VB.net XAML datagrid 单元格颜色根据值变化

Question

我的 XAML 代码：

<Window x:Class="MainWindow"
        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"
        xmlns:local="clr-namespace:Datagrid_Binding"
        mc:Ignorable="d"
        Title="MainWindow" Height="8517" Width="1244">
    <Grid>
        <DataGrid x:Name="WaterfallDataGrid" CanUserSortColumns="False" ColumnWidth="60" AutoGenerateColumns="False">



            <DataGrid.Columns>
                <DataGridTextColumn Header="Load" Binding="{Binding Load}"></DataGridTextColumn>
                <DataGridTextColumn Header="PF" Binding="{Binding PF}"></DataGridTextColumn>
                <DataGridTextColumn Header="Spare" Binding="{Binding Spare}"></DataGridTextColumn>
            </DataGrid.Columns>

            <DataGridTextColumn Binding="{Binding Load}">
                <DataGridTextColumn.ElementStyle>
                    <Style TargetType="{x:Type TextBlock}">
                        <Style.Triggers>
                            <Trigger Property="Text" Value="Full Load">
                                <Setter Property="Background" Value="LightGreen"/>
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </DataGridTextColumn.ElementStyle>
            </DataGridTextColumn>


        </DataGrid>
    </Grid>
</Window>

我的 VB.net 代码。

Class MainWindow
    Public Sub New()

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

        ' Add any initialization after the InitializeComponent() call.
        Dim dt3 As New DataTable("Waterfall")

        dt3.Columns.Add("Load")
        dt3.Columns.Add("PF")
        dt3.Columns.Add("Spare")
        'dt3.rows.add(New Object() {"full load", "0.8", "20%"})
        dt3.Rows.Add("full load", "0.8", "20%")
        WaterfallDataGrid.ItemsSource = dt3.DefaultView

    End Sub
End Class

我想要做的是当单元格具有“满载”文本时，它会改变其单元格颜色。我在运行时收到一条错误消息，提示“在使用 ItemsSource 之前，Items 集合必须为空。”对此非常不解。一些帮助表示赞赏。

Answer 1

问题是你定义了同一列两次。

<Window x:Class="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">
        <Grid>
            <DataGrid x:Name="WaterfallDataGrid" CanUserSortColumns="False" ColumnWidth="60" AutoGenerateColumns="False">
                <DataGrid.Columns>
                    <DataGridTextColumn Header="Load" Binding="{Binding Load}">
                        <DataGridTextColumn.ElementStyle>
                            <Style TargetType="{x:Type TextBlock}">
                                    <Style.Triggers>
                                    <Trigger Property="Text" Value="full load">
                                        <Setter Property="Background" Value="LightGreen"/>
                                    </Trigger>
                                </Style.Triggers>
                            </Style>
                        </DataGridTextColumn.ElementStyle>
                    </DataGridTextColumn>
                    <DataGridTextColumn Header="PF" Binding="{Binding PF}"></DataGridTextColumn>
                    <DataGridTextColumn Header="Spare" Binding="{Binding Spare}"></DataGridTextColumn>
                </DataGrid.Columns>
            </DataGrid>
        </Grid>
    </Window>