MsgPack004 Attribute public members of MessagePack objects

Public members of MessagePackObjectAttribute-attributed types require either KeyAttribute or IgnoreMemberAttribute.

Examples of patterns that are flagged by this analyzer

[MessagePackObject]
public class C {
    [Key(0)]
    public int A { get; set; }

    public int B { get; set; } // MsgPack004
}

Typical fix

Indicate that the unattributed member should be serialized:

[MessagePackObject]
public class C {
    [Key(0)]
    public int A { get; set; }

    [Key(1)]
    public int B { get; set; }
}

An automated code fix is available for this.

Alternative fix

If the unattributed member should not be serialized, apply the [IgnoreMember] attribute:

[MessagePackObject]
public class C {
    [Key(0)]
    public int A { get; set; }

    [IgnoreMember]
    public int B { get; set; }
}