Chris Hampson » Uncategorized

cannot be loaded because the execution of scripts is disabled on this system

Chris Hampson — Wed, 20 Jan 2010 23:13:46 +0000

To enable running unsigned powershell scripts on your system.

Set-ExecutionPolicy Unrestricted

Easy!

Event handlers can only be bound to HttpApplication events during IHttpModule initialization.

Chris Hampson — Mon, 10 Aug 2009 06:10:52 +0000

If you ever get this error it is because you are trying to access the HttpApplication context outside of its intialisation pipeline and more than likely you are using IIS7.

This error is easily fixed you must add this code block to your Global.asax and move the offending code inside it and no more errors

public override void Init()
{
    base.Init();
    //offending code here
}

ASP.NET MVC StrongRoutes AppAir.Web Preview Release

Chris Hampson — Thu, 06 Aug 2009 00:13:58 +0000

Today is a preview release of the AppAir.Web utility library for ASP.NET MVC.

What is included is StrongRoutes and two helper functions to clean up your views. The general idea is you have static classes for routes so they can be referenced anywhere in your Controllers and Views without using nasty Magic Strings.

If you like what you see or have some suggestions give me a shoutout via here or tweeter @bleevo.

All code is licensed as MIT
Source Code: http://github.com/bleevo/AppAir.Web/tree/master
Direct Download: http://github.com/bleevo/AppAir.Web/zipball/master

View

<%=Html.LinkTo("Register", UserRoutes.Register)%>
<a href="<%=Url.LinkTo(UserRoutes.Register)%>">Registera>

Global.asax

public class MvcApplication : System.Web.HttpApplication
{
	public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
		AppAir.Web.Routing.StrongRouteRegistrar.MapFrom(typeof(UserRoutes), routes);
    }
 
    protected void Application_Start()
    {
		RegisterRoutes(RouteTable.Routes);
	}
}
 
public static class UserRoutes
{
	[RouteOrder(2)]
	public static readonly StrongRoute Register 
		= StrongRoute.Map<UserController>("register", c => c.Register());
 
	[RouteOrder(1)]
	public static readonly StrongRoute Logout 
		= StrongRoute.Map<UserController>("logout", c => c.Logout());
 
	public static readonly StrongRoute Login 
		= StrongRoute.Map<UserController>("login", c => c.Login());
}

Introducing StrongRoutes for ASP.NET MVC

Chris Hampson — Mon, 03 Aug 2009 22:42:17 +0000

UPDATE PREVIEW RELEASED http://www.bleevo.com/2009/08/aspnet-mvc-strongroutes-appairweb-preview-release/

Just a little preview of something I am working on that will be available soon.

public static class SubmissionRoutes
{
    [RouteOrder(1)]
    public static readonly StrongRoute Create 
      = StrongRoute.Map<SubmissionController>("submission/create", c => c.CreateSubmission(null));
}

Usage:

<%=Html.LinkTo("Create", SubmissionRoutes.Create)%>

ASP.NET MVC Request.Files empty

Chris Hampson — Mon, 03 Aug 2009 08:09:24 +0000

Trying to get File uploads to work in ASP.NET MVC but Request.Files is always empty?

There a few things you might have done wrong!

The form tag must have enctype=”multipart/form-data” and your file input tag must have a name not just an id like below.

<% using(Html.BeginRouteForm("submission_create_path", FormMethod.Post,
 new { enctype = "multipart/form-data" })) { %>
    <input id="sourceCode" name="sourceCode" type="file" />
    <input type="submit" value="Upload" />
<% } %>

Attempting to load a 64-bit application, however this CPU is not compatible with 64-bit mode

Chris Hampson — Mon, 03 Aug 2009 07:50:59 +0000

If you get this error using VMWare ESX 4.0 it is because either your CPU does not meet the minimum hardware requirements for 64bit guest operating systems or you have not properly configured the host hardware.

The following knowledge base article describes the settings required to be enabled in the bios for both AMD and Intel CPU architectures.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1901

Urlorize Extensions

Chris Hampson — Sun, 02 Aug 2009 12:04:58 +0000

Urlorize converts strings to Url friendly strings.

public static class UrlorizeExtensions
{
    private readonly static Regex cleaner = new Regex("[^a-z0-9 ]+", RegexOptions.IgnoreCase);
    private readonly static Regex spaceMinimizer = new Regex("[ ]+", RegexOptions.IgnoreCase);
 
    public static string Urlorize(this HtmlHelper helper, string value)
    {
        value = cleaner.Replace(value, " ");
        value = spaceMinimizer.Replace(value, " ");
        value = value.Replace(" ", "-");
        return value.ToLower();
    }
}

Usage:

<%=Html.Urlorize("test test test") %>

NHiberante Error Invalid index 1 for this SqlParameterCollection with Count 1

Chris Hampson — Sun, 02 Aug 2009 04:52:11 +0000

Invalid index 1 for this SqlParameterCollection with Count=1

If you ever get this error it could be because your property mappings are mapped to the same column.

 name="FirstName" column="FirstName" type="string" not-null="true" />
 name="LastName" column="FirstName" type="string" not-null="true" />

This will cause this error, the fix is to map your properties correctly.

 name="FirstName" column="FirstName" type="string" not-null="true" />
 name="LastName" column="LastName" type="string" not-null="true" />

System.Linq.Enumerable.Any – Better Know an Extension Method Part 3

Chris Hampson — Thu, 19 Feb 2009 23:00:50 +0000

During this series I will be investigating the purpose and uses of the Extension methods made available in the System.Linq namespace specifically for classes that implement IEnumerable. If you have any gems you have created for the extension in question drop a comment below as I would love to see what people are coming up with. In Part 3 I will be exploring the very simple Any extension method described in the MSDN documentation as follows.

“Determines whether a sequence contains any elements.” – MSDN

When I first started looking at Any it seemed really strange at first, the first override just returns true if the Enumeration is greater than 0 which quite frankly is bizarre since its a direct copy of Count. It would just prove a neater way to write Linq expressions rather than the alternative using Count.

 
var orders = new List<Order>()
{
     new Order() {Total = 123.23},
     new Order() {Total = 512},
     new Order() {Total = 123.23},
     new Order() {Total = 5172.34},
     new Order() {Total = 647.518},
     new Order() {Total = 368.180},
     new Order() {Total = 12.84},
     new Order() {Total = 947.25},
};
 
if (orders.Any())
{
    //do something
}
 
if (orders.Count > 0)
{
    //do something
}

Both achieve the very same thing the second override is really useful it allows you to test all the items in the Enumeration for at least one match condition.

 
if (orders.Any(order => order.Total > 900))
{
    //do something
}

I am really struggling to come up with a good real world example of how/when to use Any so I wont at this time. But if you find yourself writing this code below, dont!

bool result = false;
foreach(var order in orders)
{
    if (order.Total > 900)
    { 
        result = true;
        break;
    }
}
 
if (result)
{
    //do something
}

Robot Overlords

Chris Hampson — Thu, 19 Feb 2009 01:49:55 +0000

http://blogs.wsj.com/photojournal/2009/02/17/pictures-of-the-day-115/

Reminds me of this painting in a spooky way. I for one welcome my new Robot overlords.

http://upload.wikimedia.org/wikipedia/commons/7/73/God2-Sistine_Chapel.png