Question

我正在努力将数据集与WPF数据网格一起使用。绑定和填充网格非常容易，只需创建数据集数据源并将其拖到窗口上即可。瞧！但是当我尝试从数据集中附加RowChanged事件时，我收到错误：

已经有一个与此命令关联的打开DataReader，必须先关闭它。

当我在事件处理程序中放置一个断点时，由于某种原因，它会被调用两次（至少），并且在第二次调用时，上面的描述会发生异常。我多次调用它是没有意义的。

我已经读过我可以在我的连接字符串中添加“MultipleActiveResultSets = true”，但这感觉就像我正在使用SqlServer功能错误地掩盖了我做错的事情。

这是我的XAML：

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:local="clr-namespace:Test" x:Class="Test.MainWindow"
        Title="MainWindow" Height="350" Width="1141" Loaded="Window_Loaded">
    <Window.Resources>
        <local:SentinelDBDataSet x:Key="sentinelDBDataSet"/>
        <CollectionViewSource x:Key="changeEventViewSource" Source="{Binding ChangeEvent, Source={StaticResource sentinelDBDataSet}}"/>
    </Window.Resources>
    <Grid DataContext="{StaticResource changeEventViewSource}">
        <DataGrid x:Name="changeEventDataGrid" AutoGenerateColumns="False" EnableRowVirtualization="True" ItemsSource="{Binding}" Margin="0
                  " RowDetailsVisibilityMode="VisibleWhenSelected">
            <DataGrid.Columns>
                <DataGridTextColumn x:Name="cameraIDColumn" Binding="{Binding CameraID}" Header="Camera ID" Width="SizeToHeader" IsReadOnly="True"/>
                <!--<DataGridTextColumn x:Name="changeEventIDColumn" Binding="{Binding ChangeEventID}" Header="Change Event ID" IsReadOnly="True" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="backgroundID_RefColumn" Binding="{Binding BackgroundID_Ref}" Header="Background ID Ref" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="backgroundID_ChangeColumn" Binding="{Binding BackgroundID_Change}" Header="Background ID Change" Width="SizeToHeader"/>-->
                <DataGridTemplateColumn x:Name="timeStampColumn" Header="Time Stamp" Width="SizeToHeader" IsReadOnly="True">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <DatePicker SelectedDate="{Binding TimeStamp, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>

                <DataGridTextColumn x:Name="annotationColumn" Binding="{Binding Annotation}" Header="Annotation" Width="SizeToHeader" IsReadOnly="False"/>
                <DataGridCheckBoxColumn x:Name="validatedColumn" Binding="{Binding Validated}" Header="Validated" Width="SizeToHeader" IsReadOnly="True"/>
                <DataGridTextColumn x:Name="confidenceColumn" Binding="{Binding Confidence}" Header="Confidence" Width="SizeToHeader" IsReadOnly="True"/>
                <!--<DataGridCheckBoxColumn x:Name="focusChangedColumn" Binding="{Binding FocusChanged}" Header="Focus Changed" Width="SizeToHeader"/>-->
                <DataGridCheckBoxColumn x:Name="focusDeltaChangedColumn" Binding="{Binding FocusDeltaChanged}" Header="Focus Delta Changed" Width="SizeToHeader" IsReadOnly="True"/>
                <!--<DataGridCheckBoxColumn x:Name="brightnessChangedColumn" Binding="{Binding BrightnessChanged}" Header="Brightness Changed" Width="SizeToHeader"/>-->
                <DataGridCheckBoxColumn x:Name="correlationChangedColumn" Binding="{Binding CorrelationChanged}" Header="Correlation Changed" Width="SizeToHeader" IsReadOnly="True"/>
                <DataGridCheckBoxColumn x:Name="edgeCorrelationChangedColumn" Binding="{Binding EdgeCorrelationChanged}" Header="Edge Correlation Changed" Width="SizeToHeader" IsReadOnly="True"/>
                <DataGridCheckBoxColumn x:Name="edgeDensityChangedColumn" Binding="{Binding EdgeDensityChanged}" Header="Edge Density Changed" Width="SizeToHeader" IsReadOnly="True"/>
            </DataGrid.Columns>
        </DataGrid>

    </Grid>
</Window>

这是我的MainWindow课程：

 public partial class MainWindow : Window
    {
        SentinelDBDataSet dataset;
        SentinelDBDataSetTableAdapters.ChangeEventTableAdapter adapter;

        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            dataset = ((Test.SentinelDBDataSet)(this.FindResource("sentinelDBDataSet")));

            // Load data into the table ChangeEvent. You can modify this code as needed.            
            adapter = new Test.SentinelDBDataSetTableAdapters.ChangeEventTableAdapter();            
            adapter.Fill(dataset.ChangeEvent);

            System.Windows.Data.CollectionViewSource changeEventViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("changeEventViewSource")));
            changeEventViewSource.View.MoveCurrentToFirst();

            dataset.ChangeEvent.RowChanged += ChangeEvent_RowChanged;

        }

        void ChangeEvent_RowChanged(object sender, System.Data.DataRowChangeEventArgs e)
        {            
            adapter.Update(dataset.ChangeEvent);            
        }
    }

任何建议都将不胜感激。如果有一个更好的控件用于与DataSet交互，我愿意看看WPF带来的任何东西。不幸的是，该项目不支持使用Infragistics等商业工具。

布赖恩

WPF数据网格和数据集行绑定已更改事件

0 个答案: