V3122. Uppercase (lowercase) string is compared with a different lowercase (uppercase) string.


The analyzer detected a comparison of two strings whose characters are in different cases. Consider the following example:

void Some(string s)
{
  if (s.ToUpper() == "abcde")
  {
    ....
  }
}

After casting the 's' variable's value to upper case, the resulting string is compared with a string where all the characters are lowercase. As this comparison is always false, this code is incorrect and can be fixed in the following way:

void Some(string s)
{
  if (s.ToLower() == "abcde")
  {
    ....
  }
}

Consider another example:

void Some()
{
  string s = "abcde";
  ....
  if (s.Contains("AbCdE"))
  {
    ....
  }
}

While all the characters of the 's' variable's value are lowercase, an attempt is made to check if the string contains a mixed-case substring. Obviously, the 'Contains' method will always return 'false', which also indicates an error.

According to Common Weakness Enumeration, potential errors found by using this diagnostic are classified as CWE-570.


Bugs Found

Checked Projects
336
Collected Errors
12 743