Having all branches in a switch or if chain with the same implementation is an error. Either a copy-paste error was made and something different should be executed, or there shouldn’t be a switch/if chain at all.

Noncompliant Code Example

if (b == 0)  // Noncompliant
{
    DoTheThing();
}
else
{
    DoTheThing();
}

int b = a > 12 ? 4 : 4;  // Noncompliant

switch (i) // Noncompliant
{
    case 1:
        DoSomething();
        break;
    case 2:
        DoSomething();
        break;
    case 3:
        DoSomething();
        break;
    default:
        DoSomething();
}

Exceptions

This rule does not apply to if chains without else-s, or to switch-es without default clauses.

if (b == 0)    //no issue, this could have been done on purpose to make the code more readable
{
    DoSomething();
}
else if (b == 1)
{
    DoSomething();
}