Question

我有一个WPF程序，允许用户编辑SQL数据表，以获取给定零件号的零件详细信息。用户输入部件号，我使用表适配器使用行过滤器将其部件号详细信息显示到数据网格。我希望能够获取ObservableCollection列表并将其绑定到我的数据网格中的某个列（即，具有部件类型列的部件类型的选择列表下拉列表）。这是我的.cs：

public MainWindow()
        {
            createDropDowns();
            context = new RefreshAppContext();            
            InitializeComponent();
            PartTypeComboBox.ItemsSource = partTypesList;
#if DEBUG
#endif
        }

        public void findButton_Click(object sender, RoutedEventArgs e)
        {
            var partNumber = inputBox.Text;
            // Searches for part number in db.
            var foundPart = context.RefreshPartTypes.Where(x => x.PartNumber == partNumber).ToList();
            if (!foundPart.Any() == true)
            {
                MessageBox.Show("Part not found. Please try another number.");
            }
            else
            {
                // Adapter used to fill DT with info from DB based on query(ies).
                adapter_PT.Fill(table_PT);
                DataView dv = table_PT.DefaultView;
                dv.RowFilter = "PartNumber='" + partNumber + "'";

                // Fills data grid in UI.
                dg.DataContext = dv;
                PartTypeComboBox.ItemsSource = table_LV.DefaultView;
            }
        }
public void createDropDowns()
        {
            // Populate part styles from lookup table.
            partTypesList = new ObservableCollection<string>();
            adapter_LV.Fill(table_LV);
            List<string> temp = table_LV.AsEnumerable().Select(x => x[2].ToString()).ToList();
            foreach (var partType in temp)
            {
                partTypesList.Add(partType);
            }
            partTypesList.Add(""); // Add a blank option in case user needs to input blank cell.
        }

这是我的.xaml：

<DataGrid x:Name="dg" ItemsSource="{Binding}" AutoGenerateColumns="True" AutoGeneratingColumn="m_grid_AutoGeneratingColumn" HorizontalAlignment="Left" Margin="28,-145,-779,0" VerticalAlignment="Top" Height="165" Width="1222" AlternatingRowBackground="LightGray" AlternationCount="2">
            <DataGrid.Columns>
                <DataGridComboBoxColumn x:Name="PartTypeComboBox" 
                                        Header="PartTypeTest" 
                                        DisplayMemberPath="Key" 
                                        SelectedValuePath="Id" 
                                        SelectedValueBinding="{Binding PartType}"/>
            </DataGrid.Columns>
        </DataGrid>

我可以使用正确的信息列表创建一个新的ComboBox列，但是我无法将该组合框显示（或绑定？）到我的table_PT数据表中填充的PartType列上。方向？谢谢！

Answer 1

您需要为每个项目添加指定显示字符串属性路径的DisplayMemberPath。

 <DataGridComboBoxColumn x:Name="PartStylesComboBox"  DisplayMemberPath="PartType "  Header="Test" SelectedValuePath="{Binding partStylesList}" />

Answer 2

解决：

<DataGrid x:Name="dg" ItemsSource="{Binding}" AutoGenerateColumns="True" AutoGeneratingColumn="event_AutoGeneratingColumn" HorizontalAlignment="Left" Margin="28,-145,-134,0" VerticalAlignment="Top" Height="165" Width="582" AlternatingRowBackground="LightGray" AlternationCount="2">
            <DataGrid.Columns>
                <DataGridTemplateColumn x:Name="comboCol" Header="PartTypeTest" Width="150">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox ItemsSource="{Binding partTypesList, RelativeSource={RelativeSource AncestorType=Window}}" 
                                      SelectedItem="{Binding PartType, UpdateSourceTrigger=PropertyChanged}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>

将ComboBox添加到从SQL DataTable中提取的WPF DataGrid

2 个答案: