ArcEngine中从多层次groupLayer中读取FeatureLayer

              在ArcEngine中，如果AxTocControl控件中的图层列表有3级或者3级以上的树结构，需要对某一个特定的FeatureLayer作操作的时候，这就需要从AxMapControl中查找到相应的FeatureLayer，针对这个问题，博主用递归的方法以FeatureLayer的name从AxMapControl中查找到该FeatureLayer，为了理清思路，用了两个方法实现，首先从AxMapControl开始，读取AxMapControl中的图层，如果为groupLayer，则通过getSubLayer方法继续递归直到得到FeatureLayer      

 public static IFeatureLayer getLayerFromName(AxMapControl mapControl, string layerName)
        {
            IFeatureLayer layer = null;
            for (int i = 0; i < mapControl.LayerCount; i++)
            {
                ILayer layers = mapControl.get_Layer(i);
                if (layers is GroupLayer || layers is ICompositeLayer)   //判断是否是groupLayer
                {
                    layer = getSubLayer(layers, layerName);  //递归的思想
                    if (layer != null)
                    {
                        break;
                    }
                }
                else
                {
                    if (mapControl.get_Layer(i).Name.Equals(layerName))
                    {
                        layer = layers as IFeatureLayer;
                        break;
                    }
                }
            }
            return layer;
        }

 

      //从groupLayer中查找FeatureLayer

        public static IFeatureLayer getSubLayer(ILayer layers, string layerName)       

        {
            IFeatureLayer l = null;
            ICompositeLayer compositeLayer = layers as ICompositeLayer;
            for (int i = 0; i < compositeLayer.Count; i++)
            {
                ILayer layer = compositeLayer.Layer[i];   //递归
                if (layer is GroupLayer || layer is ICompositeLayer)
                {
                    l = getSubLayer(layer, layerName);
                    if (l != null)
                    {
                        break;
                    }
                }
                else
                {
                    while (layer.Name.Equals(layerName))
                    {
                        l = layer as IFeatureLayer;
                        break;
                    }
                }
            }
            return l;
        }