#眉標=LINQ	
#副標=剖析LINQ運作機制（6）
#大標= WPF、Windows Form有何不同？
#作者=文／圖	黃忠成


==<box>===========
程式1
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="346" Width="547">
    <Grid>
        <ToolBarTray Height="26" Name="toolBarTray1" VerticalAlignment="Top">
            <ToolBar Band="1" BandIndex="1">
                <Button Content="New"  Width="68" Height="27">
                </Button>
                <Button Content="&lt;"  Width="68" Height="27">
                </Button>
                <Button Content=">"  Width="68" Height="27">                    
                </Button>
                <Button Content="Save"  Width="68" Height="27">                    
                </Button>
                <Button Content="Cancel"  Width="68" Height="27">                    
                </Button>
                <Button Content="Delete"  Width="68" Height="27">                    
                </Button>
            </ToolBar>
        </ToolBarTray>
    </Grid>
</Window>
==<end>==============




==<box>===========
程式2
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="346" Width="547">
    <Grid>
        <ToolBarTray Height="26" Name="toolBarTray1"  VerticalAlignment="Top">
            <ToolBarTray.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="#FF508AAA" Offset="0.711"/>
                    <GradientStop Color="#FFFFFFFF" Offset="0.04"/>
                </LinearGradientBrush>
            </ToolBarTray.Background>
            <ToolBar Band="1" BandIndex="1" >
                <ToolBar.Background>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FF508AAA" Offset="0.711"/>
                        <GradientStop Color="#FFFFFFFF" Offset="0.04"/>
                    </LinearGradientBrush>
                </ToolBar.Background>
                <Button Content="New" Foreground="White"  Width="68" Height="27">                    
                </Button>
                <Button Content="&lt;" Foreground="White"  Width="68" Height="27">
                </Button>
                <Button Content=">"  Foreground="White" Width="68" Height="27">                    
                </Button>
                <Button Content="Save" Foreground="White"  Width="68" Height="27">                    
                </Button>
                <Button Content="Cancel" Foreground="White"  Width="68" Height="27">                    
                </Button>
                <Button Content="Delete"  Foreground="White"  Width="68" Height="27">                    
                </Button>
            </ToolBar>
        </ToolBarTray>
    </Grid>
</Window>
==<end>==============




==<box>===========
程式3
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="346" Width="547">
    <Grid>
        <ToolBarTray Height="26" Name="toolBarTray1"  VerticalAlignment="Top">
            .................略.............
        </ToolBarTray>
        
        <Label Height="28" HorizontalAlignment="Left" Margin="16,50,0,0" 
           Name="label1" VerticalAlignment="Top" Width="91">CustomerID:</Label>
        <TextBox Height="23" Margin="127,53,0,0" 
                 BorderThickness="1,1,2,2" Name="textBox1" VerticalAlignment="Top" 
                 HorizontalAlignment="Left" Text="{Binding Path=CustomerID}" 
                 Width="84">
        </TextBox>
        <Label Height="28" Margin="225,50,306,0" Name="label2" 
　　　　　　　　VerticalAlignment="Top">Company Name:</Label>
        <TextBox Height="23" HorizontalAlignment="Right" BorderThickness="1,1,2,2" 
                 Margin="0,52,40,0" Name="textBox2" Text="{Binding Path=CompanyName}" 
                 VerticalAlignment="Top" Width="266" >
        </TextBox>
        <Label Height="28" HorizontalAlignment="Left" Margin="16,106,0,0" 
               Name="label3" VerticalAlignment="Top" Width="100">Contact Name:
　　　　</Label>
        <TextBox Height="23" Margin="127,109,315,0" Name="textBox3" 
                 BorderThickness="1,1,2,2" VerticalAlignment="Top" 
                 Text="{Binding Path=ContactName}">
        </TextBox>
        <Label HorizontalAlignment="Left" Margin="19,168,0,164" Name="label4" 
               Width="95">Contact Title:</Label>
        <TextBox Margin="127,171,113,166" Name="textBox4" 
                 BorderThickness="1,1,2,2" Text="{Binding Path=ContactTitle}">            
        </TextBox>
        <Label Height="28" HorizontalAlignment="Left" Margin="16,0,0,102" 
　　　　　Name="label5" VerticalAlignment="Bottom" Width="100">Address:</Label>
        <TextBox Margin="127,0,95,45" Name="textBox5" 
                 BorderThickness="1,1,2,2" Text="{Binding Path=Address}" 
                 TextDecorations="None" Height="82" VerticalAlignment="Bottom">
        </TextBox>
    </Grid>
</Window>
==<end>==============





==<box>===========
程式4
.xaml
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="346" Width="547" Loaded="Window_Loaded">
..............略

.xaml.cs
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 WpfApplication1
{
    public partial class Window1 : Window
    {
        NorthwindDataContext context = new NorthwindDataContext();
        public Window1()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            DataContext = from s in context.Customers orderby s.CustomerID select s;
        }
    }
}
==<end>==============




==<box>===========
程式5
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="346" Width="547" Loaded="Window_Loaded">
    <Window.Resources>
        <Style x:Key="RadiousTextBox" TargetType="{x:Type TextBox}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TextBox}">
                        <Border CornerRadius="8"  
                         Background="{TemplateBinding Background}"   
                         BorderThickness="{TemplateBinding BorderThickness}"  
                         BorderBrush="{TemplateBinding BorderBrush}">
                            <AdornerDecorator 
　　　　　　　　              x:Name="PART_ContentHost"
　　　　　　　　              Focusable="False" />
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
    <Grid>
        <Grid.Background>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop Color="#FFEDF0F4" Offset="0"/>
                <GradientStop Color="#FF8C8E92" Offset="1"/>
            </LinearGradientBrush>
        </Grid.Background>        
 ...........略.............
        <TextBox Height="23" Margin="127,53,0,0" 
                 BorderThickness="1,1,2,2" Name="textBox1" VerticalAlignment="Top" 
                 HorizontalAlignment="Left" Text="{Binding Path=CustomerID}" 
                 Width="84" Style="{StaticResource RadiousTextBox}" >
            <TextBox.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="#FFE6ECF2" Offset="0.031"/>
                    <GradientStop Color="#FFB2BACC" Offset="0.871"/>
                </LinearGradientBrush>
            </TextBox.Background>
        </TextBox>
.........略......
==<end>==============





==<box>===========
程式6
.xaml
..............
<Button Content="&lt;"  Width="68" Height="27" Foreground="#FFF3F0F0" Click="Prev_Click">
                    <Button.Background>
                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                            <GradientStop Color="#FF508AAA" Offset="0.711"/>
                            <GradientStop Color="#FFFFFFFF" Offset="0.04"/>
                        </LinearGradientBrush>
                    </Button.Background>
                </Button>
                <Button Content=">"  Width="68" Height="27" 
　　　　　　　　　　Foreground="#FFF3F0F0" Click="Next_Click">
                    <Button.Background>
                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                            <GradientStop Color="#FF508AAA" Offset="0.711"/>
                            <GradientStop Color="#FFFFFFFF" Offset="0.04"/>
                        </LinearGradientBrush>
                    </Button.Background>
                </Button>
................
.xaml.cs
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;
using System.ComponentModel;
using System.Data.Linq;
using System.Reflection;

namespace LinqWPF1
{    
    public partial class Window1 : Window
    {
        private NorthwindDataContext context = new NorthwindDataContext();
        private ICollectionView view = null;

        public Window1()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            DataContext = from s in context.Customers 
　　　　　　　　　　　　　orderby s.CustomerID select s;
            view = CollectionViewSource.GetDefaultView(DataContext);
        }

        private void Next_Click(object sender, RoutedEventArgs e)
        {
            if (!view.MoveCurrentToNext())
                view.MoveCurrentToLast();
        }

        private void Prev_Click(object sender, RoutedEventArgs e)
        {
            if (!view.MoveCurrentToPrevious())
                view.MoveCurrentToFirst();
        }
    }
}
==<end>==============





==<box>===========
程式7
.xaml
.............略........
<Button Content="New"  Width="68" Height="27" Foreground="#FFF3F0F0" Click="New_Click">
.....略........
<Button Content="&lt;"  Width="68" Height="27" Foreground="#FFF3F0F0" Click="Prev_Click">
.....略........
<Button Content=">"  Width="68" Height="27" Foreground="#FFF3F0F0" Click="Next_Click">
..........略........
<Button Content="Save"  Width="68" Height="27" Foreground="#FFF3F0F0" Click="Save_Click">
..........略..........
<Button Content="Cancel"  Width="68" Height="27" Foreground="#FFF3F0F0" 
　　　　　Click="Cancel_Click">
........略.........
<Button Content="Delete"  Width="68" Height="27" 
　　　　　Foreground="#FFF3F0F0" Click="Delete_Click">
.xaml.cs
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;
using System.ComponentModel;
using System.Data.Linq;
using System.Reflection;

namespace LinqWPF1
{
    public partial class Window1 : Window
    {
        private NorthwindDataContext context = new NorthwindDataContext();
        private ICollectionView view = null;
        private IBindingList bindingList = null;
        private bool _isAddMode = false;

        public Window1()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            DataContext = from s in context.Customers orderby s.CustomerID select s;
            view = CollectionViewSource.GetDefaultView(DataContext);
            bindingList = ((IListSource)DataContext).GetList() as IBindingList;
        }
        .......略.........
        private void Save_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Focus();
            if (_isAddMode) ((ICancelAddNew)bindingList).EndNew(view.CurrentPosition);            
            context.SubmitChanges();
            _isAddMode = false;            
        }

        private void Cancel_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Focus();
            if (_isAddMode)
            {
                ((ICancelAddNew)bindingList).CancelNew(view.CurrentPosition);
                _isAddMode = false;
            }
            else
            {
                object original = 
                   ((ITable)context.Customers).GetOriginalEntityState(view.CurrentItem);
                object current = view.CurrentItem;
                foreach (PropertyInfo pi in current.GetType().GetProperties())
                    pi.SetValue(current, pi.GetValue(original, null), null);
            }
        }
        private void New_Click(object sender, RoutedEventArgs e)
        {
            if (_isAddMode) return;
            Customer item = new Customer();
            bindingList.AddNew();
            view.MoveCurrentToLast();
            _isAddMode = true;
        }
        private void Delete_Click(object sender, RoutedEventArgs e)
        {
            if (_isAddMode)
                Cancel_Click(null, null);
            bindingList.Remove(view.CurrentItem);
            context.SubmitChanges();
        }
    }
}
==<end>==============