C#: how to declare variable inside a Loop using a index. Pseudo Code ` For (int i...) {MapPolyline map+i = new MapPolyline(); .....}

Question

I have seen at stackexchange some answers with C++ but I need the answer at C#, please.

I must use a loop to add several MapPolylines to a map. If I don't declare a new one the last MapPolyLine is the only one that is shown.

for (int i = 0; i< collections.Count(); i++)
{

// PseudoCode (Locs is a LocationCollection)

MapPolyline mapl(+i) = new MapPolyline();
                        mapl(+i).Stroke = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Orange);
                        mapl(+i).StrokeThickness = 2;
                        mapl(+i).Opacity = 0.8;
                      
                        mapl(+i).Locations = locs;
                        mymap.Children.Add(mapl+i);

}

Thanks

Variable names must be known at compile time. If you want to map names at runtime, use a Map ("pun" intended) — knittl
– knittl, Commented Nov 2, 2022 at 18:48
Of course @knittl, I was thinking at code and not at compiler. Anyway you mentioned one thing I had never heard before ("There's an extra bit (pun intended) of compiler magic at work" as someone explains). Sorry, but my code was ok, but the order by of my sql was incorrect, My bad! — Luis Novais Reis
– Luis Novais Reis, Commented Nov 2, 2022 at 20:56

Dmitry Arestov · Accepted Answer · 2022-11-02 19:05:22Z

0

No need to use multiple variables mapl(+i). Just use one - mapl. Every iteration in the loop you will create a new object which you then add to some collection:

mymap.Children.Add(mapl);

So you will really have several of them. If you need to distinguish them by number, just add a field to the MapPolyline class, say, Id, and then just set it to i inside the loop:

mapl.Id = i;

answered Nov 2, 2022 at 19:05

Dmitry Arestov

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Luis Novais Reis Over a year ago

Thks @Dmitry Arestov, you are right and my code was right also. The issue was the "order by" of my sql. My bad, sorry. Anyway your idea of extending MapPolyLine to incorporate Id is very useful for the future. I was getting only one mappolyline and I thought BingMaps was overriding it at each iteration. Lesson learnt.

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