ArcEngine合并线状要素的问题
要编码实现合并线状要素，在网上找了好多资料，大概都类似下面的代码，但是执行了之后都没什么效果，并没有合并，不知道为什么哦，请大神们给点意见吧！
//             Polyline pPolyline = null;
            ITopologicalOperator pTopologicalOperator;
            IFeature pFeatureTemp = pTypeArray[0] as IFeature;
            IGeometry pGeometry = pFeatureTemp.Shape;
            int jj = 1;
            while (jj < nFeatureCount)
            {
                pTopologicalOperator = pGeometry as ITopologicalOperator;
                pGeometry = ((IFeature)pTypeArray[jj]).Shape;
                pGeometry = pTopologicalOperator.Union(pGeometry as IGeometry);
                jj++;
            }
//             pPolyline = pGeometry as IPolyline;
------解决方案--------------------
以前做的项目，整个合并的函数如下

     

private void MergeFeatures(List<int> OneFeatureArr

{

            IFeatureLayer tFeatureLayer = tSelectLayer as IFeatureLayer;

            IFeatureClass pFeatureClass = tFeatureLayer.FeatureClass;

            var pDataset = pFeatureClass as IDataset;