V3008. The 'x' variable is assigned values twice successively. Perhaps this is a mistake.

The analyzer has detected an error that has to do with assigning values to one and the same variable twice in a row, while this variable is not used in any way between the assignments.

Consider this example:

A = GetA();
A = GetB();

The 'A' variable being assigned values twice might indicate a bug. The code should have most probably looked like this:

A = GetA();
B = GetB();

Cases when the variable is used between the assignments are treated as correct and do not trigger the warning:

A = 1;
A = Foo(A);

The following is an example of the bug taken from a real-life application:

if (bool.TryParse(setting, out value))
    _singleSignOn = value;
_singleSignOn = false;

A correct version of this code should look like this:

if (bool.TryParse(setting, out value))
    _singleSignOn = value;
    _singleSignOn = false;

The analyzer might output false positives sometimes. This happens when such variable assignments are used for debugging purposes. For example:

status = Foo1();
status = Foo2();

The false positive in this code can be handled in a number of ways:

  • You can suppress it by inserting comment "//-V3008".
  • You can forbid the analyzer to output diagnostic V3008 for any case where variable 'status' is used. To do that, insert comment "//-V:status:3008".
  • You can remove idle assignments from the code.
  • Perhaps this code is incorrect, so we have to check the value of the 'status' variable.

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