Some useful Extension Methods
Back to basics… A couple of useful Extension methods if you are checking if a string is a valid integer or decimal. public static bool IsInteger(this string value) { if (String.IsNullOrEmpty(value)) return false; Int32 tmpNo; return Int32.TryParse(value, out tmpNo); } public static bool IsDecimal(this string value) { if (String.IsNullOrEmpty(value)) return false; Decimal tmpNo; return Decimal.TryParse(value, [...]
OrderBy making null records come last Entity Framework and Linq
Ever want to sort your result set but make sure the records with a null sorting column appear last? See the example below var results = (from x in EntityObjectContext.MyTable select x into grp [...]
Finding StoreGeneratedPattern value in EdmProperty in T4 Template
If you need to find out if a primary key in your conceptual model which is using the Identity value from the property StoreGeneratedPattern, you can use the following code: (NOTE: This is used within a T4 template) string inputFile = @"..\EntitiesModel.edmx"; EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile); string annotationNamespace = "http://schemas.microsoft.com/ado/2009/02/edm/annotation"; foreach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e [...]
Disabling Request Validation with ASP.NET MVC
Sometimes when dealing with POSTS and form data, you need to disable Request Validation to allow HTML/scripting data into your methods. Traditionally with Web Forms you use <%@ Page ValidateRequest=”false” %> which turns off Request Validation, just be aware that this doesn’t work with ASP.NET MVC. You apply the [ValidateInput] attribute to the controller action [...]
Open XML – OLE Automation Date Issues
If you are exporting a date from C# to Excel using 2007, you probably will use the following: Math.Round(DateTime.Now.ToOADate(), 12).ToString() This exports the date as a OLE Automation date recognized by Excel 2007. How ever, in Excel 2010 this was causing issues, every time I exported to Excel 2010, it said that it has to [...]
EF Strongly Typed ObjectQuery.Include
The problem that I faced was having to put up with “hard coded” strings in the ObjectQuery.Include function to load related objects through POCO objects in the Entity Framework. This faced challenges when I renamed columns in the Model which caused a run-time error when recompiling and re-starting the application. Thanks to David Kiff, we [...]
Fixing the EF Tracing and Caching Provider Wrapper Issue
If you have been using the Tracing and Caching Provider Wrappers for the ADO.NET Entity Framework 4.0, you might of come across this error message when creating POCO objects, adding them to a Data Context and commiting them to the database using the Caching Wrapper: [NotImplementedException: The method or operation is not implemented.] EFCachingProvider.EFCachingDataReaderCacheWriter.GetName(Int32 ordinal) [...]
Random number of items from a Generic List extension method
Here is a code snippet for returning N number of items from a generic list using a extension method. This requires .NET 3.5. public static class Extensions { /// <summary> /// method for returning N number of random items from a generic list [...]
The custom tool ‘MSLinqToSQLGenerator’ failed. Unspecified error
I kept getting this error “The custom tool ‘MSLinqToSQLGenerator’ failed. Unspecified error. For me, this was caused when I was using partial classes and had several using statements at the top of the file: using System.Data.Linq; using System.Data.Linq.Mapping; using System.Data; using System.Collections.Generic; using System.Reflection; using System.Linq; using System.Linq.Expressions; using System.ComponentModel; using System; {namespace} {code} To [...]
Interview Questions Part 1
Over the past month, I have been interviewed by several companies and I thought I would share some of my experiences. Here are some of the questions I was asked (Technical): What is the difference between a reference type and a value type? What is the difference between a stack and a heap? What is [...]
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CodeLab Twitter- codelabnz: @bartekmarnane some info on micro orms http://t.co/UDfv5ML7 February 5, 2012
- codelabnz: @bartekmarnane depends on the project, but i found u have 2 be very careful with EF and the type of SQL it generates February 5, 2012
- codelabnz: @bartekmarnane I have been using EF for awhile, good for building apps quickly, but found it performs bad on higher traffic web applications February 5, 2012
- codelabnz: stuff it, I give up on Entity Framework, going to a micro ORM, back to writing SQL queries! I would rather do this than have a slow app! February 5, 2012
- codelabnz: Been too busy for tweeting lately January 21, 2012
- codelabnz: Blog Post: Setting the screen position when visiting previous page with jQuery http://t.co/evuKxVv0 January 17, 2012
- codelabnz: is anyone using Godaddy Cloud hosting? can someone provide their website so I could do a speed test? January 9, 2012
- codelabnz: Blog Post: Magento Fontis Paymate Module Fix for Not Passing Data Issue http://t.co/tgaDjmHv December 28, 2011
- codelabnz: first attempt upgrading magento from 1.4 to 1.6 fail. worst upgrade documentation. time to bring out the hack ninja December 27, 2011
- codelabnz: We would like to wish everyone a Merry Christmas and a Happy new year for 2012. Thank you all for your support... http://t.co/IGB5FlzO December 23, 2011