IFeatureLayer pFeatureLayer;

 pFeatureLayer = axMapControl1.Map.get_Layer(0) as IFeatureLayer;

//把pFeatureLayer 賦值為當前圖層；

for (int i = 0; i != axMapControl1.Map.LayerCount; ++i)
            {
                pFeatureLayer = axMapControl1.Map.get_Layer(i) as IFeatureLayer;
                if (pFeatureLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPoint)
                    {

                         //為點圖層         

                     }

}