In this series of Demystifying C# 3.0 we have already covered -
a) Demystifying C# 3.0 - Part 1: Implicitly Typed Local Variables "var"
b) Demystifying C# 3.0 - Part 2: Anonymous Types
c) Demystifying C# 3.0 - Part 3: Extension Methods
d) Demystifying C# 3.0 - Part 4: Lambda Expressions
e) Demystifying C# 3.0 - Part 5: Object and Collection Initializers
f) Demystifying C# 3.0 - Part 6: (LINQ) Query Expression Translation (to C# 3.0)
Thank you to both Eric Wise, and C. Steen for linking. The more people we have look at these posts, the better the overall discussion quality will be.
Okay, so next we will be talking about "Expression Trees". You must read about Lambda Expressions before you read this post.
So in short, Expression trees permit lambda expressions to be represented as data structures, instead of executable code. What that means is, a lambda expression such as
x => x + 1, is executable code. which could also be written as,
Func<int,int> f = x => x + 1
But,
Expression<Func<int,int>> e = x => x + 1 ;
In other words, if a lambda expression can convert to a Delegate type "D", it can also convert to an expression tree of type System.Query.Expression<D>.
".. if a lambda expression can convert to a Delegate type "D", it can also convert to an expression tree of type System.Query.Expression<D>.. " <-- That fills out that little blurb I left out when discussing Lambda Expressions.
This covers the basics of C# 3.0. Next we will be continuing this talk, with a continued discussion on LINQ.
On
3/9/2009 9:17:26 AM
Andy
said ..
Really? You honestly think that this "demystifies" Expression Trees?
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On
6/5/2009 11:19:44 AM
Erik
said ..
What the other guy said...
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On
8/13/2009 11:21:36 AM
decius
said ..
Agreed. This is quite dry and falls short of demystificationism
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On
11/10/2009 6:45:56 AM
ex-lisper
said ..
Wow, short and sweet... which is a shame, as your other articles were fantastic.
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On
11/10/2009 3:27:17 PM
Sahil Malik
said ..
Yeah I need to write this article better. I'll get around to it one day!
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On
12/17/2009 5:19:53 AM
anon
said ..
u lazy bum :) it's been 3 years already. write it better now!
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