C# AE 对图层筛选要素后显示/只显示符合条件的要素

[转载]地址：http://www.cnblogs.com/joysky/p/4581208.html  

有时候，我们要对图层上的地物进行有选择性的显示，以此来满足实际的功能要求。

按下面介绍的方法可轻松实现图层属性过滤显示：

  1、当图层已经加载时

private void ShowByFilter(AxMapControl sMapCtr, IFeatureLayer sFlyr, string sFilter)
        {
            ESRI.ArcGIS.Carto.IFeatureLayerDefinition pDef = (ESRI.ArcGIS.Carto.IFeatureLayerDefinition)sFlyr;
             pDef.DefinitionExpression = sFilter;
             sMapCtr.ActiveView.Refresh();
        }

说明：　sFilter 语句与SQL语句略有不同，使用时需要注意！

　

2、当图层尚未加载时

private IFeatureClass GetFeatureClass(IWorkspace pWS, string sTabName, string sAttrFilter)
        {
            try
            {
                if (pWS == null || sTabName == null) return null;
                IFeatureWorkspace pFWS = pWS as IFeatureWorkspace;
                IFeatureClass pFC = null;
                pFC = pFWS.OpenFeatureClass(sTabName);
                IQueryDef pQueryDef = pFWS.CreateQueryDef();
                pQueryDef.Tables = sTabName;
                pQueryDef.WhereClause = sAttrFilter;
                IQueryName2 pQueryName = new FeatureQueryNameClass();
                pQueryName.PrimaryKey = pFC.OIDFieldName;
                pQueryName.QueryDef = pQueryDef;
                IDataset pDS = (IDataset)pFWS;
                IWorkspaceName pWSName = (IWorkspaceName)pDS.FullName;
                IDatasetName pDSName = (IDatasetName)pQueryName;
                pDSName.WorkspaceName = pWSName;
                IName pName = (IName)pQueryName;
                pFC = pName.Open() as IFeatureClass;
                return pFC;
            }
            catch
            {
                return null;
            }
        }

 其他补充：

参照其他博客：

http://www.cnblogs.com/marvelousone/p/7466866.html