Pointless .Net Feature of the Day
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I thought this too. What the hell use are partial methods. The only reasonable use I have found for them is when using Xamarin to build an app. You may have a class defined in both the iOS and Android projects and defining a partial class makes sense.
"There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult." - C.A.R. Hoare Home | LinkedIn | Google+ | Twitter
I'm not saying partial classes aren't reasonable (hell, I use partial classes), I'm saying partial METHODS aren't.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013 -
I'm not saying partial classes aren't reasonable (hell, I use partial classes), I'm saying partial METHODS aren't.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013I can't think of a single use for a partial method either.
"There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult." - C.A.R. Hoare Home | LinkedIn | Google+ | Twitter
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Partial methods. I'll let you do your own research, but I cannot identify a single case where the use of a partial method would be beneficial, desired, or warranted.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013I do not agree. We have a number of WCF/SOAP projects where we generate code from wsdl and same thing with XML generating code from XSD. I both cases it is beneficial to have additional methods or properties in a separate file. When XSD or WSDL is updated you code is not overwritten during regeneration.
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Sander Rossel wrote:
It was heavily used in Entity Framework DB First.
Ah. That explains it. They made a language enhancement to support a bad design to begin with! ;)
Latest Article - A Concise Overview of Threads Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
Marc Clifton wrote:
They made a language enhancement to support a bad design to begin with!
That's truth in advertising right there... :)
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013 -
I do not agree. We have a number of WCF/SOAP projects where we generate code from wsdl and same thing with XML generating code from XSD. I both cases it is beneficial to have additional methods or properties in a separate file. When XSD or WSDL is updated you code is not overwritten during regeneration.
Once again, this discussion isn't about partial classes - it's about partial METHODS.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013 -
Partial methods. I'll let you do your own research, but I cannot identify a single case where the use of a partial method would be beneficial, desired, or warranted.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013No Research needed. It's for extending generated Code that may will be re-generated later (so you can not change it because your changes would be overriden). E.g. I use it to extend EF generated Contexts. It's a very nice feature and .NET has many not everyone will use, so don't. But if you do Frameworks or template-code or big systems (or WindowsForms UI) it's very handy…
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Where is YAGNI when you need it. Google trends[^] results sort of agree with your feelings, as do I.
Definitely YAGNI. Will definitely be asked about it in a job interview.
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The cool thing in the code below is that if you don't define LOGGING, not only does the partial method go away, but any calls to the method are also removed.
#define LOGGING
using System;
namespace PartialMethodTest
{
partial class Foo
{
partial void Log(string msg);public void DoSomething() { Log("Fizbin"); } }#if LOGGING
partial class Foo
{
partial void Log(string msg)
{
Console.WriteLine(msg);
}
}
#endifclass Program { static void Main(string\[\] args) { new Foo().DoSomething(); } }}
Latest Article - A Concise Overview of Threads Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802
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No Research needed. It's for extending generated Code that may will be re-generated later (so you can not change it because your changes would be overriden). E.g. I use it to extend EF generated Contexts. It's a very nice feature and .NET has many not everyone will use, so don't. But if you do Frameworks or template-code or big systems (or WindowsForms UI) it's very handy…
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It's for use in a
partial class, so you could declare the partial method in the designer code for a WinForms app for example, and implement it in the user defined code for the same class. The difference is that the method can be called from the designer code because it will compile cleanly. This is still the case if the implementation of the partial method is never provided: the compiler will remove the partial method and the call to it if the concrete version is not written, and you still won't get a compiler error. Think of it as a sort-of optional private abstract method and you're about there.Sent from my Amstrad PC 1640 Never throw anything away, Griff Bad command or file name. Bad, bad command! Sit! Stay! Staaaay... AntiTwitter: @DalekDave is now a follower!
I use it frequently. I find it simpler to use than Interface.
__________________ Lord, grant me the serenity to accept that there are some things I just can’t keep up with, the determination to keep up with the things I must keep up with, and the wisdom to find a good RSS feed from someone who keeps up with what I’d like to, but just don’t have the damn bandwidth to handle right now. © 2009, Rex Hammock
