Equals(String, String, StringComparison) ?

  • Thread starter Thread starter csharper
  • Start date Start date
C

csharper

While I was browsing at MSDN, at http://msdn.microsoft.com/en-us/library/bb546166.aspx
, I happen to see some community comments:

<quote>
In the above Linq query. Better performance would be achieved by using
string.Equals() with a StringComparison enumerable as below.

var matchQuery = from word in source
where string.Equals(word, searchTerm,
StringComparison.InvariantCultureIgnoreCase)
select word;

</quote>

Is this real that Equals(String, String, StringComparison) has better
performance than = ?
 
While I was browsing at MSDN, at http://msdn.microsoft.com/en-us/library/bb546166.aspx
, I happen to see some community comments:

<quote>
In the above Linq query. Better performance would be achieved by using
string.Equals() with a StringComparison enumerable as below.

var matchQuery = from word in source
where string.Equals(word, searchTerm,
StringComparison.InvariantCultureIgnoreCase)
select word;

</quote>

Is this real that Equals(String, String, StringComparison) has better
performance than = ?
Click to expand...

It is true, because it avoids creating two new String
objects per comparison.

In most cases the overall performance impact
will be insignificant.

But the suggestion fits rather well with Microsofts
recommendations:

http://msdn.microsoft.com/en-us/library/dd465121.aspx#the_details_of_string_comparison

Arne
 
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