C # Windows Forms Generic Object

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C # Windows Forms Generic Object

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#1 by (2 votes)
#2 by (0 votes)

3

I have a Desktop application in C # and need to load a dropdown with an "All" option and the rest coming from a database table. To load the dropdownlist I did something like this:

        cmbOpcoes.Items.Add(new { Id = 0, Name = "Todos" });
        foreach (opcao o in db.opcao.OrderBy(c => c.nome).ToList())
        {
            cmbOpcoes.Items.Add(new { Id = opcao.id, Name = opcao.nome.ToString() });
        }
        cmbOpcoes.ValueMember = "Id";
        cmbOpcoes.DisplayMember = "Name";
        cmbOpcoes.SelectedIndex = 0;

And that works out well! It loads the options and comes default with the "All" option selected. The problem occurs when I have get the option populated by the user. The traditional:

cmbOpcoes.SelectedValue

comes with null value. The option:

cmbOpcoes.SelectedIndex

does not come null, but it does not contain the ID but rather the index of the value in the dropdown. The closest I needed was the

cmbOpcoes.SelectedItem

With the mouse over it, I see that it has an object {Id="3", Name="Option X"}, however I can not access these properties.

What code do I need to access this ID, since what do I need?

Thank you!

c# linq winforms dropdown

asked by anonymous 12.05.2016 / 00:13

2 answers

0

According to the MSDN , you can get the index with SelectedIndex same and the option text with (SelectedItem as Object).ToString() .

private void showSelectedButton_Click(object sender, System.EventArgs e) {
    int selectedIndex = comboBox1.SelectedIndex;
    Object selectedItem = comboBox1.SelectedItem;

    MessageBox.Show("Selected Item Text: " + selectedItem.ToString() + "\n" +
                    "Index: " + selectedIndex.ToString());
}

12.05.2016 / 01:01

view HTML element placed on page using DOM - Javascript Get selection event + selection movement - Jquery

score 2 · Accepted Answer

To access the content of cmbOpcoes.SelectedItem you have to convert it to an object (Class) that contains the properties, since your items are anonymous, you can use dynamic to access properties. >

See an example:

dynamic obj=cmbOpcoes.SelectedItem;
int id=obj.Id
string name=obj.Name;