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How to Toggle String Case in .NET

, 14 Feb 2011 CPOL
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Shows how to toggle the contents of a string from upper case to lower, or vice versa
The following snippet shows how to toggle string casing in .NET:

public string ToggleCase(string input)
{
    string result = string.Empty;
    char[] inputArray = input.ToCharArray();
 
    foreach (char c in inputArray)
    {
        if (char.IsLower(c))
            result += c.ToString().ToUpper();
        else if (char.IsUpper(c))
            result += c.ToString().ToLower();
        else
            result += c.ToString();
    }
 
    return result;
}

This code snippet could be simplified as follows:
public string ToggleCase(string input)
{
    string result = string.Empty;
    char[] inputArray = input.ToCharArray();
    foreach (char c in inputArray)
    {
        if (char.IsLower(c))
            result += Char.ToUpper(c);
        else
            result += Char.ToLower(c);
    }
    return result;
}

But still performance of Alternate 1 and Alternate 2 is 2...3 times better than of this one: see the online comparative test at: http://webinfocentral.com/resources/toggleCaseAlgorithm.aspx[^]

Regards,
Alex Bell

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Manas Bhardwaj
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Comments and Discussions

 
GeneralRe: 1. Thanks for your note: I typically use "Add comment" becau... Pin
DrABELL, 23-Feb-11 16:23
memberDrABELL23-Feb-11 16:23 
GeneralReason for my vote of 1 result = instead of StringBuilder Pin
Selvin, 9-Dec-11 6:57
memberSelvin9-Dec-11 6:57 
GeneralAre you going to add the other alternatives to your webinfoc... Pin
SimmoTech, 24-Mar-11 0:06
memberSimmoTech24-Mar-11 0:06 
GeneralGot the highest number of alternatives.. I have not seen cod... Pin
Pravin Patil, Mumbai, 8-Mar-11 23:47
memberPravin Patil, Mumbai8-Mar-11 23:47 
GeneralTwo fastest Toggle Case Algorithms (Ayoola-Bell and Bell-Ned... Pin
DrABELL, 23-Feb-11 10:01
memberDrABELL23-Feb-11 10:01 
GeneralRe: I know, I was just saying that those faster solutions do not... Pin
AspDotNetDev, 23-Feb-11 13:51
protectorAspDotNetDev23-Feb-11 13:51 
GeneralReason for my vote of 5 I am giving my vote of 5 because the... Pin
DrABELL, 14-Feb-11 18:29
memberDrABELL14-Feb-11 18:29 
GeneralRe: Actually, the performance can be increased by a multiple of ... Pin
AspDotNetDev, 23-Feb-11 8:57
protectorAspDotNetDev23-Feb-11 8:57 
General[edit] made variable names more C#-ish. (no vote from me, b... Pin
Indivara, 14-Feb-11 15:08
subeditorIndivara14-Feb-11 15:08 
GeneralReason for my vote of 5 the way to toggle the string is opti... Pin
shadi_abushaar, 13-Feb-11 2:54
membershadi_abushaar13-Feb-11 2:54 
GeneralRe: you have a strange idea of "optimal"... Pin
Seishin#, 9-Dec-11 1:16
memberSeishin#9-Dec-11 1:16 
GeneralReason for my vote of 3 Neat idea, poorly implemented. Appen... Pin
AspDotNetDev, 9-Feb-11 15:01
protectorAspDotNetDev9-Feb-11 15:01 
GeneralAs FYI: High Resolution timer added to the test page Pin
DrABELL, 25-Feb-11 14:40
memberDrABELL25-Feb-11 14:40 
GeneralSuggestion: to post a summary of this discussion, highlighting the best Algorithms Pin
DrABELL, 24-Feb-11 15:32
memberDrABELL24-Feb-11 15:32 
GeneralRe: Suggestion: to post a summary of this discussion, highlighting the best Algorithms Pin
Manas Bhardwaj, 25-Feb-11 1:52
memberManas Bhardwaj25-Feb-11 1:52 
QuestionWhy? Pin
Andrew Rissing, 10-Feb-11 4:57
memberAndrew Rissing10-Feb-11 4:57 
AnswerRe: Why? Pin
Manas Bhardwaj, 10-Feb-11 5:12
memberManas Bhardwaj10-Feb-11 5:12 
GeneralRe: Why? Toggle Case option is included in MS Word, it's a valuable feature Pin
DrABELL, 24-Feb-11 5:19
memberDrABELL24-Feb-11 5:19 
AnswerRe: Why? Pin
DrABELL, 14-Feb-11 17:25
memberDrABELL14-Feb-11 17:25 
GeneralRe: Why? Pin
Andrew Rissing, 15-Feb-11 5:27
memberAndrew Rissing15-Feb-11 5:27 
GeneralRe: Why? Pin
DrABELL, 15-Feb-11 9:46
memberDrABELL15-Feb-11 9:46 
GeneralRe: Why? Pin
damnedyankee, 24-Feb-11 2:27
memberdamnedyankee24-Feb-11 2:27 
GeneralRe: Why? Pin
DrABELL, 24-Feb-11 3:22
memberDrABELL24-Feb-11 3:22 
GeneralRe: Why? Pin
damnedyankee, 24-Feb-11 4:34
memberdamnedyankee24-Feb-11 4:34 
GeneralRe: Why? Pin
DrABELL, 24-Feb-11 5:11
memberDrABELL24-Feb-11 5:11 

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