GIS编程

开发平台：
C#

frmBus.cs：源码内容
							using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
namespace MainSystem
{
	/// <summary>
	/// Summary description for frmBus.
	/// </summary>
	public class frmBus : System.Windows.Forms.Form
	{
		private frmMain _frmMain;
		private bool	_bTextBox1 = true;
		private bool	_bTextBox2 = true;
		private System.Windows.Forms.Label _label_end;
		private System.Windows.Forms.Label _label_start;
		private System.Windows.Forms.ListBox _listBox_end;
		private System.Windows.Forms.ListBox _listBox_start;
		private System.Windows.Forms.Button _button_search;
		private System.Windows.Forms.TextBox _textBox_end;
		private System.Windows.Forms.TextBox _textBox_start;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		public frmBus(frmMain frm)
		{
			_frmMain = frm;
			InitializeComponent();
		}
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}
		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this._label_end = new System.Windows.Forms.Label();
			this._label_start = new System.Windows.Forms.Label();
			this._listBox_end = new System.Windows.Forms.ListBox();
			this._listBox_start = new System.Windows.Forms.ListBox();
			this._button_search = new System.Windows.Forms.Button();
			this._textBox_end = new System.Windows.Forms.TextBox();
			this._textBox_start = new System.Windows.Forms.TextBox();
			this.SuspendLayout();
			// 
			// _label_end
			// 
			this._label_end.Font = new System.Drawing.Font("SimSun", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this._label_end.Location = new System.Drawing.Point(152, 8);
			this._label_end.Name = "_label_end";
			this._label_end.Size = new System.Drawing.Size(80, 16);
			this._label_end.TabIndex = 14;
			this._label_end.Text = "终点站:";
			// 
			// _label_start
			// 
			this._label_start.Font = new System.Drawing.Font("SimSun", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this._label_start.Location = new System.Drawing.Point(8, 8);
			this._label_start.Name = "_label_start";
			this._label_start.Size = new System.Drawing.Size(80, 16);
			this._label_start.TabIndex = 13;
			this._label_start.Text = "起点站:";
			// 
			// _listBox_end
			// 
			this._listBox_end.ItemHeight = 12;
			this._listBox_end.Location = new System.Drawing.Point(152, 56);
			this._listBox_end.Name = "_listBox_end";
			this._listBox_end.Size = new System.Drawing.Size(128, 208);
			this._listBox_end.TabIndex = 12;
			this._listBox_end.MouseDown += new System.Windows.Forms.MouseEventHandler(this._listBox_end_MouseDown);
			this._listBox_end.SelectedIndexChanged += new System.EventHandler(this._listBox_end_SelectedIndexChanged);
			// 
			// _listBox_start
			// 
			this._listBox_start.ItemHeight = 12;
			this._listBox_start.Location = new System.Drawing.Point(8, 56);
			this._listBox_start.Name = "_listBox_start";
			this._listBox_start.Size = new System.Drawing.Size(128, 208);
			this._listBox_start.TabIndex = 11;
			this._listBox_start.MouseDown += new System.Windows.Forms.MouseEventHandler(this._listBox_start_MouseDown);
			this._listBox_start.SelectedIndexChanged += new System.EventHandler(this._listBox_start_SelectedIndexChanged);
			// 
			// _button_search
			// 
			this._button_search.Location = new System.Drawing.Point(296, 24);
			this._button_search.Name = "_button_search";
			this._button_search.Size = new System.Drawing.Size(72, 24);
			this._button_search.TabIndex = 10;
			this._button_search.Text = "查询";
			this._button_search.Click += new System.EventHandler(this._button_search_Click);
			// 
			// _textBox_end
			// 
			this._textBox_end.Location = new System.Drawing.Point(152, 24);
			this._textBox_end.Name = "_textBox_end";
			this._textBox_end.Size = new System.Drawing.Size(128, 21);
			this._textBox_end.TabIndex = 9;
			this._textBox_end.Text = "";
			this._textBox_end.TextChanged += new System.EventHandler(this._textBox_end_TextChanged);
			// 
			// _textBox_start
			// 
			this._textBox_start.Location = new System.Drawing.Point(8, 24);
			this._textBox_start.Name = "_textBox_start";
			this._textBox_start.Size = new System.Drawing.Size(128, 21);
			this._textBox_start.TabIndex = 8;
			this._textBox_start.Text = "";
			this._textBox_start.TextChanged += new System.EventHandler(this._textBox_start_TextChanged);
			// 
			// frmBus
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(376, 273);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this._label_end,
																		  this._label_start,
																		  this._listBox_end,
																		  this._listBox_start,
																		  this._button_search,
																		  this._textBox_end,
																		  this._textBox_start});
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.SizableToolWindow;
			this.Name = "frmBus";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "选择乘车路线";
			this.Load += new System.EventHandler(this.frmBus_Load);
			this.ResumeLayout(false);
		}
		#endregion
		private void frmBus_Load(object sender, System.EventArgs e)
		{
			LoadListBox();
		}
		private void LoadListBox()
		{
			_listBox_start.DataSource  = _frmMain._environment.m_dataSet.Tables["公交车站"];
			_listBox_start.DisplayMember = "站名";
			_listBox_end.DataSource  = _frmMain._environment.m_dataSet.Tables["公交车站2"];
			_listBox_end.DisplayMember = "站名";
		}
		private void _listBox_start_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			if (!_bTextBox1)
				this._textBox_start.Text = _listBox_start.Text;
		}
		private void _listBox_end_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			if (!_bTextBox2)
				this._textBox_end.Text = _listBox_end.Text;
		}
		private void _textBox_start_TextChanged(object sender, System.EventArgs e)
		{
			int nIndex = this._listBox_start.FindString(this._textBox_start.Text,-1); 
			if (nIndex != ListBox.NoMatches )
			{
				_listBox_start.SelectedIndex = nIndex;
			}
			if ((this._textBox_end.Text != "") && (this._textBox_start.Text != ""))
				this._button_search.Enabled = true;
			else
				this._button_search.Enabled = false; 
			_bTextBox1 = true;
		}
		private void _textBox_end_TextChanged(object sender, System.EventArgs e)
		{
			int nIndex = this._listBox_end.FindString(this._textBox_end.Text,-1); 
			if (nIndex != ListBox.NoMatches )
			{
				_listBox_end.SelectedIndex = nIndex;
			}
			if (this._textBox_end.Text != "" && this._textBox_start.Text != "")
				this._button_search.Enabled = true;
			else
				this._button_search.Enabled = false; 
			_bTextBox2 = true;
		}
		private void _listBox_start_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			_bTextBox1 = false;
		}
		private void _listBox_end_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			_bTextBox2 = false;
		}
		private void _button_search_Click(object sender, System.EventArgs e)
		{
			//判断站名的正确性
			if (!IsValidStation(this._textBox_start.Text))
			{
				MessageBox.Show("错误的起始站名。","北京市地理信息公众查询系统",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			if (!IsValidStation(this._textBox_end.Text))
			{
				MessageBox.Show("错误的终点站名。","北京市地理信息公众查询系统",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			CEnvironment env = _frmMain._environment;
			System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor;  
			ArrayList array = new ArrayList();
			env.m_path.Search(this._textBox_start.Text,_textBox_end.Text,array);
			System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.Arrow;  
  
			if (array.Count ==0)
			{
				MessageBox.Show("没有合适的乘车路线。","北京市地理信息公众查询系统",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			else
			{
				frmBusResult frm = new frmBusResult(this._frmMain,array);
				this.Visible = false;
				frm.ShowDialog(_frmMain); 
				this.Close();
			}
		}
		private bool IsValidStation(string szStation)
		{
			System.Data.DataTable indexTbl = _frmMain._environment.m_dataSet.Tables["公交车站"];		
			System.Data.DataRow[] rowsType = indexTbl.Select("站名='"+szStation+"'");
			if (rowsType.Length > 0)
				return true;
			return false;
		}
	}
}

						