C# Calling a Variable from another Variable

Question

public class Car
 {
     public string Color { get; set; }
     public string Model { get; set; }
 }

How I call "Car.Color" or "Car.Model" from a variable?

Ex.

string MyVariable = "Color";
MyListBox.Items.Add(Car.Model); //It Works Ok
MyListBox.Items.Add(Car.MyVariable); // How??

Regards.

Just to clarify anyone else (it took me a min to figure out) I think he is asking about using reflection to search for the property selected in MyVariable and add that to the list box. — Scott Chamberlain
– Scott Chamberlain, Commented Jun 28, 2013 at 18:02
Are you using Winforms or WPF? Binding is the solution to this, but it is different depending on which you are using. — Scott Chamberlain
– Scott Chamberlain, Commented Jun 28, 2013 at 18:02
What are you trying to do? you Could do Color MyColor = Car.Color; maybe if thats your goal. — Bit
– Bit, Commented Jun 28, 2013 at 18:04

Jon Skeet · Accepted Answer · 2013-06-28 20:25:49Z

11

You'd have to use reflection. For example:

var property = typeof(Car).GetProperty(MyVariable);
MyListBox.Items.Add(property.GetValue(Car)); // .NET 4.5

Or:

var property = typeof(Car).GetProperty(MyVariable);
MyListBox.Items.Add(property.GetValue(Car, null)); // Prior to .NET 4.5

(Your sample code would be clearer if you used a different name for the variable Car than the type Car, mind you. Ditto MyVariable which doesn't look like a variable in normal .NET naming conventions.)

edited Jun 28, 2013 at 20:25

answered Jun 28, 2013 at 18:01

Jon Skeet

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7 Comments

Jon Skeet Over a year ago

@karmany: It's worth noting that this is the sort of thing you don't want to be doing most of the time. We don't really have enough context to know whether it's the most appropriate approach here, or whether binding would be better as Scott suggested.

karmany Over a year ago

Car is a query's result (LINQ to Dataset). When a user selects "Color" Field (in the query), I want to fill a list (MyListBox) only with the "Color" Field.

Jon Skeet Over a year ago

@karmany : Then that sounds like you should be using binding instead. Set the display property based on the query, but actually populate the listbox with the full Car references.

karmany Over a year ago

Jon, your code shows: "No overload for GetValue method..." I don't know what is "binking instead". I will seek more information.

gudatcomputers Over a year ago

yeah this seems like using symbolic references in Perl... tread carefully.

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