遍历MapControl中的图层方法总结

通过IMap中的get_layers()可以遍历MapControl中当前的图层。此方法可以通过指定UID对图层进行过滤或者分类。

1. 遍历矢量图层

public IEnumLayer GetFeatureLayers()
        {
            UID uid = new UIDClass();
            uid.Value = "{40A9E885-5533-11d0-98BE-00805F7CED21}";//FeatureLayer
            IEnumLayer layers = frmMap.m_mapCtrl.Map.get_Layers(uid, true);
            return layers;
        }

2. 遍历栅格图层

public IEnumLayer GetRasterLayers()
        {
            UID uid = new UIDClass();
            uid.Value = "{D02371C7-35F7-11D2-B1F2-00C04F8EDEFF}";//RasterLayer
            IEnumLayer layers = frmMap.m_mapCtrl.Map.get_Layers(uid, true);
            return layers;
        }

3.遍历其它图层

只要修改相应的UID即可。常见的数据类型的UID有：

{6CA416B1-E160-11D2-9F4E-00C04F6BC78E} IDataLayer （包括所有类型的图层）
{40A9E885-5533-11d0-98BE-00805F7CED21} IFeatureLayer
{E156D7E5-22AF-11D3-9F99-00C04F6BC78E} IGeoFeatureLayer
{34B2EF81-F4AC-11D1-A245-080009B6F22B} IGraphicsLayer
{5CEAE408-4C0A-437F-9DB3-054D83919850} IFDOGraphicsLayer
{0C22A4C7-DAFD-11D2-9F46-00C04F6BC78E} ICoverageAnnotationLayer
{EDAD6644-1810-11D1-86AE-0000F8751720} IGroupLayer

4. 通过图层名获取图层接口

在AE开发中，这是常用到的功能，配合上面的方法，很容易实现。

//获取矢量图层接口
public IFeatureLayer GetFeatureLayer(string layerName)
        {
            //get the layers from the maps
            IEnumLayer layers = GetFeatureLayers();
            layers.Reset();
            ILayer layer = null;
            while ((layer = layers.Next()) != null)
            {
                if (layer.Name == layerName)
                    return layer as IFeatureLayer;
            }
            return null;
        }

//获取栅格图层接口
public IRasterLayer GetRasterLayer(string layerName)
        {
            //get the layers from the maps
            IEnumLayer layers = GetRasterLayers();
            layers.Reset();
            ILayer layer = null;
            while ((layer = layers.Next()) != null)
            {
                if (layer.Name == layerName)
                    return layer as IRasterLayer;
            }
            return null;
        }

获取其它类型的图层接口，同此类似。本篇文章来源于 3SDN 转载请以链接形式注明出处网址：http://www.3sdn.net/gis2dev/ae/2009-08-29/454.html