Hi
I created a master details scenario where a row selected from the datagrid(Master) is displayed in the detail section. The detail section has few combo boxes and textboxes. When I made changes in the details section, I could see the changes get reflected from textbox to data grid but not from combo box. I tried several way like datacontext,selecteditem and changed bindings unsuccessfully. Any solutions/approaches are highly appreciated.(Below is the sample code).
------------------------------------------------------------MainPage.xaml----------------------------------------------
<UserControl x:Class="ComboBoxPractice.MainPage"
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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
<StackPanel Width="600" Height="600">
<data:DataGrid Name="dtgdMaster" SelectionChanged="DataGrid_SelectionChanged" Width="500" Height="300">
</data:DataGrid>
<Grid Name="grdDetail">
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="150"></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text=" Id:" Margin="10"></TextBlock>
<TextBox Name="txtId" Text="{Binding Path=id,Mode=TwoWay}" Grid.Row="0" Grid.Column="1" Margin="10" HorizontalAlignment="Left" ></TextBox>
<TextBlock Grid.Row="1" Grid.Column="0" Text="Step:" Margin="10"></TextBlock>
<ComboBox Name="cboStep" Grid.Row="1" Grid.Column="1" Margin="10" HorizontalAlignment="Left" SelectedItem="{Binding Path=step,Mode=TwoWay}"></ComboBox>
<TextBlock Grid.Row="2" Grid.Column="0" Text="Name:" Margin="10"></TextBlock>
<ComboBox Name="cboName" Grid.Row="2" Grid.Column="1" Margin="10" HorizontalAlignment="Left" SelectedItem="{Binding Path=name,Mode=TwoWay}"></ComboBox>
</Grid>
</StackPanel>
</UserControl>
----------------------------------------------------------MainPage.xaml.cs-------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.ComponentModel;
using System.Collections.ObjectModel;
namespace ComboBoxPractice
{
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
Loaded += new RoutedEventHandler(MainPage_Loaded);
}
ObservableCollection<Employee> Employees;
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
Employees = new ObservableCollection<Employee>{
new Employee{id="1",name="n1",step="s1"},
new Employee{id="2",name="n2",step="s2"},
new Employee{id="3",name="n3",step="s3"},
new Employee{id="4",name="n4",step="s4"}
};
dtgdMaster.ItemsSource = Employees;
cboName.ItemsSource = Employees;
cboName.DisplayMemberPath = "name";
cboName.DataContext = selectedEmployee;
cboStep.ItemsSource = Employees;
cboStep.DisplayMemberPath = "step";
cboName.DataContext = selectedEmployee;
}
Employee selectedEmployee;
private void DataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
object selectedEmployeeObject = (sender as DataGrid).SelectedItem;
selectedEmployee = (Employee)selectedEmployeeObject;
txtId.DataContext = selectedEmployee;
cboName.SelectedItem = selectedEmployee;
cboStep.SelectedItem = selectedEmployee;
}
}
public class Employee:INotifyPropertyChanged
{
private string _id;
private string _name;
private string _step;
public string id
{
set
{
_id = value;
OnPropertyChanged("id");
}
get
{
return _id;
}
}
public string name
{
set
{
_name = value;
OnPropertyChanged("name");
}
get
{
return _name;
}
}
public string step
{
set
{
_step = value;
OnPropertyChanged("step");
}
get
{
return _step;
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string parameterName)
{
if (this.PropertyChanged != null)
{
PropertyChanged(this,new PropertyChangedEventArgs(parameterName));
}
}
#endregion
}
}
------------------------------------------------------------------------
Thank You
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