Method to get IFeatureClass

RyanHawkins

I am trying to create a method where I am able to select a specific layer and return the IFeatureClass of that layer. I used a return type double and it returns the correct value: 50. I would normally have return featureclass; but I am using the double to test the logic. I am unsure of when I would normally return 0, how I return an IFeatureClass. I am going to use this method to select two different featureclasses for spatial queries. Any suggestions from how to solve this problem to critiques on my coding techniques will be greatly appreciated! Below is the code I currently have:

public double GetFeatureLayer(string layerName)
{
try
{
IMap map = ArcMap.Document.FocusMap;

//Bail if map has no layers.
if (map.LayerCount == 0)
{
MessageBox.Show("There are no layers importerd. Please add Layers and try again");
return 0;
}

//Fetch all the feauture layers in the focus map
//to determine if at least one is selectable
IUID uid = new UIDClass();
uid.Value = "{40A9E885-5533-11D0-98BE-00805F7CED21}";
IEnumLayer enumLayer = map.get_Layers((UID)uid, true);
enumLayer.Reset();
IFeatureLayer featureLayer = (IFeatureLayer)enumLayer.Next();

while (featureLayer != null)
{
if (featureLayer.Name.ToString() == "Structure")
{
IFeatureClass featureClass = featureLayer.FeatureClass;
return 50;
}

else
{
featureLayer = (IFeatureLayer)enumLayer.Next();
}
}
return 0;
}
catch (Exception ex)
{
MessageBox.Show(ex.StackTrace);
return 0;
}
}

RyanHawkins

No worries! I think I figured it out. It might not be the most efficient coding but here is what I came up with!

        public IFeatureLayer GetFeatureLayer(string layerName)
        {
            try
            {
                IMap map = ArcMap.Document.FocusMap;

                //Bail if map has no layers.
                if (map.LayerCount == 0)
                {
                    MessageBox.Show("There are no layers importerd. Please add Layers and try again");
                    IFeatureLayer layer = null;
                    return layer;
                }

                //Fetch all the feauture layers in the focus map
                //to determine if at least one is selectable
                IUID uid = new UIDClass();
                uid.Value = "{40A9E885-5533-11D0-98BE-00805F7CED21}";
                IEnumLayer enumLayer = map.get_Layers((UID)uid, true);
                enumLayer.Reset();
                IFeatureLayer featureLayer = (IFeatureLayer)enumLayer.Next();

                while (featureLayer != null)
                {
                    if (featureLayer.Name.ToString() == layerName)
                    {
                        return featureLayer;
                    }

                    else
                    {
                        featureLayer = (IFeatureLayer)enumLayer.Next();
                    }
                }
                IFeatureLayer layer2 = null;
                return layer2;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.StackTrace);
                IFeatureLayer layer = null;
                return layer;
            }
        }