GIS program

Development Platform:
C#

FrmQuery.cs：Code Content
							using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.SystemUI;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
namespace ArcMap
{
    public partial class FrmQuery : Form
    {
        public IMapControl2 pMapControl;
        public IMap pMap;
        public int iLayerIndex;
        public int iFieldIndex;
        public FrmQuery(IMapControl2 pFMapControl)
        {
            InitializeComponent();
            pMapControl = pFMapControl;
            pMap = pFMapControl.Map;
        }
 
        private void FrmQuery_Load(object sender, EventArgs e)
        {                      
            ILayer pLayer;
            for (int i = 0; i < pMap.LayerCount; i++)
            {
                pLayer = pMap.get_Layer(i);
                cmbLayers.Items.Add(pLayer.Name);
            }
        }
        private void cmbLayers_TextChanged(object sender, EventArgs e)
        {
            iLayerIndex = cmbLayers.Items.IndexOf(cmbLayers.Text);
            cmbFields.Items.Clear();
        }
        //获得图层的字段名称
        private void cmbFields_DropDown(object sender, EventArgs e)
        {
            cmbFields.Items.Clear();
            IFeatureLayer pFeatureLayer;
            pFeatureLayer = (IFeatureLayer)pMap.get_Layer(iLayerIndex);
            IFields pFields;
            pFields = pFeatureLayer.FeatureClass.Fields;
            for (int i = 0; i < pFields.FieldCount; i++)
            {
                string fieldName;
                fieldName = pFields.get_Field(i).Name;
                cmbFields.Items.Add(fieldName);
            }
        }
        private void btnShowAllValue_Click(object sender, EventArgs e)
        {
            if (cmbFields.Text=="")
            {
                MessageBox.Show("请选择字段名", "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                return;
            }
            listBoxValue.Items.Clear();
            IFeatureLayer pFeatureLayer;
            pFeatureLayer = (IFeatureLayer)pMap.get_Layer(iLayerIndex);
            IFeatureCursor pFeatureCursor;
            pFeatureCursor = pFeatureLayer.FeatureClass.Search(null, false);
            IFeature pFeature;
            pFeature = pFeatureCursor.NextFeature();
            while(pFeature!=null)
            {
                string fldValue;
                if (cmbFields.Text == "Shape")
                {
                    fldValue = Convert.ToString(pFeature.Shape.GeometryType);
                }
                else
                    fldValue = Convert.ToString(pFeature.get_Value(iFieldIndex));             
                
                listBoxValue.Items.Add(fldValue);
                pFeature = pFeatureCursor.NextFeature();
            }
        }
        private void cmbFields_TextChanged(object sender, EventArgs e)
        {
            iFieldIndex = cmbFields.Items.IndexOf(cmbFields.Text);
        }
        private void listBoxValue_DoubleClick(object sender, EventArgs e)
        {
            txtValue.Text = Convert.ToString(listBoxValue.SelectedItem);
        }
        private void btnCancle_Click(object sender, EventArgs e)
        {
           // this.close();
        }
        private void btnQuery_Click(object sender, EventArgs e)
        {
            IActiveView pActiveView;
            pActiveView = (IActiveView)pMap;
            pMap.ClearSelection();
            pActiveView.Refresh();
            IQueryFilter pQueryFilter = new QueryFilterClass();         
            IFeatureLayer pFeatureLayer;
            pFeatureLayer = (IFeatureLayer)pMap.get_Layer(iLayerIndex);
            IFields pFields;
            pFields = pFeatureLayer.FeatureClass.Fields;
            IField pField;
            pField=pFields.get_Field(iFieldIndex);
            switch(pField.Type)
            {
                case esriFieldType.esriFieldTypeString:
                    pQueryFilter.WhereClause=cmbFields.Text + " = '" + txtValue.Text + "'";
                    break;
                case esriFieldType.esriFieldTypeDouble:
                case esriFieldType.esriFieldTypeInteger:
                case esriFieldType.esriFieldTypeSingle:
                case esriFieldType.esriFieldTypeSmallInteger:
                    pQueryFilter.WhereClause = cmbFields.Text + " = " + txtValue.Text ;
                    break;
            }
            IFeatureCursor pFeatureCursor;
            pFeatureCursor = pFeatureLayer.FeatureClass.Search(pQueryFilter, false);
            IFeature pFeature;
            pFeature = pFeatureCursor.NextFeature();
            while (pFeature!=null)
            {
                pMap.SelectFeature(pFeatureLayer, pFeature);
                pFeature = pFeatureCursor.NextFeature();
            }
            pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null);
        }
        private void btnTable_Click(object sender, EventArgs e)
        {
            frmTable fTable = new frmTable(pMapControl, cmbLayers.Text);
            fTable.Show();
        }
 
    }
}

						