Using strings and enum

Using strings and enum - C# .NET

I've read a few articles recently regarding the use of strings with enums - discussing how to access the constant name values or how to set a variable with the correct value when you only have a string value (enum constant name) - and all present somewhat convoluted ways of achieving this.

I'm guessing the authors are not aware that the .Net framework provides methods for this - out the box.

Hopefully the following code shows how to do this.

private enum CarTypes
{
Lotus = 0,
Morgan = 1,
Atom = 2
}

private void button1_Click(object sender, EventArgs e)
{
CarTypes myCarType = CarTypes.Morgan;
textBox1.Text = Enum.GetName(typeof(CarTypes), myCarType) + ", " + myCarType.ToString() + ", " + (myCarType==CarTypes.Morgan).ToString();

myCarType = (CarTypes)Enum.Parse(typeof(CarTypes), "Atom");
textBox1.Text += "\r\n" + Enum.GetName(typeof(CarTypes), myCarType) + ", " + myCarType.ToString() + ", " + (myCarType == CarTypes.Atom).ToString();

myCarType = (CarTypes)Enum.Parse(typeof(CarTypes), "loTus", true);
textBox1.Text += "\r\n" + Enum.GetName(typeof(CarTypes), myCarType) + ", " + myCarType.ToString() + ", " + (myCarType == CarTypes.Lotus).ToString();
}

Output:

Morgan, Morgan, True
Atom, Atom, True
Lotus, Lotus, True

*** Update ***

For those wanting to know how to get the enum type based on the integer value, you can simply cast it eg:

int carTypeInteger = 1;
CarTypes carType = (CarTypes)carTypeInteger;

carType would be set to Morgan

and visa-versa:
int carTypeInteger = (int)CarTypes.Morgan;

carTypeInteger would be set to 1

Simple stuff
Tim

posted on Tuesday, September 18, 2007 3:47 AM

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# re: Using strings and enum - C# .NET 9/18/2007 12:00 PM Mike

Can only guess at the articles you have read as you don't link to them, but the couple I've seen recently were trying to put characters such as spaces in the description, which you can't do "out of the box".

# re: Using strings and enum - C# .NET 2/11/2008 3:37 AM Hasib Muyen

Thanks a lot. It saved me a lot of time.

# re: Using strings and enum - C# .NET 2/14/2008 2:40 PM Aaron

Thanks for this, its exactly what I was after! Good work.

# re: Using strings and enum - C# .NET 2/16/2008 3:45 AM therese

can i ask some help??

# re: Using strings and enum - C# .NET 2/18/2008 6:27 AM asdf

your a geek but make enums with CAPS

# re: Using strings and enum - C# .NET 2/29/2008 5:50 PM CMG

How about a more practical example that demonstrates resolving the numeric enum value.
Instead of this:
CarTypes myCarType = CarTypes.Morgan;
Declare as:
CarTypes myCarType = 1;
... which in a real application would come from raw data.

# re: Using strings and enum - C# .NET 7/14/2008 5:49 PM mukesh

hi
this is very good comments
i am very thankingful to you

# re: Using strings and enum - C# .NET 9/29/2008 9:15 AM Mark

Obviously you are not aware of the reason the authors of the articles you have been reading are proposing these "convoluted" methods. It is because "out of the box", .NET enums do not support string values, and thereby, also do not support getting the enum element from a string value.

For example, you cannot do

public enum MessageType
{
ADMINISTRATIVE = "AD",
INQURIY = "IQ"
}

In this example, you cannot override the toString() method with anything out of the box. And you cannot get the ADMINISTRATIVE element from the string value "AD" with any out of the box capability.

Functionality like this is often necessary in the situations in which you would like to use enums, and since this functionality is not possible out of the box, some authors have preseneted their work arounds to achieve this functionality.

# re: Using strings and enum - C# .NET 1/22/2009 5:24 AM Peter

Good work

# re: Using strings and enum - C# .NET 2/25/2009 7:05 AM Cory

I know this post is from a while back but with .NET 3.5 this is possible (but sorta gross) through extension methods:

public enum LoggingLevel
{
Debug,
Error,
Warning,
Information
}

public static class ExtensionMethods
{
public static string ToString(this LoggingLevel loggingLevel)
{
string retVal = string.Empty;
switch (loggingLevel)
{
case LoggingLevel.Debug:
{
retVal = "*D*";
break;
}
case LoggingLevel.Error:
{
retVal = "*E*";
break;
}
case LoggingLevel.Information:
{
retVal = "*I*";
break;
}
case LoggingLevel.Warning:
{
retVal = "*W*";
break;
}
}
return retVal;
}
}

# re: Using strings and enum - C# .NET 5/16/2009 7:28 PM anollipian

hey good topic
Thanks :)

# re: Using strings and enum - C# .NET 5/31/2009 4:34 AM Kris29

gr8 article !!!

# re: Using strings and enum - C# .NET 6/4/2009 12:02 AM almny

thanks man
can i know hot to convert from enum items to int ?

# re: Using strings and enum - C# .NET 7/2/2009 12:01 PM anon

Nice job Cory. Tim - I would spend a bit more time looking at problems people are having and the reasoning behind it.

# re: Using strings and enum - C# .NET 8/13/2009 12:02 AM CockFucker

Take it up the arse you dog fucker

# re: Using strings and enum - C# .NET 9/11/2009 12:39 PM Developer

good one!! apt solution for my problem

# re: Using strings and enum - C# .NET 10/26/2009 4:01 PM Damian

Great overview.. very clean solution to my problem

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