C# ComboBox String value to object variable to class?

Question

I'm attempting to take a string value from a Combo box then pass it through an object variable to a class and store it there in a string variable.

 private void cboTimeZone_SelectedValueChanged(object sender, EventArgs e)
 {
     extTime1.timeZone = cboTimeZone.SelectedItem;
 }

I'm not totally use to the combo box options to use so.

"Passing a string value from a ComboBox through an object variable to a class into a string variable" -- What exactly do you mean by thet? Does it mean that you want to store the current text value of a ComboBox in another object's string field/property? Then it's a simple assignment. — stakx - no longer contributing
– stakx - no longer contributing, Commented Jan 29, 2011 at 17:58
>> My poor explanation in that content is poor. I want to store the current text value of the ComboBox selectedValue in a string variable in a class. extTime1 is an object variable of that class. — David Brewer
– David Brewer, Commented Jan 29, 2011 at 18:01
@allthosemiles: The following explanation about terminology is somewhat off-topic here, but still valuable to know: In C#, you usually don't call an class' fields and properties "variables"; same as you wouldn't call methods "functions" or "procedures". (So, if you say "string variable in a class", some people like me would probably reach the conclusion that you meant a static field of type string in some unnamed class, which is not what you apparently mean.) — stakx - no longer contributing
– stakx - no longer contributing, Commented Jan 29, 2011 at 18:16
Okay. thank you. ^_^ Still getting use to this. And all of the terminology. — David Brewer
– David Brewer, Commented Jan 29, 2011 at 18:23

Sören · Accepted Answer · 2011-01-30 13:55:50Z

1

Does the cboTimeZone contain string objects? In this case, a simple cast should be enough if extTime1.timeZone is a string:

extTime1.timeZone = (string)cboTimeZone.SelectedItem

if cboTimeZone was filled with objects of type myObject, u can use the ToString() method on the item if you overwrote it in your myObject class:

extTime1.timeZone = cboTimeZone.SelectedItem.ToString()

If you selected a specific property MyProperty of myObject to be shown in the combo box, you can first cast to the object and then access the property by using

extTime1.timeZone = ((myObject)cboTimeZone.SelectedItem).MyProperty

to get that property as a result.

Hope that helps.

edited Jan 30, 2011 at 13:55

answered Jan 29, 2011 at 17:58

Sören

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3 Comments

David Brewer Over a year ago

Thanks. I've never seen a placement of (string) like that. That was what i needed.

Tergiver Over a year ago

Since everything derives from Object and ToString is a member of Object, there is no need for the additional cast in the second example.

Sören Over a year ago

+1 yeah, you are right, thanks for the hint. It only may be interesting to cast to the object if you want to link to a certain property. I will change that above.

stakx - no longer contributing · Accepted Answer · 2011-01-29 18:11:31Z

It's not clear from your question whether your ComboBox is data-bound or not; either way, I think it would be a good idea to first figure out if SelectedItem is indeed the correct property to use, or if there's another, more appropriate one.

If you've set a DataSource for your ComboBox, you've probably also set a DisplayMember. In that case, the DisplayMember will determine which property of the currently selected item of the data source will be shown in the ComboBox as text.

If you've set a ValueMember, you can also use the SelectedValue property to retrieve that property of the currently selected data source item.

SelectedItem simply retrieves the currently selected data source item. This may be a complex object, or a string object, or something else; check with your data source.

The ComboBox's Text property simply contains the text that's currently displayed in the ComboBox's text input field and has type string.

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