This document provides resources and information for learning C# WPF MVVM. It includes a list of recommended books on C#, WPF, and software design practices. It also covers key concepts in WPF and MVVM like data binding, commands, events, inheritance, interfaces and data validation. Code examples are provided for common patterns in WPF MVVM development including properties, commands, notifications and separating view, viewmodel and model layers.

1. C# WPF MVVM
Мария Нащанская
ведущий программист
Неолант

2. «Художественная»
Литература
«Совершенный код» Стив Макконнелл
«Deadline. Роман об управлении проектами» Том ДеМарко
C#
Джеффри Рихтер «CLR via C#»
«Программирование на платформе Microsoft.NET Framework 4.5 на языке C#»
Эндрю Троелсен «Язык программирования C# 5.0 и платформа .NET 4.5»
WPF
Адам Натан «WPF 4. Unleashed» (Подробное руководство)
Мэтью Макдональд

3. Другие материалы
msdn.microsoft.com
Google :)

4. С#
public class Person: BaseClass, IClonable, ICommand
{
private static const cUni = «BFU»;
!
/
/свойство
private string mName;
public string Name
{
get { return mName; }
set { mName = value; }
}
}
/
/свойство
public string Surname { get; set;}

5. Наследование
!
public abstract class Animal
{
public virtual int LegsCount()
{
return 4;
}
public class Human: Animal
{
public override int LegsCount()
{
return 2;
}
!
!
public override string Say()
{
return «Hello»;
}
public abstract string Say();
}
}
Human john = new Human();
string firstWord = john.Say();
Animal someone = john;
int legsCount = john.LegsCount();

6. Интерфейсы
public interface ICommand
{
string CommandName
{
get;
}
public class MyCommand: ICommand
{
public string CommandName
{
get { return «MyFirstCommand»; }
}
!
public void Execute()
{
Console.Writeln(«HelloWorld»):
}
void Execute;
}
}
List<ICommand> commands = OurSmartClass.GetCommands();
foreach (var command in commands)
{
command.Execute();
}

7. События и делегаты
public class SmartClass
{
public delegate void Action (string option);
!
public event Action SomethingHappens;
!
private void SmartOperation()
{
if ( SomethingHappens!=null ) /
/есть ли подписчики
SomethingHappens(«error»);
}
}
SmartClass ourClass = new SmartClass();
ourClass.SomethingHappens += ReactOnEvent;
private void ReactOnEvent (string option) {}

8. WPF. XAML
CustomerView.xaml
Label
ComboBox
TextBox
Button
code behind
пуст
CustomerView.xaml.cs
Grid
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="6"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="30"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="30"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
</Grid>

9. CustomerView.xaml
<Grid Margin = "4">
<Grid.ColumnDefinitions … />
<Grid.RowDefinitions … />
<Label Content = "Customer type:" Grid.Row = "0" Grid.Column = "0"
HorizontalAlignment = "Right"/>
<TextBox Text = "{Binding Path = FirstName}" Grid.Row = "2" Grid.Column = "2"/>
<ComboBox ItemsSource = "{Binding Path = CustomerTypeOptions, Mode = OneTime}"
SelectedItem = "{Binding Path = CustomerType}"/>
<Button Content = "Save" Grid.Row = "8" Grid.Column = "2"
HorizontalAlignment = "Right"
Command = "{Binding Path = SaveCommand}"/>
</Grid>

10. MVVM
msdn о MVVM Pattern:
http:/
/bit.ly/1k2Q6sY
Events
Прямая связь только так:
View
ViewModel
Model
Чтобы не было соблазна,
создавайте три разных
проекта (Project) в одном
Solution:
!
OurProgram.View
OurProgram.ViewModel
OurProgram.Model

11. Data Binding - привязка данных
public class MainViewModel : BaseViewModel
!
{
private string mFavoriteColor;
!
public string FavoriteColor
{
get { return mFavoriteColor; }
set
{
if (value != mFavoriteColor)
{
mFavoriteColor = value;
OnPropertyChanged("FavoriteColor");
}
}
Чтобы View узнало об
}
изменениях в ViewModel
}

12. INotifyPropertyChanged
public class BaseViewModel : INotifyPropertyChanged
!
{
#region INotifyPropertyChanged members
!
public event PropertyChangedEventHandler PropertyChanged;
!
protected virtual void OnPropertyChanged (string propertyName)
!
{
!
if (PropertyChanged != null)
!
{
!
var e = new PropertyChangedEventArgs (propertyName);
!
PropertyChanged (this, e);
!
}
!
}
!
#endregion
!
}

13. App.xaml.cs
DataContext
public partial class App : Application
!
{
protected override void OnStartup(StartupEventArgs e)
{
!
base.OnStartup(e);
!
MainWindow window = new MainWindow();
!
var viewModel = new MainViewModel();
!
window.DataContext = viewModel;
!
window.Show();
!
}
!
}

14. ICommand
public class MyCommand : ICommand
!
{
#region ICommand members
!
public bool CanExecute (object parameter)
{
… / если команда используется для Button, то при false Button будет не активна
/
!
}
!
public void Execute (object parameter)
!
{
…
!
}
!
public event EventHandler CanExecuteChanged
{
!
add { CommandManager.RequerySuggested += value; }
!
remove { CommandManager.RequerySuggessted -= value; }
!
}
!
#endregion
!
}

15. Использование RelayCommand
public class CustomerViewModel: BaseViewModel
!
{
private ICommand mSaveCommand;
!
public ICommand SaveCommand
{
get
{
if (mSaveCommand == null)
{
mSaveCommand = new RelayCommand(
param => this.Save(),
param => this.CanSave());
}
return mSaveCommand;
}
}
!
!
}
private void Save() {}
private bool CanSave() {}

16. Data Validation - IDataErrorInfo
public class CustomerViewModel: BaseViewModel, IDataErrorInfo
!
{
public string IDataErrorInfo.Error
{
get { return (_customer as IDataErrorInfo).Error; }
}
!
!
public string IDataErrorInfo.this[string propertyName]
{
get {
string error = null;
if (propertyName == "CustomerType")
error = this.ValidateCustomerType();
else
error = (_customer as IDataErrorInfo)[propertyName];
CommandManager.InvalidateRequerySuggested();
return error;
}
!
}
}
private string ValidateCustomerType()
{
if (this.CustomerType == Strings.CustomerViewModel_CustomerTypeOption_Company ||
this.CustomerType == Strings.CustomerViewModel_CustomerTypeOption_Person)
return null;
return Strings.CustomerViewModel_Error_MissingCustomerType;
}

17. IDataErrorInfo, xaml
<Grid>
<Grid.Resources>
<DataTemplate DataType="{x:Type ValidationError}">
<TextBlock FontStyle="Italic" Foreground="Red"
HorizontalAlignment="Right" Margin="0,1"
Text="{Binding Path=ErrorContent}" />
</DataTemplate>
</Grid.Resources>
!
<ComboBox x:Name="customerTypeCmb" Grid.Row="0" Grid.Column="2"
ItemsSource="{Binding Path=CustomerTypeOptions, Mode=OneTime}"
SelectedItem="{Binding Path=CustomerType,
ValidatesOnDataErrors=True}"
Validation.ErrorTemplate="{x:Null}"/>
!
<ContentPresenter Grid.Row="1" Grid.Column="2"
Content="{Binding ElementName=customerTypeCmb,
Path=(Validation.Errors).CurrentItem}"
/>
!

18. Спасибо за внимание!
Мария Нащанская
s.maria.k@gmail.com
!
@merry_ejik