Question

I am getting the following error message with the code below. I thought the data type List<double> was the same as double[] but that C# required it to be instantiated using the first syntax for the variable to work as an object. What am I doing wrong or is my thinking wrong?

Cannot implicitily convert type `double[]` to `System.Collections.Generic.List<double>`

Code:

private void RunScript(List<Curve> crv, double nb, ref object DivPts)
  {

    List<double> nbtemp = new List<double>();
    List<double> Divpt = new List<double>();

    for(int i = 0; i < crv.Count;i = i + 2)
    {
      nbtemp = crv[i].DivideByLength(nb, true);
    }

    Divpt = nbtemp;

Answer 1

No, a list is not an array, even though the concepts are somewhat similar. The List<T> class in C# is actually implemented with a behind-the-scenes array.

If you want to set a List from an array, you can use something like this:

nbtemp = new List<double>(crv[i].DivideByLength(nb, true));

that will create a new List, and initialize it with the array. You can also use the AddRange method of the List, if you would like to append an array to an existing list, like this:

nbtemp.AddRange(crv[i].DivideByLength(nb, true));