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Add WPF MVVM Sample App (#353)
Using XAML value converters and some reflection to populate the lists of units.
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‎Samples/WpfMVVMSample/Readme.md‎

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## WPF MVVM Sample
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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.
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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.
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A key feature enabling this sample is the [UnitToStringConverter](https://github.com/dayewah/UnitsNet/blob/master/Samples/WpfMVVMSample/WpfMVVMSample/Converters/UnitToStringConverter.cs) class
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- If a parameter is entered as a number the unit is assigned automatically
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- If a parameter is entered as a unit other than the default it is converted automatically
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- If a non-compatible unit is used a validation error is triggered
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The default unit for each parameter and the result can be changed from the settings pull down.
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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
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# Visual Studio 15
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VisualStudioVersion = 15.0.27130.2010
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WpfMVVMSample", "WpfMVVMSample\WpfMVVMSample.csproj", "{B72F9215-70FF-4155-89BC-9A02CC550447}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{B72F9215-70FF-4155-89BC-9A02CC550447}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{B72F9215-70FF-4155-89BC-9A02CC550447}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{B72F9215-70FF-4155-89BC-9A02CC550447}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{B72F9215-70FF-4155-89BC-9A02CC550447}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {D5FA6C7A-26EC-4F45-B539-F20AD40CE0A4}
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EndGlobalSection
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EndGlobal

‎Samples/WpfMVVMSample/WpfMVVMSample/App.config‎

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

‎Samples/WpfMVVMSample/WpfMVVMSample/App.xaml‎

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<Application x:Class="WpfMVVMSample.App"
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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:local="clr-namespace:WpfMVVMSample">
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<Application.Resources>
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</Application.Resources>
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</Application>

‎Samples/WpfMVVMSample/WpfMVVMSample/App.xaml.cs‎

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

‎Samples/WpfMVVMSample/WpfMVVMSample/Bootstrapper.cs‎

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

‎Samples/WpfMVVMSample/WpfMVVMSample/Converters/EnumBindingSource.cs‎

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

‎Samples/WpfMVVMSample/WpfMVVMSample/Converters/UnitToStringConverter.cs‎

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

‎Samples/WpfMVVMSample/WpfMVVMSample/MainWindow.xaml‎

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<Window x:Class="WpfMVVMSample.MainWindow"
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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:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:prism="http://prismlibrary.com/"
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xmlns:conv="clr-namespace:WpfMVVMSample.Converters"
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xmlns:local="clr-namespace:WpfMVVMSample"
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xmlns:units="clr-namespace:UnitsNet.Units;assembly=UnitsNet"
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prism:ViewModelLocator.AutoWireViewModel="True"
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mc:Ignorable="d"
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Title="MainWindow">
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<Window.Resources>
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<Style TargetType="TextBox">
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<Setter Property="HorizontalAlignment" Value="Stretch"/>
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<Setter Property="HorizontalContentAlignment" Value="Center"/>
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<Setter Property="VerticalContentAlignment" Value="Center"/>
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<Setter Property="Height" Value="30"/>
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<Setter Property="FontSize" Value="16"/>
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<Setter Property="Margin" Value="10"/>
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</Style>
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<Style TargetType="ComboBox">
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<Setter Property="HorizontalAlignment" Value="Stretch"/>
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<Setter Property="HorizontalContentAlignment" Value="Center"/>
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<Setter Property="VerticalContentAlignment" Value="Center"/>
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<Setter Property="Height" Value="30"/>
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<Setter Property="FontSize" Value="16"/>
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<Setter Property="Margin" Value="10"/>
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</Style>
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<Style TargetType="Label" x:Key="ResultLabel">
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<Setter Property="HorizontalAlignment" Value="Center"/>
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<Setter Property="HorizontalContentAlignment" Value="Center"/>
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<Setter Property="VerticalContentAlignment" Value="Center"/>
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<Setter Property="Height" Value="30"/>
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<Setter Property="FontSize" Value="16"/>
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<Setter Property="Width" Value="150"/>
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<Setter Property="Margin" Value="10"/>
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</Style>
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<Style TargetType="Label">
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<Setter Property="HorizontalAlignment" Value="Right"/>
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<Setter Property="VerticalContentAlignment" Value="Center"/>
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<Setter Property="Margin" Value="10,0"/>
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<Setter Property="FontSize" Value="16"/>
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</Style>
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</Window.Resources>
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<StackPanel>
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<Expander Grid.Column="0" Grid.Row="3" Grid.ColumnSpan="3" FontSize="16" Background="WhiteSmoke">
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<Expander.Header>
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<Border>
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<Label Content="Settings"></Label>
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</Border>
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</Expander.Header>
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<Grid>
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width="1*"/>
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<ColumnDefinition Width="2*"/>
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<ColumnDefinition Width="1*"/>
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</Grid.ColumnDefinitions>
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<Grid.RowDefinitions>
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<RowDefinition Height="Auto"/>
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<RowDefinition Height="Auto"/>
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<RowDefinition Height="Auto"/>
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<RowDefinition Height="Auto"/>
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<RowDefinition Height="Auto"/>
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</Grid.RowDefinitions>
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<Label Grid.Column="0" Grid.Row="0" Content="Mass"/>
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<ComboBox Grid.Column="1"
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ItemsSource="{Binding Source={conv:EnumBindingSource {x:Type units:MassUnit}}}"
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SelectedItem="{Binding Settings.DefaultMassUnit}"/>
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<Label Grid.Column="0" Grid.Row="1" Content="G" />
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<ComboBox Grid.Column="1" Grid.Row="1"
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ItemsSource="{Binding Source={conv:EnumBindingSource {x:Type units:AccelerationUnit}}}"
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SelectedItem="{Binding Settings.DefaultAccelerationUnit}"/>
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<Label Grid.Column="0" Grid.Row="2" Content="Weight" />
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<ComboBox Grid.Column="1" Grid.Row="2"
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ItemsSource="{Binding Source={conv:EnumBindingSource {x:Type units:ForceUnit}}}"
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SelectedItem="{Binding Settings.DefaultForceUnit}"/>
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<Label Grid.Column="0" Grid.Row="3" Content="No. Digits" />
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<TextBox Grid.Column="1" Grid.Row="3" Text="{Binding Settings.SignificantDigits}"/>
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</Grid>
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</Expander>
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<Grid>
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width="1*"/>
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<ColumnDefinition Width="2*"/>
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<ColumnDefinition Width="1*"/>
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</Grid.ColumnDefinitions>
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<Grid.RowDefinitions>
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<RowDefinition Height="Auto"/>
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<RowDefinition Height="Auto"/>
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<RowDefinition Height="Auto"/>
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<RowDefinition Height="Auto"/>
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</Grid.RowDefinitions>
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<Label Grid.Column="0" Grid.Row="0" Content="Mass"/>
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<TextBox Grid.Column="1" Grid.Row="0" Text="{Binding ObjectMass, Converter={conv:UnitToStringConverter}}"/>
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<Label Grid.Column="0" Grid.Row="1" Content="G" />
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<TextBox Grid.Column="1" Grid.Row="1" Text="{Binding G, Converter={conv:UnitToStringConverter}}"/>
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<Label Grid.Column="0" Grid.Row="2" Content="Weight" />
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<Label Grid.Column="1" Grid.Row="2" Content="{Binding Weight, Converter={conv:UnitToStringConverter}}" Style="{StaticResource ResultLabel}"/>
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</Grid>
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</StackPanel>
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</Window>

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