从没有ToString C＃的Combobox（string）检查值

Question

I'm doing a project where "ToString" is being used as a method.

private void button1_Click(object sender, EventArgs e)
{
    if(cboPlaneType.SelectedItem = "Generic")
    {
    }
    else if (cboPlaneType.SelectedIndex = "Passenger")
    {
    }
    else if (cboPlaneType.SelectedIndex = "Fighter Jet")
    {
    }
}

And in this case i'm not sure what to do. As you can see I've tried a few different option but with no avail. I've also tried if((string)cboPlaneType.SelectedItem = "Generic") And that didn't work.

**Edit Just to point out, SelectedValue wasn't the correct answer. ended up being " if((string)combobox.SelectedItem == "Generic")

Answer 1

The equality operator in c# is == ; = is an assignment operator.

SelectedIndex will return an int representing the zero-based position of the item that is selected. (I'm guessing it returns -1 when no item is selected.)

SelectedItem can be an object of any type; if it is not a string then you can't match it by comparing with a string.

Are you saying that the objects with which the ComboBox is populated override ToString() ? You should still be able to use the result of that method for comparison, because it can only return a string . Otherwise, you might be able to use SelectedValue , but this depends on what kind of ComboBox you are using and how you have set it up.

Answer 2

SelectedIndex is an property of type Int32 . Maybe you want to use SelectedValue instead ?