Using Update button in WPF ListView to update Selected Item
Question
I have to make a WPF App to add, delete and update Items for Client Management purposes. I have so far been able to add and remove the items to the List using MVVM but I am unable to update the selected items. I require help in this regard. The code for the project is as follows:
Details Class.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Assignment_2.Model
{
public class Details :INotifyPropertyChanged
{
private string name;
public string Name
{ get { return name; } set { name = value; OnPropertyChanged(Name); } }
private string company;
public string Company
{ get { return company; } set { company = value; OnPropertyChanged(Company); } }
private string region;
public string Region
{ get { return region; } set { region = value; OnPropertyChanged(Region); } }
private string hra;
public string HRA
{
get { return hra; }
set
{
hra = value;
OnPropertyChanged(HRA);
}
}
private string basic;
public string Basic
{ get { return basic; }
set { basic = value;
OnPropertyChanged(Basic);
}
}
private string pf;
public string PF
{ get { return pf; }
set
{
pf = value;
OnPropertyChanged(PF);
}
}
private string salary;
public string Salary
{ get { return salary; }
set
{
salary = value;
OnPropertyChanged(Salary);
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string det)
{
PropertyChangedEventHandler pc = PropertyChanged;
if (pc != null)
pc(this, new PropertyChangedEventArgs(det));
}
}
}
DetailsViewModel.cs
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using Assignment_2.Commands;
using Assignment_2.Model;
namespace Assignment_2.ViewModel
{
public class DetailsViewModel : INotifyPropertyChanged
{
private Details record;
public Details Record
{
get { return record; }
set { record = value; NotifyPropertyChanged("Record"); }
}
private ObservableCollection<Details> records;
public ObservableCollection<Details> Records
{
get { return records; }
set { records = value; } // NotifyPropertyChanged("Records");
}
private ICommand _SubmitCommand;
public ICommand SubmitCommand
{
get
{
if (_SubmitCommand == null)
{
_SubmitCommand = new RelayCommand(SubmitExecute, CanSubmitExecute, false);
}
return _SubmitCommand;
}
}
public DetailsViewModel()
{
Record = new Details();
Records = new ObservableCollection<Details>();
}
private void SubmitExecute(object parameter)
{
var TempRecord = new Details();
//TempRecord = Record;
TempRecord.Name = Record.Name;
TempRecord.Company = Record.Company;
TempRecord.Region = Record.Region;
TempRecord.HRA = Record.HRA;
TempRecord.Salary = Record.Salary;
TempRecord.Basic = Record.Basic;
TempRecord.PF = Record.PF;
Records.Add(TempRecord);
}
private bool CanSubmitExecute(object parameter)
{
if (string.IsNullOrEmpty(Record.Name) || string.IsNullOrEmpty(Record.Company))
{
return false;
}
else
{
return true;
}
}
private ICommand _SubmitCommand1;
public ICommand SubmitCommand1
{
get
{
if (_SubmitCommand1 == null)
{
_SubmitCommand1 = new RelayCommand(SubmitExecute1, CanSubmitExecute1, false);
}
return _SubmitCommand1;
}
}
public int findIndex(Details myDetails)
{
int count = 0;
for (int i = 0; i < Records.Count; i++)
{
count = 0;
Details myRecord = Records[i];
if (myRecord.Name == myDetails.Name)
count++;
else continue;
if (myRecord.Company == myDetails.Company)
count++;
else continue;
if (myRecord.Region == myDetails.Region)
count++;
else continue;
if (myRecord.Salary == myDetails.Salary)
count++;
else continue;
if (myRecord.HRA == myDetails.HRA)
count++;
else continue;
if (myRecord.Basic == myDetails.Basic)
count++;
else continue;
if (myRecord.PF == myDetails.PF)
count++;
else continue;
if (count == 7)
return i;
}
return -1;
}
private void SubmitExecute1(object parameter)
{
Records.Remove((Details)parameter);
}
private bool CanSubmitExecute1(object parameter)
{
if (string.IsNullOrEmpty(Record.Name) || string.IsNullOrEmpty(Record.Company))
{
return false;
}
else
{
return true;
}
}
private ICommand _SubmitCommand2;
public ICommand SubmitCommand2
{
get
{
if (_SubmitCommand2 == null)
{
_SubmitCommand2 = new RelayCommand(SubmitExecute2, CanSubmitExecute2, false);
}
return _SubmitCommand2;
}
}
private void SubmitExecute2(object parameter)
{
}
private bool CanSubmitExecute2(object parameter)
{
if (string.IsNullOrEmpty(Record.Name) || string.IsNullOrEmpty(Record.Company))
{
return false;
}
else
{
return true;
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void NotifyPropertyChanged(string de)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(de));
}
}
}
RelayCommand.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
namespace Assignment_2.Commands
{
class RelayCommand : ICommand
{
Action<object> executeAction;
Func<object, bool> canExecute;
bool canExecuteCache;
public RelayCommand(Action<object> executeAction, Func<object, bool> canExecute, bool canExecuteCache)
{
this.canExecute = canExecute;
this.executeAction = executeAction;
canExecuteCache = canExecuteCache;
}
public bool CanExecute(object parameter)
{
if (canExecute == null)
{
return true;
}
else
{
return canExecute(parameter);
}
}
public event EventHandler CanExecuteChanged
{
add
{
CommandManager.RequerySuggested += value;
}
remove
{
CommandManager.RequerySuggested -= value;
}
}
public void Execute(object parameter)
{
executeAction(parameter);
}
}
}
MainWindow.xaml
<Window x:Class="Assignment_2.MainWindow"
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:vm="clr-namespace:Assignment_2.ViewModel"
Title="MainWindow" Height="401" Width="472">
<Window.Resources>
<vm:DetailsViewModel x:Key="DetailsViewModel"/>
</Window.Resources>
<Grid DataContext="{Binding Source={StaticResource DetailsViewModel}}" RenderTransformOrigin="0.5,0.5" Margin="0,0,1,1">
<Grid.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform Angle="-0.21"/>
<TranslateTransform/>
</TransformGroup>
</Grid.RenderTransform>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="20.59"/>
<RowDefinition Height="22.906"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="29*"/>
<RowDefinition Height="293*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Text=" Name" HorizontalAlignment="Center" Margin="0,0,0,4" Grid.RowSpan="2" Width="35" />
<TextBox Grid.Column="1" Width="100" HorizontalAlignment="Left" Text="{Binding Record.Name,UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" Margin="2,0,0,1" Grid.RowSpan="2"/>
<TextBlock Text="Company" HorizontalAlignment="Center" Margin="0,2,0,3" Width="51" Grid.RowSpan="2" Grid.Row="1"/>
<TextBox Grid.Column="1" Width="100" HorizontalAlignment="Left" Text="{Binding Record.Company,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" Margin="2,2,0,1" Grid.Row="1"/>
<TextBlock Grid.Row="2" Text="Region" HorizontalAlignment="Center" Margin="0,1,0,4" Width="37"/>
<TextBox Grid.Row="2" Grid.Column="1" Width="100" HorizontalAlignment="Left" Text="{Binding Record.Region,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" Margin="3,1,0,4"/>
<TextBlock Grid.Column="1" Text="HRA" HorizontalAlignment="Left" Margin="131,-1,0,2" Width="23"/>
<TextBox Grid.Column="1" Width="83" HorizontalAlignment="Left" Text="{Binding Record.HRA,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" Margin="162,0,0,1"/>
<TextBlock Grid.Column="1" Text="Basic" HorizontalAlignment="Left" Margin="129,2,0,13" Width="26" Grid.RowSpan="2" Grid.Row="1"/>
<TextBox Grid.Column="1" Width="81" HorizontalAlignment="Left" Text="{Binding Record.Basic,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" Margin="162,2,0,3" Grid.Row="1"/>
<TextBlock Grid.Row="2" Grid.Column="1" Text="PF" HorizontalAlignment="Left" Margin="144,1,0,5" Width="12"/>
<TextBox Grid.Row="2" Grid.Column="1" Width="100" HorizontalAlignment="Left" Text="{Binding Record.PF,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" Margin="162,2,0,1"/>
<TextBlock Grid.Column="1" Text="Salary" HorizontalAlignment="Left" Margin="268,-1,0,1" Width="36"/>
<TextBox Grid.Column="1" Width="100" HorizontalAlignment="Left" Text="{Binding Record.Salary,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" Margin="304,0,0,21" Grid.RowSpan="2"/>
<Button Content="Add" Command="{Binding SubmitCommand }" HorizontalAlignment="Left" Grid.Row="4" Margin="121,4,0,5" Width="44" Grid.Column="1"/>
<ListView x:Name="ListedView" ItemsSource="{Binding Records}" Width="Auto" Grid.Row="5" Margin="38,3,13,36" Grid.ColumnSpan="2">
<ListView.View >
<GridView >
<GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" Width="Auto" />
<GridViewColumn Header="Company" DisplayMemberBinding="{Binding Company}" Width="Auto"/>
<GridViewColumn Header="Region" DisplayMemberBinding="{Binding Region}" Width="Auto" />
<GridViewColumn Header="HRA" DisplayMemberBinding="{Binding HRA}" Width="Auto" />
<GridViewColumn Header="Basic" DisplayMemberBinding="{Binding Basic}" Width="Auto" />
<GridViewColumn Header="PF" DisplayMemberBinding="{Binding PF}" Width="Auto" />
<GridViewColumn Header="Salary" DisplayMemberBinding="{Binding Salary}" Width="Auto" />
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button Content="Remove" Margin="1,36,50,150" Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=ListView},Path=DataContext.SubmitCommand1}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</Grid>
</Window>
Any help is appreciated in this regard. Thanks
2 answers
solution1
0 2022-01-27 18:22:42
If I understand your issue correctly, you should bind the SelectedItem property of the ListView to be able to edit the currently selected item in the TextBox elements above the ListView :
<ListView SelectedItem="{Binding Record}" ... />
solution2
0 2022-01-28 15:35:55
With or without Binding you can do it like this:
if ((sender as ListView).SelectedValue != null)
{
string item = (sender as ListView).SelectedValue.ToString();
SelectedIndex = (sender as ListView).SelectedIndex;
list.Items[SelectedIndex] = "Updated";
}
(I like to add a ContextMenu on my ListViewItems so it is easier for users to modify the specified clicked item):
<ListView x:Name="list">
<ListView.ContextMenu>
<ContextMenu x:Name="contextmenu">
<MenuItem x:Name="Add" Header="Add" Click="Add_Click"/>
<MenuItem x:Name="Del" Header="Delete" Click="Del_Click"/>
<MenuItem x:Name="Update" Header="Update" Click="Update_Click"/>
</ContextMenu>
</ListView.ContextMenu>
</ListView>
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