转自：

ArcGIS的转换工具（ConversionTools）提供了将图层输出到kml的接口LayerToKML，

这个方法被封装在ESRI.ArcGIS.ConversionTools中

    LayerToKML接口的输入参数layer接收两种类型的参数：本地磁盘的图层文件(*.lyr)、内存中的图层。

n  将本地磁盘图层文件（*.lyr）输出kml

// LayerToKML接口输出kml

Geoprocessor pGeoProcessor = new Geoprocessor();

   ESRI.ArcGIS.ConversionTools.LayerToKML pLayerToKML = new ESRI.ArcGIS.ConversionTools.LayerToKML();

   pLayerToKML.layer = @"D:\slayer.lyr";

   pLayerToKML.out_kmz_file = "C:\\pkm.kmz";

   pLayerToKML.layer_output_scale = 10000.0;

   pGeoProcessor.OverwriteOutput = true;

   IGeoProcessorResult resultGeo =

           (IGeoProcessorResult)pGeoProcessor.Execute(pLayerToKML, null);

   if (resultGeo.Status == esriJobStatus.esriJobSucceeded)

                    MessageBox.Show("执行成功！", "输出KML", MessageBoxButtons.OK, MessageBoxIcon.Information);

   else

                    MessageBox.Show("执行Error！", "输出KML", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);

n  将图层选择集输出kml

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

//设置空间查询范围条件

ISpatialFilter pQueryFilter = new SpatialFilterClass();

pQueryFilter.Geometry = pPoly;

pQueryFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;

//生成图层在此范围内的选择

IFeatureSelection pFeatureSele = pFeatureLayer as IFeatureSelection;

pFeatureSele.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultNew, false);

//IFeatureLayerDefinition接口 在当前将图层选择集 基础上创建新的图层

IFeatureLayerDefinition2 pFLayerDef = pFeatureLayer as IFeatureLayerDefinition2;

IFeatureLayer pNewLyr = pFLayerDef.CreateSelectionLayer("uuu", true, null, null);

// LayerToKML接口输出kml

ESRI.ArcGIS.Geoprocessor.Geoprocessor pGeoProcessor = new ESRI.ArcGIS.Geoprocessor.Geoprocessor();

     ESRI.ArcGIS.ConversionTools.LayerToKML pLayerToKML = new ESRI.ArcGIS.ConversionTools.LayerToKML();

     pLayerToKML.layer = pNewLyr;

     pLayerToKML.out_kmz_file ="C:\\NewKML.kmz" ;

     pLayerToKML.layer_output_scale = 10000.0;

     pGeoProcessor.OverwriteOutput = true;

     IGeoProcessorResult resultGeo =

                    (IGeoProcessorResult)pGeoProcessor.Execute(pLayerToKML, null);

     if (resultGeo.Status == esriJobStatus.esriJobSucceeded)

                    MessageBox.Show("执行成功！", "输出KML", MessageBoxButtons.OK, MessageBoxIcon.Information);

     else

                    MessageBox.Show("执行Error！", "输出KML", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);