C# IFeatureLayer类代码示例

 public void Add(IFeatureLayer featureLayer)
 {
     if (m_FeatureLayerList.Contains(featureLayer))
         return;
     else
         m_FeatureLayerList.Add(featureLayer);
 }

        /// <summary>
        /// 获得选中的要素DataTable
        /// </summary>
        /// <param name="_featureLayer">IFeatureLayer</param>
        /// <returns>ICursor</returns>
        public static DataTable GetFeatureAttr(IFeatureLayer _featureLayer)
        {
            DataTable dt = new DataTable();
            IFeatureSelection featureSelection = _featureLayer as IFeatureSelection;
            ISelectionSet selectionSet = featureSelection.SelectionSet;

            ICursor cursor = null;
            try
            {
                selectionSet.Search(null, false, out cursor);

                //IRow row = cursor.NextRow();
                //while (row != null)
                //{
                //    IFeature feature = (IFeature)row;
                //    ITable table = row.Table;
                //    int nameIndex = table.FindField("PAC");
                //    if (nameIndex > 0)
                //    {
                //        string value = (string)feature.get_Value(nameIndex);
                //        MessageBox.Show(value);
                //        break;
                //    }
                //}
            }
            catch { }
            return dt;
        }

        //执行计算，输出计算结果信息字符串
        private string FieldCal(IFeatureLayer pFtLayer, string strExpression)
        {
            txtMessage.Text = "正在计算请稍后……\r\n";
            try
            {
                Geoprocessor Gp = new Geoprocessor();
                Gp.OverwriteOutput = true;
                CalculateField calField = new CalculateField();
                
                calField.expression = strExpression;

                Gp.Execute(calField, null);

                for (int i = 0; i < Gp.MessageCount; i++)
                {
                    txtMessage.Text += Gp.GetMessage(i).ToString() + "\r\n";
                }
                return "计算成功";
            }
            catch (Exception e)
            {
                txtMessage.Text += e.Message;
                return "计算失败" + e.Message;
            }
        }

 /// <summary>
 /// Show the properties of a feature layer in the legend.
 /// </summary>
 /// <param name="e"></param>
 public void ShowProperties(IFeatureLayer e)
 {
     using (var dlg = new LayerDialog(e, new FeatureCategoryControl()))
     {
         ShowDialog(dlg);
     }
 }

        public static void AddFeaturesToSelection(IFeatureLayer featureLayer, string fldName, string[] values)
        {
            if (featureLayer != null && values != null)
            {
                try
                {
                    //  IFeatureClass featureClass = featureLayer.FeatureClass;
                    IFeatureSelection featureSelection = featureLayer as IFeatureSelection;
                    if (featureSelection != null && values.Length > 0)
                    {
                        IQueryFilter qfilter = new QueryFilterClass();
                        string strGUIDs = string.Empty;
                        //construct Whereclause with OIDs
                        foreach (string guid in values)
                        {
                            if (string.IsNullOrEmpty(strGUIDs) == false)
                                strGUIDs += ",";

                            strGUIDs += string.Format("'{0}'", guid);
                        }

                        qfilter.WhereClause = string.Format("{0} IN ({1})", fldName, strGUIDs);

                        // ISelectionSet selectionSet = featureClass.Select(qfilter, esriSelectionType.esriSelectionTypeIDSet, esriSelectionOption.esriSelectionOptionNormal, workspace);

                        featureSelection.SelectFeatures(qfilter, esriSelectionResultEnum.esriSelectionResultNew, false);
                    }
                }
                catch { }
            }
        }

        private void comboBoxDataList_SelectedIndexChanged(object sender, EventArgs e)
        {
            string sLayerName = comboBoxDataList.Text;
            AxMapControl axMap = pMainFrm.getMapControl();


            try
            {
                for (int i = 0; i <= axMap.LayerCount - 1; i++)
                {
                    ILayer pLyr = axMap.get_Layer(i);
                    if (pLyr.Name == sLayerName)
                    {
                        if (pLyr is IFeatureLayer)
                        {
                            m_pInFeatLyr = pLyr as IFeatureLayer;

                        }
                    }
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);

            }
        }

    public bool joinTabletoFeatureLayer(IServerContext mapContext,
        ITable externalTable,
        IFeatureLayer featureLayer,
        string tableJoinField,
        string layerJoinField,
        esriJoinType joinType)
    {
        IDisplayTable pDispTable = featureLayer as IDisplayTable;

        IFeatureClass pFCLayer = pDispTable.DisplayTable as IFeatureClass;
        ITable pTLayer = (ITable)pFCLayer;

        string strJnFieldLayer = layerJoinField;
        string strJnFieldTable = tableJoinField;

        IMemoryRelationshipClassFactory pMemRelFact = (IMemoryRelationshipClassFactory)mapContext.CreateObject("esriGeoDatabase.MemoryRelationshipClassFactory");
        IRelationshipClass pRelClass = (IRelationshipClass)pMemRelFact.Open("Join",
                                                        (IObjectClass)externalTable, strJnFieldTable,
                                                        (IObjectClass)pTLayer, strJnFieldLayer,
                                                        "forward", "backward",
                                                        esriRelCardinality.esriRelCardinalityOneToOne);

        IDisplayRelationshipClass pDispRC = (IDisplayRelationshipClass)featureLayer;
        pDispRC.DisplayRelationshipClass(pRelClass, joinType);   //esriLeftOuterJoin
        IDisplayTable dt = (IDisplayTable)featureLayer;
        ITable jointable = dt.DisplayTable;

        bool retval = false;
        if (jointable is IRelQueryTable)
        {
            retval = true;
        }
        return retval;
    }

        /// <summary>
        ///  删除满足条件的停采线要素
        /// </summary>
        /// <params name="featureLayer">停采线图层</params>
        /// <params name="stopLineID">停采线ID</params>
        /// <returns>成功删除返回true</returns>
        public static bool DeleteLineFeature(IFeatureLayer featureLayer, string stopLineID)
        {
            try
            {
                IFeatureClass featureClass = featureLayer.FeatureClass;

                    IDataset dataset = (IDataset)featureClass;
                    IWorkspace workspace = dataset.Workspace;
                    IWorkspaceEdit workspaceEdit = workspace as IWorkspaceEdit;
                    workspaceEdit.StartEditing(false);
                    workspaceEdit.StartEditOperation();
                IQueryFilter queryFilter = new QueryFilterClass();
                queryFilter.WhereClause = string.Format("BID='{0}'", stopLineID);
                //Get table and row
                ITable esriTable = (ITable)featureLayer.FeatureClass;
                esriTable.DeleteSearchedRows(queryFilter);
                workspaceEdit.StopEditOperation();
                workspaceEdit.StopEditing(true);
                GIS.Common.DataEditCommon.g_pMyMapCtrl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewAll|esriViewDrawPhase.esriViewGeoSelection, null, null);
                return true;
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine("删除停采线要素出错：" + ex.Message);
                return false;
            }
        }

 public frmUpstreamCreateOwnerList(MainFrm _pMainFrm,IFeatureLayer _pParcelFeatLayer, IArray _pFeatArray)
 {
     pParcelFeatLayer = _pParcelFeatLayer;
     pFeatArray = _pFeatArray;
     pMainFrm = _pMainFrm;
     InitializeComponent();
 }

 public frmSymbol(IFeatureLayer featLayer,AxMapControl mapcontrol,AxTOCControl toccontrol)
 {
     InitializeComponent();
     this.Layer = featLayer;
     axmapcontrol = mapcontrol;
     axtoccontrol = toccontrol;
 }

        /// <summary>
        /// ���ݵ㼯���������Ҫ��
        /// </summary>
        /// <params name="featureLayer"></params>
        /// <params name="lstPoint"></params>
        public void CreateLine(IFeatureLayer featureLayer, List<IPoint> lstPoint, int ID)
        {
            //try
            //{
            IFeatureClass featureClass = featureLayer.FeatureClass;
            if (featureClass.ShapeType == esriGeometryType.esriGeometryPolyline)
            {
                IPointCollection multipoint = new MultipointClass();
                if (lstPoint.Count < 2)
                {
                    MessageBox.Show(@"��ѡ���������������ϵ�����", "��ʾ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    return;
                }
                ISegmentCollection pPath = new PathClass();
                ILine pLine;
                ISegment pSegment;
                object o = Type.Missing;
                for (int i = 0; i < lstPoint.Count - 1; i++)
                {
                    pLine = new LineClass();
                    pLine.PutCoords(lstPoint[i], lstPoint[i + 1]);
                    pSegment = pLine as ISegment;
                    pPath.AddSegment(pSegment, ref o, ref o);
                }
                IGeometryCollection pPolyline = new PolylineClass();
                pPolyline.AddGeometry(pPath as IGeometry, ref o, ref o);

                IDataset dataset = (IDataset)featureClass;
                IWorkspace workspace = dataset.Workspace;
                IWorkspaceEdit workspaceEdit = workspace as IWorkspaceEdit;

                workspaceEdit.StartEditing(true);
                workspaceEdit.StartEditOperation();

                IFeature feature = featureClass.CreateFeature();

                IGeometry geometry = pPolyline as IGeometry;
                DrawCommon.HandleZMValue(feature, geometry);//����ͼ��Zֵ����

                feature.Shape = pPolyline as PolylineClass;
                int iFieldID = feature.Fields.FindField(GIS_Const.FIELD_BID);
                feature.Value[iFieldID] = ID.ToString();
                feature.Store();
                workspaceEdit.StopEditOperation();
                workspaceEdit.StopEditing(false);

                IEnvelope envelop = feature.Shape.Envelope;
                DataEditCommon.g_pMyMapCtrl.ActiveView.Extent = envelop;
                DataEditCommon.g_pMyMapCtrl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, null);
            }
            else
            {
                MessageBox.Show(@"��ѡ����ͼ�㡣", "��ʾ", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            //}
            //catch
            //{
            //    return;
            //}
        }

 public FormFieldCalculation(IFeatureLayer pFeatureLayer, DataGridView dataGridView, string strField)
 {
     InitializeComponent();
     _FeatureLayer = pFeatureLayer;
     Field = strField;
     Gridviwe = dataGridView; 
 }

 /// <summary>
 /// Creates a new instance of the attribute Table editor form
 /// <param name="featureLayer">The feature layer associated with
 /// this instance and displayed in the editor</param>
 /// </summary>
 public AttributeDialog(IFeatureLayer featureLayer)
 {
     InitializeComponent();
     if (featureLayer != null)
     {
         tableEditorControl1.FeatureLayer = featureLayer;
     }
 }

        /// <summary>
        /// Creates a new instance of LayerDialog form to display the symbology and
        /// other properties of the specified feature layer
        /// </summary>
        /// <param name="selectedLayer">the specified feature layer that is
        /// modified using this form</param>
        public FeatureLayerDialog(IFeatureLayer selectedLayer)
        {
            InitializeComponent();

            _layer = selectedLayer;
            propertyGrid1.SelectedObject = _layer;
            Configure();
        }

 public TextToShapefile(IMapControlDefault mapControl, UIStatusBar pStatusBar)
 {
     m_mapControl = mapControl;
     IMap pMap = m_mapControl.ActiveView.FocusMap;
     m_FeatureLayer = pMap.get_Layer(0) as IFeatureLayer;
     m_statusBar = pStatusBar;
     frmW = new frmWaiting();
 }