You need to compare the contents of two strings for equality. In addition, the case sensitivity of the comparison needs to be controlled.
Use the
Compare
static
method on the string
class to compare the two
strings. Whether the comparison is case-insensitive is determined by
the third parameter of one of its overloads. For example:
string lowerCase = "abc"; string upperCase = "AbC"; int caseSensitiveResult = string.Compare(lowerCase, upperCase, false); int caseInsensitiveResult = string.Compare(lowerCase, upperCase, true);
The caseSensitiveResult
value is
-1
(indicating that lowerCase
is “less than”
upperCase
) and the
caseInsensitiveResult
is zero (indicating that
lowerCase
“equals”
upperCase
).
Using the static string.Compare
method allows us
the freedom to choose whether to take into account the case of the
strings when comparing them. This method returns an integer
indicating the lexical relationship between the two strings. A zero
means that the two strings are equal, a negative number means that
the first string is less than the second string, and a positive
number indicates that the first string is greater than the second
string.
By setting the last parameter of this method (the
IgnoreCase
parameter) to
true
or false
, we can determine
whether the Compare
method takes into account the
case of both strings when comparing. Setting this parameter to
true
forces a case-insensitive comparison and
setting this parameter to false
forces a
case-sensitive comparison. In the case of the overloaded version of
the method with no IgnoreCase
parameter,
comparisons are always case-sensitive.