基於DataTable值爲DataGrid行着色

Question

我從CSV文件中提取數據，在DataTable中解析數據，然後將此DataTable設置爲DataGrid的ItemsSource。然後，我循環DataTable對數據進行一些驗證，並且我想相應地爲DataGrid行着色。

問題是，我找不到相應的DataGrid行基於DataTable行。

這裏是我的代碼：

Dim dg As New DataGrid 
Dim dataTable as DataTable = ParseFile(filePath) 
Dim statutList() As String = {"Saisi", "Validé", "Suspendu", "Annulé"} 

dg.ItemsSource = dataTable.DefaultView 

For Each row As DataRow In dataTable.Rows 
    'This line is what I tried, but it always returns nothing 
    Dim dgrow As DataGridRow = dg.ItemContainerGenerator.ContainerFromItem(row) 
    If Not statutList.Contains(row("Statut").ToString) Then 
     dgrow.Background = Brushes.Red 
    End If 
Next 

的問題來自於這條線，它不工作：

Dim dgrow As DataGridRow = dg.ItemContainerGenerator.ContainerFromItem(row) 

SOLUTION：

兩個MM8解決方案的工作。就我而言，我用：

dg.UpdateLayout() 
For Each row As DataRowView In dg.Items.OfType(Of DataRowView) 
    Dim dgrow As DataGridRow = dg.ItemContainerGenerator.ContainerFromItem(row) 
    If Not statutList.Contains(row("Statut").ToString) Then 
     dgrow.Background = Brushes.Red 
    End If 
Next 

Answer 1

這樣做，這將是定義與設置該行的背景顏色的一個或多個數據觸發一個RowStyle的正確「WPF」方式時，該「Statut」列特定的行返回任何特定的值（一個或多個），例如：

<DataGrid x:Name="dg"> 
    <DataGrid.Resources> 
     <SolidColorBrush x:Key="color" Color="Red" /> 
    </DataGrid.Resources> 
    <DataGrid.RowStyle> 
     <Style TargetType="DataGridRow"> 
      <Style.Triggers> 
       <DataTrigger Binding="{Binding Statut}" Value="Saisi"> 
        <Setter Property="Background" Value="{StaticResource color}" /> 
       </DataTrigger> 
       <DataTrigger Binding="{Binding Statut}" Value="Validé"> 
        <Setter Property="Background" Value="{StaticResource color}" /> 
       </DataTrigger> 
       <DataTrigger Binding="{Binding Statut}" Value="Suspendu"> 
        <Setter Property="Background" Value="{StaticResource color}" /> 
       </DataTrigger> 
       <DataTrigger Binding="{Binding Statut}" Value="Annulé"> 
        <Setter Property="Background" Value="{StaticResource color}" /> 
       </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </DataGrid.RowStyle> 
</DataGrid> 

您當前的代碼隱藏方法都會好的工作，如果你稍微修改：

For Each row As DataRowView In dg.Items.OfType(Of DataRowView) 
     Dim dgrow As DataGridRow = dg.ItemContainerGenerator.ContainerFromItem(row) 
     If Not statutList.Contains(row("Statut").ToString) Then 
      dgrow.Background = Brushes.Red 
     End If 
    Next 

注意，ItemContain erGenerator.ContainerFromItem方法實際上不會返回可能已經被虛擬化掉項的DataGridRow容器如果DataTable包含很多行，你有沒有禁用虛擬化的用戶界面：

<DataGrid x:Name="dg" VirtualizingPanel.IsVirtualizing="False">. 

顯然禁用虛擬化可能會導致如果DataTable包含很多行，則會導致性能問題。

另請注意，一旦容器實際創建完畢，需要執行代碼，例如發生窗口的Loaded事件時。

Class MainWindow 
    Dim statutList() As String = {"Saisi", "Validé", "Suspendu", "Annulé"} 

    Public Sub New() 

     ' This call is required by the designer. 
     InitializeComponent() 

     ' Add any initialization after the InitializeComponent() call. 
     Dim dg As New DataGrid 
     Dim dataTable As DataTable = ParseFile(filePath) 

     dg.ItemsSource = dataTable.DefaultView 
    End Sub 

    Private Sub Window_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded 
     For Each row As DataRowView In dg.Items.OfType(Of DataRowView) 
      Dim dgrow As DataGridRow = dg.ItemContainerGenerator.ContainerFromItem(row) 
      If Not statutList.Contains(row("Statut").ToString) Then 
       dgrow.Background = Brushes.Red 
      End If 
     Next 
    End Sub 
    ... 
End Class