LINQ-根据集合属性选择匿名类型

Question

I have the following Class:

public class DistributionItem
{

    public int DeviceID { get; set; }
    public string DeviceName { get; set; }
    public double? Export { get; set; }
    public double? Import { get; set; }
    public List<double?> Tarrifs { get; set; }
    public bool HasChild { get; set; }
    public int OrderNum { get; set; }
    public double PF { get; set; }
    public int? MaxDmd { get; set; }
    public string ImageUrl { get; set; }
    public int ParentID { get; set; }
    public double? Total { get; set; }
}

I want to make a LINQ Select over a List of this class to pull-out some of the properties like this:

        return data.Select(x => new
        {
            x.DeviceID,
            x.DeviceName,
            x.HasChild,
            x.KwhImport,
            x.KwhExport,
            x.MaxDmd,
            x.ParentID
        }).ToList();

How can I add the Tarrifs values as separate properties to the anonymous object?

Answer 1

You can't, unless you know the number of items in the list at compile time. The idea of anonymous types is that they're statically typed . The compiler knows, at compile time, what all of the properties and their types are. You can't use one if you don't know that information.

If you know that there are, for example, always two items, then you can do something like:

return data.Select(x => new
{
    x.DeviceID,
    x.DeviceName,
    x.HasChild,
    x.KwhImport,
    x.KwhExport,
    x.MaxDmd,
    x.ParentID,
    Tarrifs1 = x.Tarrifs[0],
    Tarrifs2 = x.Tarrifs[1],
}).ToList();