WPF DataGrid如何为含字符串数组的对象生成对应多行数据？

要实现每个Customer的Names集合中每个元素对应一行、其余属性保持一致的效果，核心是将嵌套的Customer数据结构扁平化，让DataGrid绑定扁平的数据集。以下是具体实现步骤：

方案一：视图模型层扁平化数据（推荐） #

1. 创建扁平数据实体 #

定义一个包含单个Name及Customer其他属性的扁平类：

public class CustomerFlatItem : ObservableObject
{
    public string Name { get; set; }
    public int ID { get; set; }
    public string Code { get; set; }
    public string Contract { get; set; }
    public bool WantsDataFile { get; set; }
}

2. 在ViewModel中转换数据 #

将原ObservableCollection<Customer>转换为扁平的ObservableCollection<CustomerFlatItem>：

private ObservableCollection<CustomerFlatItem> _flattenedCustomers;
public ObservableCollection<CustomerFlatItem> FlattenedCustomers
{
    get => _flattenedCustomers;
    set => SetProperty(ref _flattenedCustomers, value);
}

// 执行数据转换的方法
private void GenerateFlattenedCustomerList(ObservableCollection<Customer> originalCustomers)
{
    var flattenedList = new ObservableCollection<CustomerFlatItem>();
    foreach (var customer in originalCustomers)
    {
        // 处理Names为空的情况（可选，根据业务需求调整）
        if (customer.names == null || customer.names.Count == 0)
        {
            flattenedList.Add(new CustomerFlatItem
            {
                Name = string.Empty,
                ID = customer.ID,
                Code = customer.Code,
                Contract = customer.Contract,
                WantsDataFile = customer.WantsDataFile
            });
            continue;
        }

        // 为每个Name生成一条记录
        foreach (var name in customer.names)
        {
            flattenedList.Add(new CustomerFlatItem
            {
                Name = name,
                ID = customer.ID,
                Code = customer.Code,
                Contract = customer.Contract,
                WantsDataFile = customer.WantsDataFile
            });
        }
    }
    FlattenedCustomers = flattenedList;
}

3. 修改XAML绑定 #

将DataGrid的ItemsSource绑定到扁平集合，并调整Names列的绑定路径：

<DataGrid ItemsSource="{Binding FlattenedCustomers}" AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Names" Binding="{Binding Name}" Width="Auto" />
        <DataGridTextColumn Header="ID" Binding="{Binding ID}" Width="Auto" />
        <DataGridTextColumn Header="Code" Binding="{Binding Code}" Width="Auto" />
        <DataGridTextColumn Header="Contract" Binding="{Binding Contract}" Width="Auto" />
        <DataGridCheckBoxColumn Header="Wants Data File" Binding="{Binding WantsDataFile}" Width="Auto" />
    </DataGrid.Columns>
</DataGrid>

补充：监听数据变化（可选） #

如果原Customer集合或其中的Names集合需要动态更新，需订阅CollectionChanged事件，在数据变更时重新生成扁平集合：

// 假设原Customer集合为OriginalCustomers
OriginalCustomers.CollectionChanged += (s, e) =>
{
    if (e.NewItems != null)
    {
        foreach (Customer newCustomer in e.NewItems)
        {
            newCustomer.names.CollectionChanged += (s2, e2) => GenerateFlattenedCustomerList(OriginalCustomers);
        }
    }
    GenerateFlattenedCustomerList(OriginalCustomers);
};

方案二：行细节模板（适合需保留原结构的场景） #

若不需要完全扁平化，可通过行细节展开显示所有Names，但此方案不会将Name与主属性并列显示：

<DataGrid ItemsSource="{Binding Customers}" AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridTextColumn Header="ID" Binding="{Binding ID}" Width="Auto" />
        <DataGridTextColumn Header="Code" Binding="{Binding Code}" Width="Auto" />
        <DataGridTextColumn Header="Contract" Binding="{Binding Contract}" Width="Auto" />
        <DataGridCheckBoxColumn Header="Wants Data File" Binding="{Binding WantsDataFile}" Width="Auto" />
    </DataGrid.Columns>
    <DataGrid.RowDetailsTemplate>
        <DataTemplate>
            <DataGrid ItemsSource="{Binding names}" AutoGenerateColumns="False">
                <DataGrid.Columns>
                    <DataGridTextColumn Header="Names" Binding="{Binding}" Width="Auto" />
                </DataGrid.Columns>
            </DataGrid>
        </DataTemplate>
    </DataGrid.RowDetailsTemplate>
</DataGrid>

内容的提问来源于stack exchange，提问作者Todd Owen