CA2019Reliability Enabled by default: As suggestion

ThreadStatic fields should not use inline initialization

Description

System.ThreadStaticAttribute fields should be initialized lazily on use and not with inline initialization or explicitly in a static (Shared in Visual Basic) constructor. A static constructor only initializes the field on the thread that runs the type's static constructor.

Cause

A field that's annotated with System.ThreadStaticAttribute is initialized inline or explicitly in a static (Shared in Visual Basic) constructor.

Example

class C
{
    [ThreadStatic]
    private static Object obj = new();
}

class C
{
    [ThreadStatic]
    private static Object obj;

    static void S1()
    {
        obj ??= new Object();
    }
}

When to suppress

It's safe to suppress a warning from this rule, but your app might exhibit unexpected behavior.

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