PowerShell中WPF数据绑定至对象子属性的问题

你的问题核心是混淆了ItemsSource绑定目标和子属性显示逻辑：ItemsSource需要绑定到整个ObservableCollection集合，而子属性的读取/写入应该通过DataGrid的列绑定来配置，不能直接在ItemsSource的路径里指定子属性。

修正步骤： #

• 第一步：将ItemsSource的绑定路径改回[Grid1]，指向你的ObservableCollection对象
• 第二步：为DataGrid手动定义列，分别绑定到子属性SubObject.ItemName和SubObject.ItemCount，确保双向绑定生效

修正后的完整代码： #

$HashDataContexts = @{}
$FormMain.DataContext = $HashDataContexts

$DGSourceData = @()
$SourceData = @(@("Item One", 1), @("Item Two", 2), @("Item Three", 3))
foreach($SourceItem in $SourceData) {
    $SourceObject = [PSCustomObject]@{
        SubObject = [PSCustomObject]@{
            ItemName = $SourceItem[0]
            ItemCount = $SourceItem[1]
        }
    }
    $DGSourceData += $SourceObject
}
$DataContext = New-Object -TypeName System.Collections.ObjectModel.ObservableCollection[Object] -ArgumentList (,$DGSourceData)
$HashDataContexts.Add("Grid1",$DataContext)

# 修正ItemsSource绑定，指向整个集合
$DGBinding = New-Object System.Windows.Data.Binding
$DGBinding.Path = "[Grid1]"
$DGBinding.Mode = [System.Windows.Data.BindingMode]::TwoWay
[System.Windows.Data.BindingOperations]::SetBinding($DG1,[System.Windows.Controls.DataGrid]::ItemsSourceProperty, $DGBinding)

# 手动创建DataGrid列，绑定子属性
$colName = New-Object System.Windows.Controls.DataGridTextColumn
$colName.Header = "Item Name"
$nameBinding = New-Object System.Windows.Data.Binding
$nameBinding.Path = "SubObject.ItemName"
$nameBinding.Mode = [System.Windows.Data.BindingMode]::TwoWay
$colName.Binding = $nameBinding

$colCount = New-Object System.Windows.Controls.DataGridTextColumn
$colCount.Header = "Item Count"
$countBinding = New-Object System.Windows.Data.Binding
$countBinding.Path = "SubObject.ItemCount"
$countBinding.Mode = [System.Windows.Data.BindingMode]::TwoWay
$colCount.Binding = $countBinding

# 将列添加到DataGrid
$DG1.Columns.Add($colName)
$DG1.Columns.Add($colCount)

# Show the window
$FormMain.Dispatcher.InvokeAsync{$FormMain.ShowDialog()}.Wait()

关键说明： #

• WPF的ItemsSource要求绑定的是集合对象，而不是集合中元素的某个属性，你原来的[Grid1.SubObject]写法不符合绑定规则，导致无法正确解析。
• 当集合中的元素是嵌套对象时，需要为DataGrid的每一列单独配置绑定路径，明确指向子属性，这样才能实现双向绑定——修改DataGrid单元格的值时，会同步更新到SubObject的对应属性中。

内容的提问来源于stack exchange，提问作者chrisdotknee