WPF DataGrid SelectAll Button出現一次DataGrid加載

Question

我是WPF的新手，我正在使用WPF和DataGrid顯示DataTable的項目。

我有列和行標題可見，我的問題是，直到調用WPF窗口的方法完成後，DataGrid左上方的SelectAll按鈕纔會出現。這會導致列標題未對齊，直到出現SelectAll按鈕。

我已經在一個非常簡單的項目中重新創建了該問題。

我可以在設計模式下看到SelectAll按鈕，結果仍然相同。任何人都可以幫忙嗎？下面的圖片展示了我正在談論的內容。

我的XAML如下其次它背後的C＃創建數據表

<Window 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    x:Class="WpfApplication1.MainWindow" 
    mc:Ignorable="d" 
    Title="MainWindow" Height="450px" Width="800px"> 
<Window.Resources> 
    <Style TargetType="{x:Type Button}" 
      x:Key="{ComponentResourceKey ResourceId=DataGridSelectAllButtonStyle, TypeInTargetAssembly={x:Type DataGrid}}"> 
     <Setter Property="Template"> 
      <Setter.Value> 
       <ControlTemplate TargetType="{x:Type Button}"> 
        <Grid> 
         <VisualStateManager.VisualStateGroups> 
          <VisualStateGroup x:Name="CommonStates"> 
           <VisualState x:Name="Normal"/> 
           <VisualState x:Name="MouseOver"/> 
           <VisualState x:Name="Pressed"/> 
           <VisualState x:Name="Disabled"> 
            <Storyboard> 
             <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" 
                     Storyboard.TargetName="Arrow"> 
              <DiscreteObjectKeyFrame KeyTime="0" 
                    Value="{x:Static Visibility.Collapsed}" /> 
             </ObjectAnimationUsingKeyFrames> 
            </Storyboard> 
           </VisualState> 
          </VisualStateGroup> 
         </VisualStateManager.VisualStateGroups> 

         <Rectangle x:Name="Border" 
            SnapsToDevicePixels="True"> 
          <Rectangle.Stroke> 
           <LinearGradientBrush EndPoint="0.5,1" 
                StartPoint="0.5,0"> 
            <GradientStop Color="{DynamicResource BorderLightColor}" 
                Offset="0" /> 
            <GradientStop Color="{DynamicResource BorderMediumColor}" 
                Offset="1" /> 
           </LinearGradientBrush> 
          </Rectangle.Stroke> 
          <Rectangle.Fill> 
           <LinearGradientBrush EndPoint="0.5,1" 
                StartPoint="0.5,0"> 
            <GradientStop Color="{DynamicResource BorderLightColor}" 
                Offset="0" /> 
            <GradientStop Color="{DynamicResource BorderMediumColor}" 
                Offset="1" /> 
           </LinearGradientBrush> 
          </Rectangle.Fill> 
         </Rectangle> 

         <Polygon x:Name="Arrow" 
           HorizontalAlignment="Right" 
           Margin="8,8,3,3" 
           Opacity="0.55" 
           Points="0,10 10,10 10,0" 
           Stretch="Uniform" 
           VerticalAlignment="Bottom"> 
          <Polygon.Fill> 
           <SolidColorBrush Color="White" /> 
          </Polygon.Fill> 
         </Polygon> 
        </Grid> 
       </ControlTemplate> 
      </Setter.Value> 
     </Setter> 
    </Style> 

</Window.Resources> 

<Grid > 
    <Grid.ColumnDefinitions> 
     <ColumnDefinition Width="73*"/> 
     <ColumnDefinition Width="502*"/> 
     <ColumnDefinition Width="120"/> 
     <ColumnDefinition Width="120"/> 

    </Grid.ColumnDefinitions> 
    <Grid.RowDefinitions> 
     <RowDefinition Height="25"/> 
     <RowDefinition Height="*"/> 
     <RowDefinition Height="30"/> 
     <RowDefinition Height="20"/> 
    </Grid.RowDefinitions> 
    <Button x:Name="BtnImport" Content="Import" Grid.Row="2" Grid.Column="3" Height="20" Width="100"> 
     <Button.ToolTip> 
      <ToolTip> 
       <StackPanel> 
        <TextBlock FontWeight="BOLD"><Run Text="Import to AutoCAD"/></TextBlock> 
        <TextBlock><Run Text="Click or press ALT+ENTER"/></TextBlock> 
       </StackPanel> 
      </ToolTip> 
     </Button.ToolTip> 
    </Button> 
    <Button x:Name="BtnCancel" Content="Cancel" Grid.Row="2" Grid.Column="2" Height="20" Width="100"> 

     <Button.ToolTip> 
      <ToolTip> 
       <StackPanel> 
        <TextBlock FontWeight="BOLD"><Run Text="Cancel"/></TextBlock> 
        <TextBlock><Run Text="Click or press ESCAPE"/></TextBlock> 
       </StackPanel> 
      </ToolTip> 
     </Button.ToolTip> 
    </Button> 
    <StatusBar Grid.Row="3" Grid.ColumnSpan="4" Grid.Column="0"> 
     <StatusBarItem > 
      <TextBlock x:Name="AppsVer"><Run Text="AppsVer"/></TextBlock> 
     </StatusBarItem> 
    </StatusBar> 

    <DataGrid x:Name="ExportGrid" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="4" ColumnHeaderHeight="50" HeadersVisibility="All" 
       AutoGenerateColumns="True" RowHeaderWidth="40"/> 
</Grid> 

using System.Data; 

namespace WpfApplication1 
{ 
    public partial class MainWindow 
    { 
    public MainWindow() 
    { 
     InitializeComponent(); 

     ExportGrid.ItemsSource = MakeTable().DefaultView; 
    } 

    public static DataTable MakeTable() 
    { 
     var tbl = new DataTable(); 

     for (int i = 1; i < 5; i++) 
     { 
      tbl.Columns.Add("Column" + i, typeof(int)); 
     } 

     for (int j = 0; j <= 30; j++) 
     { 
      var nuRow = tbl.NewRow(); 
      for (int k = 0; k < 4; k++) 
      { 

       nuRow[k] = j; 
      } 
      tbl.Rows.Add(nuRow); 
     } 
     return tbl; 
    } 
    } 
} 

Answer 1

我無法重現您的問題按照你描述的方式。

但根據你的描述，它可能是一個解決方案，用一種異步方法填充網格。在這種情況下，視圖不會阻塞，直到方法結束並且網格應該正確繪製。

我添加了一個代碼段，這將填補電網異步：

public partial class MainWindow : Window 
    { 
     public MainWindow() 
     { 
      InitializeComponent(); 
      MakeTable(); 
     } 

     public async void MakeTable() 
     { 
      var task = await Task<DataTable>.Factory.StartNew(() => 
      { 
       var tbl = new DataTable(); 
       for (int i = 1; i < 5; i++) 
       { 
        tbl.Columns.Add("Coloumn" + i, typeof(int)); 
       } 

       for (int j = 0; j <= 30; j++) 
       { 
        var nuRow = tbl.NewRow(); 
        for (int k = 0; k < 4; k++) 
        { 

         nuRow[k] = j; 
        } 
        Thread.Sleep(50); 
        tbl.Rows.Add(nuRow); 
       } 

       return tbl; 
      }); 

      ExportGrid.ItemsSource = task.DefaultView; 
     } 
    }