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V3071. The object is returned from insi…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
OWASP errors (C#)
Additional information
Contents

V3071. The object is returned from inside 'using' block. 'Dispose' will be invoked before exiting method.

Mar 02 2016

The analyzer detected that a function returns an object that is being used in the 'using' statement.

Consider the following example:

public FileStream Foo(string path)
{
  using (FileStream fs = File.Open(path, FileMode.Open))
  {
    return fs;
  }
}

Since the variable was initialized in the using block, method Dispose will be called for this variable before exiting the function. Therefore, it may not be safe to use the object that will be returned by the function.

The Dispose method will be called because the code above will be modified by the compiler into the following code:

public FileStream Foo(string path)
{
  FileStream fs = File.Open(path, FileMode.Open)
  try
  {
    return fs;
  }
  finally
  {
    if (fs != null)
      ((IDisposable)fs).Dispose();
  }
}

The fixed version may look something like this:

public FileStream Foo(string path)
{
  return File.Open(path, FileMode.Open)
}
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