目标：定制一个组件，选择不用的Layer，从地图AxMapControl上选择对象，并用DataGridView显示显性。
关键代码：
LayerSelectControl.Designer.cs
1 namespace LayerSelect 2 { 3 partial class LayerSelectControl 4 { 5 /// 6 /// Required designer variable. 7 /// 8 private System.ComponentModel.IContainer components = null; 9 10 /// 11 /// Clean up any resources being used.12 /// 13 /// true if managed resources should be disposed; otherwise, false.14 protected override void Dispose(bool disposing)15 {16 if (disposing && (components != null))17 {18 components.Dispose();19 }20 base.Dispose(disposing);21 }22 23 #region Component Designer generated code24 25 /// 26 /// Required method for Designer support - do not modify 27 /// the contents of this method with the code editor.28 /// 29 private void InitializeComponent()30 {31 this.comboBox1 = new System.Windows.Forms.ComboBox();32 this.textBox1 = new System.Windows.Forms.TextBox();33 this.dataGridView1 = new System.Windows.Forms.DataGridView();34 ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();35 this.SuspendLayout();36 // 37 // comboBox138 // 39 this.comboBox1.Dock = System.Windows.Forms.DockStyle.Top;40 this.comboBox1.FormattingEnabled = true;41 this.comboBox1.Location = new System.Drawing.Point(0, 0);42 this.comboBox1.Name = "comboBox1";43 this.comboBox1.Size = new System.Drawing.Size(228, 20);44 this.comboBox1.TabIndex = 0;45 this.comboBox1.SelectedIndexChanged += new System.EventHandler(this.comboBox1_SelectedIndexChanged);46 // 47 // textBox148 // 49 this.textBox1.Dock = System.Windows.Forms.DockStyle.Bottom;50 this.textBox1.Location = new System.Drawing.Point(0, 200);51 this.textBox1.Name = "textBox1";52 this.textBox1.Size = new System.Drawing.Size(228, 21);53 this.textBox1.TabIndex = 1;54 // 55 // dataGridView156 // 57 this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;58 this.dataGridView1.Dock = System.Windows.Forms.DockStyle.Fill;59 this.dataGridView1.Location = new System.Drawing.Point(0, 20);60 this.dataGridView1.Name = "dataGridView1";61 this.dataGridView1.RowTemplate.Height = 23;62 this.dataGridView1.Size = new System.Drawing.Size(228, 180);63 this.dataGridView1.TabIndex = 2;64 // 65 // LayerSelectControl66 // 67 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);68 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;69 this.Controls.Add(this.dataGridView1);70 this.Controls.Add(this.textBox1);71 this.Controls.Add(this.comboBox1);72 this.Name = "LayerSelectControl";73 this.Size = new System.Drawing.Size(228, 221);74 ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();75 this.ResumeLayout(false);76 this.PerformLayout();77 78 }79 80 #endregion81 82 private System.Windows.Forms.ComboBox comboBox1;83 private System.Windows.Forms.TextBox textBox1;84 private System.Windows.Forms.DataGridView dataGridView1;85 }86 } LayerSelectControl.cs
using System;using System.Collections;using System.Collections.Generic;using System.Data;using System.Windows.Forms;using ESRI.ArcGIS.Carto;using ESRI.ArcGIS.Controls;using ESRI.ArcGIS.Geometry;using ESRI.ArcGIS.Geodatabase;using ESRI.ArcGIS.SystemUI;namespace LayerSelect{ public partial class LayerSelectControl : UserControl { AxMapControl _axMapControl; IMap pMap; public LayerSelectControl() { InitializeComponent(); } public void setBuddy(AxMapControl axMapControl) { _axMapControl = axMapControl; pMap = _axMapControl.Map; _axMapControl_OnMapReplaced(null, null); _axMapControl.OnMapReplaced += new IMapControlEvents2_Ax_OnMapReplacedEventHandler(_axMapControl_OnMapReplaced); _axMapControl.OnMouseDown += new IMapControlEvents2_Ax_OnMouseDownEventHandler(_axMapControl_OnMouseDown); _axMapControl.OnSelectionChanged += new EventHandler(_axMapControl_OnSelectionChanged); } #region Event of axMapControl void _axMapControl_OnSelectionChanged(object sender, EventArgs e) { this.textBox1.Text = this.comboBox1.Text + " --- " + pMap.SelectionCount.ToString() + "features seleted---"; ILayer pLayer = pMap.Layer[comboBox1.SelectedIndex]; if(pLayer != null) { this.dataGridView1.DataSource = createDataTableWithSeletedData(pLayer, 100); } } void _axMapControl_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e) { if (e.button == 1) { pMap.ClearSelection(); IPoint pPoint = new PointClass(); pPoint.PutCoords(e.mapX, e.mapY); IEnvelope pEnvelope = _axMapControl.TrackRectangle(); pMap.SelectByShape(pEnvelope, null, false); _axMapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, pEnvelope); } } void _axMapControl_OnMapReplaced(object sender, IMapControlEvents2_OnMapReplacedEvent e) { this.comboBox1.Items.Clear(); pMap = _axMapControl.Map; for (int i = 0; i < pMap.LayerCount; i++) { this.comboBox1.Items.Add(pMap.Layer[i].Name); } } #endregion #region Event of comboBox1 private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) { IFeatureLayer pFeatureLayer; for (int i = 0; i < pMap.LayerCount; i++) { pFeatureLayer = pMap.Layer[i] as IFeatureLayer; if (i == comboBox1.SelectedIndex) { pFeatureLayer.Selectable = true; DataTable pDataTable = createDataTableWithData(pMap.Layer[i],100); dataGridView1.DataSource = pDataTable; } else { pFeatureLayer.Selectable = false; } } } #endregion #region Function of Create DataTabel DataTable createDataTableWithField(ILayer pLayer) { DataTable pDataTable = new DataTable(); ITable pTable = pLayer as ITable; IField pField = null; DataColumn pDataColumn; for (int i = 0; i < pTable.Fields.FieldCount; i++) { pField = pTable.Fields.get_Field(i); pDataColumn = new DataColumn(pField.Name); if (pField.Name == pTable.OIDFieldName) { pDataColumn.Unique = true; } pDataColumn.AllowDBNull = pField.IsNullable; pDataColumn.Caption = pField.AliasName; pDataColumn.DataType = System.Type.GetType(ParseFieldType(pField.Type)); pDataColumn.DefaultValue = pField.DefaultValue; if (pField.VarType == 8) { pDataColumn.MaxLength = pField.Length; } pDataTable.Columns.Add(pDataColumn); pField = null; pDataColumn = null; } return pDataTable; } DataTable createDataTableWithData(ILayer pLayer,int maxNumber) { DataTable pDataTable = createDataTableWithField(pLayer); string shapeType = getShape(pLayer); DataRow pDataRow = null; ITable pTable = pLayer as ITable; ICursor pCursor = pTable.Search(null, false); IRow pRow = pCursor.NextRow(); int n = 0;//the maxinum number of data show on the datagrids while (pRow != null) { pDataRow = pDataTable.NewRow(); for (int i = 0; i < pRow.Fields.FieldCount; i++) { if (pRow.Fields.get_Field(i).Type == esriFieldType.esriFieldTypeGeometry) { pDataRow[i] = shapeType; } else if (pRow.Fields.get_Field(i).Type == esriFieldType.esriFieldTypeBlob) { pDataRow[i] = "Element"; } else { pDataRow[i] = pRow.get_Value(i); } } pDataTable.Rows.Add(pDataRow); pDataRow = null; n++; if (n == maxNumber) { pRow = null; } else { pRow = pCursor.NextRow(); } } return pDataTable; } private DataTable createDataTableWithSeletedData(ILayer pLayer, int maxNumber) { DataTable pDataTable = createDataTableWithField(pLayer); string shapeType = getShape(pLayer); ILayer rLayer = getSelectedLayer(pMap, this.comboBox1.SelectedIndex); return createDataTableWithData(rLayer, maxNumber); } #endregion private static string ParseFieldType(esriFieldType fieldType) { switch (fieldType) { case esriFieldType.esriFieldTypeBlob: return "System.String"; case esriFieldType.esriFieldTypeDate: return "System.DateTime"; case esriFieldType.esriFieldTypeDouble: return "System.Double"; case esriFieldType.esriFieldTypeGeometry: return "System.String"; case esriFieldType.esriFieldTypeGlobalID: return "System.String"; case esriFieldType.esriFieldTypeGUID: case esriFieldType.esriFieldTypeInteger: return "System.Int32"; case esriFieldType.esriFieldTypeOID: return "System.String"; case esriFieldType.esriFieldTypeRaster: return "System.String"; case esriFieldType.esriFieldTypeSingle: return "System.Single"; case esriFieldType.esriFieldTypeSmallInteger: return "System.Int32"; case esriFieldType.esriFieldTypeString: return "System.String"; case esriFieldType.esriFieldTypeXML: return "System.String"; default : return "System.String"; } } private string getShape(ILayer pLayer) { IFeatureLayer pFeatLyr = pLayer as IFeatureLayer; switch (pFeatLyr.FeatureClass.ShapeType) { case esriGeometryType.esriGeometryPoint: return "Point"; case esriGeometryType.esriGeometryPolyline: return "Polyline"; case esriGeometryType.esriGeometryPolygon: return "Polygon"; default: return ""; } } private ILayer getSelectedLayer(IMap pMap,int index) { IFeatureLayer pnewfeat; IFeatureLayer pFeatLyr; pFeatLyr = pMap.get_Layer(index) as IFeatureLayer; IFeatureSelection pFeatSel = pMap.FeatureSelection as IFeatureSelection; IFeatureLayerDefinition pFeatLyrDef = pFeatLyr as IFeatureLayerDefinition; pnewfeat = pFeatLyrDef.CreateSelectionLayer("new" + pFeatLyr.Name, true, "", ""); ILayer rLayer = pnewfeat as ILayer; return rLayer; } }} 用法：使用public void setBuddy(AxMapControl axMapControl)绑定对象即可。
效果图片：
