IsNull

Summary

Use == null or != null instead of is null.

Default severity

Info

Description

This rule reports diagnostic information of using is pattern matching with the null constant literal.

Note that the default diagnostic severity of this analyzer is Information.

Code fix

The code fix provides an option replacing expression ... is null and !(... is null) with ... == null and ... != null, respectively.

Remarks

Replacing the expression ... is null with ... == null, as well as replacing !(... is null) with ... != null, can be a breaking change. For more information, refer to the description of EqualsNull code fix.

Example

Diagnostic

public void Method(object o, string s)
{
    if (o is null)
    {
        ⋮
    }
    if (!(s is null))
    {
        ⋮
    }
    ⋮

Code fix

public void Method(object o, string s)
{
    if (o == null)
    {
        ⋮
    }
    if (s != null)
    {
        ⋮
    }
    ⋮