how to define source for wpf datagrid xaml DataGridComboBoxColumn

Question

Hai
I am trying to set source for datagrid custom control DataGridComboBoxColumn.
I used code like this

In viewmodel

     public ObservableCollection NameList { get; set; }

 public ViewModel()
        {
            NameList =new ObservableCollection(db.MarKLists.ToList());
        }

in mainwindow

            private void Button_Click(object sender, RoutedEventArgs e)
            {
                ViewModel VM = new ViewModel();
                SubPage Sp = new SubPage();
                Sp.DataContext = VM;
                MainFrame.Content = Sp;
            }

and in page

I want to pollute name field from NameList to combo, I tried different methods but none worked. please help what I am doing wrong.
Also I don't want template column.

Thanks

Accepted Answer

Welcome to our Microsoft Q&A platform!

I use the below method to bind the data in the Page.xaml, the DataGridComboBoxColumn can show the namelist.

Add the CollectionViewSource for the page
```
            
    
```

2.replace the your ItemsSource="{Binding NameList}" as ItemsSource="{Binding Source={StaticResource ItemsCVS}}" in DataGridComboBoxColumn

Thanks.

Answer

Hi, the documentation on MSDN about the ItemsSource of the DataGridComboBoxColumn says that only static resources, static code or inline collections of combobox items can be bound to the ItemsSource. In your case you can use StaticResource in your XAML:

You can test with following code:

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using WpfApp37;

namespace WpfApp1
{
  public partial class Window37 : Window
  {
    public Window37()
    {
      InitializeComponent();
    }
    private void Button_Click(object sender, RoutedEventArgs e)
    {
      ViewModel VM = new ViewModel();
      SubPage Sp = new SubPage();
      Sp.DataContext = VM;
      MainFrame.Content = Sp;
    }
  }
}

namespace WpfApp37
{
  public class ViewModel
  {
    public ViewModel()
    {
      NameList = new ObservableCollection(db.MarKLists.ToList());
      Vm_StudentCollection = new ObservableCollection(db.StudentList.ToList());
    }  
    Model db = new Model();
    public ObservableCollection NameList { get; set; }
    public ObservableCollection Vm_StudentCollection { get; set; }
    public object Vm_StudentCollection_Curitem { get; set; }
  }

  public class Student
  {
    public string M_Name { get; set; }
    public int M_GenderID { get; set; }
    public string M_Mark1 { get; set; }
    public int M_Total { get; set; }
  }

  public class MarKList
  {
    public string Name { get; set; }
    public int ID { get; set; }
  }

  internal class Model
  {
    Random rnd = new Random();
    internal IEnumerable MarKLists
    {
      get
      {
        var l = new List();
        l.Add(new MarKList() { ID = 1, Name = "Male" });
        l.Add(new MarKList() { ID = 2, Name = "Female" });
        l.Add(new MarKList() { ID = 3, Name = "TransGender" });
        return l;
      }
    }
    internal IEnumerable StudentList { get { for (int i = 0; i < 10; i++) yield return new Student() { M_Name = $"Name {i}", M_GenderID = rnd.Next(1, 4), M_Mark1 = $"Mark1 {i}", M_Total = i }; } }
  }
}

XAML of MainWindow:

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