If I never ever use HashSet, should I still implement GetHashCode?

Posted by Dimitri C. on Stack Overflow See other posts from Stack Overflow or by Dimitri C.
Published on 2010-05-27T12:32:46Z Indexed on 2010/05/27 12:41 UTC
Read the original article Hit count: 169

Filed under:

c#

I never need to store objects in a hash table. The reason is twofold:

coming up with a good hash function is difficult and error prone.
an AVL tree is almost always fast enough, and it merely requires a strict order predicate, which is much easier to implement.

The Equals() operation on the other hand is a very frequently used function.

Therefore I wonder whether it is necessary to implement GetHashCode (which I never need) when implementing the Equals function (which I often need)?

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

Developer IT

If I never ever use HashSet, should I still implement GetHashCode? - Developer IT

If I never ever use HashSet, should I still implement GetHashCode?

c#

Related posts about c#

.NET WebRequest.PreAuthenticate not quite what it sounds like

HttpWebRequest and Ignoring SSL Certificate Errors

The dynamic Type in C# Simplifies COM Member Access from Visual FoxPro

Dynamic Type to do away with Reflection

Finding a Relative Path in .NET

Categories cloud