/// <summary>
/// 多边形转点，将多边形要素类每个图斑的中心（重心）点存入新的点要素类中
/// </summary>
/// <param name="sourceClass"></param>
/// <param name="targeClassPath"></param>
/// <returns></returns>
public static IFeatureClass PolygonClassToPoint(this IFeatureClass sourceClass, string targeClassPath)
{
if (sourceClass.ShapeType != esriGeometryType.esriGeometryPolygon)
{
throw new Exception($"{sourceClass}不是面图层！");
}
var outClass = sourceClass.CopyStruct(targeClassPath, esriGeometryType.esriGeometryPoint);
var outFeatureCursor = outClass.Insert(true);
var outFeatureBuffer = outClass.CreateFeatureBuffer();
sourceClass.QueryFeatures(null, feature =>
{
var shape = feature.Shape;
if (shape == null || shape.IsEmpty)
{
throw new Exception($"{sourceClass}图层中存在几何为空的记录，请先进行修复几何！");
}
var dict = GetFieldIndexFromTwoClass(sourceClass, outClass, true);//其他字段值都从原图层复制过来
foreach (var pair in dict)
{
outFeatureBuffer.set_Value(pair.Value, feature.get_Value(pair.Key));
}
outFeatureBuffer.Shape = (shape as IPolygon).GetPolygonCenter();//获取多边形的中心点
outFeatureCursor.InsertFeature(outFeatureBuffer);
}, true);
outFeatureCursor.Flush();
Marshal.ReleaseComObject(sourceClass);
Marshal.ReleaseComObject(outFeatureBuffer);
Marshal.ReleaseComObject(outFeatureCursor);
Marshal.ReleaseComObject(outClass);
return(outClass);
}