标准树中各图层要素的个数统计

private void _muiStaticFeature_Click(object sender, EventArgs e)
  {
   TreeNode tNode = this._tevCatalog.SelectedNode;
   TreeNode tChildNode = new TreeNode();
   ESRI.ArcGIS.Geodatabase.IFeature     pFeature;
   ESRI.ArcGIS.Geodatabase.IFeatureClass   pFeatureClass;
   ESRI.ArcGIS.Geodatabase.IFeatureCursor  pCursor;
   ESRI.ArcGIS.Carto.IFeatureLayer         pFeatureLayer;
   ESRI.ArcGIS.Geodatabase.IQueryFilter pQuery = new QueryFilterClass();
   YJDSoft.Maps.MapManager.Forms.FeatureCalculate frmFeatureCalculate = new YJDSoft.Maps.MapManager.Forms.FeatureCalculate();
            this.iPointCalculate   = 0;
   this.iLineCalculate    = 0;
   this.iPolygonCalculate = 0;

   //当所选节点为叶子节点时的要素个数统计
   if(tNode!=null && tNode.FirstNode == null)
   {
    //获取图层信息，放到变量layerinfo中
    if (layerinfo!=null)
    {
     
     pFeatureLayer = layerinfo.Layer as IFeatureLayer;
     pFeatureClass = pFeatureLayer.FeatureClass;  
     try
     {
      pCursor  = pFeatureClass.Search(pQuery,false);
      pFeature = pCursor.NextFeature(); 
     }
     catch(Exception err)
     {
      MessageBox.Show(err.Message,"错误提示", MessageBoxButtons.OK,MessageBoxIcon.Error);
      return;
     }
     if(pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPoint)
     {
      frmFeatureCalculate.iPointCount = pFeatureLayer.FeatureClass.FeatureCount(pQuery);
     }
     if (pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolyline||pFeature.Shape.GeometryType == esriGeometryType.esriGeometryLine)
     {
      frmFeatureCalculate.iLineCount = pFeatureLayer.FeatureClass.FeatureCount(pQuery);
     }
     if(pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolygon)
     {
      frmFeatureCalculate.iPolygonCount= pFeatureLayer.FeatureClass.FeatureCount(pQuery);
     }
    }
   }
   //当所选节点有子节点时的要素个数统计
      
   if(tNode!=null && tNode.FirstNode!=null)
   {           
    
         this.calculateFeature(tNode);
        frmFeatureCalculate.iPointCount      = this.iPointCalculate;
       frmFeatureCalculate.iLineCount       = this.iLineCalculate;
       frmFeatureCalculate.iPolygonCount    = this.iPolygonCalculate;
   }
      frmFeatureCalculate.Show();
  }

 //遍历所选节点的所有子节点，并且计算要素的个数
  public void calculateFeature(TreeNode SelectedNode)
  {           
   ESRI.ArcGIS.Geodatabase.IFeature pFeature;
   ESRI.ArcGIS.Geodatabase.IFeatureClass   pFeatureClass;
   ESRI.ArcGIS.Geodatabase.IFeatureCursor  pCursor;
   ESRI.ArcGIS.Carto.IFeatureLayer         pFeatureLayer;
   ESRI.ArcGIS.Geodatabase.IQueryFilter pQuery = new QueryFilterClass();
   if(SelectedNode!=null && SelectedNode.FirstNode!=null )
   {
    
    
    foreach(TreeNode tn in SelectedNode.Nodes)
    {
//获取图层信息，放到变量layerinfo中

     if (layerinfo!=null)
     {
                    
      pFeatureLayer = layerinfo.Layer as IFeatureLayer;
      pFeatureClass = pFeatureLayer.FeatureClass;  
      try
      {
       pCursor  = pFeatureClass.Search(pQuery,false);
       pFeature = pCursor.NextFeature(); 
      }
      catch(Exception err)
      {
       MessageBox.Show(err.Message,"错误提示", MessageBoxButtons.OK,MessageBoxIcon.Error);
       return;
      }
      if(pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPoint)
      {
       this.iPointCalculate += pFeatureLayer.FeatureClass.FeatureCount(pQuery);
      }
      if (pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolyline||pFeature.Shape.GeometryType == esriGeometryType.esriGeometryLine)
      {
       this.iLineCalculate += pFeatureLayer.FeatureClass.FeatureCount(pQuery);
      }
      if(pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolygon)
      {
       this.iPolygonCalculate += pFeatureLayer.FeatureClass.FeatureCount(pQuery);
      }
     }
     this.calculateFeature(tn);
    }
    
    
   }
  }