codeql/csharp/ql/test/query-tests/Likely Bugs/StaticFieldWrittenByInstance/StaticFieldWrittenByInstance.cs

using System;

class StaticFields
{
    static int staticField;
    int instanceField;

    static StaticFields()
    {
        staticField = 0;    // OK
    }

    StaticFields()
    {
        staticField = 0;    // BAD
        instanceField = 0;  // OK
    }

    static void StaticTest()
    {
        staticField = 0;    // OK
    }

    void InstanceTest()
    {
        staticField = 0;    // BAD
        instanceField = 0;  // OK
    }

    static object backingField;
    static object StaticProp
    {
        get
        {
            return backingField ?? (backingField = new object()); // OK
        }
    }

    object Prop
    {
        get
        {
            return backingField ?? (backingField = new object()); // BAD
        }
    }
}