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Detailed Message: There was an error during job agent execution. The operation will be retried. Similar errors in the next five minutes may not be logged.
Exception Message: An item with the same key has already been added. (type ArgumentException)
Exception Stack Trace:    at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at Microsoft.TeamFoundation.Framework.Server.TeamFoundationExtensionUtility.LoadExtensionTypeMap[T](String pluginDirectory)
   at Microsoft.TeamFoundation.Framework.Server.JobApplication.SetupInternal()
   at Microsoft.TeamFoundation.Framework.Server.JobServiceUtil.RetryOperationsUntilSuccessful(RetryOperations operations, Int32 maxTries, Int32& delayOnExceptionSeconds)

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public class MetadataProvider : DataAnnotationsModelMetadataProvider
{        
    private IConfigurationProvider _mapper;

    public MetadataProvider(IConfigurationProvider mapper)
    {           
        _mapper = mapper;
    }

    protected override System.Web.Mvc.ModelMetadata CreateMetadata(IEnumerable<Attribute> attributes, Type containerType, Func<object> modelAccessor, Type modelType, string propertyName)

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public class ValidatorProvider : DataAnnotationsModelValidatorProvider
{
    private IConfigurationProvider _mapper;

    public ValidatorProvider(IConfigurationProvider mapper) 
    {
        _mapper = mapper;
    }

    protected override System.Collections.Generic.IEnumerable<ModelValidator> GetValidators(System.Web.Mvc.ModelMetadata metadata, ControllerContext context, IEnumerable<Attribute> attributes)

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return new StatusResult(View(ViewModel), “user created succesfully”);

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return View(ViewModel).WithSuccessMessage(“user created succesfully”);
return RedirectToAction(“Index”).WithSuccessMessage(“user created succesfully”);

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public ActionResult Graph() {
 var data = null; //todo load some data
        return new PdfResult(data);
}

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[TestMethod]
public void Login_Success() {
 AuthenticationController controller = new AuthenticationController();
 ActionResult result = controller.Login(“user”, “123”);

 Assert.IsTrue(result.GetType() == typeof(LoginResult));
        Assert.AreEqual(“user”, ((LoginResult)result).Username);
}

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public ActionResult Login(string username, string password) {
 if(username != “user” || password != “123”) {
  ModelState.AddError(“username or password incorrect”);
  return View();
 }

  return new LoginResult(username); //I typically pass the actual user into the login result
}

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public ActionResult View(User entity) {
 UserEditModel model = //change entity into a edit model
 return View(model);
}

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[AutoMap(typeof(EventListViewModel))]
  public ActionResult Index(int? page)
  {
   page = page ?? 1;

   var entities = //load data from database
      .AsPagination(page.Value, 20); //pagination method from MVC Contrib

   return View(entities);
  }