ArcEngine 中使用 ISpatialFilter 查询SQL Sever 中的矢量查不到要素是什么原因？

ArcEngine 中使用 ISpatialFilter 查询SQL Sever 中的矢量查不到要素，执行到 featureCursor.NextFeature()直接返回，是什么原因？
代码：

IFields fields = pFeatureLayer.FeatureClass.Fields;

 ISpatialFilter spatialFilter = new SpatialFilterClass();

 spatialFilter.Geometry = pBufferGeometry;

 spatialFilter.GeometryField = pFeatureLayer.FeatureClass.ShapeFieldName;

 spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;

 IFeatureCursor featureCursor = pFeatureLayer.Search(spatialFilter, false);

 IFeature feature = featureCursor.NextFeature();//执行到这句直接返回

 while (feature != null) {

     System.Data.DataRow newRow = pDataTableStructure.NewRow();

     // ...



     feature = featureCursor.NextFeature();

 }

 //释放COM对象。

 System.Runtime.InteropServices.Marshal.ReleaseComObject(featureCursor);

错误提示：