[mapguide-users] Remove layer C#

[Jackie Ng]

Remove() is expecting a MgLayerBase object, you are passing in a string.
Hence the compilation error.

Maybe try something like this instead:

MgMap map = new MgMap(siteConnection);
map.Open(mgMapName);
	
MgLayerCollection layerCol = map.GetLayers();
string layerName = "myLayer";

MgLayer layerToRemove = null;
foreach(MgLayer layer in layerCol)
{
      if(layer.Name == layerName)
      {
            layerToRemove = layer;
            break;
      }
}

if(layerToRemove != null)
{
      layerCol.Remove(layerToRemove);
}


- Jackie.


Alex Fordyce wrote:
> 
> I'm to see if a layer exists and remove it if it exists. The layer would
> have been saved as a temporary resource. Here is the code.  
> 
> // get the map
> MgMap map = new MgMap(siteConnection);
> map.Open(mgMapName);
> 	
> MgLayerCollection layerCol = map.GetLayers();
> 	
> if(layerCol.Contains("myLayer"))
> {
>      layerCol.Remove("myLayer");
> }
> 	
> .... Add myLayer code here .....
> 
> I get the following error whether or not the layer exists:
> 
>  Compiler Error Message: CS1502: The best overloaded method match for
> 'OSGeo.MapGuide.MgLayerCollection.Remove(OSGeo.MapGuide.MgLayerBase)' has
> some invalid arguments
> 
> Source Error:
> 
> Line 42: 	if(layerCol.Contains("myLayer"))
> Line 43: 	{
> Line 44: 		layerCol.Remove("myLayer");
> Line 45: 	}
> Line 46: 	
> 
> Anyone have any suggestions?
> 
> Thanks in advance.
> 
> alex
> 

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