WPF DataGrid DataGridTemplateColumn ComboBox ItemSsource

Question

我正在尝试创建一个非常简单的 CRUD WPF 应用程序。我有一个包含 2 列、ID 和类别的数据网格。对于类别，我希望能够在添加和编辑时从列表中进行选择。到目前为止，这是我在 xaml 中的内容:

<DataGrid Name="dataGridBudgetEntries" AutoGenerateColumns="False" CanUserAddRows="True" CanUserDeleteRows="True" RowEditEnding="dataGridBudgetEntries_RowEditEnding">
    <DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding ID}" Header="ID" IsReadOnly="True"></DataGridTextColumn>
        <DataGridTemplateColumn Header="Category">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding CategoryName}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <ComboBox></ComboBox>
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

在后面的代码中，我有以下内容:

public MainWindow()
{
    InitializeComponent();

    dataGridBudgetEntries.ItemsSource = FinancialManagementDatabase4ME.BLL.GetBudgetEntriesForDataGrid();
    List<Category> categories = FinancialManagementDatabase4ME.BLL.GetCategories();
}

网格正在填充并且类别的显示值是正确的。我无法弄清楚如何在数据模板中定义组合框，以便它显示选定的值以及其他类别的列表。我已经看到了大量的例子，但无法得到任何工作。

Answer 1

 <DataGrid AutoGenerateColumns="False" CanUserAddRows="True" CanUserDeleteRows="True" ItemsSource="{Binding Entries}" RowEditEnding="dataGridBudgetEntries_RowEditEnding">
    <DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding ID}" Header="ID" IsReadOnly="True"></DataGridTextColumn>
        <DataGridTemplateColumn Header="Category">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Category}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <ComboBox ItemsSource="{Binding Categories}"></ComboBox>
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>


public MainWindow()
{
    InitializeComponent();
    this.DataContext = new MyViewModel();
}

public class MyViewModel : ViewModelBase
{
    public MyViewModel()
    {
        this.Entries = FinancialManagementDatabase4ME.BLL.GetBudgetEntriesForDataGrid();
        this.Categories = FinancialManagementDatabase4ME.BLL.GetCategories();
    }

    private ObservableCollection<BudgetEntries> entries;
    public ObservableCollection<BudgetEntries> Entries
    {
        get
        {
            return this.entries;
        }

        set
        {
            if (value != this.entries)
            {
                this.entries = value;
                this.OnPropertyChanged("Entries");
            }
        }
    }

    private ObservableCollection<Category> categories;
    public ObservableCollection<Category> Categories
    {
        get
        {
            return this.categories;
        }

        set
        {
            if (value != this.categories)
            {
                this.categories = value;
                this.OnPropertyChanged("Categories");
            }
        }
    }
}

public class BudgetEntries : ViewModelBase
{
    private string id;
    public string Id
    {
        get
        {
            return this.id;
        }

        set
        {
            if (value != this.id)
            {
                this.id = value;
                this.OnPropertyChanged("Id");
            }
        }
    }

    private string category;
    public string Category
    {
        get
        {
            return this.category;
        }

        set
        {
            if (value != this.category)
            {
                this.category = value;
                this.OnPropertyChanged("Category");
            }
        }
    }
}