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V3197. The compared value inside the 'Object.Equals' override is converted to a different type that does not contain the override.
The analyzer detected a potential error related to checking an incorrect type in the overridden 'Equals' method.
Look at the example:
private class FirstClass
{
....
public override bool Equals(object obj)
{
SecondClass other = obj as SecondClass; // <=
if (other == null)
{
return false;
}
return Equals(other);
}
public bool Equals(FirstClass other)
{
....
}
}In the overridden 'Equals' method of the 'FirstClass' class, an error occurs when checking the 'obj' type. The 'FirstClass' type should be used instead of the 'SecondClass' type.
As a result, if an object of the 'FirstClass' type is passed to the overridden 'Equals' method, the method always returns 'false'.
Moreover, if an object of the 'SecondClass' type is passed as a parameter, the same overridden 'Equals' method is called. It results in recursion and a 'StackOverflowException'.
Let's look at the fixed version:
private class FirstClass
{
....
public override bool Equals(object obj)
{
FirstClass other = obj as FirstClass;
if (other == null)
{
return false;
}
return Equals(other);
}
}This diagnostic is classified as:
You can look at examples of errors detected by the V3197 diagnostic. |
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