如何返回属性的默认值?

我有以下Graphql类型类,包括POCO类: Order.cs .

这里我想设置每个字段的默认值。例如 Name 我想返回“No Name”,以防没有返回值。万一 Created

public class OrderType : ObjectGraphType<Order>
{
    public OrderType(ICustomerService customers)
    {
        Field(o => o.Id);
        Field(o => o.Name);
        Field(o => o.Description);
        Field(o => o.Created);
    }
}

public class Order
{
    public Order(string name, string description, DateTime created, string Id)
    {
        Name = name;
        Description = description;
        Created = created;
        this.Id = Id;
    }

    public string Name { get; set; }

    public string Description { get; set; }

    public DateTime Created { get; private set; }

    public string Id { get; private set; }
}

有人能帮我解决这个问题吗?