WPF中override ResourceDictionary中的设置的方法

当资源文件里改变了控件的样式时，在使用的地方如果想改变资源文件里修改的内容，会造成无法达到预期目的的结果。

以DataGrid为例，我在资源文件里，改变了默认的DataGrid的样式，其中我设置了IsReadOnly为True。在使用时，这将导致DataGrid的列不能编辑；可实际情况要求编辑功能，我们就会想到针对列设置IsReadOnly为false。

如代码里的注释掉的内容所示，在简单地引用资源文件，而不做处理时，是无法达到预期的。

正确的做法是：

引入通过引入新的Style，在Style的Setter里设置，来override资源文件里的设置；这样再针对每个列单独设置IsReadOnly就会起作用。

其中的原理还没有太明白，仅仅记录下处理方法。

 

界面

 1 <Window x:Class="learnwpf.MainWindow"
 2         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4         Title="MainWindow" Height="350" Width="525" WindowStartupLocation="CenterScreen">
 5     <Grid>
 6         <DataGrid x:Name="dg" AutoGenerateColumns="False"
 7                   CanUserAddRows="False" CanUserDeleteRows="False" CanUserReorderColumns="False"
 8                   CanUserResizeColumns="False" CanUserResizeRows="False" CanUserSortColumns="False">
 9             <!--以下这样的字典引用方式，将导致即使在DataGridTextColumn里设置IsReadOnly为false仍旧不能编辑-->
10             <!--<DataGrid.Resources>
11                 <ResourceDictionary Source="newlook/DataGrid.xaml" />
12             </DataGrid.Resources>-->
13             <!--解决办法如下，注意x:key的使用-->
14             <DataGrid.Resources>
15                 <ResourceDictionary>
16                     <ResourceDictionary.MergedDictionaries>
17                         <ResourceDictionary Source="newlook/DataGrid.xaml" />
18                         <ResourceDictionary>
19                             <Style TargetType="DataGrid">
20                                 <Setter Property="IsReadOnly" Value="False" />
21                             </Style>
22                         </ResourceDictionary>
23                     </ResourceDictionary.MergedDictionaries>
24                 </ResourceDictionary>
25             </DataGrid.Resources>
26             <DataGrid.Columns>
27                 <DataGridTextColumn x:Name="text" Header="文本" Binding="{Binding Name,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" IsReadOnly="True" />
28                 <DataGridTextColumn x:Name="combo" Header="选择" Binding="{Binding Class,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" />
29             </DataGrid.Columns>
30         </DataGrid>
31     </Grid>
32 </Window>

资源文件

  1 <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  2                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  3     
  4     <SolidColorBrush x:Key="GridHeaderForeground" Color="#333"/>
  5     <SolidColorBrush x:Key="GridHeaderLineBrush" Color="#FFCCCEDB"/>
  6     <SolidColorBrush x:Key="GridHeaderBackgroudBrush" Color="#FFE3E3E3"/>
  7     <SolidColorBrush x:Key="GridLineBrush" Color="#FFEFEFF2"/>
  8     <SolidColorBrush x:Key="GridDrakRow" Color="#FFF9F9F9"/>
  9     <SolidColorBrush x:Key="GridBorderBrush" Color="#FFCCCEDB"/>
 10 
 11     <Style x:Key="ColumnHeaderGripperStyle" TargetType="{x:Type Thumb}">
 12         <Setter Property="Width" Value="3" />
 13         <Setter Property="Background" Value="Transparent" />
 14         <Setter Property="Cursor" Value="SizeWE" />
 15         <Setter Property="Opacity" Value="0" />
 16     </Style>
 17 
 18     <Style TargetType="DataGrid">
 19         <Setter Property="Margin" Value="0"/>
 20         <Setter Property="CanUserResizeColumns" Value="True"/>
 21         <Setter Property="CanUserSortColumns" Value="False"/>
 22         <Setter Property="AutoGenerateColumns" Value="False"/>
 23         <Setter Property="CanUserResizeRows" Value="False"/>
 24         <Setter Property="SelectionMode" Value="Single"/>
 25         <Setter Property="RowHeaderWidth" Value="0"/>
 26         <Setter Property="CanUserAddRows" Value="False"/>
 27         <Setter Property="CanUserDeleteRows" Value="False"/>
 28         <Setter Property="IsReadOnly" Value="True"/>
 29         <Setter Property="Background" Value="AliceBlue" />
 30         <Setter Property="AlternationCount" Value="2" />
 31         <Setter Property="ClipToBounds" Value="True" />
 32         <Setter Property="BorderBrush" Value="{DynamicResource GridBorderBrush}" />
 33         <Setter Property="HorizontalGridLinesBrush" Value="{DynamicResource GridLineBrush}"/>
 34         <Setter Property="VerticalGridLinesBrush" Value="{DynamicResource GridLineBrush}"/>
 35     </Style>
 36 
 37     <Style TargetType="DataGridColumnHeader">
 38         <Setter Property="SnapsToDevicePixels" Value="True" />
 39         <Setter Property="Foreground" Value="{DynamicResource GridHeaderForeground}" />
 40         <Setter Property="Template">
 41             <Setter.Value>
 42                 <ControlTemplate TargetType="DataGridColumnHeader">
 43                     <Border x:Name="BackgroundBorder" BorderThickness="1,0,1,1" 
 44                             Margin="-1,0,0,0"
 45                             Background="{DynamicResource GridHeaderBackgroudBrush}"
 46                             BorderBrush="{DynamicResource GridHeaderLineBrush}" Width="Auto">
 47                         <Grid>
 48                             <Grid.ColumnDefinitions>
 49                                 <ColumnDefinition Width="*" />
 50                             </Grid.ColumnDefinitions>
 51                             <ContentPresenter  Margin="0,0,0,0" VerticalAlignment="Center" HorizontalAlignment="Center"/>
 52                             <Thumb x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" Style="{StaticResource ColumnHeaderGripperStyle}" />
 53                             <Thumb x:Name="PART_RightHeaderGripper" HorizontalAlignment="Right" Style="{StaticResource ColumnHeaderGripperStyle}" />
 54                         </Grid>
 55                     </Border>
 56                 </ControlTemplate>
 57             </Setter.Value>
 58         </Setter>
 59         <Setter Property="Height" Value="25"/>
 60     </Style>
 61 
 62     <Style TargetType="{x:Type DataGridRow}">
 63         <Setter Property="Background" Value="Beige" />
 64         <Setter Property="SnapsToDevicePixels" Value="true" />
 65         <Setter Property="Height" Value="24" />
 66         <Setter Property="Template">
 67             <Setter.Value>
 68                 <ControlTemplate TargetType="{x:Type DataGridRow}">
 69                     <Border x:Name="DGR_Border" SnapsToDevicePixels="True">
 70                         <VisualStateManager.VisualStateGroups>
 71                             <VisualStateGroup x:Name="CommonStates">
 72                                 <VisualState x:Name="Normal" />
 73                                 <VisualState x:Name="Unfocused_Selected">
 74                                     <Storyboard>
 75                                         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="DGR_Border" Storyboard.TargetProperty="Background">
 76                                             <DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{DynamicResource CtrlSelectedUnFocusBG}" />
 77                                         </ObjectAnimationUsingKeyFrames>
 78                                     </Storyboard>
 79                                 </VisualState>
 80                                 <VisualState x:Name="Normal_AlternatingRow">
 81                                     <Storyboard>
 82                                         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="DGR_Border" Storyboard.TargetProperty="Background">
 83                                             <DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{StaticResource GridDrakRow}" />
 84                                         </ObjectAnimationUsingKeyFrames>
 85                                     </Storyboard>
 86                                 </VisualState>
 87                                 <VisualState x:Name="MouseOver">
 88                                     <Storyboard>
 89                                         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="DGR_Border" Storyboard.TargetProperty="Background">
 90                                             <DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{DynamicResource CtrlMouseOverBG}" />
 91                                         </ObjectAnimationUsingKeyFrames>
 92                                     </Storyboard>
 93                                 </VisualState>
 94                                 <VisualState x:Name="Normal_Selected">
 95                                     <Storyboard>
 96                                         <ObjectAnimationUsingKeyFrames Storyboard.TargetName="DGR_Border" Storyboard.TargetProperty="Background">
 97                                             <DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{DynamicResource CtrlSelectedBG}" />
 98                                         </ObjectAnimationUsingKeyFrames>
 99                                     </Storyboard>
100                                 </VisualState>
101                             </VisualStateGroup>
102                         </VisualStateManager.VisualStateGroups>
103                         <SelectiveScrollingGrid>
104                             <SelectiveScrollingGrid.ColumnDefinitions>
105                                 <ColumnDefinition Width="Auto" />
106                                 <ColumnDefinition Width="*" />
107                             </SelectiveScrollingGrid.ColumnDefinitions>
108                             <SelectiveScrollingGrid.RowDefinitions>
109                                 <RowDefinition Height="*" />
110                                 <RowDefinition Height="Auto" />
111                             </SelectiveScrollingGrid.RowDefinitions>
112                             <DataGridCellsPresenter Grid.Column="1"
113                                       ItemsPanel="{TemplateBinding ItemsPanel}"
114                                       SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
115                             <DataGridDetailsPresenter Grid.Column="1"
116                                         Grid.Row="1"
117                                         Visibility="{TemplateBinding DetailsVisibility}"
118                                         SelectiveScrollingGrid.SelectiveScrollingOrientation=
119                   "{Binding AreRowDetailsFrozen, 
120                   ConverterParameter={x:Static SelectiveScrollingOrientation.Vertical},
121                   Converter={x:Static DataGrid.RowDetailsScrollingConverter}, 
122                   RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"/>
123                             <DataGridRowHeader Grid.RowSpan="2"
124                                  SelectiveScrollingGrid.SelectiveScrollingOrientation="Vertical"
125                                  Visibility="{Binding HeadersVisibility, 
126                   ConverterParameter={x:Static DataGridHeadersVisibility.Row}, 
127                   Converter={x:Static DataGrid.HeadersVisibilityConverter}, 
128                   RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" />
129                         </SelectiveScrollingGrid>
130                     </Border>
131                     <ControlTemplate.Triggers>
132                         <Trigger Property="IsSelected" Value="True">
133                             <Setter Property="Foreground" Value="Black" />
134                         </Trigger>
135                     </ControlTemplate.Triggers>
136                 </ControlTemplate>
137             </Setter.Value>
138         </Setter>
139     </Style>
140 
141 </ResourceDictionary>

逻辑

 1 using System.Collections.Generic;
 2 using System.Windows;
 3 
 4 namespace learnwpf
 5 {
 6     /// <summary>
 7     /// Interaction logic for MainWindow.xaml
 8     /// </summary>
 9     public partial class MainWindow : Window
10     {
11         public MainWindow()
12         {
13             InitializeComponent();
14             init();
15         }
16 
17         private class TestData
18         {
19             public string Name { get; set; }
20             public string Class { get; set; }
21         }
22 
23         private void init()
24         {
25             List<TestData> data = new List<TestData>()
26             {
27                 new TestData(){Name="first",Class="10"},
28                 new TestData(){Name="secon",Class="15"},
29             };
30             dg.ItemsSource = data;
31         }
32     }
33 }

 

posted @ 2015-10-21 17:59  warnet  阅读(1287)  评论(0)  编辑  收藏  举报