[英]How is WPF Data Binding using Object Data Source in Visual Studio 2010 done?
This is probably mostly a question about how to use the VS 2010 IDE tools in a way the Microsofties didn't specifically intend.这可能主要是关于如何以 Microsofties 没有特别打算的方式使用 VS 2010 IDE 工具的问题。 But since this is something I immediately tried without success.
但由于这是我立即尝试但没有成功的事情。
I have defined a .NET 4.0 WPF Application project with a simple class that looks like this:我已经定义了一个 .NET 4.0 WPF 应用程序项目,其中包含一个如下所示的简单类:
Public Class Class1
Public Property One As String = "OneString"
Public Property Two As String = "TwoString"
End Class
I then defined it as an "Object Data Source" in VS2010, using the IDE's "Add New Data Source..." feature.然后我在 VS2010 中将其定义为“对象数据源”,使用 IDE 的“添加新数据源...”功能。 This exposes the class members in a GUI element in the IDE as given in this image:
这将在 IDE 中的 GUI 元素中公开类成员,如下图所示:
(source: finitesolutions.com ) (来源: finitesolutions.com )
Dragging "Class1" from that tool to the surface of "Window1.xaml" in a default "WPF Application" results in the design view looking like this:将“Class1”从该工具拖到默认“WPF 应用程序”中的“Window1.xaml”表面会导致设计视图如下所示:
(source: finitesolutions.com ) (来源: finitesolutions.com )
And generated XAML like this:并生成这样的 XAML:
<Window x:Class="Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="133" Width="170" xmlns:my="clr-namespace:WpfApplication1" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
>
<Window.Resources>
<CollectionViewSource x:Key="Class1ViewSource" d:DesignSource="{d:DesignInstance my:Class1, CreateList=True}" />
</Window.Resources>
<Grid DataContext="{StaticResource Class1ViewSource}" HorizontalAlignment="Left" Name="Grid1" VerticalAlignment="Top">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Label Content="One:" Grid.Column="0" Grid.Row="0" HorizontalAlignment="Left" Margin="3" VerticalAlignment="Center" />
<TextBlock Grid.Column="1" Grid.Row="0" Height="23" HorizontalAlignment="Left" Margin="3" Name="OneTextBlock" Text="{Binding Path=One}" VerticalAlignment="Center" />
<Label Content="Two:" Grid.Column="0" Grid.Row="1" HorizontalAlignment="Left" Margin="3" VerticalAlignment="Center" />
<TextBlock Grid.Column="1" Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="3" Name="TwoTextBlock" Text="{Binding Path=Two}" VerticalAlignment="Center" />
</Grid>
Note the data bindings Text="{Binding Path=One}"
and Text="{Binding Path=Two}"
in the TextBlock
elements.请注意
TextBlock
元素中的数据绑定Text="{Binding Path=One}"
和Text="{Binding Path=Two}"
。
Code-behind for Window1.xaml has this in Window_Loaded
: Window_Loaded
代码隐藏在Window_Loaded
有这个:
Class Window1
Private m_c1 As New Class1
Private Sub Window1_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded
Dim Class1ViewSource As System.Windows.Data.CollectionViewSource = CType(Me.FindResource("Class1ViewSource"), System.Windows.Data.CollectionViewSource)
'Load data by setting the CollectionViewSource.Source property:
'Class1ViewSource.Source = [generic data source]
Me.DataContext = m_c1
End Sub
End Class
Running the application produces this output:运行应用程序会产生以下输出:
(source: finitesolutions.com ) (来源: finitesolutions.com )
The expected result was that "OneString" would appear next to "One" and "TwoString" next to "Two" in the running window.预期的结果是“OneString”将出现在运行窗口中的“One”旁边和“TwoString”旁边。
The question is: Why didn't this work?问题是:为什么这不起作用? What will work instead?
什么会起作用? If I put bindings in a DataTemplate, it works.
如果我将绑定放在 DataTemplate 中,它就可以工作。 Blend, with its sample data stuff, implied that this should work, but it doesn't.
Blend 及其示例数据内容暗示这应该有效,但事实并非如此。 I know I'm missing something pretty fundamental here;
我知道我在这里遗漏了一些非常基本的东西; what is it?
它是什么?
I found this answer relatively quickly, so I'll answer my own question.我相对较快地找到了这个答案,所以我将回答我自己的问题。
The generated XAML code contains this:生成的 XAML 代码包含以下内容:
<Grid DataContext="{StaticResource Class1ViewSource}"
Removing the DataContext="{StaticResource Class1ViewSource}"
removed something that had masked the Window.DataContext, and the binding worked.删除
DataContext="{StaticResource Class1ViewSource}"
删除了掩盖 Window.DataContext 的内容,并且绑定起作用了。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.