Run multiple tasks async??

MKa

I am attempting to update a layout template by iterating through the text elements and changing the values of the template to something about the users map/settings.

I am able to loop through and change all the text elements, but I want to do all of the text elements at the same time.  I have a list of all the elements and the changes I want to make to each of them, but they always seem to run syncronously instead of in parellel?  What am i missing here?  The SetTextProperties is slow so I want to do about al 50 updates in parellel?

 //I have a list of object TextElementUpdate and updates to them
var tasks = new List<Task>();
                foreach (TextElementUpdate teu in textElementUpdates)
                {
//Shouldn't this line happen instantly and the whenall will wait?
//This line I want in parellel, so like 50 running at once, instead it is sync
                    tasks.Add(teu.UpdateTextElement());
                }

                //Wait for all the tasks to finish
                await Task.WhenAll(tasks);


//-------------------------------------------------------------------
class TextElementUpdate
        {
            public TextElementUpdate(TextElement textElement, TextProperties textProperties)
            {
                TextElementToUpdate = textElement;
                NewTextProperties = textProperties;
            }
            public TextElement TextElementToUpdate { get; set; }
            public TextProperties NewTextProperties { get; set; }

            public Task UpdateTextElement()
            {
                return QueuedTask.Run(() =>
                {
                    TextElementToUpdate.SetTextProperties(NewTextProperties);
                });
            }
        }

 

CharlesMacleod

you might be better off going against the layout CIM definition. See the code snippet below.

 

  var layout = LayoutView.Active?.Layout;
  if (layout == null)
    return;
  await QueuedTask.Run(() =>
  {
    var def = layout.GetDefinition() as CIMLayout;
    var graphic_elements = def.Elements.OfType<CIMGraphicElement>().ToList() 
          ??  new List<CIMGraphicElement>();
    bool changed = false;
    var when = DateTime.Now.ToString("G");
    int c = 0;
    foreach (var ge in graphic_elements)
    {
      if (ge.Graphic is CIMTextGraphic textGraphic) 
      {
           textGraphic.Text = $"Changed {c++}, {when}";
           changed = true;
      }
     }
     if (changed)
       //commit the changes
       layout.SetDefinition(def);
   });

 

If u want to find out more about the CIM take a look at this video:

ArcGIS Pro SDK for .NET: Understanding the CIM, a Guide for Developers