PowerShell WPF - 将 DataGrid ComboBox 绑定到 ItemsSource 中的列

Question

我正在尝试使用给定列中的唯一值填充 DataGrid 中的 ComboBox，但是我得到了意想不到的结果，因为它将该行中的值拆分为单个字符并用所述字符填充每个 ComboBox。

这是我的问题的一个简单示例脚本；

$csv = "ID,Fruit,Owner`r`n"
$csv += "1,Apple,Andrew`r`n"
$csv += "2,Banana,Bill`r`n"
$csv += "3,Cherry,Charles`r`n"
$csv += "4,Date,Daniel`r`n"
$csv += "5,Elderberry,Ethan`r`n"

$data = ConvertFrom-Csv $csv

$inputXML = @"
<Window x:Name="DataGridComboTest" x:Class="DataGridComboTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="DataGridComboTest" Width="640" Height="480" WindowStartupLocation="CenterScreen">
    <Grid>
        <DataGrid x:Name="DataGrid" Margin="10,10,10,10" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding ID}" Header="ID"/>
                <DataGridTextColumn Binding="{Binding Fruit}" Header="Fruit"/>
                <DataGridTextColumn Binding="{Binding Owner}" Header="Owner"/>

                <DataGridTemplateColumn Header="Owner Combo">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox
                                SelectedItem="{Binding Path=Owner, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                                ItemsSource="{Binding Owner}"
                                Text="{Binding Path=Owner, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
                            </ComboBox>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>
"@

$inputXML = $inputXML -replace 'mc:Ignorable="d"','' -replace "x:N",'N'  -replace '^<Win.*', '<Window'
[void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')
[xml]$XAML = $inputXML

$reader=(New-Object System.Xml.XmlNodeReader $xaml)
$Form=[Windows.Markup.XamlReader]::Load( $reader )
$xaml.SelectNodes("//*[@Name]") | %{ Set-Variable -Name "$($_.Name)" -Value $Form.FindName($_.Name) -ErrorAction Stop }

$DataGrid.ItemsSource = $data

$Form.ShowDialog() | Out-Null

我想做的是从表中的现有所有者中为每个水果选择一个不同的所有者，但是我可以选择相邻所有者名称中的每个字母；

Answer 1

您应该将ItemsSource 绑定到IEnumerable<string>，而不是标量string（即IEnumerable<char>）。

试试这样的：

...
ItemsSource="{DynamicResource owners}"
...

$owners = $data | Select-Object -ExpandProperty Owner -Unique
$Form.Resources.Add("owners", $owners)

Answer 2

在mm8 的帮助下，我能够想出一个工作脚本；

$csv = "ID,Fruit,Owner`r`n"
$csv += "1,Apple,Andrew`r`n"
$csv += "2,Banana,Bill`r`n"
$csv += "3,Cherry,Charles`r`n"
$csv += "4,Date,Daniel`r`n"
$csv += "5,Elderberry,Ethan`r`n"
$csv += "6,Fig,Bill`r`n"
$csv += "7,Grape,Daniel`r`n"

$data = ConvertFrom-Csv $csv

$inputXML = @"
<Window x:Name="DataGridComboTest" x:Class="DataGridComboTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="DataGridComboTest" Width="640" Height="480" WindowStartupLocation="CenterScreen">
    <Grid>
        <DataGrid x:Name="DataGrid" Margin="10,10,10,10" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding ID}" Header="ID"/>
                <DataGridTextColumn Binding="{Binding Fruit}" Header="Fruit"/>
                <DataGridTextColumn Binding="{Binding Owner}" Header="Owner"/>

                <DataGridTemplateColumn Header="Owner Combo">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox
                                SelectedItem="{Binding Path=Owner, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                                ItemsSource="{DynamicResource owners}"
                                Text="{Binding Path=Owner, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
                            </ComboBox>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>
"@

$inputXML = $inputXML -replace 'mc:Ignorable="d"','' -replace "x:N",'N'  -replace '^<Win.*', '<Window'
[void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')
[xml]$XAML = $inputXML

$reader=(New-Object System.Xml.XmlNodeReader $xaml)
$Form=[Windows.Markup.XamlReader]::Load( $reader )
$xaml.SelectNodes("//*[@Name]") | %{ Set-Variable -Name "$($_.Name)" -Value $Form.FindName($_.Name) -ErrorAction Stop }

$DataGrid.ItemsSource = $data

#$owners = [Linq.Enumerable]::ToArray($data | Select-Object -ExpandProperty Owner)
$owners = $data | Select-Object -ExpandProperty Owner -Unique
$Form.Resources.Add("owners", $owners)

$Form.ShowDialog() | Out-Null

DynamicResource 绑定是关键，但 mm8 答案中的 [Linq.Enumerable] 行引发了错误。然而，简化它以从 $data 中选择唯一所有者解决了这个问题。我还在源数据中添加了几个重复的所有者，以更准确地模拟真实场景，因此是“-Unique”。