Binding multiple WPF user defined combo boxes to same single Observable collection
0
In my code I have one observable collection that has many combo boxes inside that. Now I have to add List for each combo boxes using MVVM (Model-View-View Model) i.e., No code behind
In View.xaml:
<Window.... xmlns:VM="clr-namespace:myproject.myViewModel"
... >
<Window.DataContext><VM:myViewModel/>
</Window.DataContext>
<ItemsControl ItemsSource="{Binding myCollection}" >
<ItemsControl.ItemTemplate >
<DataTemplate>
<DockPanel>
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid Margin="0,20,0,0" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Text="City" Margin="20" VerticalAlignment="Center"/>
<ComboBox KeyboardNavigation.TabIndex="0" Grid.Column="1" Margin="45,10,10,10" Height="30" Width="200" ItemsSource="{Binding City}" />
<TextBlock Text="temperature" Grid.Row="1" VerticalAlignment="Center" Margin="20" />
<ComboBox KeyboardNavigation.TabIndex="3" Grid.Column="1" Grid.Row="1" Margin="45,20,10,10" Height="30" Width="200" SelectedIndex="0" HorizontalContentAlignment="Right"
VerticalAlignment="Center" ItemsSource="{Binding Temperature}">
</ComboBox>
<TextBlock Text="State" Grid.Row="1" VerticalAlignment="Center" Margin="10" Grid.Column="2"/>
<ComboBox KeyboardNavigation.TabIndex="3" Grid.Column="3" Grid.Row="1" Margin="10" Height="30" Width="200" HorizontalContentAlignment="Center" ItemsSource="{Binding State}" >
</ComboBox>
<TextBlock Text="Open Files " VerticalAlignment="Center" Grid.Row="0" Grid.Column="2" Margin="10" />
<TextBox Grid.Column="3" Text="" Height="30" Grid.Row="0" IsReadOnly="True"
TextAlignment="Right" VerticalContentAlignment="Center" Width="200" /> <Button Grid.Column="4" Content="Browse" Height="30" VerticalAlignment="Bottom" MinWidth="41" />
</Grid>
</Window>
In **Model.cs**:
namespace myproject.Models
{
public class projectmodel : INotifyPropertyChanged
{
private ObservableCollection<projectmodel> city;
private ObservableCollection<projectmodel> temperature;
private ObservableCollection<projectmodel> state;
public ObservableCollection<projectmodel> City
{
get { return city; }
set
{
city = value;
NotifyPropertyChanged("City");
}
}
public ObservableCollection<projectmodel> Temperature
{
get { return temperature; }
set
{
temperature = value;
NotifyPropertyChanged("Temperature");
}
}
public ObservableCollection<projectmodel> State
{
get { return state; }
set
{
state = value;
NotifyPropertyChanged("State");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}}
In ViewModel.cs:
namespace myproject.ViewModels
{
public class projectViewModel
{
public ObservableCollection<T> myCollection
{
get; set;
}
public projectViewModel()
{
myCollection = new ObservableCollection<T>();
List<string> lstCity = new List<string>();
lstCity = new List<string> { "Coimbatore", "Chennai", "Bangalore" };
List<string> lstTemperature = new List<string>();
lstTemperature = new List<string> { "17c", "18c", "15c" };
List<string> lstState = new List<string>();
lstState = new List<string> { "Andhra", "karnataka", "TamilNadu" };
}
}myCollection.Add(new projectmodel
{
City = lstCity.ToArray(),
Temperature = lstTemperature.ToArray(),
State= lstState.ToArray()
});
}
}}
This is my code,I didn't get anything if I select my combo boxes. Please suggest me how should I write my viewmodel.cs ,and also correct me if I'm wrong anywhere else.
c# wpf mvvm
asked Jan 2 at 8:54
GJPDGJPD
196
add a comment |
0
In my code I have one observable collection that has many combo boxes inside that. Now I have to add List for each combo boxes using MVVM (Model-View-View Model) i.e., No code behind
In View.xaml:
<Window.... xmlns:VM="clr-namespace:myproject.myViewModel"
... >
<Window.DataContext><VM:myViewModel/>
</Window.DataContext>
<ItemsControl ItemsSource="{Binding myCollection}" >
<ItemsControl.ItemTemplate >
<DataTemplate>
<DockPanel>
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid Margin="0,20,0,0" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Text="City" Margin="20" VerticalAlignment="Center"/>
<ComboBox KeyboardNavigation.TabIndex="0" Grid.Column="1" Margin="45,10,10,10" Height="30" Width="200" ItemsSource="{Binding City}" />
<TextBlock Text="temperature" Grid.Row="1" VerticalAlignment="Center" Margin="20" />
<ComboBox KeyboardNavigation.TabIndex="3" Grid.Column="1" Grid.Row="1" Margin="45,20,10,10" Height="30" Width="200" SelectedIndex="0" HorizontalContentAlignment="Right"
VerticalAlignment="Center" ItemsSource="{Binding Temperature}">
</ComboBox>
<TextBlock Text="State" Grid.Row="1" VerticalAlignment="Center" Margin="10" Grid.Column="2"/>
<ComboBox KeyboardNavigation.TabIndex="3" Grid.Column="3" Grid.Row="1" Margin="10" Height="30" Width="200" HorizontalContentAlignment="Center" ItemsSource="{Binding State}" >
</ComboBox>
<TextBlock Text="Open Files " VerticalAlignment="Center" Grid.Row="0" Grid.Column="2" Margin="10" />
<TextBox Grid.Column="3" Text="" Height="30" Grid.Row="0" IsReadOnly="True"
TextAlignment="Right" VerticalContentAlignment="Center" Width="200" /> <Button Grid.Column="4" Content="Browse" Height="30" VerticalAlignment="Bottom" MinWidth="41" />
</Grid>
</Window>
In **Model.cs**:
namespace myproject.Models
{
public class projectmodel : INotifyPropertyChanged
{
private ObservableCollection<projectmodel> city;
private ObservableCollection<projectmodel> temperature;
private ObservableCollection<projectmodel> state;
public ObservableCollection<projectmodel> City
{
get { return city; }
set
{
city = value;
NotifyPropertyChanged("City");
}
}
public ObservableCollection<projectmodel> Temperature
{
get { return temperature; }
set
{
temperature = value;
NotifyPropertyChanged("Temperature");
}
}
public ObservableCollection<projectmodel> State
{
get { return state; }
set
{
state = value;
NotifyPropertyChanged("State");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}}
In ViewModel.cs:
namespace myproject.ViewModels
{
public class projectViewModel
{
public ObservableCollection<T> myCollection
{
get; set;
}
public projectViewModel()
{
myCollection = new ObservableCollection<T>();
List<string> lstCity = new List<string>();
lstCity = new List<string> { "Coimbatore", "Chennai", "Bangalore" };
List<string> lstTemperature = new List<string>();
lstTemperature = new List<string> { "17c", "18c", "15c" };
List<string> lstState = new List<string>();
lstState = new List<string> { "Andhra", "karnataka", "TamilNadu" };
}
}myCollection.Add(new projectmodel
{
City = lstCity.ToArray(),
Temperature = lstTemperature.ToArray(),
State= lstState.ToArray()
});
}
}}
This is my code,I didn't get anything if I select my combo boxes. Please suggest me how should I write my viewmodel.cs ,and also correct me if I'm wrong anywhere else.
c# wpf mvvm
asked Jan 2 at 8:54
GJPDGJPD
196
you don't need the visual-studio-2017 tag since you have no questions regarding VS itself.
– T-Me
Jan 2 at 9:10
oh okay sorry...I removed it now.
– GJPD
Jan 2 at 9:26
add a comment |
0
0
0
In my code I have one observable collection that has many combo boxes inside that. Now I have to add List for each combo boxes using MVVM (Model-View-View Model) i.e., No code behind
In View.xaml:
<Window.... xmlns:VM="clr-namespace:myproject.myViewModel"
... >
<Window.DataContext><VM:myViewModel/>
</Window.DataContext>
<ItemsControl ItemsSource="{Binding myCollection}" >
<ItemsControl.ItemTemplate >
<DataTemplate>
<DockPanel>
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid Margin="0,20,0,0" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Text="City" Margin="20" VerticalAlignment="Center"/>
<ComboBox KeyboardNavigation.TabIndex="0" Grid.Column="1" Margin="45,10,10,10" Height="30" Width="200" ItemsSource="{Binding City}" />
<TextBlock Text="temperature" Grid.Row="1" VerticalAlignment="Center" Margin="20" />
<ComboBox KeyboardNavigation.TabIndex="3" Grid.Column="1" Grid.Row="1" Margin="45,20,10,10" Height="30" Width="200" SelectedIndex="0" HorizontalContentAlignment="Right"
VerticalAlignment="Center" ItemsSource="{Binding Temperature}">
</ComboBox>
<TextBlock Text="State" Grid.Row="1" VerticalAlignment="Center" Margin="10" Grid.Column="2"/>
<ComboBox KeyboardNavigation.TabIndex="3" Grid.Column="3" Grid.Row="1" Margin="10" Height="30" Width="200" HorizontalContentAlignment="Center" ItemsSource="{Binding State}" >
</ComboBox>
<TextBlock Text="Open Files " VerticalAlignment="Center" Grid.Row="0" Grid.Column="2" Margin="10" />
<TextBox Grid.Column="3" Text="" Height="30" Grid.Row="0" IsReadOnly="True"
TextAlignment="Right" VerticalContentAlignment="Center" Width="200" /> <Button Grid.Column="4" Content="Browse" Height="30" VerticalAlignment="Bottom" MinWidth="41" />
</Grid>
</Window>
In **Model.cs**:
namespace myproject.Models
{
public class projectmodel : INotifyPropertyChanged
{
private ObservableCollection<projectmodel> city;
private ObservableCollection<projectmodel> temperature;
private ObservableCollection<projectmodel> state;
public ObservableCollection<projectmodel> City
{
get { return city; }
set
{
city = value;
NotifyPropertyChanged("City");
}
}
public ObservableCollection<projectmodel> Temperature
{
get { return temperature; }
set
{
temperature = value;
NotifyPropertyChanged("Temperature");
}
}
public ObservableCollection<projectmodel> State
{
get { return state; }
set
{
state = value;
NotifyPropertyChanged("State");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}}
In ViewModel.cs:
namespace myproject.ViewModels
{
public class projectViewModel
{
public ObservableCollection<T> myCollection
{
get; set;
}
public projectViewModel()
{
myCollection = new ObservableCollection<T>();
List<string> lstCity = new List<string>();
lstCity = new List<string> { "Coimbatore", "Chennai", "Bangalore" };
List<string> lstTemperature = new List<string>();
lstTemperature = new List<string> { "17c", "18c", "15c" };
List<string> lstState = new List<string>();
lstState = new List<string> { "Andhra", "karnataka", "TamilNadu" };
}
}myCollection.Add(new projectmodel
{
City = lstCity.ToArray(),
Temperature = lstTemperature.ToArray(),
State= lstState.ToArray()
});
}
}}
This is my code,I didn't get anything if I select my combo boxes. Please suggest me how should I write my viewmodel.cs ,and also correct me if I'm wrong anywhere else.
c# wpf mvvm
asked Jan 2 at 8:54
GJPDGJPD
196
In my code I have one observable collection that has many combo boxes inside that. Now I have to add List for each combo boxes using MVVM (Model-View-View Model) i.e., No code behind
In View.xaml:
<Window.... xmlns:VM="clr-namespace:myproject.myViewModel"
... >
<Window.DataContext><VM:myViewModel/>
</Window.DataContext>
<ItemsControl ItemsSource="{Binding myCollection}" >
<ItemsControl.ItemTemplate >
<DataTemplate>
<DockPanel>
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid Margin="0,20,0,0" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Text="City" Margin="20" VerticalAlignment="Center"/>
<ComboBox KeyboardNavigation.TabIndex="0" Grid.Column="1" Margin="45,10,10,10" Height="30" Width="200" ItemsSource="{Binding City}" />
<TextBlock Text="temperature" Grid.Row="1" VerticalAlignment="Center" Margin="20" />
<ComboBox KeyboardNavigation.TabIndex="3" Grid.Column="1" Grid.Row="1" Margin="45,20,10,10" Height="30" Width="200" SelectedIndex="0" HorizontalContentAlignment="Right"
VerticalAlignment="Center" ItemsSource="{Binding Temperature}">
</ComboBox>
<TextBlock Text="State" Grid.Row="1" VerticalAlignment="Center" Margin="10" Grid.Column="2"/>
<ComboBox KeyboardNavigation.TabIndex="3" Grid.Column="3" Grid.Row="1" Margin="10" Height="30" Width="200" HorizontalContentAlignment="Center" ItemsSource="{Binding State}" >
</ComboBox>
<TextBlock Text="Open Files " VerticalAlignment="Center" Grid.Row="0" Grid.Column="2" Margin="10" />
<TextBox Grid.Column="3" Text="" Height="30" Grid.Row="0" IsReadOnly="True"
TextAlignment="Right" VerticalContentAlignment="Center" Width="200" /> <Button Grid.Column="4" Content="Browse" Height="30" VerticalAlignment="Bottom" MinWidth="41" />
</Grid>
</Window>
In **Model.cs**:
namespace myproject.Models
{
public class projectmodel : INotifyPropertyChanged
{
private ObservableCollection<projectmodel> city;
private ObservableCollection<projectmodel> temperature;
private ObservableCollection<projectmodel> state;
public ObservableCollection<projectmodel> City
{
get { return city; }
set
{
city = value;
NotifyPropertyChanged("City");
}
}
public ObservableCollection<projectmodel> Temperature
{
get { return temperature; }
set
{
temperature = value;
NotifyPropertyChanged("Temperature");
}
}
public ObservableCollection<projectmodel> State
{
get { return state; }
set
{
state = value;
NotifyPropertyChanged("State");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}}
In ViewModel.cs:
namespace myproject.ViewModels
{
public class projectViewModel
{
public ObservableCollection<T> myCollection
{
get; set;
}
public projectViewModel()
{
myCollection = new ObservableCollection<T>();
List<string> lstCity = new List<string>();
lstCity = new List<string> { "Coimbatore", "Chennai", "Bangalore" };
List<string> lstTemperature = new List<string>();
lstTemperature = new List<string> { "17c", "18c", "15c" };
List<string> lstState = new List<string>();
lstState = new List<string> { "Andhra", "karnataka", "TamilNadu" };
}
}myCollection.Add(new projectmodel
{
City = lstCity.ToArray(),
Temperature = lstTemperature.ToArray(),
State= lstState.ToArray()
});
}
}}
This is my code,I didn't get anything if I select my combo boxes. Please suggest me how should I write my viewmodel.cs ,and also correct me if I'm wrong anywhere else.
c# wpf mvvm
c# wpf mvvm
asked Jan 2 at 8:54
GJPDGJPD
196
asked Jan 2 at 8:54
GJPDGJPD
196
edited Jan 2 at 13:44
GJPD
asked Jan 2 at 8:54
GJPDGJPD
196
asked Jan 2 at 8:54
GJPDGJPD
196
asked Jan 2 at 8:54
GJPDGJPD
196
196
you don't need the visual-studio-2017 tag since you have no questions regarding VS itself.
– T-Me
Jan 2 at 9:10
oh okay sorry...I removed it now.
– GJPD
Jan 2 at 9:26
add a comment |
you don't need the visual-studio-2017 tag since you have no questions regarding VS itself.
– T-Me
Jan 2 at 9:10
oh okay sorry...I removed it now.
– GJPD
Jan 2 at 9:26
you don't need the visual-studio-2017 tag since you have no questions regarding VS itself.
– T-Me
Jan 2 at 9:10
you don't need the visual-studio-2017 tag since you have no questions regarding VS itself.
– T-Me
Jan 2 at 9:10
oh okay sorry...I removed it now.
– GJPD
Jan 2 at 9:26
oh okay sorry...I removed it now.
– GJPD
Jan 2 at 9:26
add a comment |
1 Answer
1
active
oldest
votes
0
You have to declare all your collections inside your projectmodel to be of type ObservableCollection<string> instead of sting. When ever you bind to a collection use ObservableCollection<T>.
Your view models must also all implement INotifyPropertyChanged
Changes:
ProjectModel:
namespace Myproject.Models
{
public class ProjectModel : INotifyPropertyChanged
{
private ObservableCollection<string> city;
private ObservableCollection<string> temperature;
private ObservableCollection<string> state;
public ObservableCollection<string> City
{
get { return city; }
set
{
city = value;
NotifyPropertyChanged("City");
}
}
public ObservableCollection<string> Temperature
{
get { return temperature; }
set
{
temperature = value;
NotifyPropertyChanged("Temperature");
}
}
public ObservableCollection<string> State
{
get { return state; }
set
{
state = value;
NotifyPropertyChanged("State");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
ProjectViewModel:
namespace MyProject.ViewModels
{
public class ProjectViewModel : INotifyPropertyChanged
{
private ObservableCollection<Projectmodel> myCollection;
public ObservableCollection<Projectmodel> MyCollection
{
get => this.myCollection;
set
{
if (Equals(value, this.myCollection)) return;
this.myCollection = value;
OnPropertyChanged();
}
}
public ProjectViewModel()
{
MyCollection = new ObservableCollection<Projectmodel>()
{
new ProjectModel()
{
City = new ObservableCollection<string>()
{
"Coimbatore", "Chennai", "Bangalore"
},
Temperature = new ObservableCollection<string>()
{
"17c", "18c", "15c"
},
State = new ObservableCollection<string>()
{
"Andhra", "karnataka", "TamilNadu"
}
}
};
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Edit:
I updated the code to meet the common naming conventions using PascalCase. It is recommended to follow them: C# Conventions
answered Jan 2 at 9:12
MacPowderMacPowder
1005
u mean like this....please look over my code once again which I have edited
– GJPD
Jan 2 at 9:24
No. Please check the code in my updated answer.
– MacPowder
Jan 2 at 9:37
but changing ObservableCollection<T> instead ObservableCollection<projectmodel> , is showing an error
– GJPD
Jan 2 at 9:39
Sorry, my crystal ball is broken. What error? Just copy my code and try. It must be 'ObservableCollection<string>' I told you and showed you.
– MacPowder
Jan 2 at 9:41
Thank you so much . I will try and let u know
– GJPD
Jan 2 at 9:45
|
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
You have to declare all your collections inside your projectmodel to be of type ObservableCollection<string> instead of sting. When ever you bind to a collection use ObservableCollection<T>.
Your view models must also all implement INotifyPropertyChanged
Changes:
ProjectModel:
namespace Myproject.Models
{
public class ProjectModel : INotifyPropertyChanged
{
private ObservableCollection<string> city;
private ObservableCollection<string> temperature;
private ObservableCollection<string> state;
public ObservableCollection<string> City
{
get { return city; }
set
{
city = value;
NotifyPropertyChanged("City");
}
}
public ObservableCollection<string> Temperature
{
get { return temperature; }
set
{
temperature = value;
NotifyPropertyChanged("Temperature");
}
}
public ObservableCollection<string> State
{
get { return state; }
set
{
state = value;
NotifyPropertyChanged("State");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
ProjectViewModel:
namespace MyProject.ViewModels
{
public class ProjectViewModel : INotifyPropertyChanged
{
private ObservableCollection<Projectmodel> myCollection;
public ObservableCollection<Projectmodel> MyCollection
{
get => this.myCollection;
set
{
if (Equals(value, this.myCollection)) return;
this.myCollection = value;
OnPropertyChanged();
}
}
public ProjectViewModel()
{
MyCollection = new ObservableCollection<Projectmodel>()
{
new ProjectModel()
{
City = new ObservableCollection<string>()
{
"Coimbatore", "Chennai", "Bangalore"
},
Temperature = new ObservableCollection<string>()
{
"17c", "18c", "15c"
},
State = new ObservableCollection<string>()
{
"Andhra", "karnataka", "TamilNadu"
}
}
};
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Edit:
I updated the code to meet the common naming conventions using PascalCase. It is recommended to follow them: C# Conventions
answered Jan 2 at 9:12
MacPowderMacPowder
1005
u mean like this....please look over my code once again which I have edited
– GJPD
Jan 2 at 9:24
No. Please check the code in my updated answer.
– MacPowder
Jan 2 at 9:37
but changing ObservableCollection<T> instead ObservableCollection<projectmodel> , is showing an error
– GJPD
Jan 2 at 9:39
Sorry, my crystal ball is broken. What error? Just copy my code and try. It must be 'ObservableCollection<string>' I told you and showed you.
– MacPowder
Jan 2 at 9:41
Thank you so much . I will try and let u know
– GJPD
Jan 2 at 9:45
|
show 10 more comments
0
You have to declare all your collections inside your projectmodel to be of type ObservableCollection<string> instead of sting. When ever you bind to a collection use ObservableCollection<T>.
Your view models must also all implement INotifyPropertyChanged
Changes:
ProjectModel:
namespace Myproject.Models
{
public class ProjectModel : INotifyPropertyChanged
{
private ObservableCollection<string> city;
private ObservableCollection<string> temperature;
private ObservableCollection<string> state;
public ObservableCollection<string> City
{
get { return city; }
set
{
city = value;
NotifyPropertyChanged("City");
}
}
public ObservableCollection<string> Temperature
{
get { return temperature; }
set
{
temperature = value;
NotifyPropertyChanged("Temperature");
}
}
public ObservableCollection<string> State
{
get { return state; }
set
{
state = value;
NotifyPropertyChanged("State");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
ProjectViewModel:
namespace MyProject.ViewModels
{
public class ProjectViewModel : INotifyPropertyChanged
{
private ObservableCollection<Projectmodel> myCollection;
public ObservableCollection<Projectmodel> MyCollection
{
get => this.myCollection;
set
{
if (Equals(value, this.myCollection)) return;
this.myCollection = value;
OnPropertyChanged();
}
}
public ProjectViewModel()
{
MyCollection = new ObservableCollection<Projectmodel>()
{
new ProjectModel()
{
City = new ObservableCollection<string>()
{
"Coimbatore", "Chennai", "Bangalore"
},
Temperature = new ObservableCollection<string>()
{
"17c", "18c", "15c"
},
State = new ObservableCollection<string>()
{
"Andhra", "karnataka", "TamilNadu"
}
}
};
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Edit:
I updated the code to meet the common naming conventions using PascalCase. It is recommended to follow them: C# Conventions
answered Jan 2 at 9:12
MacPowderMacPowder
1005
u mean like this....please look over my code once again which I have edited
– GJPD
Jan 2 at 9:24
No. Please check the code in my updated answer.
– MacPowder
Jan 2 at 9:37
but changing ObservableCollection<T> instead ObservableCollection<projectmodel> , is showing an error
– GJPD
Jan 2 at 9:39
Sorry, my crystal ball is broken. What error? Just copy my code and try. It must be 'ObservableCollection<string>' I told you and showed you.
– MacPowder
Jan 2 at 9:41
Thank you so much . I will try and let u know
– GJPD
Jan 2 at 9:45
|
show 10 more comments
0
0
0
You have to declare all your collections inside your projectmodel to be of type ObservableCollection<string> instead of sting. When ever you bind to a collection use ObservableCollection<T>.
Your view models must also all implement INotifyPropertyChanged
Changes:
ProjectModel:
namespace Myproject.Models
{
public class ProjectModel : INotifyPropertyChanged
{
private ObservableCollection<string> city;
private ObservableCollection<string> temperature;
private ObservableCollection<string> state;
public ObservableCollection<string> City
{
get { return city; }
set
{
city = value;
NotifyPropertyChanged("City");
}
}
public ObservableCollection<string> Temperature
{
get { return temperature; }
set
{
temperature = value;
NotifyPropertyChanged("Temperature");
}
}
public ObservableCollection<string> State
{
get { return state; }
set
{
state = value;
NotifyPropertyChanged("State");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
ProjectViewModel:
namespace MyProject.ViewModels
{
public class ProjectViewModel : INotifyPropertyChanged
{
private ObservableCollection<Projectmodel> myCollection;
public ObservableCollection<Projectmodel> MyCollection
{
get => this.myCollection;
set
{
if (Equals(value, this.myCollection)) return;
this.myCollection = value;
OnPropertyChanged();
}
}
public ProjectViewModel()
{
MyCollection = new ObservableCollection<Projectmodel>()
{
new ProjectModel()
{
City = new ObservableCollection<string>()
{
"Coimbatore", "Chennai", "Bangalore"
},
Temperature = new ObservableCollection<string>()
{
"17c", "18c", "15c"
},
State = new ObservableCollection<string>()
{
"Andhra", "karnataka", "TamilNadu"
}
}
};
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Edit:
I updated the code to meet the common naming conventions using PascalCase. It is recommended to follow them: C# Conventions
answered Jan 2 at 9:12
MacPowderMacPowder
1005
You have to declare all your collections inside your projectmodel to be of type ObservableCollection<string> instead of sting. When ever you bind to a collection use ObservableCollection<T>.
Your view models must also all implement INotifyPropertyChanged
Changes:
ProjectModel:
namespace Myproject.Models
{
public class ProjectModel : INotifyPropertyChanged
{
private ObservableCollection<string> city;
private ObservableCollection<string> temperature;
private ObservableCollection<string> state;
public ObservableCollection<string> City
{
get { return city; }
set
{
city = value;
NotifyPropertyChanged("City");
}
}
public ObservableCollection<string> Temperature
{
get { return temperature; }
set
{
temperature = value;
NotifyPropertyChanged("Temperature");
}
}
public ObservableCollection<string> State
{
get { return state; }
set
{
state = value;
NotifyPropertyChanged("State");
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Private Helpers
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
ProjectViewModel:
namespace MyProject.ViewModels
{
public class ProjectViewModel : INotifyPropertyChanged
{
private ObservableCollection<Projectmodel> myCollection;
public ObservableCollection<Projectmodel> MyCollection
{
get => this.myCollection;
set
{
if (Equals(value, this.myCollection)) return;
this.myCollection = value;
OnPropertyChanged();
}
}
public ProjectViewModel()
{
MyCollection = new ObservableCollection<Projectmodel>()
{
new ProjectModel()
{
City = new ObservableCollection<string>()
{
"Coimbatore", "Chennai", "Bangalore"
},
Temperature = new ObservableCollection<string>()
{
"17c", "18c", "15c"
},
State = new ObservableCollection<string>()
{
"Andhra", "karnataka", "TamilNadu"
}
}
};
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Edit:
I updated the code to meet the common naming conventions using PascalCase. It is recommended to follow them: C# Conventions
answered Jan 2 at 9:12
MacPowderMacPowder
1005
edited Jan 2 at 14:50
answered Jan 2 at 9:12
MacPowderMacPowder
1005
answered Jan 2 at 9:12
MacPowderMacPowder
1005
answered Jan 2 at 9:12
MacPowderMacPowder
1005
1005
u mean like this....please look over my code once again which I have edited
– GJPD
Jan 2 at 9:24
No. Please check the code in my updated answer.
– MacPowder
Jan 2 at 9:37
but changing ObservableCollection<T> instead ObservableCollection<projectmodel> , is showing an error
– GJPD
Jan 2 at 9:39
Sorry, my crystal ball is broken. What error? Just copy my code and try. It must be 'ObservableCollection<string>' I told you and showed you.
– MacPowder
Jan 2 at 9:41
Thank you so much . I will try and let u know
– GJPD
Jan 2 at 9:45
|
show 10 more comments
u mean like this....please look over my code once again which I have edited
– GJPD
Jan 2 at 9:24
No. Please check the code in my updated answer.
– MacPowder
Jan 2 at 9:37
but changing ObservableCollection<T> instead ObservableCollection<projectmodel> , is showing an error
– GJPD
Jan 2 at 9:39
Sorry, my crystal ball is broken. What error? Just copy my code and try. It must be 'ObservableCollection<string>' I told you and showed you.
– MacPowder
Jan 2 at 9:41
Thank you so much . I will try and let u know
– GJPD
Jan 2 at 9:45
u mean like this....please look over my code once again which I have edited
– GJPD
Jan 2 at 9:24
u mean like this....please look over my code once again which I have edited
– GJPD
Jan 2 at 9:24
No. Please check the code in my updated answer.
– MacPowder
Jan 2 at 9:37
No. Please check the code in my updated answer.
– MacPowder
Jan 2 at 9:37
but changing ObservableCollection<T> instead ObservableCollection<projectmodel> , is showing an error
– GJPD
Jan 2 at 9:39
but changing ObservableCollection<T> instead ObservableCollection<projectmodel> , is showing an error
– GJPD
Jan 2 at 9:39
Sorry, my crystal ball is broken. What error? Just copy my code and try. It must be 'ObservableCollection<string>' I told you and showed you.
– MacPowder
Jan 2 at 9:41
Sorry, my crystal ball is broken. What error? Just copy my code and try. It must be 'ObservableCollection<string>' I told you and showed you.
– MacPowder
Jan 2 at 9:41
Thank you so much . I will try and let u know
– GJPD
Jan 2 at 9:45
Thank you so much . I will try and let u know
– GJPD
Jan 2 at 9:45
|
show 10 more comments
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you don't need the visual-studio-2017 tag since you have no questions regarding VS itself.
– T-Me
Jan 2 at 9:10
oh okay sorry...I removed it now.
– GJPD
Jan 2 at 9:26