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Asked: 2026-05-11T01:28:43+00:00

I have created a new solution with a minimal amount of code that represents

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I have created a new solution with a minimal amount of code that represents the issue I am having. This is the simplest I could get it down to.

namespace EntServ.BusinessObjects {     /// <summary>     /// Summary description for EntServSession     /// </summary>     public class EntServSession     {         public EntServSession()         {          }          public static EntServSession Login(string username, string password)         {             EntServSession ret = null;              if (username == 'test'  && password == 'pass')                 ret = new EntServSession();              return ret;         }      } }

I started with a new solution, and created one class in the App_Code folder with one static method similar to one of the methods I was having an issue with. I right-clicked on the classname, and click ‘Create Unit Tests…’. It offered to create a new Test project for me, I accepted the defaults and clicked okay. It generated the following file:

using EntServ.BusinessObjects; using Microsoft.VisualStudio.TestTools.UnitTesting; using Microsoft.VisualStudio.TestTools.UnitTesting.Web; using System.Data;  namespace EntServObjectTests {       /// <summary>     ///This is a test class for EntServSessionTest and is intended     ///to contain all EntServSessionTest Unit Tests     ///</summary>     [TestClass()]     public class EntServSessionTest     {           private TestContext testContextInstance;          /// <summary>         ///Gets or sets the test context which provides         ///information about and functionality for the current test run.         ///</summary>         public TestContext TestContext         {             get             {                 return testContextInstance;             }             set             {                 testContextInstance = value;             }         }          #region Additional test attributes         //          //You can use the following additional attributes as you write your tests:         //         //Use ClassInitialize to run code before running the first test in the class         //[ClassInitialize()]         //public static void MyClassInitialize(TestContext testContext)         //{         //}         //         //Use ClassCleanup to run code after all tests in a class have run         //[ClassCleanup()]         //public static void MyClassCleanup()         //{         //}         //         //Use TestInitialize to run code before running each test         //[TestInitialize()]         //public void MyTestInitialize()         //{         //}         //         //Use TestCleanup to run code after each test has run         //[TestCleanup()]         //public void MyTestCleanup()         //{         //}         //         #endregion           /// <summary>         ///A test for Login         ///</summary>         // TODO: Ensure that the UrlToTest attribute specifies a URL to an ASP.NET page (for example,         // http://.../Default.aspx). This is necessary for the unit test to be executed on the web server,         // whether you are testing a page, web service, or a WCF service.         [TestMethod()]         [HostType('ASP.NET')]         [AspNetDevelopmentServerHost('%PathToWebRoot%\\EntServ2-ASP.NET\\trunk\\WWW', '/WWW')]         [UrlToTest('http://localhost/WWW')]         public void LoginTest()         {             string username = string.Empty; // TODO: Initialize to an appropriate value             string password = string.Empty; // TODO: Initialize to an appropriate value             EntServSession expected = null;             EntServSession actual = EntServSession_Accessor.Login(username, password);             Assert.AreEqual(expected, actual);             Assert.Inconclusive('Verify the correctness of this test method.');         }      } }

I tried running the test and it tries to compile and I get the build error:

Error   1    The type or namespace name 'EntServSession' could not be found  (are you missing a using directive or an assembly reference?)   C:\Projects\EntServ-ASP.NET\trunk\Tests\EntServObjectTests\EntServSessionTest.cs 82 13 EntServObjectTests

I publish the web site and put a reference to the App_code.dll in the test project and I no longer get a build error. I instead get the following exception error. I put break points on every line of the class, and the debugger does not stop on any line .

Error Message Test method EntServObjectTests.EntServSessionTest.LoginTest threw exception:  System.InvalidCastException: Unable to cast object of type 'EntServ2.BusinessObjects.EntServSession' to type 'EntServ2.BusinessObjects.EntServSession'..  Stack Trace EntServ2.BusinessObjects.EntServSession_Accessor.Login(String username, String password) EntServObjectTests.EntServSessionTest.LoginTest() in C:\Projects\EntServ2-ASP.NET\trunk\Tests\EntServObjectTests\EntServSessionTest.cs: line 83
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1 Answer

  1. Re-edit:

    I can’t really solve your exact problem the InvalidCastException as this is probably one of those red-herring / rabbit holes problems that take you days to figure out and much hair pulling out. I am sure it will have something to do with assembly versions being different when you are publishing them??

    I don’t usually do this and you can vote me down for bad advice, but can I recommend that you convert your asp.net website to a web application? (either this or move the offending code to a class library). I know that this is not the answer you are looking for, but it’s tough love what can I say. You will find in the long run it will be far easier and I won’t go into all the benefits as I’m sure you will have heard of them or can google them.

    I am sure that this will be a much quicker solution to your problem… and after all who really wants to publish their site each time they run their unit-tests?

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