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If the returned value is true, the field can only be initialized, and is read-only thereafter.
To get the IsInitOnly property, first get the class Type. From the Type, get the FieldInfo. From the FieldInfo, get the IsInitOnly property. To access a non-public field, combine BindingFlags.NonPublic with either or both of BindingFlags.Static and BindingFlags.Instance in the GetField method.
The IsInitOnly property is set when the FieldAttributes.InitOnly attribute is set.