topic Re: Need a piece of code to check FeatureLayer and more ... in ArcObjects SDK Questions

Need a piece of code to check FeatureLayer and more ...

ShaningYu — Fri, 20 Oct 2017 18:16:23 GMT

I need a piece of code to check if a layer in ArcMap is a FeautureLayer.

                IMap pMap = m_mxDoc.FocusMap;
                for (int i = 0; i < m_mxDoc.Maps.Count; i++) {
                    ILayer pLayer = pMap.Layer;
                    //if (typeof(pMap.Layer) is IFeatureLayer )   ??? How to code here?

Appreciate if you can help.

Re: Need a piece of code to check FeatureLayer and more ...

DuncanHornby — Sat, 11 Dec 2021 10:53:38 GMT

Here is some code in VBA that shows you how to test if object is of type IFeatureLayer

Public Sub test()
 Dim pMxDoc As IMxDocument
 Set pMxDoc = ThisDocument
 Dim pMap As IMap
 Set pMap = pMxDoc.FocusMap
 Dim pEnumLayers As IEnumLayer
 Set pEnumLayers = pMap.Layers
 Dim pLayer As ILayer
 Set pLayer = pEnumLayers.Next
 Do While Not (pLayer Is Nothing)
 If TypeOf pLayer Is IFeatureLayer Then
 Debug.Print "FeatureLayer found!"
 End If
 Set pLayer = pEnumLayers.Next
 Loop
End Sub‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Need a piece of code to check FeatureLayer and more ...

AllanMills — Sun, 22 Oct 2017 23:41:57 GMT

You'd be better of enumerating the layers to only get feature layers. For the above code, when you convert it to a .NET equivalent you can provide an ID to the layers command:

Dim pId As New UID
pId.Value = "{40A9E885-5533-11d0-98BE-00805F7CED21}"
Dim pEnumLayers As IEnumLayer = pMap.Layers(pId, True)

The pId value tells Arc what kind of layers to look for. This page: ArcObjects Help for .NET developers tells you the GUID values for different data types.

Re: Need a piece of code to check FeatureLayer and more ...

ShaningYu — Tue, 31 Oct 2017 18:00:17 GMT

Revised the code as:

if (m_Map.Layer is IFeatureLayer) { ... }

No need to use typeof(...) Thanks.