Linq Where Clauses - Better to stack or combine?

Posted by burnt_hand on Stack Overflow See other posts from Stack Overflow or by burnt_hand
Published on 2010-03-24T08:42:24Z Indexed on 2010/03/24 8:43 UTC
Read the original article Hit count: 415

Filed under:

linq-to-objects

|

c#

When writing a method chain for LINQ, I can do the Where statements one of two ways:

var blackOldCats = cats.Where(cat => cat.Age > 7 && cat.Colour == "noir" )

Or

var blackOldCats = cats.Where(cat => cat.Age > 7).Where(cat.Colour == "noir" )

Are there any benefits of one over the other?

Don't worry too much about the datatypes in this example, but if there are issues with datatypes, then that would be good to know too.

© Stack Overflow or respective owner

Related posts about linq-to-objects

Linq To Objects Auto Increment Number

as seen on Stack Overflow - Search for 'Stack Overflow'
This feels like a completely basic question, but, for the life of me, I can't seem to work out an elegant solution. Basically, I am doing a Linq Query creating a new object from the query. In the new object, I want to generate a auto-incremented number to allow me to keep a selection order for… >>> More
When is LINQ (to objects) Overused?

as seen on Stack Overflow - Search for 'Stack Overflow'
My career started as a hard-core functional-paradigm developer (LISP), and now I'm a hard-care .net/C# developer. Of course I'm enamored with LINQ. However, I also believe in (1) using the right tool for the job and (2) preserving the KISS principle: of the 60+ engineers I work with, perhaps only… >>> More
LinQ to objects GroupBy() by object and Sum() by amount

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I have pretty simple case which I started solving using foreach(), but then I thought I could do It using Linq Basically I have IList that contains PaymentTransaction objects and there are 2 properties Dealer and Amount I want to GroupBy() by Dealer and Sum() bv amount. I tried to accomplish… >>> More
Linq-To-Objects group by

as seen on Stack Overflow - Search for 'Stack Overflow'
Hey, I'm building a software for timereporting I have a Dictionary<string, Dictionary<string, double>>. The key in the main dictionary is a users name and their value is a dictionary of . I have a function GetDepartment(string UserName) which returns a string with the users department… >>> More
Switching from LinqToXYZ to LinqToObjects

as seen on Stack Overflow - Search for 'Stack Overflow'
In answering this question, it got me thinking... I often use this pattern: collectionofsomestuff //here it's LinqToEntities .Select(something=>new{something.Name,something.SomeGuid}) .ToArray() //From here on it's LinqToObjects .Select(s=>new SelectListItem() { … >>> More

Related posts about c#

.NET WebRequest.PreAuthenticate not quite what it sounds like

as seen on West-Wind - Search for 'West-Wind'
I’ve run into the problem a few times now: How to pre-authenticate .NET WebRequest calls doing an HTTP call to the server – essentially send authentication credentials on the very first request instead of waiting for a server challenge first? At first glance this sound like it should be easy:… >>> More
HttpWebRequest and Ignoring SSL Certificate Errors

as seen on West-Wind - Search for 'West-Wind'
Man I can't believe this. I'm still mucking around with OFX servers and it drives me absolutely crazy how some these servers are just so unbelievably misconfigured. I've recently hit three different 3 major brokerages which fail HTTP validation with bad or corrupt certificates at least according to… >>> More
The dynamic Type in C# Simplifies COM Member Access from Visual FoxPro

as seen on West-Wind - Search for 'West-Wind'
I’ve written quite a bit about Visual FoxPro interoperating with .NET in the past both for ASP.NET interacting with Visual FoxPro COM objects as well as Visual FoxPro calling into .NET code via COM Interop. COM Interop with Visual FoxPro has a number of problems but one of them at least got a lot… >>> More
Dynamic Type to do away with Reflection

as seen on West-Wind - Search for 'West-Wind'
The dynamic type in C# 4.0 is a welcome addition to the language. One thing I’ve been doing a lot with it is to remove explicit Reflection code that’s often necessary when you ‘dynamically’ need to walk and object hierarchy. In the past I’ve had a number of ReflectionUtils that used string based expressions… >>> More
Finding a Relative Path in .NET

as seen on West-Wind - Search for 'West-Wind'
Here’s a nice and simple path utility that I’ve needed in a number of applications: I need to find a relative path based on a base path. So if I’m working in a folder called c:\temp\templates\ and I want to find a relative path for c:\temp\templates\subdir\test.txt I want to receive back subdir\test… >>> More