ComboBox SelectedValue is null

Question

I'm trying to get the .SelectedValue of a ComboBox, but it keeps returning null instead of the actual value in .ValueMember. I tried a couple of different approaches, and came up with this:

DataTable datatable = DataAccess.GetDataTable(DateTime.Now); // Get DataTable from DB call
if (datatable.Rows.Count > 0)
{
    List<object> items = new List<object>();
    foreach (DataRow row in datatable.Rows)
    {
        items.Add(new { Text = Convert.ToString(row["PersFullName"]), Value = Convert.ToString(row["PersNbr"]) });
    }

    this.cmbDDLFilter.DisplayMember = "Text";
    this.cmbDDLFilter.ValueMember = "Value";
    this.cmbDDLFilter.DataSource = items;
}

This will work when setting the visual part of the ComboBox, but when I do this:

long nbr = Convert.ToInt64(this.cmbDDLFilter.SelectedValue);

The .SelectedValue will be null even though I set the .ValueMember to "Value".

I notice though that the .SelectedText is also null, but the .SelectedItem does indeed have the object I added to the list.

How do I get the anonymous object's .Value to actually work with .SelectedValue?

I've used this SO question as a reference, but it doesn't work for me.

If you have a nice neat DataTable just use that as the DataSource. No need to create new anon types and place in a new list of object (which will not have a `Value` property) — Ňɏssa Pøngjǣrdenlarp, Sep 18 '18 at 23:06
Pls check this also https://stackoverflow.com/questions/3867784/winforms-combobox-selectedvalue-is-null — MBB, Sep 19 '18 at 07:20

score 0 · Answer 1 · answered Sep 18 '18 at 23:04

0

Try this:

cmbDDLFilter.SelectedIndex = cmbDDLFilter.FindStringExact("Value")

answered Sep 18 '18 at 23:04

Michael

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ComboBox SelectedValue is null

1 Answers1