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Implementing Model-View-Presenter in ASP.NET

, 17 Nov 2007
Three implementations of Model-View-Presenter in ASP.NET 2.0.
MVPSampleApp.zip
MVP.SampleApp
Lib
Microsoft.Practices.EnterpriseLibrary.Common.dll
Microsoft.Practices.EnterpriseLibrary.Data.dll
MySql.Data.dll
nunit.framework.dll
Rhino.Mocks.dll
Model
Data
Interfaces
Properties
Presentation
Presentation.Tests
Properties
Interfaces
Properties
SubSonic
ActiveRecord
Builder
CodeGeneration
Templates
CodeLanguage
Configuration
Controls
Calendar
lang
skin
active-bg.gif
calendar.gif
dark-bg.gif
hover-bg.gif
menuarrow.gif
normal-bg.gif
rowhover-bg.gif
status-bg.gif
title-bg.gif
today-bg.gif
Resources
DataProviders
Properties
Sql Tools
SubSonic.snk
Sugar
WebApp
App_Data
Views
SQL2000SampleDb.zip
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using System.Runtime;
using System.Collections;
using System.Xml;
using System.Xml.Serialization;
using System.Collections.Specialized;
using System.Configuration;
using System.Text.RegularExpressions;
using System.IO;

namespace SubSonic.CodeGenerator
{
    [Serializable]
    public class Template
    {
        private string projectDirectory = string.Empty;

        public string ProjectDirectory
        {
            get
            {
                projectDirectory = String.IsNullOrEmpty(projectDirectory) ? Directory.GetCurrentDirectory() : projectDirectory;
                return projectDirectory;
            }
            set { projectDirectory = value; }
        }

    	private ICodeLanguage language = new CSharpCodeLanguage();

        public ICodeLanguage Language
        {
            get { return language; }
            set { language = value; }
        }

        //no empty templates :)
        private Template()
        {
        }

        public Template(string input)
        {
            Input = input;
            Using_Libraries = GetUsings();
        }

        private string _Using_Libraries;

        public string Using_Libraries
        {
            get { return _Using_Libraries; }
            set { _Using_Libraries = value; }
        }

        public static ArrayList References
        {
            get { return GetReferences(); }
        }


        private bool _IsSuccessful;

        public bool IsSuccessful
        {
            get { return _IsSuccessful; }
            set { _IsSuccessful = value; }
        }


        private string _Input;

        public string Input
        {
            get { return _Input; }
            set { _Input = value; }
        }

        private string _GeneratedCode;

        public string GeneratedCode
        {
            get { return _GeneratedCode; }
            set { _GeneratedCode = value; }
        }

        private string _Output;

        public string Output
        {
            get { return _Output; }
            set { _Output = value; }
        }

        private string _Error;

        public string Error
        {
            get { return _Error; }
            set { _Error = value; }
        }

        private Exception _InnerException;

        [XmlIgnore]
        public Exception InnerException
        {
            get { return _InnerException; }
            set { _InnerException = value; }
        }

        private static string GetUsings()
        {
            StringBuilder sbUsings = new StringBuilder();
            sbUsings.AppendLine("using System;");
            sbUsings.AppendLine("using System.Text.RegularExpressions;");
            sbUsings.AppendLine("using System.Collections;");
            sbUsings.AppendLine("using System.IO;");
            sbUsings.AppendLine("using System.Text;");
            sbUsings.AppendLine("using SubSonic;");
            sbUsings.AppendLine("using SubSonic.CodeGenerator;");
            sbUsings.AppendLine("using System.Data;");
            sbUsings.AppendLine("using System.Configuration;");
            sbUsings.AppendLine("using SubSonic.Utilities;");
            return sbUsings.ToString();
        }

        private static ArrayList GetReferences()
        {
            ArrayList referenceList = new ArrayList();
            referenceList.Add("System.dll");
            referenceList.Add("System.Data.dll");
            referenceList.Add("System.Drawing.dll");
            referenceList.Add("System.Xml.dll");
            referenceList.Add("System.Windows.Forms.dll");
            referenceList.Add("System.Configuration.dll");

            Utilities.Utility.WriteTrace("Setting references");

            //find out where the dll is
            string subSonicLoc = typeof(Template).Assembly.Location;
            referenceList.Add(subSonicLoc);
            Utilities.Utility.WriteTrace("Loading SubSonic.dll from  " + subSonicLoc);

            return referenceList;
        }

        #region Rendering

        public string Render()
        {
            //parse it
            Parse();

            //compile it
            return Generate();
        }

        #endregion

        #region GenerateOutput specific functions

        private string Generate()
        {
            //string result;
            IsSuccessful = true;
        	ICodeLanguage iLanguage = new CSharpCodeLanguage();

            //string entry = "Render";
            string code = GeneratedCode.Trim();
            if (String.IsNullOrEmpty(code))
            {
                return string.Empty;
            }

            CompileEngine engine = new CompileEngine(code, iLanguage, "Render");
            engine.References = References;
            engine.Run();
            Output = engine.OutputText;
            return Output;
            //result = engine.OutputText;

            //return result;
        }

        private void Parse()
        {
            Input = Input + "<%%>";

            GeneratedCode = GetParsedResult();
            IsSuccessful = true;
        }

        public static string LoadTextFromManifest(string templateFileName)
        {
            string templateText = null;
            Assembly asm = Assembly.GetExecutingAssembly();
            Stream stream = asm.GetManifestResourceStream("SubSonic.CodeGeneration.Templates." + templateFileName);
            if (stream != null)
            {
                StreamReader sReader = new StreamReader(stream);
                templateText = sReader.ReadToEnd();
                sReader.Close();
            }
            return templateText;
        }

        private string GetParsedResult()
        {
            string modifiedcode = GetCodeWithoutAssemblyNameSpacePropertyAndOther();

            StringBuilder finalcode = new StringBuilder(Using_Libraries);
            //string finalcode = Using_Libraries +
            finalcode.Append(
                @"
namespace SubSonic.CodeGenerator
{
	/// <summary>
	/// Summary description for ParseManager.
	/// </summary>
	public class Parser
	{
		public Parser()
		{
			//
			// TODO: Add constructor logic here
			//
		}
		public static void Main()
		{			
		}
		public static string Render()
		{
			MemoryStream mStream = new MemoryStream();
			StreamWriter writer = new StreamWriter(mStream,System.Text.Encoding.UTF8);
			
			#:::#RenderMethod#:::#
//
            StreamReader sr = new StreamReader(mStream); 
			writer.Flush();
			mStream.Position = 0; 
			string returndata = sr.ReadToEnd();	
			return returndata;
		}
	}
}"
        );

            return Utilities.Utility.FastReplace(finalcode.ToString(), "#:::#RenderMethod#:::#", modifiedcode, StringComparison.InvariantCultureIgnoreCase);
            //finalcode = Regex.Replace(finalcode, "#:::#RenderMethod#:::#", modifiedcode);

            //return finalcode;
        }


        private string GetCodeWithoutAssemblyNameSpacePropertyAndOther()
        {
            string tempcode = Input;
            //Modify this part if you want to read the <%@ tags also you can implement your own tags here.
            tempcode = Regex.Replace(tempcode, "(?i)<%@\\s*Property.*?%>", string.Empty);
            tempcode = Regex.Replace(tempcode, "(?i)<%@\\s*Assembly.*?%>", string.Empty);
            tempcode = Regex.Replace(tempcode, "(?i)<%@\\s*Import.*?%>", string.Empty);
            tempcode = Regex.Replace(tempcode, "(?i)<%@\\s*CodeTemplate.*?%>", string.Empty);

            tempcode = ParseScript(tempcode);
            tempcode = Regex.Replace(tempcode, @"<%=.*?%>", new MatchEvaluator(RefineCalls), RegexOptions.Singleline);
            tempcode = Regex.Replace(tempcode, @"<%%>", string.Empty, RegexOptions.Singleline);
            tempcode = Regex.Replace(tempcode, @"<%[^=|@].*?%>", new MatchEvaluator(RefineCodeTag), RegexOptions.Singleline);

            //see if there's an @Page directive
            Regex regLang = new Regex(@"<%@.*?Language=.*?%>");
            Match pageDirMatch = regLang.Match(tempcode);
            if (pageDirMatch != null)
            {
                //there's a language directive
                string directive = pageDirMatch.Value;
                if (directive.ToLower().Contains("vb"))
                {
                	language = new VBCodeLanguage();
                }
            }

            //strip the directive
            tempcode = Regex.Replace(tempcode, "(?i)<%@\\s*Page.*?%>", string.Empty);

            return tempcode;
        }

        private static string RefineCalls(Match m)
        {
            // Get the matched string.
            string x = m.ToString();
            // If the first char is lower case...
            x = Regex.Replace(x, "<%=", "\t\t\twriter.Write(");
            x = Regex.Replace(x, "%>", ");");

            return x;
        }

        private static string RefineCodeTag(Match m)
        {
            // Get the matched string.
            string x = m.ToString();
            // If the first char is lower case...
            x = x.Substring(2, x.Length - 4);
            x = "\t\t\t" + x;


            return x;
        }

        private static string ParseScript(string lcCode)
        {
            if (lcCode == null)
            {
                return "";
            }
            MemoryStream mStream = new MemoryStream();
            StreamWriter writer = new StreamWriter(mStream, System.Text.Encoding.UTF8);

            int lnLast = 0;
            int lnAt = lcCode.IndexOf("<%", 0);
            if (lnAt == -1)
            {
                return lcCode;
            }

            while (lnAt > -1)
            {
                if (lnAt > -1)
                {
                    // *** Catch the plain text write out to the Response Stream as is - fix up for quotes
                    writer.Write("\t\t\twriter.Write(@\"" + lcCode.Substring(lnLast, lnAt - lnLast).Replace("\"", "\"\"") + "\" );");
                }

                //*** Find end tag
                int lnAt2 = lcCode.IndexOf("%>", lnAt);
                if (lnAt2 < 0)
                {
                    break;
                }

                writer.Write(lcCode.Substring(lnAt, lnAt2 - lnAt + 2));

                lnLast = lnAt2 + 2;
                lnAt = lcCode.IndexOf("<%", lnLast);
                if (lnAt < 0)
                {
                    // *** Write out the final block of non-code text
                    writer.Write("\t\t\twriter.Write(@\"" + lcCode.Substring(lnLast, lcCode.Length - lnLast).Replace("\"", "\"\"") + "\" );");
                }
            }

            writer.Flush();

            mStream.Position = 0;

            StreamReader sr = new StreamReader(mStream);

            string returndata = sr.ReadToEnd();
            return returndata;
        }

        #endregion
    }
}

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About the Author

Alex Mueller
Web Developer
United States United States
No Biography provided

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Web04 | 2.8.140821.2 | Last Updated 17 Nov 2007
Article Copyright 2007 by Alex Mueller
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