Guidance for View-ViewModel
Yik Teng Hie
3 years ago
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# prism-knowledgebase
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# KnowledgeBase for Prism Guidance
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KnowledgeBase for Prism Pattern
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* [Official Site](https://prismlibrary.com/)
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* Existing Mitech-wpf use `Prism 4.x`. The only official legacy reference is based on [Prism 6](https://prismlibrary.com/docs/wpf/legacy/Introduction.html)
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* Its using `MEF Ioc (Dependency Injection)`. The `MEF DI` was removed from Prism 7.x and above. Only `Unity Dependency Injection` supported form Prism 7.x onward
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* The latest Prism Library is `8.1`
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* Prism 8 support NET 5 and dotnet Framework. Prism 6.x and below only DotNet Framework 4.8 and below
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## Tutorials
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- [View-ViewModel](./view-viewmodel.md)
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# Adding New View-ViewModel for Package Info
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1. Create XAML view code
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```xml
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<UserControl x:Class="MitechLib.Modules.PackagePage.Views.CarrierInfoView"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:local="clr-namespace:MitechLib.Modules.PackagePage.Views"
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mc:Ignorable="d"
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d:DesignHeight="450"
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d:DesignWidth="800">
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<UserControl.Resources>
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<Style TargetType="TextBlock"
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BasedOn="{StaticResource MiTStaticTxtStyle}" />
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</UserControl.Resources>
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<Grid>
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<DockPanel>
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<Grid>
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<Grid.ColumnDefinitions>
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<ColumnDefinition />
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<ColumnDefinition />
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</Grid.ColumnDefinitions>
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<!-- Labels -->
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<UniformGrid Grid.Column="0"
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Columns="1"
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Width="300"
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VerticalAlignment="Top">
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<UniformGrid.Background>
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<SolidColorBrush d:Color="AliceBlue" />
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</UniformGrid.Background>
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<TextBlock Text="Pitch X (mm)" />
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<TextBlock Text="Pitch Y (mm)" />
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<TextBlock Text="1st Pocket X (mm)" />
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<TextBlock Text="1st Pocket Y (mm)" />
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<TextBlock Text="Number of Pocket X" />
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<TextBlock Text="Number of Pocket Y" />
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</UniformGrid>
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<!-- Values -->
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<UniformGrid Grid.Column="1"
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Columns="1"
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VerticalAlignment="Top">
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<TextBox Text="2.2" />
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<TextBox Text="2.2" />
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<TextBox Text="2.2" />
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<TextBox Text="2.2" />
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<TextBox Text="2.2" />
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<TextBox Text="2.2" />
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</UniformGrid>
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</Grid>
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<UniformGrid DockPanel.Dock="Right"
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VerticalAlignment="Bottom"
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HorizontalAlignment="Right"
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Columns="1">
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<Button Content="Undo" />
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<Button Content="Save" />
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<Button Content="Exit" />
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</UniformGrid>
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</DockPanel>
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</Grid>
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</UserControl>
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```
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2. Create C# ViewModel Class
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```cs
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using MitechLib.Infrastructure.Data;
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namespace MitechLib.Modules.PackagePage.ViewModels
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{
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public class CarrierInfoViewModel : ViewModelBase
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{
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private string _labelPitchX;
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public string LabelPitchX
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{
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get { return _labelPitchX; }
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set { _labelPitchX = value; }
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}
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public CarrierInfoViewModel()
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{
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LabelPitchX = "Pitch X (mm)";
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}
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}
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}
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```
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3. Decorate the MEF `[Export] / [Import]` attributes
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```cs
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using MitechLib.Infrastructure.Data;
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using System.ComponentModel.Composition;
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namespace MitechLib.Modules.PackagePage.ViewModels
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{
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[Export]
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public class CarrierInfoViewModel : ViewModelBase
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{
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private string _labelPitchX;
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public string LabelPitchX
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{
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get { return _labelPitchX; }
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set { _labelPitchX = value; }
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}
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public CarrierInfoViewModel()
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{
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LabelPitchX = "Pitch X-- (mm)";
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}
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}
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}
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```
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```cs
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using Microsoft.Practices.Prism.Regions;
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using System.ComponentModel.Composition;
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using System.Windows.Controls;
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namespace MitechLib.Modules.PackagePage.Views
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{
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/// <summary>
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/// Interaction logic for CarrierInfoView.xaml
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/// </summary>
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[ViewSortHint("02")]
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[PartCreationPolicy(CreationPolicy.Shared)]
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[Export]
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public partial class CarrierInfoView : UserControl
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{
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public CarrierInfoView()
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{
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InitializeComponent();
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}
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}
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}
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```
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4. Setup DataContext Binding
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```cs
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using Microsoft.Practices.Prism.Regions;
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using MitechLib.Modules.PackagePage.ViewModels;
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using System.ComponentModel.Composition;
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using System.Diagnostics.CodeAnalysis;
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using System.Windows.Controls;
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namespace MitechLib.Modules.PackagePage.Views
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{
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/// <summary>
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/// Interaction logic for CarrierInfoView.xaml
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/// </summary>
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[ViewSortHint("02")]
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[PartCreationPolicy(CreationPolicy.Shared)]
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[Export]
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public partial class CarrierInfoView : UserControl
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{
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public CarrierInfoView()
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{
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InitializeComponent();
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}
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[Import]
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[SuppressMessage("Microsoft.Design", "CA1044:PropertiesShouldNotBeWriteOnly",
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Justification = "Needs to be a property to be composed by MEF")]
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public CarrierInfoViewModel ViewModel
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{
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set
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{
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this.DataContext = value;
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}
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}
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}
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}
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```
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```xml
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...
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<TextBlock Text="{Binding LabelPitchX}" />
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..
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```
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5. Integration with Mitech view registration by updating the `ModuleViewNames.cs` related dictionary with `MitechLib.InfrastructureModules`
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```cs
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public static readonly Dictionary<string, string> DeviceInfoRegion = new Dictionary<string, string>
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{
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{"CassetteInfoView", "MitechLib.Modules.PackagePage.Views.CassetteInfoView"},
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{"VisionSettingView", "MitechLib.Modules.PackagePage.Views.VisionSettingView"},
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//
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{"CarrierInfoView", "MitechLib.Modules.PackagePage.Views.CarrierInfoView"}
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};
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```
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