I have a class that contains a property that is an enum:
public RaTypes RaBucket1Type { get; set; }
My enum is:
public enum RaTypes
{
Red,
Yellow
}
I was able to bind a form's combobox data-source to the enum so that when I click on the drop-down, I see the enumerations:
cmbBucket1Type.DataSource = Enum.GetValues(typeof(RaTypes));
When I load the form, I would like to populate the combo-box with the existing value. I have tried the following:
cmbBucket1Type.DisplayMember = "TradeType";
cmbBucket1Type.ValueMember = "TradeEnumID";
cmbBucket1Type.SelectedValue = EditedAlgorithm.RaBucket1Type;
But this did not work.
Also, I'm not sure I have implemented the ValueChanged event handler correctly either:
EditedAlgorithm.RaBucket1Type = (RaTypes)((ComboBox)sender).SelectedItem;
Can someone help me understand:
Thanks -Ed
UPDATES I have tried
cmbBucket1Type.SelectedIndex = cmbBucket1Type.FindString(EditedAlgorithm.RaBucket1Type.ToString());
and
cmbBucket1Type.SelectedItem = EditedAlgorithm.RaBucket1Type;
Neither works.
You can set the selectedValue like this:
cmbBucket1Type.SelectedValue = EditedAlgorithm.RaBucket1Type;
And you can handle the selected value when the combo change like this:
private void cmbBucket1Type_SelectedValueChanged(object sender, EventArgs e)
{
var selectedValue = cmbBucket1Type.SelectedValue;
}
I think you're using the terminology a little differently than normal, which makes it difficult to understand.
Normally, the terms Add , Populate , and Select are used to mean the following:
Having cleared that up, I assume following is what you want to do.
ComboBox
with a set of values. In your case, values of RaType
Enum
. SomeClass
. RaBucket1Type
property of the said class instance with an enum
value of your choice. I'll initialize it to Yellow
. ComboBox
select the said value at start up. Form_Load
, at any given time, if the user changes the value of the ComboBox
, have the change reflected in your class instance property. For that, I would do something like this:
public partial class MainForm : Form
{
// Your class instance.
private SomeClass InstanceOfSomeClass = null;
public MainForm()
{
InitializeComponent();
// Initialize the RaBucket1Type property with Yellow.
InstanceOfSomeClass = new SomeClass(RaTypes.Yellow);
// Populating the ComboBox
comboBox1.DataSource = Enum.GetValues(typeof(RaTypes));
}
// At selected index changed event
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
// Get the selected value.
var selected = comboBox1.SelectedValue;
// Change the `RaBucket1Type` value of the class instance according to the user choice.
InstanceOfSomeClass.RaBucket1Type = (RaTypes)selected;
}
private void MainForm_Load(object sender, EventArgs e)
{
// At form load time, set the `SelectedItem` of the `ComboBox` to the value of `RaBucket1Type` of your class instance.
// Since we initialized it to `Yellow`, the `ComboBox` will show `Yellow` as the selected item at load time.
if (InstanceOfSomeClass != null)
{
comboBox1.SelectedItem = InstanceOfSomeClass.RaBucket1Type;
}
}
}
public enum RaTypes
{
Red,
Yellow
}
public class SomeClass
{
public RaTypes RaBucket1Type { get; set; }
public SomeClass(RaTypes raTypes) { RaBucket1Type = raTypes; }
}
Please do keep in mind this is a basic example to show you how to handle the situation and not a complete finished code. You'll need to do a bunch of error checks to make sure class instances and selected items are not null etc.
I FOUND MY ANSWER:
I had the SelectedIndexChanged event pointing to my event handler which means that when I "added" items to the ComboBox using:
comboBox1.DataSource = Enum.GetValues(typeof(RaTypes));
it was triggering the event handler, and resetting my class property. My event handler was this:
var selectedValue = cmbBucket1Type.SelectedValue;
So the simple solution was to:
Add the following event handler in code AFTER I assign the DataSource
bucketType1.SelectedIndexChanged += BucketTypeChanged;
This worked.
THANK YOU ALL FOR HELPING!!
-Ed
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