Diagnostics Warning STRDIAG003

The member '{0}' with [DataMember] is not accessible to the serializer. Only public/internal/internal > protected visibility is supported, when the [DataMember] attribute is applied.

Explanation

The serialization concept in Stride expects public/internal/internal protected visibility of properties. Other accessibility won't be considered for serialization. To count internal/internal protected as visible to the Editor the DataMemberAttribute has to be applied, else it's considered as not visible.

Example

The following example generates STRDIAG003 on each property:

using Stride.Core;

public class STRDIAG003
{
    [DataMember]
    private int Value { get; set; }

    [DataMember]
    protected string Value;
    
    [DataMember]
    private protected string Value;
}

Solution

To resolve the warning, increase the Accessibility to public/internal/internal protected of the member or remove the DataMemberAttribute Attribute.