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Silverlight MVVM 贴近实战(六)

分类：Silverlight作者：编程之家

扯面工程师，配菜工程师，门迎工程师，当今世界工程师可真多啊。

今天我们把系统参数管理模块翻译成Silverlight项目。首先请看两张图

再看看翻译好的图

其实我们看到了第二张图用到了treeView,Popup,这节主要讲的还是MVVM，不过和以往有所不同。先看看前台代码

 
 
    

  1. <controls:ChildWindow x:Class="MISInfoManage.CodeManageView" 
    2. 
  
  
  2. 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 

    3. 
  
  
  3. 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 

    4. 
  
  
  4. 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

    5. 
  
  
  5. 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

    6. 
  
  
  6. 
    xmlns:toolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls" 

    7. 
  
  
  7. 
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" 

    8. 
  
  
  8. 
    xmlns:resource="clr-namespace:MISInfoManage.Resources" 

    9. 
  
  
  9. 
    xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls" 

    10. 
  
  
  10. 
    xmlns:Primitives="clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows" 

    11. 
  
  
  11. 
    mc:Ignorable="d" Width="700" Height="400" FontSize="13" 

    12. 
  
  
  12. 
    Title="系统参数管理"> 

    13. 
  
  
  13. 
    <controls:ChildWindow.Resources> 

    14. 
  
  
  14. 
        <resource:CodeManageResource x:Key="CodeManageResource"/> 

    15. 
  
  
  15. 
        <Style x:Key="ColumnHeaderStyle" targettype="sdk:DataGridColumnHeader"> 

    16. 
  
  
  16. 
            <Setter Property="Height" Value="25"></Setter> 

    17. 
  
  
  17. 
        </Style> 

    18. 
  
  
  18. 
    </controls:ChildWindow.Resources> 

    19. 
  
  
  19. 
    <Grid x:Name="LayoutRoot" Background="White"> 

    20. 
  
  
  20. 
        <Grid.RowDeFinitions> 

    21. 
  
  
  21. 
            <RowDeFinition Height="*"></RowDeFinition> 

    22. 
  
  
  22. 
        </Grid.RowDeFinitions> 

    23. 
  
  
  23. 
        <Grid.ColumnDeFinitions> 

    24. 
  
  
  24. 
            <ColumnDeFinition Width="Auto"></ColumnDeFinition> 

    25. 
  
  
  25. 
            <ColumnDeFinition Width="*"></ColumnDeFinition> 

    26. 
  
  
  26. 
            <ColumnDeFinition Width="0"></ColumnDeFinition> 

    27. 
  
  
  27. 
        </Grid.ColumnDeFinitions> 

    28. 
  
  
  28. 
        <Border BorderBrush="AliceBlue" Width="150" Grid.Row="0" Grid.Column="0" BorderThickness="1" CornerRadius="2" Margin="0,10,0"> 

    29. 
  
  
  29. 
            <toolkit:TreeView x:Name="treeViewCode"></toolkit:TreeView> 

    30. 
  
  
  30. 
        </Border> 

    31. 
  
  
  31. 
        <sdk:DataGrid Grid.Row="0" Grid.Column="1" 

    32. 
  
  
  32. 
                          BorderBrush="Black" BorderThickness="1" 

    33. 
  
  
  33. 
                          IsReadOnly="True" x:Name="dgCodeList" 

    34. 
  
  
  34. 
                          AutoGenerateColumns="False" 

    35. 
  
  
  35. 
                          AlternatingRowBackground="Gray" 

    36. 
  
  
  36. 
                          CanUserReorderColumns="True" 

    37. 
  
  
  37. 
                          VerticalScrollBarVisibility="Auto" 

    38. 
  
  
  38. 
                          HorizontalScrollBarVisibility="Auto"   

    39. 
  
  
  39. 
                          SelectionMode="Single" 

    40. 
  
  
  40. 
                          SelectedItem="{Binding CodeEntity,Mode=TwoWay}" 

    41. 
  
  
  41. 
                          ItemsSource="{Binding CodeList,Mode=OneWay}" 

    42. 
  
  
  42. 
                          CanUserSortColumns="True"> 

    43. 
  
  
  43. 
            <sdk:DataGrid.Columns> 

    44. 
  
  
  44. 
                <sdk:DataGridTemplateColumn Header="选择"> 

    45. 
  
  
  45. 
                    <sdk:DataGridTemplateColumn.CellTemplate> 

    46. 
  
  
  46. 
                        <DataTemplate> 

    47. 
  
  
  47. 
                            <CheckBox HorizontalAlignment="Center"></CheckBox> 

    48. 
  
  
  48. 
                        </DataTemplate> 

    49. 
  
  
  49. 
                    </sdk:DataGridTemplateColumn.CellTemplate> 

    50. 
  
  
  50. 
                </sdk:DataGridTemplateColumn> 

    51. 
  
  
  51. 
                <sdk:DataGridTextColumn Binding="{Binding data,Mode=OneWay}" HeaderStyle="{StaticResource ColumnHeaderStyle}" Header="数据值"/> 

    52. 
  
  
  52. 
                <sdk:DataGridTextColumn Binding="{Binding ename,Mode=OneWay}" HeaderStyle="{StaticResource ColumnHeaderStyle}" Header="英文代码"/> 

    53. 
  
  
  53. 
                <sdk:DataGridTextColumn Binding="{Binding cname,Mode=OneWay}" HeaderStyle="{StaticResource ColumnHeaderStyle}" Header="中文代码"/> 

    54. 
  
  
  54. 
                <sdk:DataGridTextColumn Binding="{Binding display_content,Mode=OneWay}" HeaderStyle="{StaticResource ColumnHeaderStyle}" Header="显示值"/> 

    55. 
  
  
  55. 
                <sdk:DataGridTemplateColumn Header="操作"> 

    56. 
  
  
  56. 
                    <sdk:DataGridTemplateColumn.CellTemplate> 

    57. 
  
  
  57. 
                        <DataTemplate> 

    58. 
  
  
  58. 
                            <StackPanel> 

    59. 
  
  
  59. 
                                <StackPanel.Resources> 

    60. 
  
  
  60. 
                                    <Style x:Key="buttonStyle" targettype="Button"> 

    61. 
  
  
  61. 
                                        <Setter Property="Template"> 

    62. 
  
  
  62. 
                                            <Setter.Value> 

    63. 
  
  
  63. 
                                                <ControlTemplate targettype="Button"> 

    64. 
  
  
  64. 
                                                    <Border CornerRadius="2" BorderThickness="1" BorderBrush="Red"> 

    65. 
  
  
  65. 
                                                        <StackPanel Orientation="Horizontal" Background="Turquoise"> 

    66. 
  
  
  66. 
                                                            <StackPanel.Effect> 

    67. 
  
  
  67. 
                                                                <DropShadowEffect Color="Black" Direction="270" ShadowDepth="5"   

    68. 
  
  
  68. 
                                                                    BlurRadius="5" Opacity="0.5"> 

    69. 
  
  
  69. 
                                                                </DropShadowEffect> 

    70. 
  
  
  70. 
                                                            </StackPanel.Effect> 

    71. 
  
  
  71. 
                                                            <Image Source="/MISInfoManage;component/Images/drag.png" Height="25" Width="60"/> 

    72. 
  
  
  72. 
                                                            <TextBlock Text="修改" Foreground="brown" FontWeight="Bold"></TextBlock> 

    73. 
  
  
  73. 
                                                        </StackPanel> 

    74. 
  
  
  74. 
                                                    </Border> 

    75. 
  
  
  75. 
                                                </ControlTemplate> 

    76. 
  
  
  76. 
                                            </Setter.Value> 

    77. 
  
  
  77. 
                                        </Setter> 

    78. 
  
  
  78. 
                                    </Style> 

    79. 
  
  
  79. 
                                </StackPanel.Resources> 

    80. 
  
  
  80. 
                                <Button Content="Button1"  Style="{StaticResource buttonStyle}"/> 

    81. 
  
  
  81. 
                            </StackPanel> 

    82. 
  
  
  82. 
                        </DataTemplate> 

    83. 
  
  
  83. 
                    </sdk:DataGridTemplateColumn.CellTemplate> 

    84. 
  
  
  84. 
                </sdk:DataGridTemplateColumn> 

    85. 
  
  
  85. 
            </sdk:DataGrid.Columns> 

    86. 
  
  
  86. 
        </sdk:DataGrid> 

    87. 
  
  
  87. 
        <Primitives:Popup x:Name="CodeInfoPop" Grid.Row="0" Grid.Column="2"> 

    88. 
  
  
  88. 
            <StackPanel Width="200"> 

    89. 
  
  
  89. 
                <StackPanel.Style> 

    90. 
  
  
  90. 
                    <Style targettype="StackPanel"> 

    91. 
  
  
  91. 
                        <Setter Property="Background" Value="brown"></Setter> 

    92. 
  
  
  92. 
                    </Style> 

    93. 
  
  
  93. 
                </StackPanel.Style> 

    94. 
  
  
  94. 
                <StackPanel.Effect> 

    95. 
  
  
  95. 
                    <DropShadowEffect 

    96. 
  
  
  96. 
                    Color="Black" Direction="300" ShadowDepth="10" BlurRadius="5" Opacity="0.6"> 

    97. 
  
  
  97. 
                    </DropShadowEffect> 

    98. 
  
  
  98. 
                </StackPanel.Effect> 

    99. 
  
  
  99. 
                <StackPanel Orientation="Horizontal"> 

    100. 
  
  
  100. 
                    <TextBlock Text="{Binding Tb_Ename,Source={StaticResource CodeManageResource}}"/> 

    101. 
  
  
  101. 
                    <TextBlock Text="{Binding CodeEntity.ename}" Margin="5,0"/> 

    102. 
  
  
  102. 
                </StackPanel> 

    103. 
  
  
  103. 
                <StackPanel Orientation="Horizontal"> 

    104. 
  
  
  104. 
                    <TextBlock Text="{Binding Tb_CNm,Source={StaticResource CodeManageResource}}"/> 

    105. 
  
  
  105. 
                    <TextBlock Text="{Binding CodeEntity.cname}" Margin="5,0"/> 

    106. 
  
  
  106. 
                </StackPanel> 

    107. 
  
  
  107. 
                <StackPanel Orientation="Horizontal"> 

    108. 
  
  
  108. 
                    <TextBlock Text="{Binding Tb_display,Source={StaticResource CodeManageResource}}"/> 

    109. 
  
  
  109. 
                    <TextBlock Text="{Binding CodeEntity.display_content}" Margin="5,0"/> 

    110. 
  
  
  110. 
                </StackPanel> 

    111. 
  
  
  111. 
            </StackPanel> 

    112. 
  
  
  112. 
        </Primitives:Popup> 

    113. 
  
  
  113. 
    </Grid> 

    114. 
  
  
  114. 
</controls:ChildWindow> 

    115.

最普遍的布局方式Grid+StackPanel。记得上次好像我在写博客的时候，给每个控件都设置了FontSize，其实这个是没有必要的，只需要在controls:ChildWindow节点中设置，那么整个页面的控件的FontSize都起作用。再往下看，有这样的一些节点

<Style x:Key="buttonStyle" targettype="Button">...</Style>里面有这么一段代码

 
 
    

  1. <ControlTemplate targettype="Button"> 
    2. 
  
  
  2. 
                                                    <Border CornerRadius="2" BorderThickness="1" BorderBrush="Red"> 

    3. 
  
  
  3. 
                                                        <StackPanel Orientation="Horizontal" Background="Turquoise"> 

    4. 
  
  
  4. 
                                                            <StackPanel.Effect> 

    5. 
  
  
  5. 
                                                                <DropShadowEffect Color="Black" Direction="270" ShadowDepth="5"   

    6. 
  
  
  6. 
                                                                    BlurRadius="5" Opacity="0.5"> 

    7. 
  
  
  7. 
                                                                </DropShadowEffect> 

    8. 
  
  
  8. 
                                                            </StackPanel.Effect> 

    9. 
  
  
  9. 
                                                            <Image Source="/MISInfoManage;component/Images/drag.png" Height="25" Width="60"/> 

    10. 
  
  
  10. 
                                                            <TextBlock Text="修改" Foreground="brown" FontWeight="Bold"></TextBlock> 

    11. 
  
  
  11. 
                                                        </StackPanel> 

    12. 
  
  
  12. 
                                                    </Border> 

    13. 
  
  
  13. 
                                                </ControlTemplate> 

    14.

这个是定义一个Button的控件模版。在这里我们给StackPanel定义了一个特效DropShadowEffect ，一个阴影效果。在这个模板中我放置了一个图片和一个文本，大家看看上面的图就知道了。整个一按钮变成如此摸样，所以在我们做开发的时候，可以通过设置ControlTemplate来定制我们按钮或者其他控件的模版。在按钮中，我们只需要设置Style="{StaticResource buttonStyle}"即可。再往下走，有这么一段代码

<Primitives:Popup x:Name="CodeInfoPop" Grid.Row="0" Grid.Column="2">这个节点正是定义我们的Popup，当DataGrid的SelectionChanged触发时，弹出Popup。注意Popup这里需要引用System.Windows.Controls.Primitives。好了前台没什么，就这么些。我们看看页面后台，代码如下

 
 
    

  1. namespace MISInfoManage  
    2. 
  
  
  2. {  
    3. 
  
  
  3. 
    public partial class CodeManageView : ChildWindow  

    4. 
  
  
  4.     {  
    5. 
  
  
  5.         CodeManageModel codeManage;  
    6. 
  
  
  6. 
        public CodeManageView()  

    7. 
  
  
  7.         {  
    8. 
  
  
  8.             InitializeComponent();  
    9. 
  
  
  9. 
            codeManage = new CodeManageModel(this);  

    10. 
  
  
  10. 
            this.LayoutRoot.DataContext = codeManage;  

    11. 
  
  
  11.         }  
    12. 
  
  
  12.     }  
    13. 
  
  
  13. } 
    14.

我勒了个去，怎么就这么点代码，我告诉你，就这么点代码。我们这次使用了Behavior，那么就不会出现页面后台事件。看看viewmodel到底都干了些什么。

 
 
    

  1. namespace MISInfoManage.viewmodels  
    2. 
  
  
  2. {  
    3. 
  
  
  3. 
    public class CodeManageModel : INotifyPropertyChanged  

    4. 
  
  
  4.     {  
    5. 
  
  
  5. 
        public ChildWindow userControl;  

    6. 
  
  
  6.         CodeManageServiceClient client;  
    7. 
  
  
  7.         SelectionChangedBehavior mouseRightButtonBrhavior;  
    8. 
  
  
  8. 
        public CodeManageModel()  

    9. 
  
  
  9.         {  
    10. 
  
  
  10. 
            client = new CodeManageServiceClient();  

    11. 
  
  
  11. 
            this.GetCodesList((obj, args) =>  

    12. 
  
  
  12.             {  
    13. 
  
  
  13. 
                this.CodesList = args.Result;  

    14. 
  
  
  14. 
                this.BuildTree();  

    15. 
  
  
  15.             });  
    16. 
  
  
  16.         }  
    17. 
  
  
  17.  
    18. 
  
  
  18. 
        public CodeManageModel(ChildWindow userControl)  

    19. 
  
  
  19. 
            : this()  

    20. 
  
  
  20.         {  
    21. 
  
  
  21. 
            this.userControl = userControl;  

    22. 
  
  
  22. 
            this.mouseRightButtonBrhavior = new SelectionChangedBehavior(this);  

    23. 
  
  
  23. 
            mouseRightButtonBrhavior.Attach((userControl as CodeManageView).dgCodeList);  

    24. 
  
  
  24. 
            this.SetContextMenu();  

    25. 
  
  
  25.         }  
    26. 
  
  
  26.  
    27. 
  
  
  27. 
        private List<Codes> codesList;  

    28. 
  
  
  28. 
        public List<Codes> CodesList  

    29. 
  
  
  29.         {  
    30. 
  
  
  30. 
            get 

    31. 
  
  
  31.             {  
    32. 
  
  
  32. 
                return codesList;  

    33. 
  
  
  33.             }  
    34. 
  
  
  34. 
            set 

    35. 
  
  
  35.             {  
    36. 
  
  
  36.                 codesList = value;  
    37. 
  
  
  37. 
                NotifyPropertyChange("CodesList");  

    38. 
  
  
  38.             }  
    39. 
  
  
  39.         }  
    40. 
  
  
  40.  
    41. 
  
  
  41. 
        private List<Codes> codeList;  

    42. 
  
  
  42. 
        public List<Codes> CodeList  

    43. 
  
  
  43.         {  
    44. 
  
  
  44. 
            get 

    45. 
  
  
  45.             {  
    46. 
  
  
  46. 
                return codeList;  

    47. 
  
  
  47.             }  
    48. 
  
  
  48. 
            set 

    49. 
  
  
  49.             {  
    50. 
  
  
  50.                 codeList = value;  
    51. 
  
  
  51. 
                NotifyPropertyChange("CodeList");  

    52. 
  
  
  52.             }  
    53. 
  
  
  53.         }  
    54. 
  
  
  54.  
    55. 
  
  
  55. 
        private Codes codeEntity;  

    56. 
  
  
  56. 
        public Codes CodeEntity  

    57. 
  
  
  57.         {  
    58. 
  
  
  58. 
            set 

    59. 
  
  
  59.             {  
    60. 
  
  
  60.                 codeEntity = value;  
    61. 
  
  
  61. 
                NotifyPropertyChange("CodeEntity");  

    62. 
  
  
  62.             }  
    63. 
  
  
  63. 
            get 

    64. 
  
  
  64.             {  
    65. 
  
  
  65. 
                return codeEntity;  

    66. 
  
  
  66.             }  
    67. 
  
  
  67.         }  
    68. 
  
  
  68.  
    69. 
  
  
  69. 
        public void GetCodesList(EventHandler<GetCodeListCompletedEventArgs> handler)  

    70. 
  
  
  70.         {  
    71. 
  
  
  71.             client.GetCodeListCompleted += handler;  
    72. 
  
  
  72.             client.GetCodeListAsync();  
    73. 
  
  
  73.         }  
    74. 
  
  
  74.  
    75. 
  
  
  75. 
        public void GetCodeListByCondition(string ename, EventHandler<GetCodeListByConditionCompletedEventArgs> handler)  

    76. 
  
  
  76.         {  
    77. 
  
  
  77.             client.GetCodeListByConditionCompleted += handler;  
    78. 
  
  
  78.             client.GetCodeListByConditionAsync(ename);  
    79. 
  
  
  79.         }  
    80. 
  
  
  80.  
    81. 
  
  
  81. 
        public void BuildTree()  

    82. 
  
  
  82.         {  
    83. 
  
  
  83. 
            TreeViewItem mainitem = new TreeViewItem();  

    84. 
  
  
  84. 
            mainitem.Header = "系统参数";  

    85. 
  
  
  85. 
            mainitem.IsExpanded = true;  

    86. 
  
  
  86. 
            List<Codes> codeList = null;  

    87. 
  
  
  87. 
            if (this.CodesList != null && this.CodesList.Count > 0)  

    88. 
  
  
  88.             {  
    89. 
  
  
  89. 
                codeList = this.CodesList.distinct<Codes>(new EqualityCompare()).ToList();  

    90. 
  
  
  90.                 codeList.ForEach(c =>  
    91. 
  
  
  91.                 {  
    92. 
  
  
  92. 
                    TreeViewItem treeViewItem = new TreeViewItem();  

    93. 
  
  
  93. 
                    StackPanel stackPanel = new StackPanel();  

    94. 
  
  
  94.                     stackPanel.Orientation = Orientation.Horizontal;  
    95. 
  
  
  95. 
                    TextBlock textBlock = new TextBlock();  

    96. 
  
  
  96.                     textBlock.Text = c.cname;  
    97. 
  
  
  97.                     textBlock.Tag = c.ename;  
    98. 
  
  
  98. 
                    textBlock.MouseLeftButtonDown += this.LoadCodeByID;  

    99. 
  
  
  99. 
                    Image image = new Image();  

    100. 
  
  
  100.                     image.Width = 12;  
    101. 
  
  
  101.                     image.Height = 12;  
    102. 
  
  
  102. 
                    image.Margin = new Thickness(0, 0, 5, 0);  

    103. 
  
  
  103. 
                    image.source = new BitmapImage(new Uri("../Images/Windows.jpg", UriKind.Relative));  

    104. 
  
  
  104.                     stackPanel.Children.Add(image);  
    105. 
  
  
  105.                     stackPanel.Children.Add(textBlock);  
    106. 
  
  
  106.                     treeViewItem.Header = stackPanel;  
    107. 
  
  
  107.                     mainitem.Items.Add(treeViewItem);  
    108. 
  
  
  108.                 });  
    109. 
  
  
  109. 
                (this.userControl as CodeManageView).treeViewCode.Items.Add(mainitem);  

    110. 
  
  
  110.             }  
    111. 
  
  
  111.         }  
    112. 
  
  
  112.  
    113. 
  
  
  113. 
        private void LoadCodeByID(object sender, MouseButtonEventArgs e)  

    114. 
  
  
  114.         {  
    115. 
  
  
  115. 
            TextBlock textBlock = sender as TextBlock;  

    116. 
  
  
  116. 
            string ename = textBlock.Tag.ToString();  

    117. 
  
  
  117. 
            this.GetCodeListByCondition(ename, (obj, args) =>  

    118. 
  
  
  118.             {  
    119. 
  
  
  119. 
                this.CodeList = args.Result;  

    120. 
  
  
  120.             });  
    121. 
  
  
  121.         }  
    122. 
  
  
  122.  
    123. 
  
  
  123. 
        private void SetContextMenu()  

    124. 
  
  
  124.         {  
    125. 
  
  
  125. 
            ContextMenu contextMenu = new ContextMenu();  

    126. 
  
  
  126. 
            MenuItem menuItem = new MenuItem();  

    127. 
  
  
  127. 
            menuItem.Tag = "Modify";  

    128. 
  
  
  128. 
            TextBlock textBlock = new TextBlock();  

    129. 
  
  
  129. 
            textBlock.Text = "修改";  

    130. 
  
  
  130.             menuItem.Header = textBlock;  
    131. 
  
  
  131.             contextMenu.Items.Add(menuItem);  
    132. 
  
  
  132. 
            menuItem = new MenuItem();  

    133. 
  
  
  133. 
            textBlock = new TextBlock();  

    134. 
  
  
  134. 
            textBlock.Text = "添加";  

    135. 
  
  
  135. 
            menuItem.Tag = "Add";  

    136. 
  
  
  136.             menuItem.Header = textBlock;  
    137. 
  
  
  137.             contextMenu.Items.Add(menuItem);  
    138. 
  
  
  138. 
            menuItem = new MenuItem();  

    139. 
  
  
  139. 
            textBlock = new TextBlock();  

    140. 
  
  
  140. 
            textBlock.Text = "关闭";  

    141. 
  
  
  141. 
            menuItem.Tag = "Close";  

    142. 
  
  
  142.             menuItem.Header = textBlock;  
    143. 
  
  
  143. 
            menuItem.Click += delegate(object sender, RoutedEventArgs e)  

    144. 
  
  
  144.             {  
    145. 
  
  
  145. 
                (userControl as CodeManageView).Close();  

    146. 
  
  
  146.             };  
    147. 
  
  
  147.             contextMenu.Items.Add(menuItem);  
    148. 
  
  
  148. 
            ContextMenuService.SetContextMenu((this.userControl as CodeManageView).dgCodeList, contextMenu);  

    149. 
  
  
  149.         }  
    150. 
  
  
  150.  
    151. 
  
  
  151. 
        public event PropertyChangedEventHandler PropertyChanged;  

    152. 
  
  
  152. 
        private void NotifyPropertyChange(string property)  

    153. 
  
  
  153.         {  
    154. 
  
  
  154. 
            if (PropertyChanged != null)  

    155. 
  
  
  155.             {  
    156. 
  
  
  156. 
                PropertyChanged(this, new PropertyChangedEventArgs(property));  

    157. 
  
  
  157.             }  
    158. 
  
  
  158.         }  
    159. 
  
  
  159.     }  
    160. 
  
  
  160.  
    161. 
  
  
  161. 
    public class EqualityCompare : IEqualityComparer<Codes>  

    162. 
  
  
  162.     {  
    163. 
  
  
  163. 
        public bool Equals(Codes code1, Codes code2)  

    164. 
  
  
  164.         {  
    165. 
  
  
  165. 
            return code1.ename.Equals(code2.ename);  

    166. 
  
  
  166.         }  
    167. 
  
  
  167.  
    168. 
  
  
  168. 
        public int GetHashCode(Codes code)  

    169. 
  
  
  169.         {  
    170. 
  
  
  170. 
            return code.ename.GetHashCode();  

    171. 
  
  
  171.         }  
    172. 
  
  
  172.     }  
    173. 
  
  
  173. } 
    174.

首先进入构造函数，初始化我们的TreeView，初始化TreeView的时候有这么个代码codeList = this.CodesList.distinct<Codes>(new EqualityCompare()).ToList();去除List<T>重复。我们知道对象的值都一样，不代表对象一样。所以我们需要实现IEqualityComparer<T>接口，Equals方法确定你要distinct的规则，在这里就是Ename不相等。GetHashCode必须返回Ename的HashCode。再往下走，这么一段代码

 
 
    

  1. this.mouseRightButtonBrhavior = new SelectionChangedBehavior(this);  
    2. 
  
  
  2. 
            mouseRightButtonBrhavior.Attach((userControl as CodeManageView).dgCodeList); 

    3.

在这里使用到了Behavior，我们为DataGrid定义了一个行为，我们来看看这个行为

 
 
    

  1. namespace MISInfoManage.Behavior  
    2. 
  
  
  2. {  
    3. 
  
  
  3. 
    public class SelectionChangedBehavior : Behavior<DataGrid>  

    4. 
  
  
  4.     {  
    5. 
  
  
  5.         CodeManageModel _codeManageModel;  
    6. 
  
  
  6. 
        public SelectionChangedBehavior():base()  

    7. 
  
  
  7.         {}  
    8. 
  
  
  8. 
        public SelectionChangedBehavior(CodeManageModel codeManageModel)  

    9. 
  
  
  9. 
            : this()  

    10. 
  
  
  10.         {  
    11. 
  
  
  11.             _codeManageModel = codeManageModel;  
    12. 
  
  
  12.         }  
    13. 
  
  
  13. 
        protected override void OnAttached()  

    14. 
  
  
  14.         {  
    15. 
  
  
  15. 
            base.OnAttached();  

    16. 
  
  
  16. 
            this.Associatedobject.SelectionChanged += Associatedobject_SelectionChanged;  

    17. 
  
  
  17. 
            this.Associatedobject.MouseMove += Associatedobject_MouseMove;  

    18. 
  
  
  18.         }  
    19. 
  
  
  19.  
    20. 
  
  
  20. 
        protected override void OnDetaching()  

    21. 
  
  
  21.         {  
    22. 
  
  
  22. 
            base.OnDetaching();  

    23. 
  
  
  23. 
            this.Associatedobject.SelectionChanged -= Associatedobject_SelectionChanged;  

    24. 
  
  
  24. 
            this.Associatedobject.MouseMove -= Associatedobject_MouseMove;  

    25. 
  
  
  25.         }  
    26. 
  
  
  26.  
    27. 
  
  
  27. 
        private void Associatedobject_SelectionChanged(object sender, SelectionChangedEventArgs e)  

    28. 
  
  
  28.         {  
    29. 
  
  
  29. 
            if (_codeManageModel.CodeEntity != null)  

    30. 
  
  
  30.             {  
    31. 
  
  
  31. 
                Popup popup = (this._codeManageModel.userControl as CodeManageView).CodeInfoPop;  

    32. 
  
  
  32.                 popup.HorizontalOffset = 20;  
    33. 
  
  
  33.                 popup.VerticalOffset = 70;  
    34. 
  
  
  34. 
                popup.IsOpen = true;  

    35. 
  
  
  35.             }  
    36. 
  
  
  36.         }  
    37. 
  
  
  37.  
    38. 
  
  
  38. 
        private void Associatedobject_MouseMove(object sender,MouseEventArgs e)  

    39. 
  
  
  39.         {  
    40. 
  
  
  40. 
            Popup popup = (this._codeManageModel.userControl as CodeManageView).CodeInfoPop;  

    41. 
  
  
  41. 
            popup.IsOpen = false;  

    42. 
  
  
  42.         }  
    43. 
  
  
  43.     }  
    44. 
  
  
  44. } 
    45.

在这里我只说一个基类，其他的就不往出贴了，大家自己看

 
 
    

  1. namespace System.Windows.Interactivity  
    2. 
  
  
  2. {  
    3. 
  
  
  3. 
    // Summary:  

    4. 
  
  
  4. 
    //     Encapsulates state @R_708_4045@ion and zero or more ICommands into an attachable  

    5. 
  
  
  5. 
    //     object.  

    6. 
  
  
  6. 
    //  

    7. 
  
  
  7. 
    // Type parameters:  

    8. 
  
  
  8. 
    //   T:  

    9. 
  
  
  9. 
    //     The type the System.Windows.Interactivity.Behavior<T> can be attached to.  

    10. 
  
  
  10. 
    //  

    11. 
  
  
  11. 
    // Remarks:  

    12. 
  
  
  12. 
    //     Behavior is the base class for providing attachable state and commands to  

    13. 
  
  
  13. 
    //     an object.  The types the Behavior can be attached to can be controlled by  

    14. 
  
  
  14. 
    //     the generic parameter.  Override OnAttached() and OnDetaching() methods to  

    15. 
  
  
  15. 
    //     hook and unhook any necessary handlers from the Associatedobject.  

    16. 
  
  
  16. 
    public abstract class Behavior<T> : Behavior where T : System.Windows.DependencyObject  

    17. 
  
  
  17.     {  
    18. 
  
  
  18. 
        // Summary:  

    19. 
  
  
  19. 
        //     Initializes a new instance of the System.Windows.Interactivity.Behavior<T>  

    20. 
  
  
  20. 
        //     class.  

    21. 
  
  
  21. 
        protected Behavior();  

    22. 
  
  
  22.  
    23. 
  
  
  23. 
        // Summary:  

    24. 
  
  
  24. 
        //     Gets the object to which this System.Windows.Interactivity.Behavior<T> is  

    25. 
  
  
  25. 
        //     attached.  

    26. 
  
  
  26. 
        protected T Associatedobject { get; }  

    27. 
  
  
  27.     }  
    28. 
  
  
  28. } 
    29.

这里的的Associatedobject就是泛型T，并且它是System.Windows.DependencyObject类型的。Behavior类是个抽象类，具有Attach，Detach，OnAttached，OnDetaching方法。OnAttached在Attach方法调用以后生效。所以这段代码就实现了DataGrid的SelectionChanged和MouseMove事件，在SelectionChanged以后弹出Popup，MouseMove以后隐藏Popup。这种方式是不是很有效的实现了页面UI和逻辑的分离。再往下走，有个SetContextMenu方法，正是给DataGrid附加一个弹出菜单。在菜单构造好以后，需要调用ContextMenuService.SetContextMenu((this.userControl as CodeManageView).dgCodeList,contextMenu);，第一个参数是一个DependencyObject类型的对象，第二个是ContextMenu对象。类似于这样的内置对象还有FocusManager，它的方法FocusManager.GetFocusedElement()可以直接找到页面获得焦点的元素。我们来看看这个菜单的效果，

当我们点击关闭的时候，将会关闭该页面。OK，今天就讲到这里，时间也不早了，洗洗睡。

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