在C＃中将double？[]转换为object []

Question

I am using DotNet.Highcharts in my C# program. The data element for series items requires an object[] . The data I'm using is coming from a LINQ method as shown below. The code below also converts the double?[] to a List<object> then to the desired object[] .

double?[] data = (from c in context.CTSeries
                 select c.CTDI).Take(1000).ToArray();

List<object> dataList = new List<object>();

foreach (double? ctdi in data)
{
    dataList.Add( Convert.ChangeType(ctdi, typeof(Object)));
}

object[] dataArray = dataList.ToArray();
return dataArray;

Is there a better/more efficient way of getting the object[] from a double?[] ?

Answer 1

Use LINQ and cast double? to object

List<object> dataList = data.Select(d => (object)d).ToList();

or to return an array

return data.Select(d=> (object)d).ToArray();

Answer 2

You can just Cast<object>() instead of creating extra intermediate array:

 double?[] data = (from c in context.CTSeries
                     select c.CTDI).Take(1000)
     .Where(v => v.HasValue) // if needed
     .Cast<object>()
     .ToArray();

Answer 3

List<object> dataList = data.Select(d =>  d == null ? null : (object)d).ToList();