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BOOK: Professional ASP.NET 3.5 : in C# and VB ISBN: 978-0-470-18757-9
This is the forum to discuss the Wrox book Professional ASP.NET 3.5: In C# and VB by Bill Evjen, Scott Hanselman, Devin Rader; ISBN: 9780470187579
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Old December 18th, 2008, 10:54 PM
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Default BuildProvider example not working

I'm having a problem not being able to get the example code in Chapter 1 on Build Providers working.

I have followed the steps in the section 'Using your own Build Providers' but my website code-behind cannot see the class 'Evjen'. This is what I've done:

1. Created a solution called CarBuildProvider with a Class Library project called CarBuildProvider. It contains a single class 'Car' which contains code as per page 48.
2. Built it.
3. Created a new ASP.NET Website called CarBuildProviderDriver containing the usual Default.aspx file.
4. Manually created the App_Code folder (as it wasn't there by default) by right-click on the project name->Add ASP.NET Folder->App_Code.
5. Added a Reference to the CarBuildProvider.dll file that was created in steps 1+2.
6. Added the respecitve <buildProvider> entry into web.config:
<add extension=".car" type="CarBuildProvider.Car"/>
7. Built it.
8. Dropped the EvjenCar.car file into the App_Code folder
9. Go to type in 'EvjenCar' in the Default.aspx Page_Load method.
Intellisense doesn't pick it up; it cannot resolve the class.

Have I missed something out?
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Old January 21st, 2009, 05:24 PM
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Default Problem

I am having the same problem. Wrox, what is the solution to this?
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Old August 26th, 2009, 11:00 AM
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Talking BuildProviders

I got it to work after 4 hours. The first code is for the CarBuilderProvider.dll I created a class library called CarBuildProvider. Complied it into a dll.

using System.IO;
using System.Web.Compilation;
using System.Xml;
using System.CodeDom;
namespace CarBuildProvider
classCar : BuildProvider
publicoverridevoid GenerateCode(AssemblyBuilder myAb)
XmlDocument carXmlDoc = newXmlDocument();
using(Stream passedFile = OpenStream())
XmlNode mainNode = carXmlDoc.SelectSingleNode("/car");
string selectionMainNode = mainNode.Attributes["name"].Value;
XmlNode colorNode = carXmlDoc.SelectSingleNode("/car/color");
string selectionColorNode = colorNode.InnerText;
XmlNode doorNode = carXmlDoc.SelectSingleNode("/car/door");
string selectionDoorNode = doorNode.InnerText;

XmlNode speedNode = carXmlDoc.SelectSingleNode("/car/speed");
string selectionSpeedNode = speedNode.InnerText;
CodeCompileUnit ccu = newCodeCompileUnit();
CodeNamespace cn = newCodeNamespace();
CodeMemberProperty cmp1 = newCodeMemberProperty();
CodeMemberProperty cmp2 = newCodeMemberProperty();
CodeMemberMethod cmm1 = newCodeMemberMethod();
cmp1.Name = "Color";
cmp1.Type = newCodeTypeReference(typeof(string));
cmp1.Attributes = MemberAttributes.Public;
cmp1.GetStatements.Add(newCodeSnippetExpression("return \"" + selectionColorNode + "\""));
cmp2.Name = "Doors";
cmp2.Type = newCodeTypeReference(typeof(int));
cmp2.Attributes = MemberAttributes.Public;
cmp2.GetStatements.Add(newCodeSnippetExpression("return " + selectionDoorNode));
cmm1.Name = "Go";
cmm1.ReturnType = newCodeTypeReference(typeof(int));
cmm1.Attributes = MemberAttributes.Public;
cmm1.Statements.Add(newCodeSnippetExpression("return " + selectionSpeedNode));
CodeTypeDeclaration ctd = newCodeTypeDeclaration(selectionMainNode);
myAb.AddCodeCompileUnit(this, ccu);

Next I created the ExampleBP website. I modified the web.config file and added the following under the <Compilation>:

addextension=".car"type="CarBuildProvider.Car" />

I created the Car.car xml file and placed it in the App_Code filder:

<?xmlversion="1.0"encoding="utf-8" ?>

Next I copied the CarBuilderProvider.dll and CarBuildProvider.pdb into the bin folder.

In the default.aspx file I added the following code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
publicpartialclass_Default : System.Web.UI.Page
protectedvoid Page_Load(object sender, EventArgs e)
EvjenCar newCar = newEvjenCar();
Response.Write(newCar.Color + "<br/>");
Response.Write(newCar.Doors.ToString() + "<br/>");
Response.Write(newCar.Go().ToString() + "<br/>");

I built the website and ran it and it worked. My mistake the web.config file was wrong. I only added type="CarBuildProvider". I included only the namespace and forgot to add the .Car class name. 4 hours of frustraton.

here is a link to a database version by Fritz Onion that helped my solve my problem:


At the bottom of the article you can download the code.

I hope this works.

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