统计"面"要素中"点"要素的个数.

步骤

　　1,创建字段 IFields

 /// <summary>
         /// 创建:"面"-"点数"的字段.
         /// </summary>
         /// <returns></returns>
         public static ESRI.ArcGIS.Geodatabase.IFields CreateFields() {
             ESRI.ArcGIS.Geodatabase.IField fieldId = new ESRI.ArcGIS.Geodatabase.FieldClass();
             //todo(IFieldEdit2).
             //面ID.
             ESRI.ArcGIS.Geodatabase.IFieldEdit2 fieldIdEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit2)fieldId;
             fieldIdEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeInteger;
             fieldIdEdit.Name_2 = "面ID";

             //点数.
             ESRI.ArcGIS.Geodatabase.IField fieldCount = new ESRI.ArcGIS.Geodatabase.FieldClass();
             ESRI.ArcGIS.Geodatabase.IFieldEdit2 fieldCountEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit2)fieldCount;
             fieldCountEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeInteger;
             fieldCountEdit.Name_2 = "个数";

             ESRI.ArcGIS.Geodatabase.IObjectClassDescription objClsDes = new ESRI.ArcGIS.Geodatabase.ObjectClassDescriptionClass();
             ESRI.ArcGIS.Geodatabase.IFields fields = objClsDes.RequiredFields;
             ESRI.ArcGIS.Geodatabase.IFieldsEdit fieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)fields;
             fieldsEdit.AddField(fieldId);
             fieldsEdit.AddField(fieldCount);
             return fields;
         }

　　2,根据Fields穿件 ITable

 /// <summary>
         /// Creates a table with some default fields.
         /// </summary>
         /// <param name="workspace">An IWorkspace2 interface</param>
         /// <param name="tableName">表名称,如: "owners"</param>
         /// <param name="fields">An IFields interface or Nothing.</param>
         /// <returns></returns>
         public static ESRI.ArcGIS.Geodatabase.ITable CreateTable(ESRI.ArcGIS.Geodatabase.IWorkspace2 workspace, System.String tableName, ESRI.ArcGIS.Geodatabase.IFields fields) {
             // create the behavior clasid for the featureclass
             ESRI.ArcGIS.esriSystem.UID uid = new ESRI.ArcGIS.esriSystem.UIDClass();
             // valid feature workspace not passed in as an argument to the method
             if (workspace == null) return null;

             ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featureWorkspace = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)workspace;

             // table with that name already exists return that table
             if (workspace.get_NameExists(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTTable, tableName))
                 return featureWorkspace.OpenTable(tableName);

             uid.Value = "esriGeoDatabase.Object";

             ESRI.ArcGIS.Geodatabase.IObjectClassDescription objClsDes = new ESRI.ArcGIS.Geodatabase.ObjectClassDescriptionClass();

             // if a fields collection is not passed in then supply our own
             if (fields == null) {
                 // create the fields using the required fields method
                 fields = objClsDes.RequiredFields;
                 ESRI.ArcGIS.Geodatabase.IFieldsEdit fieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)fields; // Explicit Cast

                 ESRI.ArcGIS.Geodatabase.IField field = new ESRI.ArcGIS.Geodatabase.FieldClass();

                 // create a user defined text field
                 ESRI.ArcGIS.Geodatabase.IFieldEdit fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;

                 // setup field properties
                 fieldEdit.Name_2 = "SampleField";
                 fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
                 fieldEdit.IsNullable_2 = true;
                 fieldEdit.AliasName_2 = "Sample Field Column";
                 fieldEdit.DefaultValue_2 = "test";
                 fieldEdit.Editable_2 = true;
                 fieldEdit.Length_2 = ;

                 // add field to field collection
                 fieldsEdit.AddField(field);
                 fields = (ESRI.ArcGIS.Geodatabase.IFields)fieldsEdit;
             }

             // Use IFieldChecker to create a validated fields collection.
             ESRI.ArcGIS.Geodatabase.IFieldChecker fieldChecker = new ESRI.ArcGIS.Geodatabase.FieldCheckerClass();
             ESRI.ArcGIS.Geodatabase.IEnumFieldError enumFieldError = null;
             ESRI.ArcGIS.Geodatabase.IFields validatedFields = null;
             fieldChecker.ValidateWorkspace = (ESRI.ArcGIS.Geodatabase.IWorkspace)workspace;
             fieldChecker.Validate(fields, out enumFieldError, out validatedFields);

             // The enumFieldError enumerator can be inspected at this point to determine
             // which fields were modified during validation.

             // create and return the table
             return featureWorkspace.CreateTable(tableName, validatedFields, uid, null, "");
         }

　　3,根据创建ITable的结构,统计"面"要素中"点"要素的个数

 /// <summary>
         /// 查询"面"要素中的"点个数".
         /// </summary>
         /// <param name="polygonFeatureClass">"面"要素类.</param>
         /// <param name="pointFeatureClass">"点"要素类.</param>
         /// <param name="t">ITable表.</param>
         /// <returns></returns>
         public static ESRI.ArcGIS.Geodatabase.ITable PointInPolygonCount(ESRI.ArcGIS.Geodatabase.IFeatureClass polygonFeatureClass, ESRI.ArcGIS.Geodatabase.IFeatureClass pointFeatureClass, ESRI.ArcGIS.Geodatabase.ITable t) {
             if (!(polygonFeatureClass.ShapeType == ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon))
                 throw new InvalidCastException("Statistics_Assist::PointInPolygonCount:polygonFeatureClass");
             if (!(pointFeatureClass.ShapeType == ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint))
                 throw new InvalidCastException("Statistics_Assist::PointInPolygonCount:pointFeatureClass");

             ESRI.ArcGIS.Geodatabase.ISpatialFilter polySpatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilterClass();
             polySpatialFilter.WhereClause = "name like '%辽宁%'"; //指定名称的"面"要素.

             ESRI.ArcGIS.Geodatabase.IFeatureCursor fCurPoly = polygonFeatureClass.Search(polySpatialFilter, false);
             ESRI.ArcGIS.Geodatabase.IFeature fPoly = null;
             while ((fPoly = fCurPoly.NextFeature()) != null) {
                 ESRI.ArcGIS.Geometry.IGeometry polyGeo = fPoly.Shape;
                 ESRI.ArcGIS.Geodatabase.ISpatialFilter pntSpatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilterClass();
                 pntSpatialFilter.Geometry = polyGeo;
                 //包含在"面"要素中的"点".
                 pntSpatialFilter.SpatialRel = ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum.esriSpatialRelContains;
                 ESRI.ArcGIS.Geodatabase.IFeatureCursor fCurPnt = pointFeatureClass.Search(pntSpatialFilter, false);
                 ESRI.ArcGIS.Geodatabase.IFeature fPnt = null;
                 int count = ;  ////"点"要素的个数.
                 while ((fPnt = fCurPnt.NextFeature()) != null)
                     ++count;

                 if (count != ) {
                     ESRI.ArcGIS.Geodatabase.IRow r = t.CreateRow();
                     r.set_Value(, fPoly.get_Value()); //注意的是,0下标是不可更改的(OID).
                     r.set_Value(, count);
                     r.Store();
                 }
             }

             return t;
         }

　　4,在住函数中调用

 try {
                 //面.
                 ESRI.ArcGIS.Carto.IFeatureLayer PolyFLyr = (ESRI.ArcGIS.Carto.IFeatureLayer)Engine.App_Code.Layer_Assist.GetLayerByName(mapCtrl_main.Map, "省市");

                 //点.
                 ESRI.ArcGIS.Carto.IFeatureLayer PntFLyr = (ESRI.ArcGIS.Carto.IFeatureLayer)Engine.App_Code.Layer_Assist.GetLayerByName(mapCtrl_main.Map, "地市级以上居民地");

                 //表.
                 string tPath = @"G:\doc\gis\1.400\data\feature";

                 //1,根据"表路径"和"表名"创建.
                 //ESRI.ArcGIS.Geodatabase.ITable tOri = Engine.App_Code.AttributeTable_Assist.CreateTable(tPath, "tOri");
                 //2,根据"表路径"和"表名",以及"字段"创建.
                 ESRI.ArcGIS.Geodatabase.IWorkspaceFactory2 wsf = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactoryClass();
                 ESRI.ArcGIS.Geodatabase.IWorkspace2 ws = (ESRI.ArcGIS.Geodatabase.IWorkspace2)wsf.OpenFromFile(tPath, );
                 ESRI.ArcGIS.Geodatabase.IFields fields = Engine.App_Code.AttributeTable_Assist.CreateFields();
                 ESRI.ArcGIS.Geodatabase.ITable t = Engine.App_Code.AttributeTable_Assist.CreateTable(ws, "fields_table_LiaoNing", fields);
                 //查询面中的点.
                 ESRI.ArcGIS.Geodatabase.ITable tRes = Engine.App_Code.Statistics_Assist.PointInPolygonCount(PolyFLyr.FeatureClass, PntFLyr.FeatureClass, t);
             }

可以通过"表路径"和"表名"创建ITable

 /// <summary>
         /// 创建表.
         /// </summary>
         /// <param name="tablePath">即将创建表的路径,如:"G:\doc\gis\1.400\data\feature"</param>
         /// <param name="tableName">表名,如:"owner"</param>
         /// <returns></returns>
         public static ESRI.ArcGIS.Geodatabase.ITable CreateTable(string tablePath, string tableName) {
             //需要注意的是必须为"IWorkspaceFactory2",不能为"IWorkspaceFactory".
             ESRI.ArcGIS.Geodatabase.IWorkspaceFactory2 wsf = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactoryClass();
             ESRI.ArcGIS.Geodatabase.IFeatureWorkspace fws = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)wsf.OpenFromFile(tablePath, );

             ESRI.ArcGIS.esriSystem.UID uid = new ESRI.ArcGIS.esriSystem.UIDClass();

             ESRI.ArcGIS.Geodatabase.IField fieldId = new ESRI.ArcGIS.Geodatabase.FieldClass();
             //todo(IFieldEdit2).
             //面ID.
             ESRI.ArcGIS.Geodatabase.IFieldEdit2 fieldIdEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit2)fieldId;
             fieldIdEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeInteger;
             fieldIdEdit.Name_2 = "面ID";

             //点数.
             ESRI.ArcGIS.Geodatabase.IField fieldCount = new ESRI.ArcGIS.Geodatabase.FieldClass();
             ESRI.ArcGIS.Geodatabase.IFieldEdit2 fieldCountEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit2)fieldCount;
             fieldCountEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeInteger;
             fieldCountEdit.Name_2 = "个数";

             ESRI.ArcGIS.Geodatabase.IObjectClassDescription objClsDes = new ESRI.ArcGIS.Geodatabase.ObjectClassDescriptionClass();
             ESRI.ArcGIS.Geodatabase.IFields fields = objClsDes.RequiredFields;
             ESRI.ArcGIS.Geodatabase.IFieldsEdit fieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)fields;
             fieldsEdit.AddField(fieldId);
             fieldsEdit.AddField(fieldCount);

             return fws.CreateTable(tableName, fields, uid, null, "");
         }