将数据导入DatagridComboBoxColumn不会更新组合列表值

Question

I build a DataGrid the contains a custom ComboBoxColumn that shows and selects the proper fields when I select it with a mouse, but resets to the first item in the list after the ComboBox loses focus. Additionally, when when I import data from an Excel spreadsheet, the ComboBox does not change to match the value in the worksheet.

Note: I'm planning on reusing this class to create a series of ComboBoxes for different data.

What is preventing the Combo Box from accepting a new value?

ComboList class

namespace x.Models
{
  public class ComboList
  {
    public int FieldID {get;set;}
    public string FieldString {get;set;}
  }
}

XAML Combo Box code

<DataGridComboBoxColumn Header="Platform Type" x:Name="PlatformTable" SelectedValueBinding="{Binding FieldID}" DisplayMemberPath="FieldString" SelectedValuePath="1" />

Code(behind)

public partial class MainWindow: Window
{
  public ObservableCollection<Models.ComboList> PlatformCombo {get;set;}
  public MainWindow()
  {
    PlatformCombo = new ObservableCollection<Models.ComboList>()
    {
      new Models.ComboList() {FieldID=1,FieldString="Mounted"},
      new Models.ComboList() {FieldID=2,FieldString="Dismounted"}
    };
    PlatformTable.ItemsSource = PlatformCombo;
}

Sample Excel data

Platform Type
1
2

Answer 1

Changing SelectedValueBinding to SelectedItemBinding fixes one part of the problem on the field not accepting a new value. [link] ( DataGridComboBoxColumn not updating model WPF )

I'm still left with the question as to why when importing from Excel, the combo box is never updated; left empty for each row, even though there is appropriate data for the combo box.

Answer 2

XAML组合框SelectedValueBinding必须设置为DataGrid组合框控件名称，而不是通用组合框FieldID ，并且UpdateSourceTrigger需要设置为LostFocus 。

SelectedValueBinding="{Binding Platform_Type, Mode=TwoWay, UpdateSourceTrigger=LostFocus}"