public DatasetVector RasterToVector(Dataset sourceDataset, Datasource targetDatasource)
{
    //检查是否存在与结果数据集同名的数据集，如存在则删除
    string targetDatasetName = "resultVector";
    if (targetDatasource.Datasets.Contains(targetDatasetName))
    {
        targetDatasource.Datasets.Delete(targetDatasetName);
    }

    //实例化一个转换参数设置对象
    ConversionAnalystParameter conversionParameter = new ConversionAnalystParameter();

    conversionParameter.SourceDataset = sourceDataset;
    conversionParameter.TargetDatasource = targetDatasource;
    conversionParameter.TargetDatasetName = "resultVector";
    //设置转换类型为面状
    conversionParameter.TargetDatasetType = DatasetType.Region;
    //设置结果矢量数据集的值字段
    conversionParameter.ValueFieldName = "GridValue";

    //调用 ConvertToVector() 方法将栅格数据集转为矢量数据集，并获取结果矢量数据集
    DatasetVector resultDatasetVector = ConversionAnalyst.RasterToVector(conversionParameter);

    return resultDatasetVector;
}