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Diagnostics Warning STRDIAG009

The member '{0}' implements IDictionary<T,K> with an unsupported type for the key. Only primitive types ( like int,float,.. ) are supported or string or enums as the Dictionary Key in asset serialization. When used in other contexts the warning may not apply and can be suppressed.

Explanation

By default, Stride serializers only support primitive types and string as keys in an IDictionary. However, it is possible to extend this support, making the warning not entirely accurate in all cases.

Example

The following example generates STRDIAG009:

using Stride.Core;

public class STRDIAG009
{
    [DataMember]
    public Dictionary<ClassType, AnyType>

    [DataMember]
    public Dictionary<StructType, AnyType>

    [DataMember]
    public Dictionary<InterfaceType, AnyType>
}

Solution

To resolve the warning, remove the DataMemberAttribute or add DataMemberIgnoreAttribute. Or change the key of the IDictionary to a supported type. Add a pragma Suppression in the IDE if it is a valid type.

References

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