webform1.aspx.cs

一本不错的基于donet的ArcIMS开发的电子资料,详细的介绍了ArcIMS的配置,以及大量开发案例.

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;

namespace sendArcXML
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox ArcXMLInputText;
		protected System.Web.UI.WebControls.TextBox ArcXMLOutputText;
		protected System.Web.UI.WebControls.Label Label1;
		protected System.Web.UI.WebControls.TextBox ArcIMSServerText;
		protected System.Web.UI.WebControls.Button ClearResponseButton;
		protected System.Web.UI.WebControls.Button DisplayButton;
		protected System.Web.UI.WebControls.Image ArcIMSImage;
		protected System.Web.UI.WebControls.Button GetServicesButton;
		protected System.Web.UI.WebControls.Label ServiceNameLabel;
		protected System.Web.UI.WebControls.DropDownList ServiceDDList;
		protected System.Web.UI.WebControls.Label RequestLabel;
		protected System.Web.UI.WebControls.DropDownList RequestDDList;
		protected System.Web.UI.WebControls.Button SendArcXMLButton;
		protected System.Web.UI.WebControls.Label Label2;
		protected System.Web.UI.WebControls.Label Label3;
		protected System.Web.UI.WebControls.DataGrid FeatureDataGrid;

		//Connection information for axl_list.mdb.  Be sure you change the path for
		//the Data Source to the correct location on your machine
		protected string theConnection = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\axl_list.mdb;";
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			// Put user code to initialize the page here
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.DisplayButton.Click += new System.EventHandler(this.DisplayButton_Click);
			this.ClearResponseButton.Click += new System.EventHandler(this.ClearResponseButton_Click);
			this.SendArcXMLButton.Click += new System.EventHandler(this.SendArcXMLButton_Click);
			this.GetServicesButton.Click += new System.EventHandler(this.GetServicesButton_Click);
			this.RequestDDList.SelectedIndexChanged += new System.EventHandler(this.RequestDDList_SelectedIndexChanged);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void SendArcXMLButton_Click(object sender, System.EventArgs e)
		{
			string CustomServiceName = "";

			localhost.ArcXML_Web_Service getReturnArcXML = new localhost.ArcXML_Web_Service();

			//Test for type of request.  GET_FEATURES, GET_GEOCODE, and GET_EXTRACT
			//must be rerouted using CustomService in the URL.
			if (ArcXMLInputText.Text.IndexOf("<GET_FEATURES") > -1) CustomServiceName = "Query";
			else if (ArcXMLInputText.Text.IndexOf("<GET_GEOCODE") > -1) CustomServiceName = "Geocode";
			else if (ArcXMLInputText.Text.IndexOf("<GET_EXTRACT") > -1) CustomServiceName = "Extract";
			DisplayButton.Visible = Boolean.Parse("False");
			ArcIMSImage.Visible = Boolean.Parse("False");
			FeatureDataGrid.Visible = Boolean.Parse("False");

			try
			{
				//string theCurrentService = TextBox1.Text;
				string theCurrentService =  ServiceDDList.SelectedItem.Text;

				string returnedArcXML = getReturnArcXML.sendMyArcXML(ArcXMLInputText.Text,ArcIMSServerText.Text,theCurrentService,CustomServiceName);

				ArcXMLOutputText.Text = returnedArcXML;

				//Display Show Map Button if IMAGE response is returned
				if (returnedArcXML.IndexOf("<IMAGE>") > -1)
				{
					DisplayButton.Text = "Show Map";
					DisplayButton.Visible = Boolean.Parse("True");
				}

				//Display Show Layout Button if LAYOUT response is returned
				else if (returnedArcXML.IndexOf("<LAYOUT>") > -1)
				{
					DisplayButton.Text = "Show Layout";
					DisplayButton.Visible = Boolean.Parse("True");
				}

				//Display Show Features Button if FEATURES response is returned and includes <FIELDS> (must have at least one record, and "newxml" must be used isntead of "xml")
				else if (returnedArcXML.IndexOf("<FEATURES>") > -1 &&  returnedArcXML.IndexOf("<FIELDS>") > -1)
				{
					DisplayButton.Text = "Show Features";
					DisplayButton.Visible = Boolean.Parse("True");
				}
			}

			catch(Exception error)
			{
				ArcXMLOutputText.Text = "The request did not process correctly.  Some likely reasons are:\n--The ArcIMS Server and Service combination you have is not valid.\n--The request you sent was blank.  \n\nThe returned error message is:\n\n" + error.Message;
			}
		}

		private void ClearResponseButton_Click(object sender, System.EventArgs e)
		{
			ArcXMLOutputText.Text = "";
			DisplayButton.Visible = Boolean.Parse("False");
			ArcIMSImage.Visible = Boolean.Parse("False");
		}

		private void DisplayButton_Click(object sender, System.EventArgs e)
		{
			//Display Show Map Button if IMAGE response is returned. This code parses
			//the IMAGE response for the URL.
			if (ArcXMLOutputText.Text.IndexOf("<IMAGE>") > -1 || ArcXMLOutputText.Text.IndexOf("<LAYOUT>") > -1)
			{ 
				int theURLstart=ArcXMLOutputText.Text.IndexOf("http://");
				int theURLend=ArcXMLOutputText.Text.IndexOf(".",theURLstart);
				ArcIMSImage.ImageUrl =ArcXMLOutputText.Text.Substring(theURLstart,theURLend - theURLstart + 4);
				ArcIMSImage.Visible = Boolean.Parse("True");
				FeatureDataGrid.Visible = Boolean.Parse("False");
			}

			//Display Show Features Button if FEATURES response is returned
			else if (ArcXMLOutputText.Text.IndexOf("<FEATURES>") > -1)
			{
				FeatureDataGrid.DataSource = procFeatureList();
				FeatureDataGrid.DataBind();
				FeatureDataGrid.Visible = Boolean.Parse("True");
				ArcIMSImage.Visible = Boolean.Parse("False");
			}
		}

		private ArrayList procFeatureList()
		{
			string theString = ArcXMLOutputText.Text;

			//Get the number of features returned
			int theStart = theString.IndexOf("<FEATURECOUNT",0) + 21;
			int theEnd = theString.IndexOf("hasmore",theStart) -2;
			string theItem = theString.Substring(theStart,theEnd - theStart);
			int theFeatureCount = Convert.ToInt32(theItem);
			
			//Get the column header items
			theStart = theString.IndexOf("<FIELDS");
			theEnd=0;
			int theFinish = theString.IndexOf("</FIELDS>",theStart);
			int numFields = 0;
			System.Text.StringBuilder sb = new System.Text.StringBuilder();
			ArrayList theArrayList = new ArrayList();
			int notFirst = 0;

			while (theStart > -1 && theStart < theFinish)
			{
				if (notFirst == 0) notFirst = 1; else sb.Append("<td>");
				theStart = theString.IndexOf("FIELD name=",theEnd) + 12;
				if (theEnd > theFinish) break; 
				theEnd = theString.IndexOf("value",theStart) - 2;
				theItem = theString.Substring(theStart,theEnd - theStart);
				sb.Append(theItem + "</td>");	
				numFields ++;
				theStart = theString.IndexOf("FIELD name=",theEnd);
			}
			sb.Remove(sb.Length-5,5);  //get rid of last </td>
			theArrayList.Add(sb.ToString());
			sb.Remove(0,sb.Length);  //empty the stringbuilder

			//Get the data for each column
			theStart = ArcXMLOutputText.Text.IndexOf("<FIELDS>");
			theEnd = 0;

			//for loop for each FEATURE
			for (int icounter = 0; icounter < theFeatureCount; icounter++)
			{
				//for loop for each FIELD within a FEATURE
				for (int jcounter = 0; jcounter < numFields; jcounter++)
				{
					if (jcounter > 0) sb.Append("<td>");
					theStart = theString.IndexOf("value=",theEnd) + 7;
					theEnd = theString.IndexOf("/>",theStart) - 2;
					theItem = theString.Substring(theStart,theEnd - theStart);
					sb.Append(theItem + "</td>");
				}
				sb.Remove(sb.Length-5,5);
				theArrayList.Add(sb.ToString());
				sb.Remove(0,sb.Length);
			}
			return theArrayList;
		}

		private void GetServicesButton_Click(object sender, System.EventArgs e)
		{
			try  //outer try
			{
				localhost.ArcXML_Web_Service getReturnArcXML = new localhost.ArcXML_Web_Service();

				string returnedArcXML = getReturnArcXML.sendMyArcXML("<GETCLIENTSERVICES/>",ArcIMSServerText.Text,"catalog","");  //bad return goes to outer catch

				//set up array to hold service names
				ArrayList theArrayList = new ArrayList();
				int theEnd = 0;
				string theService;
				int theStart=returnedArcXML.IndexOf("SERVICE");

				while (theStart > -1)
				{
					//parses the service names from the SERVICEINFO response.  All
					//services are parsed regardless of service type, so Feature and
					//Metadata Services will be listed too.
					theStart = returnedArcXML.IndexOf("SERVICE name=",theEnd) + 14;
					if (theStart < theEnd) break;
					theEnd = returnedArcXML.IndexOf("servicegroup",theStart) - 2;
					theService = returnedArcXML.Substring(theStart,theEnd - theStart);
					theArrayList.Add(theService);
				}
					
				ServiceNameLabel.Visible = Boolean.Parse("True");
				ServiceNameLabel.Text = "Service Name";

				theArrayList.Sort();  //alphabetize service list
				ServiceDDList.Visible = Boolean.Parse("True");
				ServiceDDList.Items.Clear();
				ServiceDDList.DataSource = theArrayList;
				ServiceDDList.DataBind();
				SendArcXMLButton.Enabled = Boolean.Parse("True");

				//Set up connection to database and bind info in tag column to
				//RequestDDList control
				OleDbConnection conn = new OleDbConnection(theConnection);
				OleDbCommand cmd = new OleDbCommand("SELECT tag FROM axl ORDER BY tag", conn);
				try  				//****inner try
				{
					conn.Open();
					IDataReader reader = cmd.ExecuteReader();
					RequestDDList.DataSource = reader;
					RequestDDList.DataTextField = "tag";
					RequestDDList.DataBind();
					reader.Close();
					RequestLabel.Visible = Boolean.Parse("True");
					RequestDDList.Visible = Boolean.Parse("True");
					RequestDDList.SelectedItem.Text = "GET_IMAGE";
					showAxl(conn);
				}

				catch(Exception error)  //********inner catch
				{
					ArcXMLInputText.Text = "The ArcXML samples database did not open correctly.  No ArcXML examples are included.  You will need to type in ArcXML requests.  To get a list of examples, try clicking the Get Services button again.  \n\nThe returned error message is:\n\n" + error.Message;
					RequestDDList.Visible = Boolean.Parse("False");
					RequestLabel.Visible = Boolean.Parse("False");
				}

				finally  //*****inner finally
				{
					conn.Dispose();
				}

			}
			catch  //outer catch
			{
				ServiceDDList.Visible = Boolean.Parse("False");
				DisplayButton.Visible = Boolean.Parse("False");
				ArcIMSImage.Visible = Boolean.Parse("False");
				ArcXMLOutputText.Text = "";
				ArcXMLInputText.Text = "";
				ServiceNameLabel.Visible = Boolean.Parse("True");
				ServiceNameLabel.Text = "No services at this time";
				ServiceNameLabel.ForeColor = Color.Yellow;
				FeatureDataGrid.Visible = Boolean.Parse("False");
				SendArcXMLButton.Enabled = Boolean.Parse("False");
				RequestDDList.Visible = Boolean.Parse("False");
				RequestLabel.Visible = Boolean.Parse("False");
			}
		}

		private void RequestDDList_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			OleDbConnection conn = new OleDbConnection(theConnection);
			try
			{
				conn.Open();
				showAxl(conn);
			}

			catch(Exception error)
			{
				ArcXMLInputText.Text = "The ArcXML samples database did not open correctly.  No ArcXML example is included.  \n\nThe returned error message is:\n\n" + error.Message;
			}

			finally
			{
				conn.Dispose();
			}
		}

		private void showAxl(OleDbConnection conn)
		{
			//Read ArcXML request from database based on what user selected in
			//RequestDDList dropdown list.  Even though only one record is selected
			//a while statement can be used to extract that record from the reader.
			OleDbCommand cmd = new OleDbCommand("SELECT axl FROM axl WHERE tag = '" + RequestDDList.SelectedItem + "'", conn);
			IDataReader reader = cmd.ExecuteReader();

			while (reader.Read())
			{
					ArcXMLInputText.Text = reader.GetString(0);
			}
			reader.Close();
		}
	}
}