Metadata

ID: csharp-best-practices/do-not-initialize-threadstatic

Language: C#

Severity: Error

Category: Best Practices

Description

When a field has the ThreadStatic attribute, it is unique for each thread. In order to have the expected value, the field should either be evaluated lazily, or set to the default.

Non-Compliant Code Examples

class NonCompliant {
    [ThreadStatic]
    public static string Foo = "foo";
}

Compliant Code Examples

class Compliant {
    [ThreadStatic]
    private static string _foo;
    
    public static string Foo {
        get {
            if (_foo == null) {
                _foo = "foo"
            }
            return _foo;
        }
    }
}

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