Question

我是WPF的新手，我正在开发一个项目，我正在使用WPF和DataGrid来显示DataTable。

我有列和行标题可见，我遇到的问题是，在调用WPF窗口的方法完成之前，DataGrid左上角的SelectAll按钮不会出现。这会导致列标题未对齐，直到出现SelectAll按钮。

我在一个非常简单的项目中重新创建了这个问题。

我可以在设计模式中看到SelectAll按钮，结果仍然相同。有人可以帮忙吗？下面的图片显示了我在说什么。

我的XAML在其后面是创建DataTable

的C＃

<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

我无法以您描述的方式重现您的问题。

但是根据你的描述，它可能是一个用异步方法填充网格的解决方案。在这种情况下，视图将不会阻塞，直到方法完成并且网格应正确绘制。

我添加了一个代码片段，它将异步填充网格：

{{1}}

一旦DataGrid加载，WPF DataGrid SelectAll按钮就会出现

1 个答案: