ArcObjects features not in featuredataset

StacyMcNeil

I am trying to loop through layers in a map and return the name of the feature dataset.  I will then be performing some task on features in a specific feature dataset.  My map however is complex and includes some layers that do not reside in a feature dataset.  My code errors at this point.  I would like to somehow step over these layers without error.  The line If pFeatureLayer.DataSourceType = "SDE Feature Class" is an attempt to limit my results since all of those layers reside in a feature dataset but that doesn't seem to be working.  I am new to ArcObject so any help would be greatly appreciated!

Here is my code:

            Dim pMapDocument As IMapDocument = New MapDocument()
            If pMapDocument.IsMapDocument(destfile) Then
                pMapDocument.Open(destfile, Nothing)
                Dim pMap As IMap
                Dim i As Integer
                For i = 0 To pMapDocument.MapCount - 1 Step 1 + 1
                    pMap = pMapDocument.Map(i)
                    MsgBox(pMapDocument.DocumentFilename)
                    Dim pEnumLayer As IEnumLayer
                    Dim pID As New UID
                    Dim pFeatureClass As IFeatureClass
                    Dim pDataset As IDataset
                    Dim pFeatureLayer As IFeatureLayer2
                    pID.Value = "{6CA416B1-E160-11D2-9F4E-00C04F6BC78E}"
                    pEnumLayer = pMap.Layers(pID, True)
                    pEnumLayer.Reset()
                    pFeatureLayer = CType(pEnumLayer.Next, IFeatureLayer2)
                    Do Until pFeatureLayer Is Nothing
                        If pFeatureLayer.DataSourceType = "SDE Feature Class" Then
                            pFeatureClass = pFeatureLayer.FeatureClass
                            pDataset = pFeatureClass.FeatureDataset
                            MsgBox(pDataset.Name)
                        End If
                        pFeatureLayer = CType(pEnumLayer.Next, IFeatureLayer2)
                    Loop
                Next i
            End If
        Next

FreddieGibson

That portion of the code is about using Dictionaries. You can read up on this concept on the following page:

C# Dictionary

http://www.dotnetperls.com/dictionary

This is a data structure in .NET that is not related to ArcObjects. Think of it like an actual dictionary. In a dictionary a word (i.e. key) will be defined once and the definition (i.e. value) will consist of multiple words, which can be repeated. I used the name of the feature dataset as the key in the dictionary and used the names of the feature classes as the values so that I easily organize which feature classes were in which feature dataset and print out a "prettier" list of the results.  If you want you could simplify this logic as follows:

ILayer layer;


//    while ( (layer = enumLayer.Next()) != null)
//    {
//        var fc = (layer as IFeatureLayer).FeatureClass;


//        if (fc.FeatureDataset != null)
//        {
//            if (results.ContainsKey(fc.FeatureDataset.Name))
//                results[fc.FeatureDataset.Name].Add(fc.AliasName);
//            else
//                results[fc.FeatureDataset.Name] = new List<string> {fc.AliasName};
//        }
//        else
//            Console.WriteLine("Skipping {0}...NOT within a Feature Dataset", fc.AliasName);


//    }
//}


//foreach (var kvp in results)
//    Console.WriteLine("FEATURE DATASET: {0}\n...{1}\n", kvp.Key, String.Join("\n...", kvp.Value));


while ((layer = enumLayer.Next()) != null)
{
    var fc = (layer as IFeatureLayer).FeatureClass;


    if (fc.FeatureDataset != null)
        Console.WriteLine("FEATURE CLASS: {0,-20} | FEATURE DATASET: {1}", fc.AliasName, fc.FeatureDataset.Name);
}

Below are screenshots of the results of these two options.

** Option A : using dictionary **

** Option B **