Question

在我的WPF MVVM项目中，我有一个DataGrid，其中包含一个ObservableCollection（CaseCardEquipmentList）和一个ComboBox列。 ComboBox列中的每个ComboBox都需要填充相对于其各自行中的值的ObservableCollection（SerialNumList）。这可能吗？例如，如果DataGrid中有以下值：

Equip Type | OEM Name | Equip Name | Equip Model | Serial Num |
-----------|----------|------------|-------------|------------|
    Nav    |  Global  |  System 2  |    v.2.1    |  COMBOBOX  |
   Shoes   | Footwear |   Adidas   |     Old     |  COMBOBOX  |
   Shirt   |   UA     |  Clothing  |    Smelly   |  COMBOBOX  |

... ComboBoxes需要显示与底层识别属性相关的所有Serial Nums（SerialNumList）＆＃34; OPEquipIDNum＆＃34;在ObservableCollection CaseCardEquipmentList的每一行中。我该怎么做？

XAML

        <Grid Grid.Row="2">
        <DataGrid HorizontalAlignment="Center"
                  Width="Auto"
                  ItemsSource="{Binding CaseCardEquipmentList}"
                  AutoGenerateColumns="False"
                  CanUserAddRows="False"
                  >
            <DataGrid.Columns>
                <DataGridTextColumn Header="Equipment Type" Width="Auto" Binding="{Binding EquipTypeName}"/>
                <DataGridTextColumn Header="OEM Name" Width="Auto" Binding="{Binding OEMName}"/>
                <DataGridTextColumn Header="Equipment Name" Width="Auto" Binding="{Binding EquipName}"/>
                <DataGridTextColumn Header="Equipment Model" Width="Auto" Binding="{Binding EquipModel}"/>
                <DataGridTemplateColumn Header="SerialNum">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox ItemsSource="{Binding SerialNumList}"
                                      DisplayMemberPath="SerialNum"
                                      SelectedValuePath="FacilityEquipIDNum"
                                      SelectedValue="{Binding SelectedFacEquipIDNum, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                                      />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>

视图模型

private ObservableCollection<ALLCaseCardEquipPrep> _caseCardEquipmentList;
public ObservableCollection<ALLCaseCardEquipPrep> CaseCardEquipmentList
{
    get { return _caseCardEquipmentList; }
    set
    {
        SetProperty(ref _caseCardEquipmentList, value, () => CaseCardEquipmentList);

        if (_caseCardEquipmentList != null)
        {
            GetSerialNumList(CaseCardEquipmentList);
        }
    }
}

public ObservableCollection<FacilityEquipment> SerialNumList
{
    get { return _serialNumList; }
    set { SetProperty(ref _serialNumList, value, () => SerialNumList); }
}

public Int32 SelectedFacEquipIDNum
{
    get { return _selectedFacEquipIDNum; }
    set { SetProperty(ref _selectedFacEquipIDNum, value, () => SelectedFacEquipIDNum); }
}

public void GetSerialNumList(ObservableCollection<ALLCaseCardEquipPrep> ccel)
{
    foreach (ALLCaseCardEquipPrep item in ccel.ToList())
    {
        facilityequipment = new FacilityEquipment();
        facilityequipment.fillFacEquipSerialNumList(item.OPEquipIDNum);
        SerialNumList = facilityequipment.FacilityEquipmentList;
    }
}

MODEL

public FacilityEquipment(int count, int facilityequipmentidnum, string serialnum)
{
    Count = count;
    FacilityEquipmentIDNum = facilityequipmentidnum;
    SerialNum = serialnum;
    FacilityEquipmentList = new ObservableCollection<FacilityEquipment>();
}

public void fillFacEquipSerialNumList(int opequipidnum)
{
    using (MySqlConnection con = new MySqlConnection(dbConnectionString))
    {
        FacilityEquipmentList = new ObservableCollection<FacilityEquipment>();
        con.Open();
        string Query = "SELECT Fac_Equip_ID_Num, Serial_Num FROM facility_equipment WHERE OP_Equip_ID_Num ='" + opequipidnum + "' ";
        MySqlCommand createCommand = new MySqlCommand(Query, con);
        MySqlDataReader dr = createCommand.ExecuteReader();
        int count = 1;
        while (dr.Read())
        {
            int FacilityEquipmentIDNum = dr.GetInt32(0);
            string SerialNum = dr.GetString(1);
            FacilityEquipment facequip = new FacilityEquipment(count, FacilityEquipmentIDNum, SerialNum);
            FacilityEquipmentList.Add(facequip);
            count++;
        }
        con.Close();
    }
}

Answer 1

试试这个：

1.在ViewModel中选择一个名为“AllSerialNumbers”的ObservalbleCollection / List（我在下面的例子中使用过）。

2.获取该产品所选序列号的ID /唯一。（例如 - SelectedSerialNoId）

3.查看以下绑定示例。这段代码将找到当前窗口的DataContext，它将从ObeservableCollection中找到所有的serailnumbers（步骤1）

<DataGridComboBoxColumn Header="SerialNumber" 
                                SelectedValueBinding="{Binding SelectedSerialNoId}"
                                SelectedValuePath="SerialNoId"
                                DisplayMemberPath="SerialNumber"
                                >
            <DataGridComboBoxColumn.ElementStyle>
                <Style TargetType="ComboBox">
                    <Setter Property="ItemsSource" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.AllSerialNumbers}"/>
                </Style>
            </DataGridComboBoxColumn.ElementStyle>
</DataGridComboBoxColumn>

WPF MVVM DataGridComboBox列唯一ObservableCollections

1 个答案: