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ArcGIS Engine -- 常用方法

 
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空间关系

计算两点间距离
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1         /// <summary>计算两点间距离
2 /// </summary>
3 /// <param name="point1"></param>
4 /// <param name="point2"></param>
5 /// <returns></returns>
6         public static double getDistanceOfTwoPoints(ESRI.ArcGIS.Geometry.IPoint point1, ESRI.ArcGIS.Geometry.IPoint point2)
7         {
8             return Math.Sqrt((point1.X - point2.X) * (point1.X - point2.X) + (point1.Y - point2.Y) * (point1.Y - point2.Y));
9         }
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feature平移 
1 IGeometry geo＝feature.Shape;
2 ((ITransform2D)geo).Move(20,20);


计算范围

得到点集合的n倍Envelope范围
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 1         /// <summary>得到点集合的n倍Envelope范围
 2 /// </summary>
 3 /// <param name="points"></param>
 4 /// <param name="zoomInNumber"></param>
 5 /// <returns></returns>
 6         public static IEnvelope getBigEnvelope(IPointCollection points, double zoomInNumber)
 7         {
 8             IEnvelope result = new EnvelopeClass();
 9 
10             double xmax = 0, xmin = 999999999999, ymax = 0, ymin = 999999999999;
11 
12             for (int i = 0; i < points.PointCount; i++)
13             {
14                 ESRI.ArcGIS.Geometry.IPoint p = points.get_Point(i);
15                 if (xmax < p.X) xmax = p.X;
16                 if (ymax < p.Y) ymax = p.Y;
17                 if (xmin > p.X) xmin = p.X;
18                 if (ymin > p.Y) ymin = p.Y;
19             }
20             result.XMax = xmax + xmax - xmin;
21             result.XMin = xmin - xmax + xmin;
22             result.YMax = ymax + ymax - ymin;
23             result.YMin = ymin - ymax + ymin;
24 
25             return result;
26         }
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查询

查询要素，返回多个要素union后的Geometry
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 1         /// <summary>查询要素
 2 /// 多个要素取其union后的范围
 3 /// </summary>
 4 /// <param name="map">地图</param>
 5 /// <param name="layer">矢量图层</param>
 6 /// <param name="where">查询条件</param>
 7 /// <returns></returns>
 8         public static IGeometry queryUnionGeometry(IMap map, IFeatureLayer layer, string where)
 9         {
10             if (layer == null) return null;
11 
12             IFeatureClass featCls = layer.FeatureClass;
13 
14             IQueryFilter filter = new QueryFilterClass();
15             filter.WhereClause = where;
16             IFeatureCursor cursor = featCls.Search(filter, false);
17 
18             IFeature feature = cursor.NextFeature();
19             if (feature == null) return null;
20 
21             Boolean isFirstFeature = true;
22             IGeometry union = null;
23             while (feature != null)
24             {
25                 if (isFirstFeature)
26                 {
27                     isFirstFeature = false;
28                     union = feature.Shape;
29                 }
30                 else
31                 {
32                     union=((ITopologicalOperator)union).Union(feature.Shape);
33                 }
34                 feature = cursor.NextFeature();
35             }
36 
37             return union; ;
38         }
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查找图层

得到地图上图层列表
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 1         /// <summary>得到地图上图层列表
 2 /// </summary>
 3 /// <param name="map"></param>
 4 /// <returns></returns>
 5         public static IEnumLayer getFeatureLayers(IMap map)
 6         {
 7             UID uid = new UIDClass();
 8 
 9             //{6CA416B1-E160-11D2-9F4E-00C04F6BC78E} IDataLayer （all）
10 //{40A9E885-5533-11d0-98BE-00805F7CED21} IFeatureLayer
11 //{E156D7E5-22AF-11D3-9F99-00C04F6BC78E} IGeoFeatureLayer
12 //{34B2EF81-F4AC-11D1-A245-080009B6F22B} IGraphicsLayer
13 //{5CEAE408-4C0A-437F-9DB3-054D83919850} IFDOGraphicsLayer
14 //{0C22A4C7-DAFD-11D2-9F46-00C04F6BC78E} ICoverageAnnotationLayer
15 //{EDAD6644-1810-11D1-86AE-0000F8751720} IGroupLayer
16             uid.Value = "{40A9E885-5533-11d0-98BE-00805F7CED21}";//FeatureLayer
17             IEnumLayer layers = map.get_Layers(uid, true);
18             return layers;
19         }
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根据名称在地图上查找对应矢量图层
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 1         /// <summary>根据名称在地图上查找对应矢量图层
 2 /// </summary>
 3 /// <param name="map"></param>
 4 /// <param name="layerName"></param>
 5 /// <returns></returns>
 6         public static IFeatureLayer getFeatureLayer(IMap map,string layerName)
 7         {
 8             IEnumLayer layers = getFeatureLayers(map);
 9             layers.Reset();
10             ILayer layer = null;
11             while ((layer = layers.Next()) != null)
12             {
13                 if (layer.Name == layerName)
14                     return layer as IFeatureLayer;
15             }
16             return null;
17         }
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选择要素集

得到指定图层上的选中的要素集
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 1         /// <summary>得到指定图层上的选中的features
 2 /// </summary>
 3 /// <param name="map">地图</param>
 4 /// <param name="layerName">图层名</param>
 5 /// <returns>IFeatureCursor</returns>
 6         public static IFeatureCursor getSelectFeatures(IMap map, string layerName)
 7         {
 8             IFeatureLayer featureLayer = Util.getFeatureLayer(map, layerName); ;
 9 
10             //得到选中的feature
11             IFeatureClass inputFeatureClass = featureLayer.FeatureClass;
12             IDataset inputDataset = (IDataset)inputFeatureClass;
13             IDatasetName inputDatasetName = (IDatasetName)inputDataset.FullName;
14             IFeatureSelection featureSelection = (IFeatureSelection)featureLayer;
15             ISelectionSet selectionSet = featureSelection.SelectionSet;
16 
17             ICursor cursor;
18             selectionSet.Search(null, false, out cursor);
19             IFeatureCursor featureCursor = (IFeatureCursor)cursor;
20 
21             return featureCursor;
22         }
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加载数据

将GDB中数据添加至地图
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 1         /// <summary>将GDB中数据添加至地图
 2 /// </summary>
 3 /// <param name="map">地图IMap</param>
 4 /// <param name="gdbPath">GDB路径</param>
 5 /// <param name="name">数据名称</param>
 6         public static void addFeatLayerToMapFromGDB(IMap map,string gdbPath,string name)
 7         {
 8             IWorkspaceFactory toWsf = new FileGDBWorkspaceFactoryClass();
 9             IFeatureWorkspace toFeatWs = (IFeatureWorkspace)toWsf.OpenFromFile(gdbPath, 0);
10             IFeatureClass featCls = toFeatWs.OpenFeatureClass(name);
11             ILayer layer=new FeatureLayerClass();
12             layer.Name = name;
13             ((IGeoFeatureLayer)layer).FeatureClass=featCls;
14             if (featCls != null) {
15                 map.AddLayer(layer);
16             }
17         }
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加载dwg中的polygon图层

新建shapefile文件/GDB

创建点shapefile
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 1         /// <summary>创建点shapefile
 2 /// </summary>
 3 /// <param name="filePath">target point shapefile path</param>
 4 /// <param name="fileName">target point shapefile name</param>
 5         public static void createPointShapefile(IMap map, string filePath, string fileName)
 6         {
 7             //建立shape字段
 8             IFields pFields = new FieldsClass();
 9             IFieldsEdit pFieldsEdit = pFields as IFieldsEdit;
10             IField pField = new FieldClass();
11             IFieldEdit pFieldEdit = pField as IFieldEdit;
12             pFieldEdit.Name_2 = "Shape";
13             pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
14 
15             //设置geometry definition
16             IGeometryDef pGeometryDef = new GeometryDefClass();
17             IGeometryDefEdit pGeometryDefEdit = pGeometryDef as IGeometryDefEdit;
18             pGeometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;//点、线、面
19             pGeometryDefEdit.SpatialReference_2 = map.SpatialReference;
20             pFieldEdit.GeometryDef_2 = pGeometryDef;
21             pFieldsEdit.AddField(pField);
22 
23             //新建字段
24             pField = new FieldClass();
25             pFieldEdit = pField as IFieldEdit;
26             pFieldEdit.Length_2 = 10;
27             pFieldEdit.Name_2 = "id";
28             pFieldEdit.AliasName_2 = "id";
29             pFieldEdit.Type_2 = esriFieldType.esriFieldTypeSmallInteger;
30             pFieldsEdit.AddField(pField);
31             //继续增加其它字段
32 
33             IWorkspaceFactory pWorkspaceFactory = new ShapefileWorkspaceFactory();
34             IFeatureWorkspace pFeatureWorkspace = pWorkspaceFactory.OpenFromFile(filePath, 0) as IFeatureWorkspace;
35 
36             //IWorkspaceFactory pWorkspaceFactory = new FileGDBWorkspaceFactoryClass();
37 //IFeatureWorkspace pFeatureWorkspace = pWorkspaceFactory.OpenFromFile(filePath, 0) as IFeatureWorkspace;
38 
39             int i = fileName.IndexOf(".shp");
40             if (i == -1)
41                 pFeatureWorkspace.CreateFeatureClass(fileName + ".shp", pFields, null, null, esriFeatureType.esriFTSimple, "Shape", "");
42             else
43                 pFeatureWorkspace.CreateFeatureClass(fileName, pFields, null, null, esriFeatureType.esriFTSimple, "Shape", "");
44 
45             //MessageBox.Show("OK");
46 
47         }
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将选中要素另存至GDB

　　另存为shapefile类似，修改workspacefactory为ShapefileWorkspaceFactoryClass，修改对应路径即可。

将选中的line feature作为线文件存至gdb
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 1 /// <summary>将选中的line feature作为线文件存至gdb
 2  /// </summary>
 3  /// <param name="featureLayer">select layer</param>
 4  /// <param name="gdbPath">gdb路径</param>
 5  /// <param name="name">文件名称</param>
 6          public static void saveSelectLineFeatureToGDB(IMap map,IFeatureLayer featureLayer,string gdbPath,string name)
 7          {
 8              IFeatureClass inputFeatureClass = featureLayer.FeatureClass;
 9              IDataset inputDataset = (IDataset)inputFeatureClass;
10              IDatasetName inputDatasetName = (IDatasetName)inputDataset.FullName;
11  
12              // Get the layer's selection set. 
13              IFeatureSelection featureSelection = (IFeatureSelection)featureLayer;
14              ISelectionSet selectionSet = featureSelection.SelectionSet;
15  
16              IPropertySet ps = new PropertySetClass();
17              ps.SetProperty("DATABASE", gdbPath);
18  
19              IWorkspaceFactory wsf = new FileGDBWorkspaceFactoryClass();
20              IWorkspace ws = null;
21              try
22              {
23                  ws = wsf.Open(ps, 0);
24              }
25              catch (Exception e)
26              {
27                  Console.WriteLine(e.Message);
28              }
29              IDataset ds = (IDataset)ws;
30              IWorkspaceName wsName = (IWorkspaceName)ds.FullName;
31              IFeatureClassName featClsName = new FeatureClassNameClass();
32              IDatasetName dsName = (IDatasetName)featClsName;
33              dsName.WorkspaceName = wsName;
34              dsName.Name = name;
35              
36              //// Use the IFieldChecker interface to make sure all of the field names are valid for a shapefile. 
37              IFieldChecker fieldChecker = new FieldCheckerClass();
38              IFields shapefileFields = null;
39              IEnumFieldError enumFieldError = null;
40              fieldChecker.InputWorkspace = inputDataset.Workspace;
41              fieldChecker.ValidateWorkspace = ws;
42              fieldChecker.Validate(inputFeatureClass.Fields, out enumFieldError, out shapefileFields);
43  
44              // At this point, reporting/inspecting invalid fields would be useful, but for this example it's omitted.
45  
46 // We also need to retrieve the GeometryDef from the input feature class. 
47              int shapeFieldPosition = inputFeatureClass.FindField(inputFeatureClass.ShapeFieldName);
48              IFields inputFields = inputFeatureClass.Fields;
49  
50              IField shapeField = inputFields.get_Field(shapeFieldPosition);
51              IGeometryDef geometryDef = shapeField.GeometryDef;
52  
53              IGeometryDef pGeometryDef = new GeometryDef();
54              IGeometryDefEdit pGeometryDefEdit = pGeometryDef as IGeometryDefEdit;
55              pGeometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;
56              pGeometryDefEdit.SpatialReference_2 = map.SpatialReference;
57  
58              // Now we can create a feature data converter. 
59              IFeatureDataConverter2 featureDataConverter2 = new FeatureDataConverterClass();
60              IEnumInvalidObject enumInvalidObject = featureDataConverter2.ConvertFeatureClass(inputDatasetName, null,
61                  selectionSet, null, featClsName, pGeometryDef, shapefileFields, "", 1000, 0);
62  
63              // Again, checking for invalid objects would be useful at this point...
64  
65              inputFeatureClass = null;
66              ds = null;
67              ws = null;
68              wsf = null;
69          }
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编辑

编辑--删除
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 1             //加载目标点图层
 2 //IWorkspaceFactory toWsf = new ShapefileWorkspaceFactoryClass();
 3             IWorkspaceFactory toWsf = new FileGDBWorkspaceFactoryClass();
 4             IFeatureWorkspace toFeatWs = (IFeatureWorkspace)toWsf.OpenFromFile(fullGdbPath, 0); ;
 5             IFeatureClass toFeatCls = toFeatWs.OpenFeatureClass(pointLayerName);
 6 
 7             //编辑目标点图层
 8             IWorkspaceEdit toEdit = (IWorkspaceEdit)toFeatWs;
 9             try
10             {
11                 toEdit.StartEditing(true);
12                 toEdit.StartEditOperation();
13 
14                 IQueryFilter filter=new QueryFilterClass();
15                 filter.WhereClause="id=0";
16                 IFeatureCursor cursor = toFeatCls.Search(filter, false);
17 
18                 IFeature feature = cursor.NextFeature();
19 
20                 while(feature != null)
21                 {
22                     feature.Delete();
23                     feature = cursor.NextFeature();
24                 }
25 
26             }
27             catch (Exception e)
28             {
29                 Console.WriteLine(e.Message);
30             }
31             finally
32             {
33                 toEdit.StopEditOperation();
34                 toEdit.StopEditing(true);
35             }
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编辑--新增 
1 IFeature toFeature = toFeatCls.CreateFeature();
2                         ESRI.ArcGIS.Geometry.IPoint newPoint = new PointClass();
3                         newPoint.PutCoords(fromPoint.X, fromPoint.Y);
4                         toFeature.Shape = newPoint;
5                         toFeature.set_Value(2, nowPointId);
6                         toFeature.Store();

label

显示label
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 1         /// <summary>显示label
 2 /// </summary>
 3 /// <param name="map"></param>
 4 /// <param name="featLayer"></param>
 5 /// <param name="field"></param>
 6         public static void displayLabel(IMap map, IGeoFeatureLayer featLayer, string field)
 7         {
 8             featLayer.DisplayAnnotation = true;
 9             IAnnotateLayerPropertiesCollection pAnnProCol = featLayer.AnnotationProperties;
10             ILabelEngineLayerProperties pLabelEngine = null;
11             IAnnotateLayerProperties prop;
12             IBasicOverposterLayerProperties pBasicOverposterLayerProps = new BasicOverposterLayerProperties();
13             pBasicOverposterLayerProps.NumLabelsOption = esriBasicNumLabelsOption.esriOneLabelPerShape;
14             ITextSymbol symbol = new TextSymbolClass();
15             IColor c = new RgbColorClass();
16             c.RGB = 123;
17             symbol.Color = c;
18             symbol.Size = 4;
19 
20             IBasicOverposterLayerProperties bo = new BasicOverposterLayerPropertiesClass();
21             IPointPlacementPriorities ipp = new PointPlacementPrioritiesClass();
22             ipp.BelowCenter = 1;
23             bo.PointPlacementPriorities = ipp;
24             for (int i = 0; i < pAnnProCol.Count; i++)
25             {
26                 IElementCollection ec = new ElementCollectionClass();
27                 pAnnProCol.QueryItem(i, out prop, out ec, out ec);
28                 pLabelEngine = (ILabelEngineLayerProperties)prop;
29                 pLabelEngine.Expression = "[" + field + "]";
30                 pLabelEngine.Symbol = symbol;
31                 pLabelEngine.BasicOverposterLayerProperties = bo;
32             }
33 
34             ITrackCancel pCon = new CancelTracker();
35             pCon.Continue();
36             featLayer.Draw(esriDrawPhase.esriDPAnnotation, ((IActiveView)map).ScreenDisplay, pCon);
37         }
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label 转换为 Annotation
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 1         /// <summary>label2Annotation
 2 /// </summary>
 3 /// <param name="fullGdbPath"></param>
 4 /// <param name="featLayer"></param>
 5 /// <param name="displayField"></param>
 6         private void ConvertLabelsToGDBAnnotationSingleLayer(string fullGdbPath,IFeatureLayer featLayer,string displayField)
 7         {
 8             IMap map = m_map;
 9 
10             IPropertySet ps = new PropertySetClass();
11             ps.SetProperty("DATABASE", fullGdbPath);
12 
13             IWorkspaceFactory wsf = new FileGDBWorkspaceFactoryClass();
14             IWorkspace ws = wsf.Open(ps, 0);
15             IFeatureWorkspace featWs = (IFeatureWorkspace)ws;
16             IGeoFeatureLayer pGeoFeatureLayer = featLayer as IGeoFeatureLayer;
17             IFeatureClass featCls = pGeoFeatureLayer.FeatureClass;
18 
19             //设置指定字段为label字段并显示
20             Util.displayLabel(map, pGeoFeatureLayer, displayField);
21             ((IActiveView)map).PartialRefresh(esriViewDrawPhase.esriViewForeground, null, null);
22 
23             IConvertLabelsToAnnotation pConvertLabelsToAnnotation = new
24                 ConvertLabelsToAnnotationClass();
25             ITrackCancel pTrackCancel = new CancelTrackerClass();
26 
27             //Change global level options for the conversion by sending in different parameters to the next line.
28             pConvertLabelsToAnnotation.Initialize(map,
29                 esriAnnotationStorageType.esriDatabaseAnnotation,
30                 esriLabelWhichFeatures.esriAllFeatures, true, pTrackCancel, null);
31 
32             if (featCls != null)
33             {
34                 IDataset pDataset = featCls as IDataset;
35 
36                 //Add the layer information to the converter object. Specify the parameters of the output annotation feature class here as well.
37                 pConvertLabelsToAnnotation.AddFeatureLayer(pGeoFeatureLayer,
38                     pGeoFeatureLayer.Name + "_anno", featWs,
39                     featCls.FeatureDataset, true, false, false, true, true,
40                     "");
41 
42                 //Do the conversion.
43                 pConvertLabelsToAnnotation.ConvertLabels();
44                 IEnumLayer pEnumLayer = pConvertLabelsToAnnotation.AnnoLayers;
45 
46                 //Turn off labeling for the layer converted.
47                 pGeoFeatureLayer.DisplayAnnotation = false;
48 
49                 //Add the result annotation layer to the map.
50                 map.AddLayers(pEnumLayer, true);
51 
52                 //Refresh the map to update the display.
53                 IActiveView pActiveView = map as IActiveView;
54                 pActiveView.Refresh();
55             }
56         }
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GP

转换cad时，从shp转换cad不成功，从gdb中转换成功，原因不知。

GP:createCadXData需要在转换cad之前执行，给cad添加扩展属性

GP:shp2cad
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 1         /// <summary>GP:shp2cad
 2 /// </summary>
 3 /// <param name="fromFile"></param>
 4 /// <param name="toFile"></param>
 5         public static void convertGdb2Cad(string fromFile, string toFile)
 6         {
 7             Geoprocessor GP = new Geoprocessor();
 8 
 9             ESRI.ArcGIS.ConversionTools.ExportCAD tool = new
10                 ESRI.ArcGIS.ConversionTools.ExportCAD();
11             //tool.in_features = "d:/lzx/data/road/test.gdb/line_Annod";
12 //tool.Output_File = "d:/lzx/data/kk2.dwg";
13             tool.in_features = fromFile;
14             tool.Output_File = toFile;
15             tool.Output_Type = "DWG_R2004";
16             GP.Execute(tool, null);
17 
18             //MessageBox.Show("shp2cad ok");
19         }
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GP:shp export to gdb
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 1         /// <summary>GP:shp export to gdb
 2 /// </summary>
 3 /// <param name="fromFile"></param>
 4 /// <param name="toFile"></param>
 5         public static void convertShp2Gdb(string inputFeatures, string outputGdb, string outputName)
 6         {
 7 
 8             Geoprocessor GP = new Geoprocessor();
 9 
10             ESRI.ArcGIS.ConversionTools.FeatureClassToGeodatabase tool = new ESRI.ArcGIS.ConversionTools.FeatureClassToGeodatabase();
11             tool.Input_Features = inputFeatures;
12             tool.Output_Geodatabase = outputGdb;
13 
14             GP.Execute(tool, null);
15 
16             //MessageBox.Show("shp2gdb ok");
17 
18         }
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GP：将线文件的节点转换为点文件
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 1         /// <summary>将线文件的节点转换为点文件
 2 /// 使用gp
 3 /// </summary>
 4 /// <param name="fromFile"></param>
 5 /// <param name="toFile"></param>
 6         public static void convertFeatureVerticesToPoints(string fromFile, string toFile)
 7         {
 8             // Initialize the geoprocessor. 
 9             Geoprocessor GP = new Geoprocessor();
10 
11             ESRI.ArcGIS.DataManagementTools.FeatureVerticesToPoints tool = new
12                 ESRI.ArcGIS.DataManagementTools.FeatureVerticesToPoints();
13 
14             tool.in_features = fromFile;
15             tool.out_feature_class = toFile;
16             tool.point_location = "BOTH_ENDS";
17             GP.Execute(tool, null);
18         }
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GP:createCadXData
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 1         /// <summary>GP:createCadXData
 2 /// </summary>
 3 /// <param name="fromFile"></param>
 4 /// <param name="toFile"></param>
 5         public static void createCadXData(string fromFile,string field)
 6         {
 7             Geoprocessor GP = new Geoprocessor();
 8             CreateCADXData tool = new CreateCADXData(fromFile, field, "ArcGIS", "ADE");
 9             GP.Execute(tool, null);
10             //MessageBox.Show(" ok");
11         }
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地图显示/刷新

清除选择集并刷新
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 1         /// <summary>清除选择集并刷新
 2 /// </summary>
 3 /// <param name="map"></param>
 4         public static void clearSelectionInMap(IMap map)
 5         {
 6             IActiveView activeView = (IActiveView)map;
 7             activeView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null);
 8             map.ClearSelection();
 9             //需要在前后刷新2次
10             activeView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null);
11         }
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删除地图中除指定图层组外的其他图层
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 1         /// <summary>删除地图中除指定图层组外的其他图层
 2 /// </summary>
 3 /// <param name="map"></param>
 4 /// <param name="layerNames">不删除的图层列表</param>
 5         public static void clearLayers(IMap map, string[] layerNames)
 6         {
 7             Boolean isToDel = true;
 8             IEnumLayer layers = Util.getFeatureLayers(map);
 9             layers.Reset();
10             ILayer layer = null;
11             while ((layer = layers.Next()) != null)
12             {
13                 for (int i = 0; i < layerNames.Length; i++)
14                 {
15                     if (layer.Name == layerNames[i])
16                     {
17                         isToDel = false;
18                     }
19                 }
20                 if (isToDel)
21                 {
22                     map.DeleteLayer(layer);
23                     System.Runtime.InteropServices.Marshal.ReleaseComObject(layer);
24                 }
25             }
26         }
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删除地图中除指定图层外的其他图层
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 1         /// <summary>删除地图中除指定图层外的其他图层
 2 /// </summary>
 3 /// <param name="map"></param>
 4 /// <param name="layerNames">不删除的图层列表</param>
 5         public static void clearLayers(IMap map, string layerName)
 6         {
 7             Boolean isToDel = true;
 8             IEnumLayer layers = Util.getFeatureLayers(map);
 9             layers.Reset();
10             ILayer layer = null;
11             while ((layer = layers.Next()) != null)
12             {
13                 if (layer.Name != layerName)
14                 {
15                     map.DeleteLayer(layer);
16                     System.Runtime.InteropServices.Marshal.ReleaseComObject(layer);
17                 }
18             }
19         }
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缩放到指定要素并高亮显示
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 1         /// <summary>缩放到指定要素并高亮显示
 2 /// </summary>
 3 /// <param name="av"></param>
 4 /// <param name="env"></param>
 5         public static void zoomAndHighlight(IActiveView av, IGeometry geo)
 6         {
 7             av.GraphicsContainer.DeleteAllElements();
 8             av.Extent = geo.Envelope;
 9             IElement element = new LineElementClass();
10             element.Geometry = geo;
11 
12             IRgbColor color = new RgbColorClass();
13             color.Red = 255;
14             color.Green = 0;
15             color.Blue = 0;
16             ISimpleLineSymbol symbol = new SimpleLineSymbolClass();
17             symbol.Color = (IColor)color;
18             symbol.Width = 2;
19             symbol.Style = esriSimpleLineStyle.esriSLSSolid;
20             ((ILineElement)element).Symbol = (ILineSymbol)symbol;
21 
22             av.GraphicsContainer.AddElement(element, 0);
23             av.Refresh();
24         }
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Element

根据RGB值得到IColor
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1 public static IColor getColor(int R, int G, int B){
2     IRgbColor color=new RgbColorClass();
3     color.Red=R;
4     color.Green=G;
5     color.Blue=B;
6     return (IColor)color;
7 }
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根据多边形得到填充element
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 1 public static IElement getFillShapeElement(IGeometry geo){
 2     IElement element=new PolygonElementClass();
 3     element.Geometry=geo;
 4     
 5     ISimpleLineSymbol symbol=new SimpleLineSymbolClass();
 6     symbol.Color=getColor(255,0,0);
 7     symbol.Width=2;
 8     symbol.Style=esriSimpleLneStyle.esriSLSolid;
 9 
10     ISimpleFillSymbol fillSymbol=new SimpleFillSymbolClass();
11     fillSymbol.outline=(ILineSymbol)symbol;
12     fillSymbol.Color=getColor(255,250,200);
13     ((IFillShapeElement)element).symbol=(IFillSymbol)fillSymbol;
14 
15     return element;
16 }
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ArcGis Engine删除影像文件

　　当利用AE生成tiff、img等格式的影像文件时，需要检查是否存在同名文件，如果存在则替换原有文件。这里如果直接用System .IO .File .Delete (string path)方法删除原有文件会报错，这是由于该方法并没有完全清除影像文件附带的文件(如.aux，.rrd等)，导致生成新文件时发生冲突。

后来发现其实AE提供了自己的文件删除方法，就是先打开数据集，再调用数据集的Delete方法即可，代码如下：

IWorkspaceFactory pWSF = new RasterWorkspaceFactoryClass();
IRasterWorkspace pRWS = pWSF.OpenFromFile(pathName,0) as IRasterWorkspace;//pathName为路径名
IDataset pDataset = pRWS.OpenRasterDataset(fileName) as IDataset;//fileName为文件名(不包含路径)
pDataset.Delete();

　　对于矢量的shp文件，并没有进行尝试，以前是使用System .IO .File .Delete (string path)方法将shp格式数据包含的六个文件全部删除，现在想来应该也可以使用这种方式。

ArcGIS Engine属性查询并加亮显示（查询结果在其他窗体中显示）

2012-05-07 11:09 by beileierhao, 111 阅读,0评论,收藏,编辑

查询分为属性查询和空间查询。我现在做的是属性查询，用IQueryFilter

属性查询的基本步骤是:

1)获取要查询的图层

2）获取要素要素图层

3）获取要素集

4）用IQueryFilter进行过滤筛选

Dim pFeatureSelection As IFeatureSelection = CType(pFeatureLayer, IFeatureSelection)
Dim pQueryFilter As IQueryFilter = New QueryFilterClass()
pQueryFilter.WhereClause = (TypeComboBox.Text + TextBox1.Text)
pFeatureSelection.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultNew, False)

5）要将筛选出的要素集显示在数据表中，用ICursor和IFeatureCursor对每个要素进行遍历

在这里谈一下个人对ICursor和IFeatureCursor的理解。ICursor主要是针对所有的类型的行进行的操作，而IFeatureCursor则主要是针对地图的要素进行的操作。ICursor是IFeatureCursor的父类。

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Dim pCursor As ICursor = Nothing
pSelectionSet.Search(Nothing, True, pCursor) '找所有满足查询过滤器的行，返回一个ICursor。这是Nothing，所有返回了所有行。
Dim pFeatureCursor As IFeatureCursor = CType(pCursor, IFeatureCursor)
Dim pFeature As IFeature
pFeature = pFeatureCursor.NextFeature
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6）将各元素依次赋值给datatable，以datatable为数据源传给datagridview

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If pSelectionSet IsNot Nothing Then
            Dim dt As New DataTable
            Dim dc As DataColumn = Nothing
            For i = 1 To pFeatureLayer.FeatureClass.Fields.FieldCount
                dc = New DataColumn(pFeatureLayer.FeatureClass.Fields.Field(i - 1).Name)
                dt.Columns.Add(dc)
            Next

                Dim dr As DataRow
            While (pFeature IsNot Nothing)
                Dim pGeometry As IGeometry
                pGeometry = pFeature.Shape
                Dim obj As Object = Nothing
                My.Forms.MainForm.AxMapControl1.FlashShape(pGeometry, 3, 400, obj)
                dr = dt.NewRow
                Dim j As Integer
                For j = 0 To pFeature.Fields.FieldCount - 1 Step 1
                    If pFeatureLayer.FeatureClass.FindField(pFeatureLayer.FeatureClass.ShapeFieldName) = j Then
                        dr(j) = pFeatureLayer.FeatureClass.ShapeType.ToString()
                    Else
                        dr(j) = pFeature.Value(j).ToString()
                    End If
                Next
                dt.Rows.Add(dr)
                pFeature = pFeatureCursor.NextFeature()
            End While
            DataGridView1.DataSource = dt
        End If
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