Our website uses cookies to enhance your browsing experience.
Accept
to the top
close form

Fill out the form in 2 simple steps below:

Your contact information:

Step 1
Congratulations! This is your promo code!

Desired license type:

Step 2
Team license
Enterprise license
** By clicking this button you agree to our Privacy Policy statement
close form
Request our prices
New License
License Renewal
--Select currency--
USD
EUR
* By clicking this button you agree to our Privacy Policy statement

close form
Free PVS‑Studio license for Microsoft MVP specialists
* By clicking this button you agree to our Privacy Policy statement

close form
To get the licence for your open-source project, please fill out this form
* By clicking this button you agree to our Privacy Policy statement

close form
I am interested to try it on the platforms:
* By clicking this button you agree to our Privacy Policy statement

close form
check circle
Message submitted.

Your message has been sent. We will email you at


If you haven't received our response, please do the following:
check your Spam/Junk folder and click the "Not Spam" button for our message.
This way, you won't miss messages from our team in the future.

>
>
>
V3115. It is not recommended to throw e…
menu mobile close menu
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Micro-Optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
Customer specific requests (C++)
MISRA errors
AUTOSAR errors
OWASP errors (C#)
Problems related to code analyzer
Additional information
toggle menu Contents

V3115. It is not recommended to throw exceptions from 'Equals(object obj)' method.

Aug 30 2016

The analyzer detected that overridden method 'Equals(object obj)' might throw an exception.

Consider the following example:

public override bool Equals(object obj)
{
  return obj.GetType() == this.GetType();
}

If the 'obj' argument is null, a 'NullReferenceException' will be thrown. The programmer must have forgotten about this scenario when implementing the method. Use a null check to make this code work properly:

public override bool Equals(object obj)
{
  if (obj == null)
    return false;

  return obj.GetType() == this.GetType();
}

Another poor practice when implementing the 'Equals(object obj)' method is to explicitly throw an exception from it. For example:

public override bool Equals(object obj)
{
    if (obj == null)
        throw new InvalidOperationException("Invalid argument.");

    return obj == this;
}

This method is very likely to be called in such a block of code where exception throwing and handling are not expected.

If one of the objects does not meet the conditions, return 'false':

public override bool Equals(object obj)
{
    if (obj == null)
        return false;

    return obj == this;
}

This diagnostic is classified as:

You can look at examples of errors detected by the V3115 diagnostic.