Code, rants and ramblings of a programmer.
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Dictionary<TKey,TValue>.TryGetValue and Anonymous Types
One of the methods I find to be the most useful in .Net is the method Dictionary<TKey,TValue>.TryGetValue . This method is a nice compromise between performance, explicit return vs. exception, and a being verbal about the chance of failure. It returns false on failure and uses an out...
23 Mar 2010
Making F# type inference friendly for C#
One of my current hobby projects, VsVim , requires me to make a lot of calls between F# and C# projects. The core Vim engine is a pure F# solution based on Visual Studio’s new editor. It additionally has a small hosting layer and a large test bed both written in C#. When working with...
15 Dec 2009
Using F# Discriminated Unions in C# (Beta2)
While updating my VsVim editor extensions for Beta2  I got hit by a change in the way F# exposed discriminated unions in metadata. My extension consists of a core F# component with a corresponding set of unit tests written in C#. It’s mostly API level testing and as such I use a lot of...
27 Oct 2009
When to use Type Inference
Occasionally the debate will come as to when it's OK to use type inference in order to declare a variable. There appear to be three groups in this debate. Whenever it's possible Only when it's absolutely clear what the type is Never, type inference is evil I fall into camp #1 and here are my reasons...
9 Sep 2008
Switching on Types
One action I find frustrating in C# is where a particular action needs to be taken based off of the type of a particular object. Ideally I would like to solve this with a switch statement but switch statements only support constant expressions in C# so no luck there. Previously I've had to resort to...
16 May 2008
Design Guidelines: Provide type inference friendly Create function for generic objects
Really this guideline is a bit longer but putting it all in a blog title seemed a bit too much. The full guideline should read: "If a generic class constructor arguments contain types of all generic parameters, provide a static method named Create on a static class of the same class name as...
11 Apr 2008
Tuples Part 3: Type Inference Friendly Constructor
Last time we were left with a constructor that required us to explicitly specify generic parameters. This is not always easy or possible. We'll now alter the script to generate a constructor which utilizes type inference to create a Tuple. In addition, all tuples will use the same overloaded method making...
7 Jan 2008
C# Lambda Type Inference
One of the limitations of C# type inference is that you cannot use it to infer the type of a lambda expression. For example, the following code will not compile var f = () => 4; Normally this is not too much of an issue because you can just explicitly declare the type of the lambda expression...
14 Dec 2007
Type Inference and IEnumerable
This is somewhat of a follow up on a previous post I did on the difference between IEnumerable(Of T) and the IEnumerable interfaces. I've seen several people type in the following code and wonder if there was a fundamental bug in the type inference code. Private Sub Form1_Load( ByVal sender As System...
26 Nov 2007
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