Tugas 4

 MVVW pada WPF


Langkah pembuatan aplikasi:

  • Memilih project WPF dengan menggunakan .NET Framework versi 5
  • Membuat class ItemPenjualan  sebagai model
        using System:
        using System.Collections.Generic;
        using System.Linq;
        using System.Text;
        using System.ComponentModel.DataAnnotations;
        using System.ComponentModel.DataAnnotations.Schema;
 
        namespace LatihanMVVM
        {
            public class ItemPenjualan
            {
                public ItemPenjualan()
                {
                    DiskonPersen = 0;
                }
 
                public long Id { get; set; }
 
                public string NamaBarang { get; set; }
 
                public int Jumlah { get; set; }
 
                public decimal Harga { get; set; }
 
                public decimal DiskonPersen { get; set; }
 
                public decimal Total()
                {
                    decimal total = Jumlah * Harga;
                    return total - (DiskonPersen / 100 * total);
                }
            }
        }    
  • Tambahkan reference System.ComponentModel.DataAnnotations pada solution aplikasi
  • Mengubah kode program pada MainWindow.xaml untuk membuat tampilan aplikasi

<Window ...

            Title="MainWindow" Height="356" Width="528">

    <Window.Resources>
        <Style TargetType="TextBlock">
            <Setter Property="FontSize" Value="20" />
            <Setter Property="FontFamily" Value="Myriad Pro" />
            <Setter Property="FontWeight" Value="SemiBold" />
            <Setter Property="Background">
                <Setter.Value>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FF508FC4" Offset="0" />
                        <GradientStop Color="#FF6F94AD" Offset="1" />
                        <GradientStop Color="#FFC7F3FF" Offset="0.302" />
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
            <Setter Property="Foreground">
                <Setter.Value>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FF5252CE" Offset="0" />
                        <GradientStop Color="#FF0000DB" Offset="0.953" />
                        <GradientStop Color="#FF6363CB" Offset="0.337" />
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
        </Style>
 
        <Style TargetType="Label">
            <Setter Property="FontSize" Value="14" />           
        </Style>
 
        <Style TargetType="TextBox">
            <Setter Property="Language" Value="in-IN" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Border x:Name="customBorder" Background="{TemplateBinding Background}"
                            CornerRadius="5" BorderThickness="2" BorderBrush="Gray">
                            <ScrollViewer x:Name="PART_ContentHost"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsKeyboardFocused" Value="True">                               
                                <Setter TargetName="customBorder" Property="Effect">
                                    <Setter.Value>
                                        <DropShadowEffect BlurRadius="10" ShadowDepth="0"
                                            Color="#578EC9"/>
                                    </Setter.Value>
                                </Setter>                               
                            </Trigger>
                            <Trigger Property="IsKeyboardFocused" Value="False">
                                <Setter Property="Foreground" Value="Gray" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
 
        <Style TargetType="Button">
            <Setter Property="Background" Value="#DEF2FC" />
            <Setter Property="Foreground" Value="Black" />
            <Setter Property="FontSize" Value="15"/>
            <Setter Property="Effect">
                <Setter.Value>
                    <DropShadowEffect BlurRadius="10" ShadowDepth="0" Color="#578EC9"/>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="customBorder" Background="{TemplateBinding Background}"
                            CornerRadius="4" BorderThickness="2" BorderBrush="Gray">
                            <ContentPresenter Content="{TemplateBinding Content}"
                                HorizontalAlignment="Center" />
                        </Border>    
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" Value="#2394CC" />
                                <Setter Property="Foreground" Value="White" />                               
                            </Trigger>
                            <Trigger Property="IsPressed" Value="True">                               
                                <Setter Property="Effect" Value="{x:Null}" />
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="Effect">
                                    <Setter.Value>
                                        <BlurEffect Radius="3"  />
                                    </Setter.Value>
                                </Setter>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>                   
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
 
    <Grid>       
        <Label Content="Nama Barang:" Height="29" HorizontalAlignment="Left" Margin="0,49,0,0"
            Name="label2" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="107" />
        <TextBox Height="23" HorizontalAlignment="Stretch" Margin="112,55,12,0" Name="textBox1"
            VerticalAlignment="Top" />
        <Label Content="Jumlah:" Height="27" HorizontalAlignment="Left" Margin="1,86,0,0"
            Name="label3" VerticalAlignment="Top" Width="106" HorizontalContentAlignment="Right" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="113,90,0,0" Name="textBox2"
            VerticalAlignment="Top" Width="62" />
        <Label Content="Harga:" Height="28" HorizontalAlignment="Left" Margin="12,122,0,0"
            Name="label4" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="95" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="113,127,0,0" Name="textBox3"
            VerticalAlignment="Top" Width="124" />
        <Button Content="Simpan" Height="27" HorizontalAlignment="Left" Margin="207,228,0,0"
            Name="button1" VerticalAlignment="Top" Width="82" />
        <Label Content="Diskon (%):" Height="33" HorizontalAlignment="Left" Margin="12,161,0,0"
            Name="label5" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="95" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="113,165,0,0" Name="textBox4"
            VerticalAlignment="Top" Width="62" />
        <Label Content="Total:" Height="33" HorizontalAlignment="Left" Margin="12,194,0,0"
            Name="label6" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="95" />
        <Label Content="Label" Height="28" HorizontalAlignment="Left" Margin="113,194,0,0"
            Name="label7" VerticalAlignment="Top" Width="402" />
        <TextBlock Height="28" HorizontalAlignment="Stretch" Name="textBlock1"
            Text="Tambah Item Penjualan" VerticalAlignment="Top" TextAlignment="Center"
            Margin="0,12,0,0" />
 
        <Grid.Background>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop Color="#FFB7CEFF" Offset="0.192" />
                <GradientStop Color="White" Offset="1" />
                <GradientStop Color="#FF1648AD" Offset="0" />
            </LinearGradientBrush>
        </Grid.Background>
 
    </Grid><Window.Resources>
        <Style TargetType="TextBlock">
            <Setter Property="FontSize" Value="20" />
            <Setter Property="FontFamily" Value="Myriad Pro" />
            <Setter Property="FontWeight" Value="SemiBold" />
            <Setter Property="Background">
                <Setter.Value>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FF508FC4" Offset="0" />
                        <GradientStop Color="#FF6F94AD" Offset="1" />
                        <GradientStop Color="#FFC7F3FF" Offset="0.302" />
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
            <Setter Property="Foreground">
                <Setter.Value>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FF5252CE" Offset="0" />
                        <GradientStop Color="#FF0000DB" Offset="0.953" />
                        <GradientStop Color="#FF6363CB" Offset="0.337" />
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
        </Style>
 
        <Style TargetType="Label">
            <Setter Property="FontSize" Value="14" />           
        </Style>
 
        <Style TargetType="TextBox">
            <Setter Property="Language" Value="in-IN" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Border x:Name="customBorder" Background="{TemplateBinding Background}"
                            CornerRadius="5" BorderThickness="2" BorderBrush="Gray">
                            <ScrollViewer x:Name="PART_ContentHost"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsKeyboardFocused" Value="True">                               
                                <Setter TargetName="customBorder" Property="Effect">
                                    <Setter.Value>
                                        <DropShadowEffect BlurRadius="10" ShadowDepth="0"
                                        Color="#578EC9"/>
                                    </Setter.Value>
                                </Setter>                               
                            </Trigger>
                            <Trigger Property="IsKeyboardFocused" Value="False">
                                <Setter Property="Foreground" Value="Gray" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
 
        <Style TargetType="Button">
            <Setter Property="Background" Value="#DEF2FC" />
            <Setter Property="Foreground" Value="Black" />
            <Setter Property="FontSize" Value="15"/>
            <Setter Property="Effect">
                <Setter.Value>
                    <DropShadowEffect BlurRadius="10" ShadowDepth="0" Color="#578EC9"/>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="customBorder" Background="{TemplateBinding Background}"
                            CornerRadius="4" BorderThickness="2" BorderBrush="Gray">
                            <ContentPresenter Content="{TemplateBinding Content}"
                                HorizontalAlignment="Center" />
                        </Border>    
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" Value="#2394CC" />
                                <Setter Property="Foreground" Value="White" />                               
                            </Trigger>
                            <Trigger Property="IsPressed" Value="True">                               
                                <Setter Property="Effect" Value="{x:Null}" />
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="Effect">
                                    <Setter.Value>
                                        <BlurEffect Radius="3"  />
                                    </Setter.Value>
                                </Setter>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>                   
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
 
    <Grid>       
        <Label Content="Nama Barang:" Height="29" HorizontalAlignment="Left"
            Margin="0,49,0,0" Name="label2" VerticalAlignment="Top"
            HorizontalContentAlignment="Right" Width="107" />
        <TextBox Height="23" HorizontalAlignment="Stretch" Margin="112,55,12,0"
            Name="textBox1" VerticalAlignment="Top" />
        <Label Content="Jumlah:" Height="27" HorizontalAlignment="Left"
            Margin="1,86,0,0" Name="label3" VerticalAlignment="Top" Width="106"
            HorizontalContentAlignment="Right" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="113,90,0,0"
            Name="textBox2" VerticalAlignment="Top" Width="62" />
        <Label Content="Harga:" Height="28" HorizontalAlignment="Left" Margin="12,122,0,0"
            Name="label4" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="95" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="113,127,0,0"
            Name="textBox3" VerticalAlignment="Top" Width="124" />
        <Button Content="Simpan" Height="27" HorizontalAlignment="Left" Margin="207,228,0,0"
            Name="button1" VerticalAlignment="Top" Width="82" />
        <Label Content="Diskon (%):" Height="33" HorizontalAlignment="Left" Margin="12,161,0,0"
            Name="label5" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="95" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="113,165,0,0"
            Name="textBox4" VerticalAlignment="Top" Width="62" />
        <Label Content="Total:" Height="33" HorizontalAlignment="Left" Margin="12,194,0,0"
            Name="label6" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="95" />
        <Label Content="Label" Height="28" HorizontalAlignment="Left" Margin="113,194,0,0"
            Name="label7" VerticalAlignment="Top" Width="402" />
        <TextBlock Height="28" HorizontalAlignment="Stretch" Name="textBlock1"
            Text="Tambah Item Penjualan" VerticalAlignment="Top" TextAlignment="Center"
            Margin="0,12,0,0" />
 
        <Grid.Background>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop Color="#FFB7CEFF" Offset="0.192" />
                <GradientStop Color="White" Offset="1" />
                <GradientStop Color="#FF1648AD" Offset="0" />
            </LinearGradientBrush>
        </Grid.Background>
 
    </Grid>
</Window>
  • Membuat class itemPenjualanViewModel sebagai viewmodel
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
 
namespace LatihanMVVM
{
    class ItemPenjualanViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
 
        private ItemPenjualan model;
 
        public ItemPenjualanViewModel(ItemPenjualan itemPenjualan = null)
        {
            this.model = itemPenjualan ?? new ItemPenjualan();
        }
 
        public string NamaBarang
        {
            get { return model.NamaBarang; }
            set
            {
                if (value != model.NamaBarang)
                {
                    model.NamaBarang = value;
                    PropertyChanged(this, new PropertyChangedEventArgs("NamaBarang"));
                }
            }
        }
 
        public int Jumlah
        {
            get { return model.Jumlah; }
            set
            {
                if (value != model.Jumlah)
                {
                    model.Jumlah = value;
                    PropertyChanged(this, new PropertyChangedEventArgs("Jumlah"));
                    PropertyChanged(this, new PropertyChangedEventArgs("Total"));
                }
            }
        }
 
        public decimal Harga
        {
            get { return model.Harga; }
            set
            {
                if (value != model.Harga)
                {
                    model.Harga = value;
                    PropertyChanged(this, new PropertyChangedEventArgs("Harga"));
                    PropertyChanged(this, new PropertyChangedEventArgs("Total"));
                }
            }
        }
 
        public decimal DiskonPersen
        {
            get { return model.DiskonPersen; }
            set
            {
                if (value != model.DiskonPersen)
                {
                    model.DiskonPersen = value;
                    PropertyChanged(this, new PropertyChangedEventArgs("DiskonPersen"));
                    PropertyChanged(this, new PropertyChangedEventArgs("Total"));
                }
            }
        }
 
        public string Total
        {
            get
            {
                decimal? total = model.Total();
                if (!total.HasValue)
                {
                    return "-";
                }
                else
                {
                    return total.Value.ToString("C");
                }
            }
        }
 
        public ItemPenjualan Model
        {
            get { return this.model; }
        }
    }
}

  • Mengubah class MainWindow.xaml.cs untuk menghubungkan model dengan view
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
 
namespace LatihanMVVM
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DataContext = new ItemPenjualanViewModel();
        }
    }
}

  • Mengubah kode program pada MainWindow.xaml untuk melakukan binding dan menambahkan validation
...
<Label Content="Nama Barang:" ... />
<TextBox Name="textBox1" ... Text="{Binding Path=NamaBarang}"/>
 
<Label Content="Jumlah:" ... />
<TextBox ... Text="{Binding Path=Jumlah, StringFormat={}{0:#,0}}"/>
 
<Label Content="Harga:" ... />
<TextBox ... Text="{Binding Path=Harga, StringFormat={}{0:C}}"/>               
 
<Label Content="Diskon (%):" ... />
<TextBox ... Text="{Binding Path=DiskonPersen, StringFormat={}{0:#.#}}"/>
 
<Label Content="Total:" ... />
<Label .... Content="{Binding Path=Total}" />
...


...
<Style TargetType="TextBox">
   ...
   <Setter Property="Validation.ErrorTemplate">
      <Setter.Value>
         <ControlTemplate>
            <StackPanel Orientation="Horizontal">
               <AdornedElementPlaceholder />                                                           
               <TextBlock Text="Perlu diperbaiki!" Padding="3" Foreground="Red" />
            </StackPanel>
         </ControlTemplate>
      </Setter.Value>
   </Setter>
   ...
</Style>
...

  • Sebelum mengubah kode program pada MainWindow.xaml, kita perlu mendownload MySQL Connector/.NET versi 6. Disini saya menggunakan versi 6.8.7
  • Selanjutnya kita perlu menambahkan reference MySql.Data.Entity.EF6
  • Tambahkan Nuget Package Entity Framework 6
  • Mengubah kode program pada App.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  ...
  <entityFramework>   
    <providers>
      <provider invariantName="MySql.Data.MySqlClient"
            type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />     
    </providers>   
  </entityFramework>
  <connectionStrings>
    <add name="LatihanContext"
        connectionString="server=localhost; database=latihan; uid=steven; password=12345"
        providerName="MySql.Data.MySqlClient" />
  </connectionStrings>
</configuration>

  • Mengubah kode program pada ItemPenjualan.cs untuk menambahkan sebuah atribut di model agar nilai property Id dihasilkan secara otomatis oleh database (melalui auto number)
...
using System.ComponentModel.DataAnnotations.Schema;
 
namespace LatihanMVVM
{
    public class ItemPenjualan
    {
 
        ...
 
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public long Id { get; set; }
 
        [StringLength(50)]
        public string NamaBarang { get; set; }
 
        ...
 
    }
}

  • Membuat class LatihanContext
using System.Data.Entity;
 
namespace LatihanMVVM
{
    class LatihanContext : DbContext
    {
        public DbSet<ItemPenjualan> DaftarItemPenjualan { get; set; }
    }
}
  • Membuat class MyHistoryContext
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Entity.Migrations.History;
using System.Data.Common;
using System.Data.Entity;
 
namespace LatihanMVVM
{
    public class MyHistoryContext : HistoryContext
    {
        public MyHistoryContext(DbConnection dbConnection, string defaultSchema)
            : base(dbConnection, defaultSchema)
        {
        }
 
        protected override void OnModelCreating(System.Data.Entity.DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Entity<HistoryRow>().Property(p => p.MigrationId).HasMaxLength(100)
                .IsRequired();
            modelBuilder.Entity<HistoryRow>().Property(p => p.ContextKey).HasMaxLength(200)
                .IsRequired();
        }
    }
 
    public class ModelConfiguration : DbConfiguration
    {
        public ModelConfiguration()
        {
            SetHistoryContext("MySql.Data.MySqlClient", (c, s) => new MyHistoryContext(c, s));
        }
    }
}
  • Mengubah kode program dari class ItemPenjualanViewModel untuk menambah class SimpanCommand dan propertynya pada ViewModel
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Windows.Input;
using System.Windows;
 
namespace LatihanMVVM
{
    public class ItemPenjualanViewModel : INotifyPropertyChanged
    {
    ...
 
        private ICommand simpanCommand;
 
        ...
 
        public ICommand SimpanCommand
        {
            get
            {
                if (this.simpanCommand == null)
                {
                    this.simpanCommand = new SimpanCommand(this);
                }
                return this.simpanCommand;
            }
        }
 
    }
 
 
    public class SimpanCommand : ICommand
    {
 
        private ItemPenjualanViewModel viewModel;
 
        public SimpanCommand(ItemPenjualanViewModel viewModel)
        {
            this.viewModel = viewModel;
        }
 
        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }
 
        public bool CanExecute(object parameter)
        {
            return viewModel.Model.Total() > 0;
        }
 
        public void Execute(object parameter)
        {
            using (var db = new LatihanContext())
            {
                db.Database.Log = Console.Write;
                db.DaftarItemPenjualan.Add(viewModel.Model);
                db.SaveChanges();
                MessageBox.Show("Data berhasil disimpan ke database");
            }
        }
 
    }
}
  • Mengubah kode program pada MainWindow.xaml untuk melakukan binding pada button simpan
...
<Button Content="Simpan" ... Command="{Binding SimpanCommand}"/>
...
  • Tambahkan kode pada LatihanContext.cs 
using System.Data.Entity;
 
namespace LatihanMVVM
{
    
   [DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
    class LatihanContext : DbContext
    {
        public DbSet<ItemPenjualan> DaftarItemPenjualan { get; set; }
    }
}
  • Buat migration database dengan cara membuka package manager console, lalu ketikkan Enable-Migrations dan Add-Migration dengan package name initial
  • Migrate database dengan mengetikkan Update-Database dan database kita akan otomatis ter-update
  • Jalankan program

Hasil:


Tampilan awal


Salah input data

Data benar

Submit data

Database









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