WPF MVVM Sample App

Samples/WpfMVVMSample/Readme.md

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+## WPF MVVM Sample
+This is a simple sample showing how UnitsNet can be used to create a WPF MVVM application. I have used this strategy in a few simple engineering apps and thought I would share it as a sample to see if others might offer improvements.
+
+It performs a simple calculation allowing flexibility in the units for parameters and results. Default units for each are specified in the settings drop down.
+
+A key feature enabling this sample is the [UnitToStringConverter](https://github.com/dayewah/UnitsNet/blob/master/Samples/WpfMVVMSample/WpfMVVMSample/Converters/UnitToStringConverter.cs) class
+- If a parameter is entered as a number the unit is assigned automatically
+- If a parameter is entered as a unit other than the default it is converted automatically
+- If a non-compatible unit is used a validation error is triggered
+
+The default unit for each parameter and the result can be changed from the settings pull down.
+
+The number of significant digits displayed can also be changed from settings.

Samples/WpfMVVMSample/WpfMVVMSample.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.27130.2010
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WpfMVVMSample", "WpfMVVMSample\WpfMVVMSample.csproj", "{B72F9215-70FF-4155-89BC-9A02CC550447}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B72F9215-70FF-4155-89BC-9A02CC550447}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B72F9215-70FF-4155-89BC-9A02CC550447}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B72F9215-70FF-4155-89BC-9A02CC550447}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B72F9215-70FF-4155-89BC-9A02CC550447}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D5FA6C7A-26EC-4F45-B539-F20AD40CE0A4}
+	EndGlobalSection
+EndGlobal

Samples/WpfMVVMSample/WpfMVVMSample/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
+    </startup>
+</configuration>

Samples/WpfMVVMSample/WpfMVVMSample/App.xaml

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+<Application x:Class="WpfMVVMSample.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:WpfMVVMSample">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

Samples/WpfMVVMSample/WpfMVVMSample/App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace WpfMVVMSample
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            base.OnStartup(e);
+
+            var bootstrapper = new Bootstrapper();
+            bootstrapper.Run();
+        }
+    }
+}

Samples/WpfMVVMSample/WpfMVVMSample/Bootstrapper.cs

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+using Microsoft.Practices.ServiceLocation;
+using Microsoft.Practices.Unity;
+using Prism.Unity;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using WpfMVVMSample.Converters;
+using WpfMVVMSample.Settings;
+
+namespace WpfMVVMSample
+{
+    public class Bootstrapper : UnityBootstrapper
+    {
+        protected override DependencyObject CreateShell()
+        {
+            return Container.TryResolve<MainWindow>();
+        }
+
+        protected override void InitializeShell()
+        {
+            Application.Current.MainWindow.Show();
+        }
+
+        protected override void ConfigureContainer()
+        {
+            base.ConfigureContainer();
+
+            Container.RegisterType<SettingsManager>(new ContainerControlledLifetimeManager());//singleton
+        }
+
+        protected override void ConfigureServiceLocator()
+        {
+            base.ConfigureServiceLocator();
+
+            var serviceLocator = new UnityServiceLocator(Container);
+            ServiceLocator.SetLocatorProvider(() => serviceLocator);
+
+        }
+    }
+}

Samples/WpfMVVMSample/WpfMVVMSample/Converters/EnumBindingSource.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Markup;
+
+namespace WpfMVVMSample.Converters
+{
+    public class EnumBindingSourceExtension : MarkupExtension
+    {
+        private Type _enumType;
+        private Type EnumType
+        {
+            get { return this._enumType; }
+            set
+            {
+                if (value != this._enumType)
+                {
+                    if (value != null)
+                    {
+                        Type enumType = Nullable.GetUnderlyingType(value) ?? value;
+
+                        if (!enumType.IsEnum)
+                            throw new ArgumentException("Type must be for an Enum.");
+                    }
+
+                    this._enumType = value;
+                }
+            }
+        }
+
+        public EnumBindingSourceExtension() { }
+
+        public EnumBindingSourceExtension(Type enumType)
+        {
+            this.EnumType = enumType;
+        }
+
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            if (this._enumType== null)
+                throw new InvalidOperationException("The EnumType must be specified.");
+
+            Type actualEnumType = Nullable.GetUnderlyingType(this._enumType) ?? this._enumType;
+
+            //omits the first enum element, typically "undefined"
+            var enumValues = Enum.GetValues(actualEnumType).Cast<object>().Skip(1);
+
+            return enumValues;
+        }
+    }
+}

Samples/WpfMVVMSample/WpfMVVMSample/Converters/UnitToStringConverter.cs

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+using Microsoft.Practices.ServiceLocation;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Markup;
+using UnitsNet;
+using WpfMVVMSample.Settings;
+
+namespace WpfMVVMSample.Converters
+{
+    public class UnitToStringConverter :MarkupExtension, IValueConverter
+    {
+        //http://www.thejoyofcode.com/WPF_Quick_Tip_Converters_as_MarkupExtensions.aspx
+        private SettingsManager _settings;
+        private static UnitToStringConverter _instance;
+
+        public UnitToStringConverter()
+        {
+            if (!DesignerProperties.GetIsInDesignMode(new DependencyObject()))
+            {
+                _settings = ServiceLocator.Current.GetInstance<SettingsManager>();
+            }
+        }
+
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var unitType = value.GetType();
+            var unitEnumType = unitType.GetProperty("BaseUnit").PropertyType;
+            var unitEnumValue = _settings.GetDefaultUnit(unitEnumType);
+            var significantDigits = _settings.SignificantDigits;
+
+            var result = unitType
+                    .GetMethod("ToString", new[] { unitEnumType, typeof(IFormatProvider), typeof(int) })
+                    .Invoke(value, new object[] { unitEnumValue, null, significantDigits });
+
+            return result;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var unitEnumType = targetType.GetProperty("BaseUnit").PropertyType;
+            var unitEnumValue = _settings.GetDefaultUnit(unitEnumType);
+
+            if ((string)value == "") return 0.0;
+
+            double number;
+            if (double.TryParse((string)value, out number))
+                return ParseDouble(targetType, number, unitEnumType, unitEnumValue);
+
+            try
+            {
+                return ParseUnit(value, targetType);
+            }
+            catch (Exception e)
+            {
+                return new ValidationResult(false, e.InnerException.Message);
+            }
+        }
+
+
+        private static object ParseDouble(Type targetType, double number, Type unitEnumType, object unitEnumValue)
+        {
+            return targetType
+                .GetMethod("From", new[] { typeof(QuantityValue), unitEnumType })
+                .Invoke(null, new object[] { (QuantityValue)number, unitEnumValue });
+        }
+        private static object ParseUnit(object value, Type targetType)
+        {
+            return targetType
+                .GetMethod("Parse", new[] { typeof(string) })
+                .Invoke(null, new object[] { value });
+        }
+
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            return _instance ?? (_instance = new UnitToStringConverter());
+        }
+    }
+}

Samples/WpfMVVMSample/WpfMVVMSample/MainWindow.xaml

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+<Window x:Class="WpfMVVMSample.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:prism="http://prismlibrary.com/"
+        xmlns:conv="clr-namespace:WpfMVVMSample.Converters"
+        xmlns:local="clr-namespace:WpfMVVMSample"
+        xmlns:units="clr-namespace:UnitsNet.Units;assembly=UnitsNet"
+        prism:ViewModelLocator.AutoWireViewModel="True"
+
+        mc:Ignorable="d"
+        Title="MainWindow">
+    <Window.Resources>
+        <Style TargetType="TextBox">
+            <Setter Property="HorizontalAlignment" Value="Stretch"/>
+            <Setter Property="HorizontalContentAlignment" Value="Center"/>
+            <Setter Property="VerticalContentAlignment" Value="Center"/>
+            <Setter Property="Height" Value="30"/>
+            <Setter Property="FontSize" Value="16"/>
+            <Setter Property="Margin" Value="10"/>
+        </Style>
+        <Style TargetType="ComboBox">
+            <Setter Property="HorizontalAlignment" Value="Stretch"/>
+            <Setter Property="HorizontalContentAlignment" Value="Center"/>
+            <Setter Property="VerticalContentAlignment" Value="Center"/>
+            <Setter Property="Height" Value="30"/>
+            <Setter Property="FontSize" Value="16"/>
+            <Setter Property="Margin" Value="10"/>
+        </Style>
+        <Style TargetType="Label" x:Key="ResultLabel">
+            <Setter Property="HorizontalAlignment" Value="Center"/>
+            <Setter Property="HorizontalContentAlignment" Value="Center"/>
+            <Setter Property="VerticalContentAlignment" Value="Center"/>
+            <Setter Property="Height" Value="30"/>
+            <Setter Property="FontSize" Value="16"/>
+            <Setter Property="Width" Value="150"/>
+            <Setter Property="Margin" Value="10"/>
+        </Style>
+        <Style TargetType="Label">
+            <Setter Property="HorizontalAlignment" Value="Right"/>
+            <Setter Property="VerticalContentAlignment" Value="Center"/>
+            <Setter Property="Margin" Value="10,0"/>
+            <Setter Property="FontSize" Value="16"/>
+        </Style>
+    </Window.Resources>
+    <StackPanel>
+        <Expander Grid.Column="0" Grid.Row="3" Grid.ColumnSpan="3" FontSize="16" Background="WhiteSmoke">
+            <Expander.Header>
+                <Border>
+                    <Label Content="Settings"></Label>
+                </Border>
+            </Expander.Header>
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="1*"/>
+                    <ColumnDefinition Width="2*"/>
+                    <ColumnDefinition Width="1*"/>
+                </Grid.ColumnDefinitions>
+                <Grid.RowDefinitions>
+                    <RowDefinition Height="Auto"/>
+                    <RowDefinition Height="Auto"/>
+                    <RowDefinition Height="Auto"/>
+                    <RowDefinition Height="Auto"/>
+                    <RowDefinition Height="Auto"/>
+                </Grid.RowDefinitions>
+
+                <Label Grid.Column="0" Grid.Row="0" Content="Mass"/>
+                <ComboBox Grid.Column="1" 
+                  ItemsSource="{Binding Source={conv:EnumBindingSource {x:Type units:MassUnit}}}"
+                  SelectedItem="{Binding Settings.DefaultMassUnit}"/>
+
+                <Label Grid.Column="0" Grid.Row="1" Content="G" />
+                <ComboBox Grid.Column="1" Grid.Row="1"
+                  ItemsSource="{Binding Source={conv:EnumBindingSource {x:Type units:AccelerationUnit}}}"
+                  SelectedItem="{Binding Settings.DefaultAccelerationUnit}"/>
+
+                <Label Grid.Column="0" Grid.Row="2" Content="Weight" />
+                <ComboBox Grid.Column="1" Grid.Row="2"
+                  ItemsSource="{Binding Source={conv:EnumBindingSource {x:Type units:ForceUnit}}}"
+                  SelectedItem="{Binding Settings.DefaultForceUnit}"/>
+
+                <Label Grid.Column="0" Grid.Row="3" Content="No. Digits" />
+                <TextBox Grid.Column="1" Grid.Row="3" Text="{Binding Settings.SignificantDigits}"/>
+            </Grid>
+        </Expander>
+        <Grid>
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="1*"/>
+                <ColumnDefinition Width="2*"/>
+                <ColumnDefinition Width="1*"/>
+            </Grid.ColumnDefinitions>
+            <Grid.RowDefinitions>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
+            </Grid.RowDefinitions>
+
+            <Label Grid.Column="0" Grid.Row="0" Content="Mass"/>
+            <TextBox Grid.Column="1" Grid.Row="0" Text="{Binding ObjectMass, Converter={conv:UnitToStringConverter}}"/>
+
+            <Label Grid.Column="0" Grid.Row="1" Content="G" />
+            <TextBox Grid.Column="1" Grid.Row="1" Text="{Binding G, Converter={conv:UnitToStringConverter}}"/>
+
+            <Label Grid.Column="0" Grid.Row="2" Content="Weight" />
+            <Label Grid.Column="1" Grid.Row="2" Content="{Binding Weight, Converter={conv:UnitToStringConverter}}" Style="{StaticResource ResultLabel}"/>
+
+        </Grid>
+    </StackPanel>
+</Window>