Discussion Forums

If you have shapefiles loaded and you use Map.Layers.Clear(); and then try to reload the same shapefile you get an error.

To overcome this I had to use

for(int i=0;i

Map.Layers.Remove(Map.Layers[i]);

 

Also, Map.Layers.RemoveAt[i] did not work.

 

of course there was a bug in that code the real code would look like:

 

int counter=Map.Layers.Count;

for(int i=0;i

Map.Layers.Remove(Map.Layers[0]);

 

 

 

 

We tested the functions Layers.Clear and Layers.RemoveAt() as you described but we did not find any problem. We would need more information on how you are using those functions. Thank you.

Assuming you have a Form with a Map control containing no layers setup to display on the form.....

 

This does not work(Clear()):

            Layer l = new Layer(@"\My Documents\shps\Test.shp");
            mapdisplay.Layers.Add(l);
            mapdisplay.Layers.Clear();
            Layer l2 = new Layer(@"\My Documents\shps\Test.shp");
            mapdisplay.Layers.Add(l2);

 

This does not work(RemoveAt()):

           Layer l = new Layer(@"\My Documents\shps\Test.shp");
            mapdisplay.Layers.Add(l);
            mapdisplay.Layers.RemoveAt(0);
            Layer l2 = new Layer(@"\My Documents\shps\Test.shp");
            mapdisplay.Layers.Add(l2);

 

This does work(Remove()):

            Layer l = new Layer(@"\My Documents\shps\Test.shp");
            mapdisplay.Layers.Add(l);
            mapdisplay.Layers.Remove(mapdisplay.Layers[0]);
            Layer l2 = new Layer(@"\My Documents\shps\Test.shp");
            mapdisplay.Layers.Add(l2);

 

For the code that does not work, I get an Argument Exception: "Value does not fall within the expected range" .

 

I hope this is helpful.

Thanks again.

 

 

Timothy,

The reason these functions are not working is due to a lack of a defined MapUnit. Please added the following line of code to your app:

map1.MapUnit = MapLengthUnits.DecimalDegrees;

ThinkGeo Support