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Updated:03:01 AM CT Jan 10, 2007
Posted:10:13 PM CT Jan 09, 2007

Convert String to Enum Instance

Author: Steve Lautenschlager

SnippetEnumsText and StringsC#.NET

 Summary

Enums are a powerful construction in C# and other programming languages when you are working with finite sets such as fruits, days of the week or colors. Visual Studio's Intellisense is very nice with Enums because it lists all the options for the programmer to choose from. But quite often you want to print enums, compare int values, or serialize an enum--and then you have to do some conversions. The following method may be run in the code-behind file of an ASPX page where you have added a Label control named lblOutput. However, this technique will work in any C# program, not just ASP.NET.

Example: Convert string to Enum instance

public void EnumInstanceFromString()
{
   // The .NET Framework contains an Enum called DayOfWeek.
   // Let's generate some Enum instances from strings.

   DayOfWeek wednesday = 
      (DayOfWeek)Enum.Parse(typeof(DayOfWeek), "Wednesday");
   DayOfWeek sunday = 
      (DayOfWeek)Enum.Parse(typeof(DayOfWeek), "sunday", true);
   DayOfWeek tgif = 
      (DayOfWeek)Enum.Parse(typeof(DayOfWeek), "FRIDAY", true);

   lblOutput.Text = wednesday.ToString() 
      + ".  Int value = " + ((int)wednesday).ToString() + "<br>";
   lblOutput.Text += sunday.ToString() 
      + ".  Int value = " + ((int)sunday).ToString() + "<br>";
   lblOutput.Text += tgif.ToString() 
      + ".  Int value = " + ((int)tgif).ToString() + "<br>";

}
The Enum.Parse method takes two or three arguments. The first is the type of the enum you want to create as output. The second field is the string you want to parse. Without a third input, the case of the input string must match an enum instance or the conversion fails. But the third input indicates whether to ignore case. If true, than wEdNEsDAy will still get converted successfully.

Example: Output

Wednesday. Int value = 3
Sunday. Int value = 0
Friday. Int value = 5

Add New Comment
Convert String to Enum Instance
David H.01 May 08, 13:24Reply 
re: Convert String to Enum Instance
David H.01 May 08, 13:27Reply 
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Steve Lautenschlager (steve)
Steve is the founder and creator of Cambia Research. Developing and maintaining the site combines his passions for technology, writing and education.
Steve holds a Ph.D. in particle physics from Duke University, has worked at CERN, the European center for particle physics (where the web was born) and in Microsoft's web division with microsoft.com, msnbc.com and other web properties. Steve is a web consultant specializing in Microsoft.NET technologies. Read more here.


 
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