Filtering objects by their types in C#

Rhino Developer
1

Hello Everyone,

I have a list of objects. I want to filter the objects by their type. Can someone guide me how to do it with GetType() command?

2020-06-23 19_34_15-Grasshopper - TripleHexagonWeaving (3)_

3

Like this?

private void RunScript(List<object> things, ref object A, ref object B)
{ 
var dic = new Dictionary<Guid, List<int>>();
for (int i = 0; i < things.Count; i++)
{
  var id = things[i].GetType().GUID;
  if(dic.ContainsKey(id)){
    dic[id].Add(i);
  }else{
    dic.Add(id, new List<int>(){i});
  }
}

var res = new DataTree<object>();
var map = new DataTree<int>();
var j = 0;
foreach(var kvp in dic)
{
  var path = new GH_Path(this.Iteration, j);
  foreach(var i in kvp.Value)
  {
    res.Add(things[i], path);
  }
  map.AddRange(kvp.Value, path);
  j++;
}

A = res;
B = map;

}
4

GroupByGhType
GroupByGhType1206×816 56.6 KB

private void RunScript(List<System.Object> data, ref object A, ref object B)
{
  var types = new DataTree<string>();
  var objects = new DataTree<object>();
  var i = 0;
  foreach(var grp in data.GroupBy(d => GH_Convert.ToGoo(d).TypeName))
  {
    var path = new GH_Path(i);
    types.Add(grp.Key, path);
    foreach(var o in grp)
      objects.Add(o, path);
    i++;
  }
  A = types;
  B = objects;
}

GroupByGhType.gh (25.8 KB)

1 Like
5

Thanks. Can you please explain here to me? >>>>
data.GroupBy(d => GH_Convert.ToGoo(d).TypeName))

1 Like
6

GH_Convert.ToGoo: Converts an object into Goo.
GH_GooProxy.TypeName: Returns the type name that the object represents.
Enumerable.GroupBy: Groups the elements of a sequence according to a specified key selector function.

1 Like