How to add value in textbox when button clicked add selecteditem value selected from combobox

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C#

 private List<ListItem>  _tyreList;
public List<ListItem> TyreList;
{
  get
    {
                return _tyre;
     }
    set
      {
                _tyre= value;
                RaisePropertyChanged();
      }
}

<ComboBox Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="1"  SelectedValuePath="Value" DisplayMemberPath="Name" ItemsSource="{Binding ElementName=LayoutRoot, Path=DataContext.TyreList}" SelectedItem="{Binding TyreList}"/>

                                        
<Button Command="{Binding AddTyreCommand}" Grid.Row="3" Grid.Column="4" Grid.ColumnSpan="2" Content="Add Tyre"  Width="150" Height="25" HorizontalAlignment="Left" />
                                        
<TextBox  Name="tbMultiLine"  TextWrapping="Wrap"  AcceptsReturn="True"  VerticalScrollBarVisibility="Visible" Text="{Binding what binding to set here => TyreList}" />

What I have tried:

C#

private RelayCommand _addTyreCommand;
public RelayCommand AddTyreCommand => _addTyreCommand?? (_addTyreCommand= new RelayCommand(AddTyres , CanAddTyres));
   
private void AddTyres ()
{
//something here

 }      

 private bool CanAddTyres() => true;//to add tyres

Posted 11-Nov-18 13:33pm

JimB_

Updated 11-Nov-18 18:59pm

v2

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M.Kamran Asim · Accepted Answer · 2018-11-11T19:00:00

OK
First
Create a public ListItem property and Bind it to TextBox

C#

public ListItem SelectedItem 
{
  get=>selectedItem;
  set
     {
      selectedItem=value;
      RaisePropertyChange();
     }
}

HTML

<TextBox Text = "{Binding SelectedItem, UpdateSourceTrigger=PropertyChanged}"/>

Second use RelayCommand which accepts command parameter like

C#

RelayCommand<object> AddtyreCommand=> -----new RelayCommand(Addtyres)
where 
private void AddTyres(object item)
{
   SelectedItem  = item as ListItem;
.......
}

Third set Name to combobox and In Button Define CommandParameter

HTML

<Button .... CommandParameter="{Binding ElementName=comboTyreList, Path=SelectedItem" />

Thats it. You are done.
Sorry for inappropriate formatting and code.