public DatasetVector ExtractIsolineFromPoint3Ds(Datasource outputDatasource)
{
    Point3D[] arrayPoint3D = new Point3D[8];
    arrayPoint3D[0] = new Point3D(1, 1, 2);
    arrayPoint3D[1] = new Point3D(1, 2, 5);
    arrayPoint3D[2] = new Point3D(2, 2, 7);
    arrayPoint3D[3] = new Point3D(2, 4, 6);
    arrayPoint3D[4] = new Point3D(3, 1, 10);
    arrayPoint3D[5] = new Point3D(3, 3, 4);
    arrayPoint3D[6] = new Point3D(4, 1, 9);
    arrayPoint3D[7] = new Point3D(4, 3, 11);

    //构建一个三维点集合
    Point3Ds point3Ds = new Point3Ds();
    point3Ds.AddRange(arrayPoint3D);

    SurfaceExtractParameter surfaceExtractParameter = new SurfaceExtractParameter();
    surfaceExtractParameter.DatumValue = 1;
    surfaceExtractParameter.Interval = 3;
    surfaceExtractParameter.SmoothMethod = SmoothMethod.BSpline;
    surfaceExtractParameter.Smoothness = 5;

    //设置结果矢量数据集的名称，并检查数据源中是否已存在该数据集，如存在则删除
    String outputDatasetName = "extractIsoline";
    if (outputDatasource.Datasets.Contains(outputDatasetName))
    {
        outputDatasource.Datasets.Delete(outputDatasetName);
    }

    //从三维点集合提取等值线
    DatasetVector resultIsoline = SurfaceAnalyst.ExtractIsoline(surfaceExtractParameter, point3Ds, outputDatasource, outputDatasetName, 1, null);

    return resultIsoline;
}