使用INotifyPropertyChanged刷新数据绑定数据网格？

Question

我在WPF中创建了一个数据绑定数据网格：'ActionResults'，当我运行应用程序时它显示数据库表的内容。

I.T部门。将要手动更新SQL Server Management Studio中的'ActionResult'表。如果对表进行了任何更改，则只有在重新启动应用程序后，它们才会显示在datagrid中。我想添加一个“更新”按钮，它将重新刷新数据网格，显示对表格所做的任何更改。

我以前试图做一个黑客的东西，如

actionResultsDataGrid.Items.Refresh(); 

但决定去与的ObservableCollection。所以我一直在遵循http://www.youtube.com/watch?v=7CKB44Mc4Q0教程，唯一的问题是他手动创建他的记录，我将使用数据库。这里是我到目前为止：

//XAML 
<Window x:Class="WpfApplication2.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="MainWindow" Height="350" Width="525" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:my="clr-namespace:WpfApplication2" Loaded="Window_Loaded"> 
    <Window.Resources> 
     <CollectionViewSource x:Key="actionResultsViewSource" d:DesignSource="{d:DesignInstance my:ActionResult, CreateList=True}" /> 
    </Window.Resources> 
    <Grid DataContext="{StaticResource actionResultsViewSource}"> 
     <DataGrid AutoGenerateColumns="True" EnableRowVirtualization="True" ItemsSource="{Binding}" Name="actionResultsDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" Margin="0,0,0,85"> 
      <DataGrid.Columns> 
       <DataGridTextColumn x:Name="idColumn" Binding="{Binding Path=Id}" Header="Id" Width="SizeToHeader" /> 
       <DataGridTextColumn x:Name="actionColumn" Binding="{Binding Path=Action}" Header="Action" Width="SizeToHeader" /> 
     </DataGrid> 
     <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="388,253,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" /> 
    </Grid> 
</Window> 

然后我创建了使用INotifyPropertyChanged的更新一个ActionResult类。

public class ActionResults : INotifyPropertyChanged 
{ 
    public event PropertyChangedEventHandler PropertyChanged; 

    private void NotifyPropertyChanged(string propertyName) 
    { 
     if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
    } 

    private int _Id; 
    public int Id 
    { 
     get { return _Id; } 
     set 
     { 
      _Id = value; 
      NotifyPropertyChanged("Id"); 
     } 
    } 

    private string _Action; 
    public string Action 
    { 
     get { return _Action; } 
     set 
     { 
      _Action = value; 
      NotifyPropertyChanged("Action"); 
     } 
    } 

在MainWindow.xaml.cs

和我的按钮

private void button1_Click(object sender, RoutedEventArgs e) 
{ 

} 

我的问题，从以下该教程他随后创建了另一个类的ActionResults_'和手动添加的记录是，但我现在用的是数据库表。我从这里做什么？请告知我卡住了。可观察收藏的来源在哪里？

谢谢

编辑

private void Load_ActionResult_Table() 
    { 
     ActionResultsTable.ActionResultDataSet actionResultDataSet = ((ActionResultsTable.ActionResultDataSet)(this.FindResource("actionResultDataSet"))); 
     // Load data into the table ActionResult. You can modify this code as needed. 
     ActionResultsTable.ActionResultDataSetTableAdapters.ActionResultTableAdapter actionResultDataSetActionResultTableAdapter = new ActionResultsTable.ActionResultDataSetTableAdapters.ActionResultTableAdapter(); 
     actionResultDataSetActionResultTableAdapter.Fill(actionResultDataSet.ActionResult); 
     System.Windows.Data.CollectionViewSource actionResultViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("actionResultViewSource"))); 
     actionResultViewSource.View.MoveCurrentToFirst(); 
    } 

    private void Refresh_Table_Button_Click(object sender, RoutedEventArgs e) 
    { 
     //SO DO I NEED TO SAY, SET TABLE TO NULL THEN RELOAD BY USING BELOW FUNCTION? 
     Load_ActionResult_Table(); 
    } 

Answer 1

我提出以下几点建议，更简单的方法：

1. 移动从数据库中读取数据，一个单独的方法的代码。
2. 在开始处添加对ObservableCollection.Clear的调用。
3. 在应用程序启动和按钮单击事件处理程序中调用方法。

---

基于编辑，最简单的方法是将填充它之前清除数据表：

private void Load_ActionResult_Table() 
{ 
    ActionResultsTable.ActionResultDataSet actionResultDataSet = ((ActionResultsTable.ActionResultDataSet)(this.FindResource("actionResultDataSet"))); 
    // Load data into the table ActionResult. You can modify this code as needed. 
    ActionResultsTable.ActionResultDataSetTableAdapters.ActionResultTableAdapter actionResultDataSetActionResultTableAdapter = new ActionResultsTable.ActionResultDataSetTableAdapters.ActionResultTableAdapter(); 
    // Clear the table 
    actionResultDataSet.ActionResult.Clear(); 
    actionResultDataSetActionResultTableAdapter.Fill(actionResultDataSet.ActionResult); 
    System.Windows.Data.CollectionViewSource actionResultViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("actionResultViewSource"))); 
    actionResultViewSource.View.MoveCurrentToFirst(); 
}