I would like to bind a Silverlight ListBox to Dictionary<int, string>. I have tried the following without success:
someListBox.ItemsSource = someItems;
and
someListBox.ItemsSource = someItems.Values;
Both of those approaches will work assuming the dictionary is fully populated at the time of the assignment. Given simply this in your user control:-
<ListBox x:Name="lst" />
then this code:-
var data = new Dictionary<int, string>();
data.Add(1, "Hello");
data.Add(2, "World");
lst.ItemsSource = data.Values;
Will display the two strings "Hello" and "World".
Give the ListBox a template:-
<ListBox x:Name="lst">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<TextBlock Text="{Binding Key}" Margin="5" />
<TextBlock Text="{Binding Value}" Margin="5" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Now you can assign the dictionary itself:-
lst.ItemsSource = data;
The listbox displays the set of Key value pairs.
The solution to this problem was very simple: I was not calling InitializeComponent(); before I attempted to bind data to the control.
Related
I have a listbox like this:
<ListBox x:Name="list1" ItemsSource="{Binding MyListWithTuples}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Label Content="{Binding value1}" />
<Label Content="{Binding value2}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
In my view model I have this collection:
private ObservableCollection<(decimal value1, decimal value2)> _myCollection= new ObservableCollection<(decimal value1, decimal value2)>();
public ObservableCollection<(decimal vaule1, decimal value2)> MyCollection
{
get { return _myCollection; }
set
{
_myCollection= value;
base.RaisePropertyChangedEvent("MyCollection");
}
}
But the data isn't show. However if I convert the tuple to a dictionary, I can bind to Key and Value properties and the data is shown. But I would like to avoid to convert the tuple into a dictionary.
Are there some way to bind the listbox to a list of tuples?
Thanks.
Unlike the Tuple Class, the new C# tuple types only define fields, but no properties. So you can't use them with WPF data binding.
However, with
public ObservableCollection<Tuple<decimal, decimal>> MyCollection { get; }
you could use this XAML:
<ListBox ItemsSource="{Binding MyCollection}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Label Content="{Binding Item1}" />
<Label Content="{Binding Item2}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
I created the following list
List<cb> combolist = new List<cb>();
combolist.Add(new cb() { name = "Neo",bloodgroup = "O+ve"});
combolist.Add(new cb() { name = "meo", bloodgroup = "O" });
combolist.Add(new cb() { name = "bsv", bloodgroup = "B+ve" });
cboxnames.ItemsSource = combolist;
Now I am creating a combobox that gets data from the above list using Item template
<ComboBox Margin="12,31,421,258" Name="cboxnames" IsEditable="False">
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding name}"/>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
Now I am creating an additional textblock that displays the item that is selected in the combobox
<TextBlock Height="28" HorizontalAlignment="Left" Background="LightGray" Margin="0,138,0,0" Text="{Binding UpdateSourceTrigger=PropertyChanged,ElementName=cboxnames,Mode=TwoWay,Path=SelectedItem.Content}" VerticalAlignment="Top" Width="191" />
The problem is whenever I am selecting an item from combobox, that item is not displayed in the textblock, please help!!!
<TextBlock Text="{Binding UpdateSourceTrigger=PropertyChanged,
ElementName=cboxnames,
Mode=TwoWay,Path=SelectedItem.name}"/>
use this..hope it helps you
Hi Check your TextBlock Binding . It should be SelectedItem.name instead of SelectedItem.Content
Text="{Binding UpdateSourceTrigger=PropertyChanged,ElementName=cboxnames,Mode=TwoWay,Path=**SelectedItem.name**}"
I hope this will help.
I have a listbox, datagrid and a Button. The data grid is populated with data from MS SQL. I want to be able to copy selected item(s) from the datagrid to listbox using the button. The code behind the button is
private void btnAdd_click(object sender, RoutedEventArgs e)
{
lstSelected.Items.Add(iFacilitiesDataGrid.SelectedItem.ToString());
}
//List Box in xaml
<ListBox Grid.Column="2" Grid.Row="1" Grid.RowSpan="7" Height="258" HorizontalAlignment="Left" Margin="0,4,0,0" Name="lstSelected" VerticalAlignment="Top" Width="236" />
For the datagrid
<DataGrid AutoGenerateColumns="False" EnableRowVirtualization="True" Grid.Column="2" Grid.Row="1" Grid.RowSpan="7" Height="244" HorizontalAlignment="Left" ItemsSource="{Binding Source={StaticResource iLocationICategoriesIFacilitiesViewSource}}" Margin="291,5,0,0" Name="iFacilitiesDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" VerticalAlignment="Top" Width="247">
<DataGrid.Columns>
<DataGridTemplateColumn x:Name="facilityNameColumn" Header="Facility Name" Width="150">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=FacilityName}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn x:Name="priceColumn" Binding="{Binding Path=Price}" Header="Price" Width="100" />
</DataGrid.Columns>
</DataGrid>
Whenever I try to add item on the listbox, the item passed to the listbox is "HM.IFacility" Where HM is the project name and IFacility the Table Name .
If you want the instance of the object to enter the listbox, you cannot control the tostring method like you do:
lstSelected.Items.Add(iFacilitiesDataGrid.SelectedItem.ToString());
Instead, cast your selecteditem to the type:
lstSelected.Items.Add((HM.IFacility)iFacilitiesDataGrid.SelectedItem);
If you don't want the object to enter the listbox, but just some properties from that object, then you have to override the tostring in your object. If you don't do that, the tostring will give you the type of the object, like you said --> "HM.IFacility"
to override the tostring, put this in your object class:
public override string ToString()
{
return property1 + " " + property2
}
Where property1 and property2 are properties on your object class (like name, age, or id)
You need to create a datatemplate for listbox as well. as you have created for DataGrid. replace your listbox with below one and try again.
<ListBox Grid.Column="2" Grid.Row="1" Grid.RowSpan="7" Height="258" HorizontalAlignment="Left" Margin="0,4,0,0" Name="lstSelected" VerticalAlignment="Top" Width="236" >
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=FacilityName}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Condition: The data of DataGrid and ListBox must be same Type.
I have an observablecollection of Images that get populated via the following code:
<StackPanel Orientation="Horizontal" Grid.Column="0">
<ListBox ItemsSource="{Binding BigImageView}" IsSynchronizedWithCurrentItem="True"
SelectedIndex="0" SelectedItem="{Binding CurrentItem}" />
</StackPanel>
<ContentControl Name="Detail" Content="{Binding BigImageView, Mode=OneWay}"
Margin="9,0,0,0" Grid.Column="2" HorizontalAlignment="Left" VerticalAlignment="Top"/>
However the Content Control is supposed to bind to the BigImageView via an ObservableCollection
BigImage = new ObservableCollection<Image>();
_listView = CollectionViewSource.GetDefaultView(BigImage);
_listView.CurrentChanged += new EventHandler(OnCurrentChanged);
public System.ComponentModel.ICollectionView BigImageView
{
get
{
return _listView;
}
set
{
_listView = value;
OnPropertyChanged("BigImageView");
}
}
I want to return the image to the content control when I move the listbox. I have been racking my brain and trying everyhitn but it does not work. any help would be appreciated.
There is no need to bind the selecteditem, the collectionview should take care of that.
Try this:
<ListBox ItemsSource="{Binding BigImageView}" IsSynchronizedWithCurrentItem="True" />
<ContentControl Name="Detail" Content="{Binding BigImageView, Mode=OneWay}" VerticalAlignment="Top">
<ContentControl.ContentTemplate>
<DataTemplate>
<Image Source="{Binding}"/>
</DataTemplate>
<ContentControl.ContentTemplate>
1
Create a viewmodel with a list and a selected item:
public class BigImageViewModel : INotifyPropertyChanged
{
private string bigImage;
//string for path?
public ObservableCollection<string> BigImageView {get; set; } //Of course, make sure it has a value
public string SelectedBigImage
{
get { return bigImage; }
set { bigImage = values; NotifyPropertyChanged("SelectedBigImage"); }
}
}
Set this object on the DataContext of your control in the constructor:
DataContext = new BigImage(); //Make sure you initialize your list
Set the ListBox ItemsSource to your BigImage list, bind your SelectedItem to BigImageView
and use that in your content control:
<ListBox ItemsSource="{Binding BigImageView}" SelectedItem={Binding SelectedBigImage} />
ContentControl:
<ContentControl Name="Detail" Content="{Binding SelectedBigImage, Mode=OneWay}" VerticalAlignment="Top">
<ContentControl.ContentTemplate>
<DataTemplate>
<Image Source="{Binding}"/> <!-- Nice template for showing your string BigImage -->
</DataTemplate>
<ContentControl.ContentTemplate>
</ContentControl>
2
Or screw that view model:
Set the list directly in the constructor (after the InitializeComponent() ):
myListBox.ItemsSource = ObservableCollection<string>(); //Make sure you initialize your list with whatever your object is..
Give the list a name:
And bind with an ElementName binding to your selected item:
<ContentControl Name="Detail" Content="{Binding ElementName=myListBox, Path=SelectedItem}" VerticalAlignment="Top">
<ContentControl.ContentTemplate>
<DataTemplate>
<Image Source="{Binding}"/> <!-- Nice template for showing your string BigImage -->
</DataTemplate>
<ContentControl.ContentTemplate>
</ContentControl>
I'm new to WPF so this may be easier than it seems. I have a DataTable object that I set as the itemssource of a combobox. For each row in the DataTable I want a ComboBoxItem. For each ComboBoxItem I want to create a label for every column name and a text box for the corresponding value, in the current row, of that column. Nothing I try seems to work but heres my shot at the datatemplate in XAML.
<Grid x:Name="LayoutRoot" Background="White" Height="107" Width="358">
<ComboBox Name="pCombo" ItemsSource="myTable">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel DataContext="{Binding pCombo.ItemsSource.Columns}">
<TextBlock Text="{Binding ColumnName}"></TextBlock>
</StackPanel>
<StackPanel DataContext="{Binding pCombo.ItemsSource.Rows}">
<TextBox Text="{Binding RowValue}"></TextBlock>
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
</Grid>
I know all my Bindings are wrong I just can't figure out what should be there instead. Thanks for anyone that helps me out.
XAML:
<ListView ItemsSource="{Binding Path=Tbl}">
<ListView.ItemTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding}">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Label Content="{Binding Path=Key}"></Label>
<Label Content="{Binding Path=Value}"></Label>
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Code behind:
private object tbl = new[]
{
new[] {
new KeyValuePair<string, string>("col1", "val1"), new KeyValuePair<string, string>("col2", "val1")
},
new[] {
new KeyValuePair<string, string>("col1", "val2"), new KeyValuePair<string, string>("col2", "val2")
},
new[] {
new KeyValuePair<string, string>("col1", "val3"), new KeyValuePair<string, string>("col2", "val3")
}
};
public object Tbl { get { return tbl; } set { tbl = value; } }
Don't forget to set the DataContext (i.e. in the .ctor of the window) like this:
DataContext = this;
I just hope you get the idea behind this!