嗨,我是 WPF C# 的新手,我正在将 winform 应用程序转换为 WPF,我在数据绑定方面遇到了困难(我对绑定没有好主意)。我收到错误消息:
绑定表达式路径错误:在 'object' ' ' String' 上找不到 Classes 属性 HashCode = "" 目标元素是 'TextBlock'(Name =' '); 目标属性是文本(类型“字符串”)
请帮忙。谢谢
我正在使用 XML 文件并存储一个包含类(字符串值列表,如旋转、拖动)、坐标点列表和输出值的序列。这是我的数据库类。
public class Database
{
public BindingList<string> Classes { get; set; }
public BindingList<Sequence> Samples { get; set; }
public Database()
{
Classes = new BindingList<string>();
Samples = new BindingList<Sequence>();
}
public void Save(Stream stream)
{
var serializer = new XmlSerializer(typeof(BindingList<Sequence>));
serializer.Serialize(stream, Samples);
}
public void Load(Stream stream)
{
var serializer = new XmlSerializer(typeof(BindingList<Sequence>));
var samples = (BindingList<Sequence>)serializer.Deserialize(stream);
Classes.Clear();
foreach (string label in samples.First().Classes)
{
Classes.Add(label);
Console.WriteLine(" lets check out the classes ....." + label);
}
Samples.Clear();
foreach (Sequence sample in samples)
{
sample.Classes = Classes;
Samples.Add(sample);
Console.WriteLine(" lets check out the samples ....." + sample);
}
}
}
}
序列是这样的----------------
Sequence sample = new Sequence()
{
Classes = Classes,
SourcePath = sequence,
Output = classIndex
};
现在我有一个组合框,它从 BindingList 类和数据网格中获取值,从序列中获取值。XML 文件是
<Window x:Class="WpfLearnGUI.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="417" Width="608">
<DockPanel Width="Auto" Height="Auto" LastChildFill="True">
<DataGrid
DataContext="{Binding}" ItemsSource="{Binding }"
AutoGenerateColumns="false" Height="73"
Name="gridSamples" Width="Auto" HorizontalAlignment="Right" DockPanel.Dock="Right" VerticalAlignment="Top" IsEnabled="True">
<DataGrid.Columns>
<DataGridTextColumn
Header="Gesture" />
<DataGridTextColumn
Header="Class"
/>
</DataGrid.Columns>
</DataGrid>
<Grid Height="Auto" Name="grid1" Background="Coral" DockPanel.Dock="Bottom" Width="Auto" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="240*"/>
<ColumnDefinition Width="264*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ComboBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="105,0,0,0" Name="cbClasses" VerticalAlignment="Top" Width="120" DisplayMemberPath="Classes" SelectedValuePath="Classes" IsEditable="True" DataContext="{Binding}" ItemsSource="{Binding}" />
<Button Content="DataBase" Grid.Column="2" Grid.Row="2" Height="23" HorizontalAlignment="Left" Margin="53,1,0,0"
Name="button5" VerticalAlignment="Top" Width="75" >
<Button.ContextMenu>
<ContextMenu>
<Menu>
<MenuItem Header="_Open" IsCheckable="True" Click="Open_click"></MenuItem>
</Menu>
</ContextMenu>
</Button.ContextMenu>
</Button>
</Grid>
</DockPanel>
</Window>
我像这样在 mainWindow 中绑定这两个值。
database = new Database();
cbClasses.ItemsSource = database.Classes;
gridSamples.DataContext = database.Samples;