Automatic name according to the number of passes

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Hello community, I have one question. Is there an easy way to add a number based on the number of passes?
For exampe:
first

if (contains == true)
                       {
                           var newPolygon0 =
                               PolygonBuilder.CreatePolygon(seg, polygonDefinition.GetSpatialReference());
                           createOperation.Create(polygLayer, newPolygon0);
                       }

second

if (contains == true)
                 {
                     var newPolygon1 =
                         PolygonBuilder.CreatePolygon(seg, polygonDefinition.GetSpatialReference());
                     createOperation.Create(polygLayer, newPolygon1);
                 }

68th

if (contains == true)
                 {
                     var newPolygon67 =
                         PolygonBuilder.CreatePolygon(seg, polygonDefinition.GetSpatialReference());
                     createOperation.Create(polygLayer, newPolygon67);
                 }

I will be happy for any advice or solutions.
Thank you

What I have tried:

C#

List<Polygon> sortedList = list.OrderByDescending(o => o.Area).ToList();
                   for (int i = 1; i < list.Count; i++)
                   {
                       var contains = GeometryEngine.Instance.Contains(sortedList[0], sortedList[i]);
                       if (contains == true)
                       {
                           var newPolygon =
                               PolygonBuilder.CreatePolygon(seg, polygonDefinition.GetSpatialReference());
                           createOperation.Create(polygLayer, newPolygon);
                       }

Posted 22-Nov-21 1:58am

dejf111

Updated 22-Nov-21 19:59pm

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Comments

PIEBALDconsult 22-Nov-21 9:06am

Maybe in a scripting language, but not in a "real" language.
"Real" languages have better ways of doing things.

See also: Associative Array

3 solutions

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BillWoodruff · Answer 1 · 2021-11-22T19:59:00

If you are handling different 'Layers, each of which contains 'Polygons. I suggest you create classes or data-structures to keep track of them: then, you can easily access summary information using Linq.

using System.Collections.Generic;
using System.Linq;

namespace YourNameSpace
{
    public class LayerManager
    {
        public string Name { get; }
        public List<Layer> Layers { get; }

        public LayerManager(string lmname = "")
        {
            Name = lmname;
            Layers = new List<Layer>();
        }

        public Layer AddLayer(string lname)
        {
            Layer newlayer = new Layer(lname);
            Layers.Add(newlayer);
            return newlayer;
        }

        public void RemovePolygon(Layer layer)
        {
            if (Layers.Contains(layer)) Layers.Remove(layer);
        }

        public IEnumerable<Layer> SortLayersByMaxPolySize()
        {
            return Layers.OrderByDescending(lyr => lyr.MaxPoly.Area);
        }
    }

    public class Layer
    {
        public string Name { get; }

        public List<Polygon> Polygons;

        public Layer(string lname)
        {
            Name = lname;
            Polygons = new List<Polygon>();
        }

        public Polygon MinPoly = null;
        public Polygon MaxPoly = null;

        public Polygon AddPolygon(Polygon poly)
        {
            Polygons.Add(poly);

            if (MinPoly == null)
            {
                MinPoly = poly;
                MaxPoly = poly;
            }
            else if (poly.Area < MinPoly.Area)
            {
                 MinPoly = poly;
            }
            else if (poly.Area > MaxPoly.Area)
            {
                 MaxPoly = poly;
            }

            return poly;
        }

        public void RemovePolygon(Polygon poly)
        {
            if(Polygons.Contains(poly)) Polygons.Remove(poly);
        }
    }

    // modify this to include relevant polygon data
    public class Polygon
    {
        public string Name { get; }

        public double Area { set; get; }

        public Polygon(string pname, double area = 0.0)
        {
            Name = pname;
            Area = area;
        }
    }
}

Usage example in some method:

LayerManager lmanager = new LayerManager("lman 1");

for (int i = 0; i < 5; i++)
{
    Layer newlayer = lmanager.AddLayer($"layer_{i}");

    for (int j = 0; j < 5; j++)
    {
        double area = i * 20 + j * 20;
        newlayer.AddPolygon(new Polygon($"poly_{i},{j}", area));
    }
}

double maxmax = lmanager.Layers.Max(lyr => lyr.MaxPoly.Area);
double minmin = lmanager.Layers.Min(lyr => lyr.MinPoly.Area);

List<Layer> lyrsbymax = lmanager.SortLayersByMaxPolySize().ToList();

Dave Kreskowiak · Answer 2 · 2021-11-22T02:08:00

Solution 1

There is no such thing. You cannot just throw a number on the end of a name and call it a variable.

What you should be looking into a any appropriate collection type, like and array or List, then you can use the index into that collection as your "number".

If you're writing that code 68 times, you're doing something very, very wrong.

Posted 22-Nov-21 2:08am

Dave Kreskowiak

Updated 22-Nov-21 2:18am

v2

Comments

dejf111 22-Nov-21 8:18am

It is a pity. Thanks.

Dave Kreskowiak 22-Nov-21 8:19am

Not a pity. It's how compiled languages work.

dejf111 23-Nov-21 4:54am

I don't write it 68 times it was an example omg

Dave Kreskowiak 23-Nov-21 10:34am

So what? Writing it more than once is a sign you've got a design problem.

dejf111 24-Nov-21 0:28am

It was just an example and a question of a possible solution, I solved it completely differently, so you can rest easy: D

Gerry Schmitz · Answer 3 · 2021-11-22T09:03:00

You're confusing the name (reference) of a variable with the ".Name" property of a control. If you want a unique "Name property" for each control, you can use: e.g.

newPolygon.Name = $"Poly{i:d2}";

If i = 5, the .Name then would be "Poly05".

Since the compiler doesn't know about them, they function (more or less) as "keys"; and not as identifiers that the compiler can recognize.

Automatic name according to the number of passes

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