Compare two strings in C#

Question

I store 2 serialized object in 2 text file and then i read both and store it in 2 different string, and try to compare this 2 strings, the comparison failed more then one time because of the carriage return and new line difference in the end of one of the string, how i could compare both with ignoring spaces or carriage returns, I know I can compress the 2 strings and compare them, but is there anything like done by .net library, Like Icomparer, I'm not sure if this will work for me too.

thank you in advance Jp

What language are you using? Post your code.

user356808
– user356808

2011-01-25 20:34:59 +00:00
Commented Jan 25, 2011 at 20:34 — user356808
– user356808, Commented Jan 25, 2011 at 20:34

Greg Buehler · Accepted Answer · 2011-01-25 20:49:47Z

5

If both values are stored as strings, the String.Trim() function will take care of your troublesome whitespace characters, or just compare whilst replacing the whitespace characters.

        string a = "string comparison\r\n";
        string b = "string comparison";

        string c = a.Trim();
        string d = b.Trim();

        if (c == d)
            Console.WriteLine("strings are equal");
        else
            Console.WriteLine("strings are not equal");

        string e = a.Replace("\r\n", "");
        string f = b.Replace("\r\n", "");

        if (e == f)
            Console.WriteLine("strings are equal");
        else
            Console.WriteLine("strings are not equal");

answered Jan 25, 2011 at 20:49

Greg Buehler

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Comments

Philippe Lavoie · Accepted Answer · 2011-01-25 20:37:30Z

1

A quick work around would be to replace all '\n' and '\r' character by nothing and then compare.

answered Jan 25, 2011 at 20:37

Philippe Lavoie

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2 Comments

jprbest Over a year ago

this is my plan B if no built in function for it

Philippe Lavoie Over a year ago

If there is any built in function, I bet they do replace. You can always create your own compareWithIgniore(string charToIgniore) function.

Lee Louviere · Accepted Answer · 2011-01-25 20:35:43Z

0

If you're reading line by line, just ignore any characters that represent line breaks between them. If you expect line breaks, simply convert to identical characters using a find and replace.

answered Jan 25, 2011 at 20:35

Lee Louviere

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1 Comment

jprbest Over a year ago

No i dont read line by line, I use readtoend function so it store the entire file into a string. and the only problem im facing is in the end of the file some sometime contain \r\n and some not and this why the comparison fails

gbvb · Accepted Answer · 2011-01-25 20:39:55Z

0

You can use a simple Regular Expression that can eliminate the whitespace and compare (or do what Phillippe said). But I dont think there a built-in function to do that kind of comparison.

answered Jan 25, 2011 at 20:39

gbvb

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2 Comments

jprbest Over a year ago

yeh this what I have in mind, i was wondering if there is any built in function

gbvb Over a year ago

Sorry. I have not seen such a thing in .NET. There might be 3rd party libraries...

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