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

 1 public IFeature Find2(IPoint pPoint)
 2         {
 3             ITopologicalOperator pTopoOpe = pPoint as ITopologicalOperator;
 4             double dis = m_pMapControl.ActiveView.ScreenDisplay.DisplayTransformation.FromPoints(5);
 5             if (dis < 0.01)
 6                 dis = 0.01;
 7             IGeometry pBuffer = pTopoOpe.Buffer(dis);
 8             pBuffer.SpatialReference = m_pMapControl.Map.SpatialReference;
 9 
10             UIDClass id = new UIDClass();
11             id.Value = "{E156D7E5-22AF-11D3-9F99-00C04F6BC78E}";
12             IEnumLayer pEnumLayer = m_pMapControl.Map.get_Layers(id, true);
13             pEnumLayer.Reset();
14             IFeatureLayer pFLayer = pEnumLayer.Next() as IFeatureLayer;
15 
16             ISpatialFilter pSpatialFilter = new SpatialFilterClass();
17             pSpatialFilter.Geometry = pBuffer;
18             pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;
19             pSpatialFilter.WhereClause = "";
20 
21             while (pFLayer != null)
22             {
23                 if (pFLayer.Visible == false)
24                 {
25                     pFLayer = pEnumLayer.Next() as IFeatureLayer;
26                     continue;
27                 }
28                 IFeatureCursor pCursor = pFLayer.Search(pSpatialFilter, false);
29                 IFeature pFeat = pCursor.NextFeature();
30                 if (pFeat != null)
31                 {
32                     return pFeat;
33                 }
34                 System.Runtime.InteropServices.Marshal.ReleaseComObject(pCursor);
35                 pFLayer = pEnumLayer.Next() as IFeatureLayer;
36             }
37             return null;
38         }

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第二步：取出被选要素的属性值

 1 IFields pFields = pFeat.Fields;
 2             for (int i = 0; i < pFields.FieldCount; i++)
 3             {
 4                 IField pField = pFields.get_Field(i);
 5                 if (pField.Type != esriFieldType.esriFieldTypeBlob & pField.Type != esriFieldType.esriFieldTypeOID
 6                     & pField.Type != esriFieldType.esriFieldTypeGeometry)
 7                 {
 8                     checkedListBox1.Items.Add(pField.AliasName);
 9                 }
10             }

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

 1 ICallout pCallout = new ESRI.ArcGIS.Display.BalloonCalloutClass();
 2                         pCallout.AnchorPoint = pPoint;
 3                         pCallout.LeaderTolerance = 2;
 4 
 5                         ITextElement pTextElement = new TextElementClass();
 6                         IElement pElement = pTextElement as IElement;
 7                         ITextSymbol pTextSysmbol = pTextElement.Symbol;
 8                         IFormattedTextSymbol pFormattedTextSymbol = new TextSymbolClass();
 9                         pFormattedTextSymbol.Background = pCallout as ITextBackground;
10                         pFormattedTextSymbol.Size = 8;
11                         pFormattedTextSymbol.HorizontalAlignment = esriTextHorizontalAlignment.esriTHALeft;
12                         pTextElement.Symbol = pFormattedTextSymbol;
13                         pTextElement.Text = labelString;
14 
15                         pElement.Geometry = pPoint;
16                         m_pMapControl.ActiveView.GraphicsContainer.AddElement(pElement, 0);
17                         m_pMapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, m_pMapControl.Extent);

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