x:Name="OuterGrid">
.xaml.cs
public PersonDetails()
{
InitializeComponent();
}
private void PersonDetails_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
// ...so we can give the Grid a different DataContext
OuterGrid.DataContext = new PersonDetailsViewModel {
Person = (Person)this.DataContext
};
}
Now it will inherit a Person for its DataContext, but internally it will use a PersonDetailsViewModel based on that Person.
Not sure if that's what you are trying to do.
If you only wish to display some carac of every Person present in your People List you could do :
<Grid>
<ItemsControl ItemsSource="{Binding People}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid Margin="0,0,0,5">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="100" />
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding Name}" />
<TextBlock Grid.Column="1" Text="{Binding Age}" />
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
That will bind you Text on the Name property of each element of your list, so on the name of each Person of your list.
As your ItemsSource is already bound to People, the Binding of your Items is already on each Person of your List, so you should call your properties directly as {Binding Name} and not {Binding Person.Name}
Related
I have a WPF form that I want to use to manipulate a database table. To get the data out of the database I use Entity Framework Core. I try to follow the MVVM pattern.
So I have a Model called Employee with a number of string properties like Firstname and so on.
The form has a ListView that shows an ObservableCollection of Employee. Further I have a number of TextBoxes to display and manipulate the properties of single Employee objects. The selectedMemberPath of the ListView is bound to a property SelectedEmployee. The setter of SelectedEmployee than copies it's own properties to EditedEmployee. The TextBoxes are bound to EditedEmployee. The idea is, that I don't want to directly edit the ObservableCollection. This should only happen if a save button is clicked.
This is my view model.
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.ChangeTracking;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using XdcCore.Models;
using XdcCore.ViewModels.Commands;
namespace XdcCore.ViewModels
{
class EmployeeEditorVM : List<Employee>, INotifyPropertyChanged
{
public EmployeeSaveCommand EmployeeSaveCommand { get; set; }
public EmployeeEditorVM()
{
EmployeeSearch();
EmployeeSaveCommand = new EmployeeSaveCommand(this);
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
private string employeeSearchText;
public string EmployeeSearchText
{
get { return employeeSearchText; }
set
{
employeeSearchText = value;
OnPropertyChanged("EmployeeSearch");
EmployeeSearch();
}
}
private Employee selectedEmployee;
public Employee SelectedEmployee
{
get { return selectedEmployee; }
set
{
selectedEmployee = value;
OnPropertyChanged("SelectedEmployee");
EditedEmployee = SelectedEmployee;
}
}
private Employee editedEmployee;
public Employee EditedEmployee
{
get { return editedEmployee; }
set
{
editedEmployee = value;
OnPropertyChanged("EditedEmployee");
}
}
private ObservableCollection<Employee> employees;
public ObservableCollection<Employee> Employees
{
get { return employees; }
set
{
employees = value;
OnPropertyChanged("Employees");
}
}
public void EmployeeSearch()
{
using (var context = new XdcContext())
{
if (employeeSearchText != null)
{
var _employees = context.Employee
.Where(x => x.Firstname.Contains(employeeSearchText));
Employees = new ObservableCollection<Employee>(_employees);
}
else
{
var _employees = context.Employee.Select(x => x);
Employees = new ObservableCollection<Employee>(_employees);
}
}
}
public void EmployeeSave()
{
using (var context = new XdcContext())
{
var entity = context.Employee.First(x => x.IdEmployee == SelectedEmployee.IdEmployee);
{
entity.Firstname = SelectedEmployee.Firstname;
entity.Lastname = SelectedEmployee.Lastname;
entity.Initials = SelectedEmployee.Initials;
context.SaveChanges();
}
EmployeeSearch();
}
}
}
}
this is my View:
<Window
x:Class="XdcCore.Views.Editors.EmployeeEditor"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:XdcCore.Views.Editors"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:vm="clr-namespace:XdcCore.ViewModels"
Title="Employee"
Width="800"
Height="450"
mc:Ignorable="d">
<Window.Resources>
<vm:EmployeeEditorVM x:Key="vm" />
</Window.Resources>
<Grid DataContext="{StaticResource vm}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="300" />
<ColumnDefinition Width="115*" />
<ColumnDefinition Width="277*" />
</Grid.ColumnDefinitions>
<!-- left column -->
<Border BorderBrush="DarkGray" BorderThickness="1">
<Grid Grid.Column="0">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="aUTO" />
</Grid.RowDefinitions>
<Label
Grid.Row="0"
Margin="3,3,3,3"
Content="Filter:" />
<TextBox
x:Name="TextBoxSearch"
Grid.Row="1"
Height="25"
Margin="3,0,3,3"
HorizontalContentAlignment="Left"
VerticalContentAlignment="Center"
Text="{Binding EmployeeSearchText, Mode=TwoWay}" />
<ListView
x:Name="ListViewOverview"
Grid.Row="2"
Margin="3,0,3,0"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
ItemsSource="{Binding Employees, Mode=OneWay}"
SelectedItem="{Binding SelectedEmployee, Mode=OneWayToSource}">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Initials}" />
<TextBlock Text=" : " />
<TextBlock Text="{Binding Firstname}" />
<TextBlock Text=" " />
<TextBlock Text="{Binding Lastname}" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Grid Grid.Row="3">
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Button
x:Name="ButtonDelete"
Grid.Column="0"
Height="25"
Margin="3,3,3,3"
Content="Delete"
IsEnabled="False" />
<Button
x:Name="ButtonNew"
Grid.Column="1"
Height="25"
Margin="3,3,3,3"
Content="Add New ..."
IsEnabled="True" />
</Grid>
</Grid>
</Border>
<!-- right Column -->
<Grid Grid.Column="1" Grid.ColumnSpan="2">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<!-- right column, first row -->
<Border
Grid.Row="0"
BorderBrush="DarkGray"
BorderThickness="1">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="25" />
<RowDefinition Height="25" />
<RowDefinition Height="25" />
<RowDefinition Height="25" />
<RowDefinition Height="25" />
<RowDefinition Height="25" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100" />
<ColumnDefinition Width="200" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Label
Grid.Row="0"
Grid.Column="0"
HorizontalAlignment="Right"
Content="First Name" />
<Label
Grid.Row="1"
Grid.Column="0"
HorizontalAlignment="Right"
Content="Last Name" />
<Label
Grid.Row="2"
Grid.Column="0"
HorizontalAlignment="Right"
Content="Initials" />
<Label
Grid.Row="3"
Grid.Column="0"
HorizontalAlignment="Right"
VerticalContentAlignment="Center"
Content="ID" />
<Label
Grid.Row="4"
Grid.Column="0"
HorizontalAlignment="Right"
VerticalContentAlignment="Center"
Content="RCU" />
<Label
Grid.Row="5"
Grid.Column="0"
HorizontalAlignment="Right"
VerticalContentAlignment="Center"
Content="RCT" />
<TextBox
x:Name="TextBoxFirstName"
Grid.Row="0"
Grid.Column="1"
Margin="0,3,3,3"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
HorizontalContentAlignment="Left"
VerticalContentAlignment="Center"
Text="{Binding EditedEmployee.Firstname, Mode=TwoWay}" />
<TextBox
x:Name="TextBoxLastName"
Grid.Row="1"
Grid.Column="1"
Margin="0,3,3,3"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
HorizontalContentAlignment="Left"
VerticalContentAlignment="Center"
Text="{Binding EditedEmployee.Lastname, Mode=TwoWay}" />
<TextBox
x:Name="TextBoxInitials"
Grid.Row="2"
Grid.Column="1"
Margin="0,3,3,3"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
HorizontalContentAlignment="Left"
VerticalContentAlignment="Center"
Text="{Binding EditedEmployee.Initials, Mode=TwoWay}" />
<TextBox
x:Name="TextBoxId"
Grid.Row="3"
Grid.Column="1"
Margin="0,3,3,3"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
HorizontalContentAlignment="Left"
VerticalContentAlignment="Center"
IsReadOnly="True" />
<TextBox
x:Name="TextBoxRCU"
Grid.Row="4"
Grid.Column="1"
Margin="0,3,3,3"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
HorizontalContentAlignment="Left"
VerticalContentAlignment="Center"
IsReadOnly="True" />
<TextBox
x:Name="TextBoxRCT"
Grid.Row="5"
Grid.Column="1"
Margin="0,3,3,3"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
HorizontalContentAlignment="Left"
VerticalContentAlignment="Center"
IsReadOnly="True" />
</Grid>
</Border>
<Grid Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Button
x:Name="ButnSave"
Grid.Column="1"
Width="76"
Height="25"
Margin="60,3,60,0"
HorizontalAlignment="Center"
VerticalAlignment="Top"
Command="{Binding EmployeeSaveCommand}"
Content="Save"
IsEnabled="True" />
</Grid>
<!-- Add new -->
</Grid>
</Grid>
</Grid>
</Window>
In other words: I want to click on an item in the list view, it's details are shown in the text boxes. I can change the text in the text boxes but the changes are not applied to the observable collection (or even database) until I click "save". The problem is, that exactly that happens: when I edit text in the text boxes the changes are also shown in the list view. And I can#t see why.
So, I got the concept of "copy vs point" of a variable wrong.
I had two solutions for my problem.
To my Employee model I added the method Copy:
public partial class Employee
{
public int IdEmployee { get; set; }
public string Initials { get; set; }
public string Firstname { get; set; }
public string Lastname { get; set; }
public string Rcu { get; set; }
public DateTime Rct { get; set; }
public Employee Copy()
{
return (Employee)this.MemberwiseClone();
}
}
Then I Changed my ViewModel so that EditedEmployee is a copy of SelectedEmployee
private Employee selectedEmployee;
public Employee SelectedEmployee
{
get { return selectedEmployee; }
set
{
selectedEmployee = value;
OnPropertyChanged("SelectedEmployee");
if (SelectedEmployee != null)
{
EditedEmployee = SelectedEmployee.Copy();
}
}
}
private Employee editedEmployee;
public Employee EditedEmployee
{
get { return editedEmployee; }
set
{
editedEmployee = value;
OnPropertyChanged("EditedEmployee");
}
}
The problem with this approach is, that if I mess around with the database and then need to run Scaffold-DbContext (I prefer the code-first approach of EFC) again, I would have to modify all models again. A solution to that might be some a second, modified Model that inherits from the original Model and then adds the Copy method.
My second approach is to bind the ListView via SelectedIndex instead of SelectedItem.
<ListView
...
ItemsSource="{Binding Employees, Mode=OneWay}"
SelectedIndex="{Binding SelectedItemIndex, Mode=TwoWay}">
In the ViewModel this is then represented by an int property. If this int is set (and >= 0) Employee gets copied EmployeeWorkingCopy. Furthermore if EmployeeWorkingCopy is set a single Employee dubbed EditedEmployee is set as the Employee of the working copy with the selected index.
private int selectedItemIndex;
public int SelectedItemIndex
{
get { return selectedItemIndex; }
set
{
selectedItemIndex = value;
if (SelectedItemIndex >= 0)
EmployeesWorkingCopy = new ObservableCollection<Employee>(Employees);
}
}
private Employee editedEmployee;
public Employee EditedEmployee
{
get { return editedEmployee; }
set
{
editedEmployee = value;
OnPropertyChanged("EditedEmployee");
}
}
private ObservableCollection<Employee> employeesWorkingCopy;
public ObservableCollection<Employee> EmployeesWorkingCopy
{
get { return employeesWorkingCopy; }
set
{
employeesWorkingCopy = value;
EditedEmployee = EmployeesWorkingCopy[SelectedItemIndex];
}
}
Thanks a lot for pointing out my misconception.
<Page.Resources>
<ResourceDictionary>
<BooleanToVisibilityConverter x:Key="booleanToVisibilityConverter" x:Name="testTest" />
</ResourceDictionary>
</Page.Resources>
itemscontrol:
<Grid Grid.Row="1" Grid.ColumnSpan="2" Name="testName">
<ScrollViewer VerticalScrollBarVisibility="Hidden" PanningMode="Both">
<ItemsControl ItemsSource="{Binding Path=NextMeetingList}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Grid.Column="0" Grid.Row="0">
<Border x:Name = "myVariable" Grid.Column="0" Grid.Row="0" Margin="10" Height="30" Background="#A2C2E7" CornerRadius="5" BorderBrush="#A2C2E7">
<Grid Margin="8,0,8,0" Background="#A2C2E7">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"></ColumnDefinition>
<ColumnDefinition Width="1*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Foreground="White" FontWeight="Bold" FontSize="15" Margin="0,4,0,0" HorizontalAlignment="Left">month</TextBlock>
<TextBlock Grid.Row="0" Grid.Column="1" Foreground="White" FontWeight="Bold" FontSize="15" Margin="0,4,0,0" HorizontalAlignment="Right">1 Meeting</TextBlock>
</Grid>
</Border>
<Border Grid.Column="0" Grid.Row="0" Margin="10" Height="60" Background="GhostWhite" CornerRadius="3" BorderBrush="{Binding BorderColor}" BorderThickness="0,8,0,0">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="118"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="60"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="40" Margin="10,5,0,0" Style="{DynamicResource Lato-Semibold}" Text="{Binding endDate.Day}"/>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="12" Margin="77,13,0,0" Height="Auto" Style="{DynamicResource Lato-Semibold}" Text="{Binding DayString}"/>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="14" Margin="70,26,0,0" Height="Auto" Style="{DynamicResource Lato-Semibold}" Text="{Binding endDate.Hour}"/>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="14" Margin="86,26,0,0" Height="Auto" Style="{DynamicResource Lato-Semibold}" Text=":"/>
<TextBlock Grid.Row="0" Grid.Column="0" HorizontalAlignment="Left" FontSize="14" Margin="90,26,0,0" Height="Auto" Style="{DynamicResource Lato-Semibold}" Text="{Binding MinuteString}"/>
<Border Grid.Row="0" Grid.Column="0" Width="1" BorderBrush="#BABABA" Height="40" Margin="115,-6,0,0" BorderThickness="1" HorizontalAlignment="Left"></Border>
<TextBlock Grid.Row="0" Grid.Column="1" HorizontalAlignment="Left" Text="{Binding subject}" FontWeight="Bold" FontSize="17" Margin="10,10,0,0"/>
<TextBlock Grid.Row="0" Grid.Column="1" Width="Auto" TextWrapping="Wrap" HorizontalAlignment="Left" Text="{Binding descr}" FontSize="10" Margin="20,27,150,0"/>
<TextBlock Grid.Row="0" Grid.Column="1" HorizontalAlignment="Right" Text="{Binding companyName}" FontSize="10" Margin="0,10,30,0"/>
<TextBlock Grid.Row="0" Grid.Column="1" HorizontalAlignment="Right" Text="sala del consiglio" FontSize="10" Margin="0,27,30,0"/>
<TextBlock Grid.Row="0" Grid.Column="1" HorizontalAlignment="Right" Text=">" FontSize="15" VerticalAlignment="Center" Margin="0,-5,10,0"/>
</Grid>
</Border>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</ScrollViewer>
</Grid>
Hello everyone , I should be able to make a grid Collapsed inside a ItemsControl in WPF .
The problem is that I can not understand how to use the booleanToVisibilityConverter from code behind .
Maybe I'm missing out on a glass of water but I can not connect how to do, if the name TestTest septum can not see it then the code-behind .
from code behind i don't see "myVariable"
To get hold of the converter from code-behind, you'd have to look it up in the Page's Resources dictionary. Do something like this in your Page class:
IValueConverter converter = this.Resources["booleanToVisibilityConverter"] as IValueConverter;
Giving the converter's resource entry a Name is not necessary; here you want to use the Key. Also, converters are normally used with XAML bindings -- if you want one in code, you can just instantiate one:
IValueConverter converter = new BooleanToVisibilityConverter();
Common usage goes something like this:
<Window.Resources>
<ResourceDictionary>
<BooleanToVisibilityConverter x:Key="Converter" />
</ResourceDictionary>
</Window.Resources>
<Grid Visibility="{Binding Display, Converter={StaticResource Converter}}">
...
</Grid>
Code-behind, using the window class itself as the data context:
public partial class MainWindow
{
public bool Display { get; set; };
public MainWindow()
{
InitializeComponent();
DataContext = this; // For the binding
Display = true;
}
}
Okay, one more, this time without data binding or converter:
<Grid x:Name="myGrid">
...
</Grid>
Code-behind:
public partial class MainWindow
{
public MainWindow()
{
InitializeComponent();
myGrid.Visibility = Visibility.Visible;
}
}
The above doesn't explain why the OP couldn't reference "myVariable" from code-behind. That's because it's in a template, which is instantiated (dynamically) once per item in the collection.
It's still possible to get at it from code -- dynamically. For example, this XAML uses a DataTemplate:
<ItemsControl ItemsSource="{Binding Names}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid x:Name="innerGrid" Loaded="OnGridLoaded" DataContext="{Binding Name, Mode=OneWay}">
<TextBox Text="{Binding Path=., Mode=OneWay}" />
</Grid>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
The following code-behind lets us reach into the template and make "innerGrid" disappear selectively:
public class Data
{
public string Name { get; }
public Data(string name)
{
Name = name;
}
}
public partial class MainWindow
{
public Data[] Names { get; } = { new Data("Hello"), new Data("World") };
public MainWindow()
{
InitializeComponent();
DataContext = this;
}
private void OnGridLoaded(object sender, RoutedEventArgs e)
{
Grid outerGrid = sender as Grid;
Grid innerGrid = outerGrid?.FindName("innerGrid") as Grid;
if (innerGrid != null)
{
string name = innerGrid.DataContext as string;
if (name == "Hello")
{
innerGrid.Visibility = Visibility.Collapsed;
}
}
}
}
(To make the string easily accessible I bound the Data object to the "innerGrid" DataContext.)
I'm trying to find a way to display a horizontal List of items in WPF, the trick is that the Window which contains the List will be displayed on various screen sizes and all the items in the list need to be resized to fill the available space without any use of scroll bars.
I've found that a ViewBox control can be used to achieve the desired affect, but the ViewBox works only if I set <RowDefinition Height="300"/>.This approach doesn't work because if you have a certain number of items in the List they start becoming cut off.
If I remove <RowDefinition Height="300"/> then the first item in the list fills the screen and the rest are cut off
Any suggestions on how I can make all the items in the list resize to fill the available space no matter what the screen resolution is?
XAML:
<Window x:Class="ViewBoxExample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" WindowState="Maximized">
<ItemsControl ItemsSource="{Binding Path=Employees}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3*" />
<ColumnDefinition Width="3*" />
<ColumnDefinition Width="3*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="300"/>
</Grid.RowDefinitions>
<Viewbox Grid.Row="0" Grid.Column="0">
<TextBlock Text="{Binding Path=Name}" />
</Viewbox>
<Viewbox Grid.Row="0" Grid.Column="1">
<TextBlock Text="{Binding Path=Surname}" />
</Viewbox>
<Viewbox Grid.Row="0" Grid.Column="2">
<TextBlock Text="{Binding Path=Age}" />
</Viewbox>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Window>
C#:
using System.Collections.Generic;
using System.Windows;
namespace ViewBoxExample
{
public partial class MainWindow : Window
{
public List<Employee> _employees = new List<Employee>();
public List<Employee> Employees
{
get { return _employees; }
set { _employees = value; }
}
public MainWindow()
{
InitializeComponent();
Employees = new List<Employee>()
{
new Employee{ Name="Name1",Surname="Surname1",Age=20},
new Employee{ Name="Name2",Surname="Surname2",Age=30},
new Employee{ Name="Name3",Surname="Surname3",Age=40},
new Employee{ Name="Name4",Surname="Surname4",Age=50},
new Employee{ Name="Name5",Surname="Surname5",Age=60},
};
this.DataContext = this;
}
}
public class Employee
{
public string Name { get; set; }
public string Surname { get; set; }
public int Age { get; set; }
}
}
Just put your ItemsControl in ViewBox
<Viewbox>
<ItemsControl ItemsSource="{Binding Path=Employees}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3*" />
<ColumnDefinition Width="3*" />
<ColumnDefinition Width="3*" />
</Grid.ColumnDefinitions>
<Viewbox Grid.Row="0" Grid.Column="0">
<TextBlock Text="{Binding Path=Name}" />
</Viewbox>
<Viewbox Grid.Row="0" Grid.Column="1">
<TextBlock Text="{Binding Path=Surname}" />
</Viewbox>
<Viewbox Grid.Row="0" Grid.Column="2">
<TextBlock Text="{Binding Path=Age}" />
</Viewbox>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Viewbox>
EDIT: if i am doing the same type of thing i would use the actual Height and Width approach as explained by Kent Boogaart in this Answer
Here is my problem i need to solve.
My data content is in DemoList class:
NOTICE: DemoHeader object contains a ObservableCollection of DemoItem objects, and DemoList object contains ObservableCollection of DemoHeader objects
public enum Type
{
article,
product,
material
}
public class DemoHeader
{
private ObservableCollection<DemoItem> _items;
public ObservableCollection<DemoItem> Items
{
get { return _items; }
set { _items = value; }
}
public DemoHeader(string document)
{
this._salesOrder = document;
_items = new ObservableCollection<DemoItem>();
}
private string _salesOrder;
public string SalesOrder
{
get { return _salesOrder; }
set { _salesOrder = value; }
}
}
public class DemoItem
{
public DemoItem(string name, Type type)
{
this._name = name;
this._type = type;
}
private Type _type;
public Type Type
{
get { return _type; }
set { _type = value; }
}
private string _name;
public string Name
{
get { return _name; }
set { _name = value; }
}
}
public class DemoList : ObservableCollection<DemoHeader>//, ICollectionView
{
public DemoList()
{
DemoHeader dd = new DemoHeader("Doc-1");
dd.Items.Add(new DemoItem("T-1", Type.article));
dd.Items.Add(new DemoItem("M-1", Type.material));
DemoHeader dd2 = new DemoHeader("Doc-2");
dd2.Items.Add(new DemoItem("P-1", Type.product));
dd2.Items.Add(new DemoItem("P-2", Type.product));
this.Add(dd);
this.Add(dd2);
}
}
XAML:
NOTICE: I have 4 CollectionViewSource for each ListBox.
<Window x:Class="WuZet.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:c="clr-namespace:WuZet"
Title="WuZet" WindowStartupLocation="CenterScreen" ResizeMode="CanResize" Loaded="window_loaded" Background="#ECE9D8" WindowStyle="ToolWindow" Icon="/WuZet;component/Images/ksi_ikona.ico" Topmost="True" WindowState="Maximized" SizeToContent="WidthAndHeight">
<Window.Resources>
<CollectionViewSource x:Key="list" Source="{Binding}"></CollectionViewSource>
<CollectionViewSource x:Key="wares" Source="{Binding Source={StaticResource list}, Path=Items}" Filter="wareFilter"></CollectionViewSource>
<CollectionViewSource x:Key="materials" Source="{Binding Source={StaticResource list}, Path=Items}" Filter="materialFilter"></CollectionViewSource>
<CollectionViewSource x:Key="products" Source="{Binding Source={StaticResource list}, Path=Items}" Filter="productFilter"></CollectionViewSource>
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="80"></RowDefinition>
<RowDefinition Height="20"></RowDefinition>
<RowDefinition Height="200"></RowDefinition>
<RowDefinition Height="50"></RowDefinition>
<RowDefinition Height="200"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<StackPanel Grid.Row="0" Grid.ColumnSpan="2" Margin="5,5,5,5">
<TextBox/>
<Button Content="ok" Margin="0,5,0,0" HorizontalAlignment="Stretch" Height="30" Width="150" Click="Button_Click"/>
</StackPanel>
<StackPanel Grid.RowSpan="2" Grid.Column="2">
<ListBox Name="orders" IsEnabled="{Binding ElementName=check, Path=IsChecked}" Margin="85,5,85,5" Height="70" ItemsSource="{Binding Source={StaticResource list}}" DisplayMemberPath="SalesOrder"/>
<CheckBox Name="check" HorizontalAlignment="Center" Content="Wybierz zamówienie" IsChecked="False"/>
</StackPanel>
<GroupBox Header="Wares" Grid.Row="2" Grid.Column="0">
<ListBox Name="lbWares" ItemsSource="{Binding Source={StaticResource wares}}" >
<ListBox.ItemTemplate>
<DataTemplate>
<!--<StackPanel Orientation="Horizontal">-->
<TextBlock Text="{Binding Path=Name}"></TextBlock>
<!--<TextBlock Text="{Binding ZaE_TwrKod}" />
<TextBlock Text=", " />
<TextBlock Text="{Binding ZaE_Ilosc}" />
<TextBlock Text=", " />
<TextBlock Text="{Binding ZaE_TwrNazwa}" />-->
<!--</StackPanel>-->
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</GroupBox>
<GroupBox Header="Materials" Grid.Row="2" Grid.Column="1">
<ListBox Name="lbMaterials" ItemsSource="{Binding Source={StaticResource materials}}">
<ListBox.ItemTemplate>
<DataTemplate>
<!--<StackPanel Orientation="Horizontal">-->
<TextBlock Text="{Binding Path=Name}"/>
<!--<TextBlock Text=", " />
<TextBlock Text="{Binding ZaE_Ilosc}" />
<TextBlock Text=", " />
<TextBlock Text="{Binding ZaE_TwrNazwa}" />-->
<!--</StackPanel>-->
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</GroupBox>
<GroupBox Header="Products" Grid.Row="2" Grid.Column="2">
<ListBox Name="lbProducts" ItemsSource="{Binding Source={StaticResource products}}">
<ListBox.ItemTemplate>
<DataTemplate>
<!--<StackPanel Orientation="Horizontal">-->
<TextBlock Text="{Binding Path=Name}"/>
<!--<TextBlock Text=", " />
<TextBlock Text="{Binding ZaE_Ilosc}" />
<TextBlock Text=", " />
<TextBlock Text="{Binding ZaE_TwrNazwa}" />
</StackPanel>-->
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</GroupBox>
</Window>
DemoList object is binding to CollectionViewList x:Key=list.
Here is my buisiness logic i need to implement:
If checkbox is marked i need to return selected ListBoxItem to the
corresponding containers [wares, products, materials] - this logic is
working
If checkbox is unmarked i need to return ALL items
[ObservableCollection] of ALL headers to the corresponding
containers [wares, products, materials]
I'm stuck right here, can anyone suggest me a solution?
--- 2013-11-04 20:38
Sry for misunderstanding, and for my bad english.
I uploaded some screen to be more clear.
http://imgur.com/UowQrRP
As you see on the screen i need to implement behavior for checkbox.
When it is unchecked each DemoItem object must be display in one of 3 containers.
Each container is bind to CollectionViewSource.
I have the following XAML:
<Grid x:Name="ContentPanelDaily"
Grid.Row="1"
<Grid.RowDefinitions>
<RowDefinition Height="40" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="60" />
<ColumnDefinition Width="80" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0"
Grid.Column="0"
Style="{StaticResource PhoneTextAccentStyle}"
Margin="0,0,0,0">
First
</TextBlock>
<TextBlock Grid.Row="0"
Grid.Column="1"
Style="{StaticResource PhoneTextAccentStyle}"
Margin="0,0,0,0">
Second
</TextBlock>
</Grid>
How can i detect which row was clicked in Tap event? I have tried to find SelectedRow or something like this but it seems there is no anything like this in Grid. Thank you very much.
Put your data into a button, and subscribe to on OnClick event.
<Button OnClick="evetnHandler">
<TextBlock Grid.Row="0"
Grid.Column="0"
Style="{StaticResource PhoneTextAccentStyle}"
Margin="0,0,0,0">
First
</TextBlock>
</Button>
Also, as #Rachel said: you can use a ListBox.
<ListBox ItemsSource="{Binding Items}"
SelectedItem="{Binding Selected, Type=TwoWay}">
<ListBox.ItemTemplate>
<DataTemlate>
<TextBlock
Style="{StaticResource PhoneTextAccentStyle}"
Margin="0,0,0,0" Text="{Binding Name}"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
And in a code-behind create
public ObservableCollection<DataItem> Items {get;set;}
private DataItem _selected;
public DataItem Selected
{
get {return _selected;}
set
{
_selected = value;
//ha! item selected!!! handle it
}
}
public class DataItem
{
public string Name {get;set;}
}