C# 按钮托管在2个控件中的绑定问题
嗨，我知道这是很多代码，但我希望有人能帮我或给我指出正确的方向我的导出到csv命令不会启动，即使在命令和任务上使用断点，所以我假设在数据上下文中找不到它。在这种情况下，其他一切都可以运行数据填充，编辑按钮工作。 因此，我有2个C# 按钮托管在2个控件中的绑定问题,c#,wpf,xaml,mvvm,data-binding,C#,Wpf,Xaml,Mvvm,Data Binding,嗨，我知道这是很多代码，但我希望有人能帮我或给我指出正确的方向我的导出到csv命令不会启动，即使在命令和任务上使用断点，所以我假设在数据上下文中找不到它。在这种情况下，其他一切都可以运行数据填充，编辑按钮工作。 因此，我有2个UserControlsTitleControl和BillOfMaterialsControl，我在标题控件中托管了一些按钮，这些按钮托管在BOM表控件中，似乎我的按钮不适用于托管在另一个控件中 我在输出窗口中遇到此错误： System.Windows.Data Error
UserControlTitleControlBillOfMaterialsControlSystem.Windows.Data Error: 40 : BindingExpression path error: 'ExportButtonCommand' property not found on 'object' ''TitleControl' (Name='')'. BindingExpression:Path=ExportButtonCommand; DataItem='TitleControl' (Name=''); target element is 'Button' (Name=''); target property is 'Command' (type 'ICommand')
<UserControl x:Class="Bright_Instruments.Controls.BillOfMaterialsControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Bright_Instruments.Controls"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800" xmlns:controls="clr-namespace:Bright_Instruments.Controls"
xmlns:iconPacks="http://metro.mahapps.com/winfx/xaml/iconpacks"
xmlns:Controls="http://metro.mahapps.com/winfx/xaml/controls">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<controls:TitleControl Grid.Column="0" Badge="{Binding Badge, RelativeSource={RelativeSource AncestorType=UserControl}}" Grid.Row="0" Margin="5" Text="PARTS LIST" Icon="{iconPacks:PicolIcons Kind=ListNumbered}">
<controls:TitleControl.TitleContent>
<StackPanel Margin="0" HorizontalAlignment="Right" Orientation="Horizontal">
<Button ToolTip="Print parts list" Margin="5" HorizontalAlignment="Right" Style="{DynamicResource MahApps.Styles.Button.Chromeless}">
<Button.Content>
<iconPacks:PackIconEntypo Kind="Print"/>
</Button.Content>
</Button>
<Button Margin="5"
Command="{Binding ExportButtonCommand, RelativeSource={RelativeSource AncestorType=UserControl}, UpdateSourceTrigger=PropertyChanged}" ToolTip="Export parts list to .csv" HorizontalAlignment="Right" Style="{DynamicResource MahApps.Styles.Button.Chromeless}">
<Button.Content>
<iconPacks:PackIconFontAwesome Kind="FileCsvSolid"/>
</Button.Content>
</Button>
<Button Margin="5" ToolTip="Export parts list to .pdf" HorizontalAlignment="Right" Style="{DynamicResource MahApps.Styles.Button.Chromeless}">
<Button.Content>
<iconPacks:PackIconFontAwesome Kind="FilePdfSolid"/>
</Button.Content>
</Button>
</StackPanel>
</controls:TitleControl.TitleContent>
</controls:TitleControl>
<StackPanel Orientation="Horizontal" Grid.Column="1">
<Button Margin="0, 5, 5, 5"
Command="{Binding EditButtonCommand, RelativeSource={RelativeSource AncestorType=UserControl}}"
Style="{DynamicResource MahApps.Styles.Button.Flat}"
Content="EDIT"/>
</StackPanel>
<DataGrid Grid.Row="1" AutoGenerateColumns="False" Grid.Column="0" Grid.ColumnSpan="2"
ItemsSource="{Binding BillOfMaterials, RelativeSource={RelativeSource AncestorType=UserControl}, UpdateSourceTrigger=PropertyChanged}" Margin="5" IsReadOnly="True" SelectionMode="Single">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Path=ChildItem.PartNumber}" Width="Auto">
<DataGridTextColumn.Header>
<StackPanel Orientation="Horizontal">
<iconPacks:PackIconFontAwesome Kind="WrenchSolid" Margin="5" />
<TextBlock Margin="5" Text="PART NUMBER"/>
</StackPanel>
</DataGridTextColumn.Header>
</DataGridTextColumn>
<DataGridTextColumn Binding="{Binding Path=ChildItem.Description}" Width="*">
<DataGridTextColumn.Header>
<StackPanel Orientation="Horizontal">
<iconPacks:PackIconMaterialDesign Kind="Description" Margin="5" />
<TextBlock Margin="5" Text="DESCRIPTION"/>
</StackPanel>
</DataGridTextColumn.Header>
<DataGridTextColumn.ElementStyle>
<Style>
<Setter Property="TextBlock.TextWrapping" Value="Wrap" />
<Setter Property="TextBlock.TextAlignment" Value="Left"/>
</Style>
</DataGridTextColumn.ElementStyle>
</DataGridTextColumn>
<DataGridTextColumn Binding="{Binding Path=ChildItem.Location}" Width="Auto">
<DataGridTextColumn.Header>
<StackPanel Orientation="Horizontal">
<iconPacks:PackIconMaterialDesign Kind="LocationOn" Margin="5" />
<TextBlock Margin="5" Text="LOCATION"/>
</StackPanel>
</DataGridTextColumn.Header>
</DataGridTextColumn>
<DataGridTextColumn Binding="{Binding Path=ChildItem.Quantity}" Width="Auto">
<DataGridTextColumn.Header>
<StackPanel Orientation="Horizontal">
<iconPacks:PackIconMaterial Kind="Numeric" Margin="5" />
<TextBlock Margin="5" Text="QUANTITY IN STOCK"/>
</StackPanel>
</DataGridTextColumn.Header>
</DataGridTextColumn>
<DataGridTextColumn Width="Auto" Binding="{Binding Path=Quantity}">
<DataGridTextColumn.Header>
<StackPanel Orientation="Horizontal">
<iconPacks:PackIconMaterial Kind="Numeric" Margin="5" />
<TextBlock Margin="5" Text="QUANTITY REQ"/>
</StackPanel>
</DataGridTextColumn.Header>
</DataGridTextColumn>
<DataGridTemplateColumn Width="Auto">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Button Margin="0" Style="{DynamicResource MahApps.Styles.Button.Flat}"
CommandParameter="{Binding }"
Command="{Binding ViewButtonCommand, RelativeSource={RelativeSource AncestorType=UserControl}}" Content="VIEW"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.Header>
<StackPanel Orientation="Horizontal">
<iconPacks:PackIconTypicons Margin="5" Kind="Eye"/>
<TextBlock Text="VIEW" Margin="5"/>
</StackPanel>
</DataGridTemplateColumn.Header>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
</UserControl>
<UserControl x:Class="Bright_Instruments.Controls.TitleControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Bright_Instruments.Controls"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800"
DataContext="{Binding RelativeSource={RelativeSource Self}}"
xmlns:Controls="http://metro.mahapps.com/winfx/xaml/controls">
<Grid Background="{DynamicResource MahApps.Brushes.Accent}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal" Grid.Row="0" Grid.Column="0">
<ContentPresenter Margin="5" Content="{Binding Icon}"
TextBlock.Foreground="{DynamicResource MahApps.Brushes.IdealForeground}" />
<TextBlock
Text="{Binding Text, UpdateSourceTrigger=PropertyChanged}"
FontSize="12" VerticalAlignment="Center"
HorizontalAlignment="Left" Background="Transparent"
Foreground="{DynamicResource MahApps.Brushes.IdealForeground}"
Padding="5"/>
<Controls:Badged BadgePlacementMode="TopRight" Margin="10, 0, 0, 0" Badge="{Binding Badge}">
<Controls:Badged.Style>
<Style TargetType="Controls:Badged">
<Style.Triggers>
<Trigger Property="Badge" Value="">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
</Style.Triggers>
</Style>
</Controls:Badged.Style>
</Controls:Badged>
</StackPanel>
<ContentPresenter Content="{Binding TitleContent, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1" Grid.Row="0"/>
<Rectangle Height="2" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" VerticalAlignment="Bottom" Fill="{DynamicResource MahApps.Brushes.AccentBase}">
</Rectangle>
</Grid>
</UserControl>
<controls:BillOfMaterialsControl
EditButtonCommand="{Binding EditPartsListCommand}"
Badge="{Binding PartsListCount}"
ViewButtonCommand="{Binding ViewPartsListItemCommand}"
ExportButtonCommand="{Binding ExportPartsListToCsvCommand, UpdateSourceTrigger=PropertyChanged}"
BillOfMaterials="{Binding BillOfMaterials, UpdateSourceTrigger=PropertyChanged}"/>
public ICommand ExportPartsListToCsvCommand => new AsyncRelayCommand(ExportPartsListToCsv);
public async Task ExportPartsListToCsv()
{
var saveFileDialog = new SaveFileDialog();
var filter = $"CSV (*.csv) | *.csv";
saveFileDialog.Filter = filter;
saveFileDialog.DefaultExt = ".csv";
saveFileDialog.FileName = "Inventory.csv";
if (saveFileDialog.ShowDialog() == true)
{
try
{
await CsvService.Write<BillOfMaterial>(saveFileDialog.FileName, BillOfMaterials);
}
catch (Exception ex)
{
SentrySdk.CaptureException(ex);
}
}
}
public ICommand exportPartsListToCsCommand=>new AsyncRelayCommand（ExportPartsListToCsv）；
公共异步任务ExportPartsListToCsv（）
{
var saveFileDialog=新建saveFileDialog（）；
变量过滤器=$“CSV（*.CSV）|*.CSV”；
saveFileDialog.Filter=Filter；
saveFileDialog.DefaultExt=“.csv”；
saveFileDialog.FileName=“Inventory.csv”；
if（saveFileDialog.ShowDialog（）==true）
{
尝试
{
等待CsvService.Write（saveFileDialog.FileName，BillOfMaterials）；
}
捕获（例外情况除外）
{
SentrySdk.CaptureException（ex）；
}
}
}
BillofMaterials控件使用标题控件
控件，该控件又包含一个按钮
，该按钮绑定导出按钮命令
（这是BillofMaterials控件
中的属性）作为命令。在这里，您使用一个相对源绑定，其中包含祖先类型UserControl
Command="{Binding ExportButtonCommand, RelativeSource={RelativeSource AncestorType=UserControl}, UpdateSourceTrigger=PropertyChanged}"
想象与此类似的视觉树（仅包含关键部分）
BillofMaterials控件
标题控制
按钮
相对源绑定将搜索可视化树，以查找类型为UserControl
的控件。这两个控件都派生自UserControl
，找到的第一个控件是TitleControl
，但此控件不包含名为ExportButtonCommand
的属性，这就是绑定失败
System.Windows.Data Error: 40 : BindingExpression path error: 'ExportButtonCommand' property not found on 'object' ''TitleControl' (Name='')'. BindingExpression:Path=ExportButtonCommand; DataItem='TitleControl' (Name=''); target element is 'Button' (Name=''); target property is 'Command' (type 'ICommand')
您可以通过以下方式之一解决此问题
- 修改绑定以使用控件的具体类型
BillOfMaterialsControl
作为祖先类型。这样标题控制
不匹配
Command="{Binding ExportButtonCommand, RelativeSource={RelativeSource AncestorType=local:BillOfMaterialsControl}, UpdateSourceTrigger=PropertyChanged}"
- 指定一个合适的选项，以便在搜索过程中跳过控件
Command="{Binding ExportButtonCommand, RelativeSource={RelativeSource AncestorType=UserControl, AncestorLevel=2}, UpdateSourceTrigger=PropertyChanged}"
2
的值应该起作用（如果不起作用，则调整它）。从上的存储级别
：
获取或设置要在FindAncestor模式下查找的祖先的级别。使用1表示最接近绑定目标元素的元素
非常感谢！！我使用了AncestorLevel 2，这解决了由于某种原因指定实际类型不起作用的问题，但第二个选项起作用了
Command="{Binding ExportButtonCommand, RelativeSource={RelativeSource AncestorType=local:BillOfMaterialsControl}, UpdateSourceTrigger=PropertyChanged}"
Command="{Binding ExportButtonCommand, RelativeSource={RelativeSource AncestorType=UserControl, AncestorLevel=2}, UpdateSourceTrigger=PropertyChanged}"