Dead stores refer to assignments made to local variables that are subsequently never used or immediately overwritten. Such assignments are unnecessary and don’t contribute to the functionality or clarity of the code. They may even negatively impact performance. Removing them enhances code cleanliness and readability. Even if the unnecessary operations do not do any harm in terms of the program’s correctness, they are - at best - a waste of computing resources.
No issue is reported when
try blocks -1, 0, 1, null, true, false,
"" or string.Empty Remove the unnecessary assignment, then test the code to make sure that the right-hand side of a given assignment had no side effects (e.g. a method that writes certain data to a file and returns the number of written bytes).
You can also use discards (rather than a variable) to express that result of a method call is ignored on purpose.
int Foo(int y)
{
int x = 100; // Noncompliant: dead store
x = 150; // Noncompliant: dead store
x = 200;
return x + y;
}
int Foo(int y)
{
int x = 200; // Compliant: no unnecessary assignment
return x + y;
}