AE实现点击一个要素，并显示其属性

第一步：根据鼠标点击处的点，找到被选中的要素

 public IFeature Find2(IPoint pPoint)
         {
             ITopologicalOperator pTopoOpe = pPoint as ITopologicalOperator;
             double dis = m_pMapControl.ActiveView.ScreenDisplay.DisplayTransformation.FromPoints();
             if (dis < 0.01)
                 dis = 0.01;
             IGeometry pBuffer = pTopoOpe.Buffer(dis);
             pBuffer.SpatialReference = m_pMapControl.Map.SpatialReference;

             UIDClass id = new UIDClass();
             id.Value = "{E156D7E5-22AF-11D3-9F99-00C04F6BC78E}";
             IEnumLayer pEnumLayer = m_pMapControl.Map.get_Layers(id, true);
             pEnumLayer.Reset();
             IFeatureLayer pFLayer = pEnumLayer.Next() as IFeatureLayer;

             ISpatialFilter pSpatialFilter = new SpatialFilterClass();
             pSpatialFilter.Geometry = pBuffer;
             pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;
             pSpatialFilter.WhereClause = "";

             while (pFLayer != null)
             {
                 if (pFLayer.Visible == false)
                 {
                     pFLayer = pEnumLayer.Next() as IFeatureLayer;
                     continue;
                 }
                 IFeatureCursor pCursor = pFLayer.Search(pSpatialFilter, false);
                 IFeature pFeat = pCursor.NextFeature();
                 if (pFeat != null)
                 {
                     return pFeat;
                 }
                 System.Runtime.InteropServices.Marshal.ReleaseComObject(pCursor);
                 pFLayer = pEnumLayer.Next() as IFeatureLayer;
             }
             return null;
         }

第二步：取出被选要素的属性值

 IFields pFields = pFeat.Fields;
             for (int i = ; i < pFields.FieldCount; i++)
             {
                 IField pField = pFields.get_Field(i);
                 if (pField.Type != esriFieldType.esriFieldTypeBlob & pField.Type != esriFieldType.esriFieldTypeOID
                     & pField.Type != esriFieldType.esriFieldTypeGeometry)
                 {
                     checkedListBox1.Items.Add(pField.AliasName);
                 }
             }

第三步：在mapcontrol中显示属性，用到ICallout 加ITextElement

 ICallout pCallout = new ESRI.ArcGIS.Display.BalloonCalloutClass();
                         pCallout.AnchorPoint = pPoint;
                         pCallout.LeaderTolerance = ;

                         ITextElement pTextElement = new TextElementClass();
                         IElement pElement = pTextElement as IElement;
                         ITextSymbol pTextSysmbol = pTextElement.Symbol;
                         IFormattedTextSymbol pFormattedTextSymbol = new TextSymbolClass();
                         pFormattedTextSymbol.Background = pCallout as ITextBackground;
                         pFormattedTextSymbol.Size = ;
                         pFormattedTextSymbol.HorizontalAlignment = esriTextHorizontalAlignment.esriTHALeft;
                         pTextElement.Symbol = pFormattedTextSymbol;
                         pTextElement.Text = labelString;

                         pElement.Geometry = pPoint;
                         m_pMapControl.ActiveView.GraphicsContainer.AddElement(pElement, );
                         m_pMapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, m_pMapControl.Extent);