6WPF---数据绑定属性与验证

绑定：描述一种关系，通过某种关系将多个事物联系在一起。

目标Targer:界面对象属性（必须是依赖属性）

源Source:需要在界面上做交互关联的数据对象

作用：将页面对象的某个属性与数据源建立联系，通过绑定可以将界面与数据逻辑进行隔离

1.绑定值转换器

2.绑定表达式的辅助属性

3.异常捕获

1）依赖属性异常捕获

 

 2）属性异常捕获

 

 

 3）ValidationRule异常捕获，自定义异常

 

4.IDataErrorInfo提示

 

5.Demo[应用IDataErrorInfo]

<Window x:Class="WPF数据绑定Demo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WPF数据绑定Demo"
        mc:Ignorable="d"
        SizeToContent="Height"
        Title="MainWindow" MinHeight="550" Width="800">
           
    <Window.DataContext>
        <local:Data/>
    </Window.DataContext>
    <Window.Resources>
        <Style TargetType="TextBlock">
            <Setter Property="VerticalAlignment" Value="Center"/>
            <Setter Property="FontSize" Value="12"/>
        </Style>
        
        <ControlTemplate x:Key="TextBoxErrorTemplate">
            <AdornedElementPlaceholder/>
        </ControlTemplate>

        <Style TargetType="TextBox">
            <Setter Property="Margin" Value="0,5"/>
            <Setter Property="Width" Value="500"/>
            <Setter Property="HorizontalAlignment" Value="Left"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TextBox}">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition MinHeight="30"/>
                                <RowDefinition Height="auto"/>
                            </Grid.RowDefinitions>
                            <Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}"
                                    BorderThickness="{TemplateBinding BorderThickness}"
                                    Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
                                <ScrollViewer x:Name="PART_ContentHost" Focusable="False" HorizontalScrollBarVisibility="Hidden"
                                              VerticalScrollBarVisibility="Hidden" VerticalContentAlignment="Center"
                                              BorderThickness="0"/>
                            </Border>
                            <TextBlock Text="{Binding Path=(Validation.Errors)[0].ErrorContent,
                                RelativeSource={RelativeSource Mode=TemplatedParent},
                                StringFormat=*{0}}"
                                       Grid.Row="1" Foreground="Red" Margin="0,3" FontSize="12" Visibility="Collapsed"
                                       Name="errorText"/>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="Validation.HasError" Value="True">
                                <Setter Property="BorderBrush" Value="Red" TargetName="border"/>
                                <Setter Property="Visibility" Value="Visible" TargetName="errorText"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Validation.ErrorTemplate" Value="{StaticResource TextBoxErrorTemplate}"/>
        </Style>

        <Style TargetType="ComboBox">
            <Setter Property="Height" Value="28"/>
            <Setter Property="Width" Value="500"/>
            <Setter Property="Margin" Value="0,5"/>
            <Setter Property="HorizontalAlignment" Value="Left"/>
        </Style>

        <Style TargetType="Button">
            <Setter Property="Height" Value="28"/>
            <Setter Property="Width" Value="80"/>
            <Setter Property="Margin" Value="5,0"/>
        </Style>
    </Window.Resources>
    <Grid Margin="30">
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="28"/>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="28"/>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="28"/>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="28"/>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="28"/>
            <RowDefinition/>
            <RowDefinition Height="auto"/>
        </Grid.RowDefinitions>
        <TextBlock Text="配置新项目" FontSize="22"/>
        <TextBlock Text="WPF应用程序" Grid.Row="1" FontSize="16" Margin="0,15"/>
        <TextBlock Text="项目名称" Grid.Row="2"/>
        <TextBox Grid.Row="3" Text="{Binding ProjectName,UpdateSourceTrigger=PropertyChanged,ValidatesOnDataErrors=True}"/>
        <TextBlock Grid.Row="4" Text="位置"/>
        <ComboBox Grid.Row="5"/>
        <TextBlock Text="解决方案" Grid.Row="6"/>
        <TextBlock Grid.Row="7"/>
        <TextBlock Text="解决方案名称" Grid.Row="8"/>
        <TextBox Grid.Row="9" Text="{Binding SolutionName,UpdateSourceTrigger=PropertyChanged,ValidatesOnDataErrors=True}"/>
        <CheckBox Content="将解决方案和项目放在同一个目录中" Grid.Row="10"
                  VerticalAlignment="Center"/>
        <StackPanel Orientation="Horizontal" Grid.Row="12" HorizontalAlignment="Right">
            <Button Content="上一步"/>
            <Button Content="下一步"/>
        </StackPanel>
    </Grid>
</Window>