Mapcontrol 遍历所有图层方法

mapcontrol 遍历所有图层方法

2011-04-29 19:51

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。

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