ExtensionMethod.NET is a database of C# 3.0 and Visual Basic 2008 extension methods. It contains many user-rated extension methods that will expand your code library immediately.

Over 100 Extension Methods

Extension methods add functionality to existing classes and allow you to expand the .NET framework. This way your favorite functions integrate seamlessly into the framework. For more information about extension methods visit the C# 3.0 and Visual Basic 2008 MSDN Library pages.

We invite you to submit your favorite extension methods and download and use others.

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TOP 3 Extension Methods

OrderBy(string sortExpression)  Submitted by C.F.Meijers on 2008/4/25 Orders a list based on a sortexpression. Useful in object databinding scenarios where the objectdatasource generates a dynamic sortexpression (example: "Name desc") that specifies the property of the object sort on.Language C# Type System.Collections.Generic.IEnumerable<T> Downloads 407
Encrypt & Decrypt  Submitted by Mark de Rover on 2008/1/02 Encrypt and decrypt a string using the RSACryptoServiceProvider.Language C# Type System.String Downloads 327
Pivot  Submitted by Fons Sonnemans on 2009/1/21 Groups the elements of a sequence according to a specified firstKey selector function and rotates the unique values from the secondKey selector function into multiple values in the output, and performs aggregations. Language C# Type System.Collections.Generic.IEnumerable<T> Downloads 288

Recently added

TimeElapsed  Submitted by jlafay on 2010/9/03 Inspiration for this extension method was another DateTime extension that determines difference in current time and a DateTime object. That one returned a string and it is more useful for my applications to have a TimeSpan reference instead. That is what I did with this extension method.Language C# Type System.DateTime Downloads 1
LengthOfTime  Submitted by Sanction10 on 2010/9/02 return the length of time between the start and current dateLanguage C# Type System.DateTime Downloads 0
GetPropertyValue  Submitted by Sanction10 on 2010/9/02 Gets the value of a property in a object through relectionLanguage C# Type System.Type Downloads 1