C#•2mo ago

✅ Required Member must be set in the object initializer or attribute constructor

new PresetDataModel(preset)

new PresetDataModel(preset)

give a compile error

Severity    Code    Description    Project    File    Line    Suppression State
Error    CS9035    Required member 'PresetDataModel.Name' must be set in the object initializer or attribute constructor.

Severity    Code    Description    Project    File    Line    Suppression State
Error    CS9035    Required member 'PresetDataModel.Name' must be set in the object initializer or attribute constructor.

the class in question

public class PresetDataModel
{
    public PresetDataModel(ToppingPreset preset)
    {
        Id = preset.Id;
        Name = preset.Name;
        foreach(var topping in preset.Toppings)
        {
            ToppingToValuePairs.Add(new ToppingToValuePair()
            {
                ToppingId = topping.ToppingId,
                ToppingValueId = topping.ToppingValueId,
            });
        }
    }
    public Guid Id { get; set; }
    public required string Name { get; set; }
    public List<ToppingToValuePair> ToppingToValuePairs { get; set; } = new List<ToppingToValuePair>();

}

public class PresetDataModel
{
    public PresetDataModel(ToppingPreset preset)
    {
        Id = preset.Id;
        Name = preset.Name;
        foreach(var topping in preset.Toppings)
        {
            ToppingToValuePairs.Add(new ToppingToValuePair()
            {
                ToppingId = topping.ToppingId,
                ToppingValueId = topping.ToppingValueId,
            });
        }
    }
    public Guid Id { get; set; }
    public required string Name { get; set; }
    public List<ToppingToValuePair> ToppingToValuePairs { get; set; } = new List<ToppingToValuePair>();

}

if my constructor sets it, why do I get the compile error? Is there some way to avoid besides the following

new PresetDataModel(preset) { Name = preset.Name }

new PresetDataModel(preset) { Name = preset.Name }

4 Replies

333fred•2mo ago

Don't mark the property with required if the only constructor on the type is going to set it The point of required is to shift the responsibility of initializing a property to the person using the constructor If there's only one constructor, and it takes care of it, then you don't need required

KakuregaRamen•2mo ago

I see thanks

333fred•2mo ago

You're welcome. If you have any other questions about required feel free to ask, otherwise you can go ahead and $close this thread 🙂

MODiX•2mo ago

If you have no further questions, please use /close to mark the forum thread as answered

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✅ Required Member must be set in the object initializer or attribute constructor