string s = "value_test_this";
string m = s.Replace('e','E');
StringBuilder strBuilder = new StringBuilder("value_test_this");
strBuilder.Replace('e','E');
since strings are immutable, how does the Replace works in string class,
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Check this post will explain the things to you which you want Why to use StringBuilder over string to get better performancePranay Rana– Pranay Rana2011-04-27 08:11:41 +00:00Commented Apr 27, 2011 at 8:11
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2 Answers
It creates another string in the memory and then points the m to that new string. The old string also stays in the memory.
And that is exactly why StringBuilder should be used if frequent modifications have to be made to the string.
If you want to know why Strings are immutable in C#, look at this SO discussion
1 Comment
Graham Clark
This is wrong -
s is definitely not pointed to the new string. The Replace method, along with many other string methods, creates a brand new string based on some logic, and returns this new string. s remains unchanged. The variable m is a reference to the new string. You need to replace s with m in your answer.If you do a string.Replace it's simply going to create a new string (since, as you said, it is immutable). In StringBuilder there's no new string being created, the one you have gets modified.
