WPF bind data grid combo box column programmatically to itemsource

Question

In my datagrid, one of columns is DataGridComboBoxColumn, where I'm trying to display different drop down menu in every row. Easy task when creating combo box in XAML instead of doing it programatically. My problem is that I have no idea how to bind it properly. This is what I tried:

private DataGridComboBoxColumn CreateComboValueColumn(List<Elements> elements)
{
    DataGridComboBoxColumn column = new DataGridComboBoxColumn();
    column.ItemsSource = elements;
    column.DisplayMemberPath = "Text";
    column.SelectedValuePath = "ID";
    column.SelectedValueBinding = new Binding("Value");
    return column;
}

public class Elements
{
    public string Name { get; set; }
    public string Value { get; set; }
    public string Comment { get; set; }
    public List<ComboItem> ComboItems { get; set; }
}

public class ComboItem
{
    public string ID { get; set; }
    public string Text { get; set; }
}

why do you avoid xaml?

FoggyFinder
– FoggyFinder

2018-03-21 10:36:02 +00:00
Commented Mar 21, 2018 at 10:36 — FoggyFinder
– FoggyFinder, Commented Mar 21, 2018 at 10:36
because I have dynamic amount of DataGrids

Kajbo
– Kajbo

2018-03-21 11:43:59 +00:00
Commented Mar 21, 2018 at 11:43 — Kajbo
– Kajbo, Commented Mar 21, 2018 at 11:43

Juan Carlos Rodriguez · Accepted Answer · 2018-03-21 11:05:42Z

1

You have to think from above and read what you are doing.

    column.ItemsSource = elements;

That sets your column itemssource to a list of elements.

column.DisplayMemberPath = "Text";

It's not a member of Element so it won't show anything. You should set your column.ItemsSource to:

column.ItemsSource = elements[i].ComboItems

Being "i" the element you want to show.

Then if you want to show the text you should:

    column.DisplayMemberPath = "Text";

If you want the Id then just:

    column.DisplayMemberPath = "ID";

I wrote this without any editor and I think this is close to the answer you want, if I'm wrong comment this and I'll try to answer in a more accurate way.

edited Mar 21, 2018 at 11:05

answered Mar 21, 2018 at 10:46

Juan Carlos Rodriguez

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2 Comments

Kajbo Over a year ago

you are right at pointing out that column.ItemsSource = elements[i].ComboItems should make it work. And it would, if I knew how to tell XML that i = column.row

Juan Carlos Rodriguez Over a year ago

You get your items by XML ?

Kajbo · Accepted Answer · 2018-03-21 12:59:00Z

0

It seems that adding binding from style works better than direct approach. This works:

private DataGridComboBoxColumn CreateComboValueColumn(List<Elements> elements)
{
    DataGridComboBoxColumn column = new DataGridComboBoxColumn();

    Style style = new Style(typeof(ComboBox));
    //set itemsource = {Binding ComboItems}
    style.Setters.Add(new Setter(ComboBox.ItemsSourceProperty, new Binding("ComboItems")));
    column.DisplayMemberPath = "Text";
    column.SelectedValuePath = "ID";
    column.SelectedValueBinding = new Binding("Value");

    column.ElementStyle = style;
    column.EditingElementStyle = style;
    return column;
}

edited Mar 21, 2018 at 12:59

answered Mar 21, 2018 at 12:18

Kajbo

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Comments

Razali Husain · Accepted Answer · 2024-04-04 12:02:57Z

0

You can use the following as an example:

    ComboBox dgvCmb = new ComboBox();
    dgvCmb.Name = "Name";
    dgvCmb.Items.Add("Razali");
    dgvCmb.Items.Add("Boeing");
    dgvCmb.Items.Add("Londang");
    dgvCmb.Items.Add("MCKK");
    
    DataGridComboBoxColumn   dgc=new DataGridComboBoxColumn();
    dgc.Header = "Test";
    dgc.ItemsSource = dgvCmb.Items;
    dataGrid.Columns.Add(dgc);

edited Apr 4, 2024 at 12:02

answered Apr 4, 2024 at 12:01

Razali Husain

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