I am having an issue trying to figure out how to appropriately name my namespace. My namespace is currently:
<CompanyName>.<ProductName>.Configuration
However, using "Configuration" conflicts with:
System.Configuration
To make matters worse, I also have a class called ConfigurationManager. I know I could change it to something like:
<CompanyName>.<ProductName>.<ProductName>Configuration
but that seems redundant. Any ideas?
EDIT: Also, I'm aware when calling either class I can fully qualify the calling code but the frequency that the classes in the System.Configuration namespace and <CompanyName>.<ProductName>.Configuration namespace will be used would make for ugly code.
EDIT2: Providing specifics:
Using statements:
using System.Configuration;
using SummitConfiguration = SST.Summit.Configuration;
Problem Line
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.PerUserRoamingAndLocal);
Error Message
'SST.Summit.Configuration' is a 'namespace' but it is used like a 'type' (for problem line above)
Typically, in cases like this, I leave the Configuration namespace, and use an alias for accessing my namespace (instead of fully qualifying). For example:
using System.Configuration;
using PC = MyCompany.MyProduct.Configuration;
// ...
string configValue = PC.ConfigurationManager.GetValue("Foo");
What about doing something like this:
using System.Configuration;
using MyCompany.MyProduct.ProdConfig
or
using System.Configuration;
using MyCompany.MyProduct.Config
There shouldn't be a problem with using a namespace of Configuration - you'll just need to explicitly refer to the one you want by fully qualifying the name. It's a bit of a pain but I think a clear naming convention is better than coming up with a different name if the objects in your namespace really deal with configuration. As others have suggested, you can use aliases as well.
This may not work for you, but when I run into this, I just rename my namespace and/or class. Something like Config.ConfigManager.
Related
When upgrading project from 3.5 to 4.0 I encountered the collision of ISet class that exists in both
namespace:
System.Collections.Generic
Iesi.Collections.Generic
I have those two classes in hundreds of files. Prior to 4.0 there was not ISet in System.Collections.Generic.
How would you solve this pain ... ? Should I really add to each file: Iesi.Collections.Generic to ISet?
or give an alias:
using IesiGeneric = Iesi.Collections.Generic;
and use like that: IesiGeneric.ISet but all these means I have to change all those files ....
Is there another option?
UPDATE
What about creating interface like this:
using System;
using System.Linq;
using System.Text;
using Iesi.Collections.Generic;
namespace NameSpace
{
public interface IesiSet<T> : ISet<T>
{
}
}
and change Iesi Iset's to: IesiSet?
You should be able to add an alias directly to the type:
using ISet = Iesi.Collections.Generic.ISet;
Which should mean you ONLY need to update the head of each file.
However, going forward, I expect overtime (particularly as personnel changes) this is going to become a maintainability gotcha as people assume this is the built in ISet. I would take the pain now and replace globally now.
[also
I encountered the collision of ISet class that exists in both namespace
System.Collections.Generic.ISet is an interface. If your version is a class I would consider taking the pain of renaming it now, as it looks like an interface name]
I am creating a little Math library for myself contained within a single project and am running into some issues with namespaces. I have the project MyMathLib and the top level namespace:
namespace MyMathLib
{ ... }
and in a separate file...
namespace MyMathLib.Addition
{ ... }
and...
namespace MyMathLib.Subtraction
{ ... }
In the MyMathLib.Subtraction namespace I have a method that needs to use a static method SomeClass.Work() defined in MyMathLib.Addition so I included using MyMathLib.Addition at the beginning of the Subtraction file. But when I try to use the method it would like me to first qualify it with Addition.SomeClass.Work() and I want to be able to just type SomeClass.Work(). What am I doing wrong?
Thanks!
EDIT
Thanks for the suggestions! In each file, I actually named the class after the namespace (i.e. in the namespace MyMathLib.Addition is a static class Addition and in MyMathLib.Subtraction there is a static class Subtraction). Apparently this is what caused the issue (looking back, I should have stated this instead of using SomeClass). If I change the namespace to MyMathLib.MyAddition while keeping the static class as Addition, the using MyMathLib.MyAddition works as I want; that is, I can now just type Addition.Work() in my static Subtraction class. I've seen classes named the same as it's containing namespace before, could someone maybe explain why this is causing an issue? Shouldn't the compiler be able to determine whether I want to use the namespace or the class from the context of the code?
I'm guessing that you either have two classes called SomeClass that are both in namespaces you reference, or you have a variable or property named SomeClass. Either of these situations would make it impossible for the compiler to know that you're trying to call the static MyMathLib.Addition.SomeClass.Work() method, but the specific solution the compiler is suggesting makes it seem more likely to be the former.
Update
Seeing your edit, that makes sense. If you were using these in a namespace outside of MyMathLib, then you would still be able to avoid this namespace conflict. However, because you are inside the MyMathLib.Subtraction namespace, the compiler will implicitly consider any portion of the namespace "above" you to take precedence over class names. In this case, when you say "Addition", the compiler will look for the following items to resolve the name:
A class explicitly identified by a using ... = ... directive.
MyMathLib.Subtraction.Addition namespace.
MyMathLib.Addition namespace.
Addition namespace.
Any classes in the namespaces identified by using statements.
In this case, you're hitting #3 before #4, so you should be able to work around it either by renaming the class or namespace, or by using Yahia's suggestion (#1):
using Addition = MyMathLib.Addition.Addition;
Update 2
After looking at the article you linked to, it sounds like the explicit using statement still won't work. I guess item #1 actually gets evaluated down around item #4 instead. Bummer. You can use an alias to give the class a different name locally:
using Add = MyMathLib.Addition.Addition;
...
var add = new Add();
But the best solution is still probably just to avoid the namespace collision entirely by changing your namespace or class name.
try putting additionally the floowing line into your substraction source
using SomeClass = Addition.SomeClass;
http://msdn.microsoft.com/en-us/library/dfb3cx8s.aspx
http://www.blackwasp.co.uk/NamespaceAliasQualifier.aspx
Sounds like you're in the Subtraction namespace...add this to the top, inside the namespace declaration:
using Addition;
That should do the trick.
I have two Reason classes:
1. One that generated by the edmx file and inherited by the object context.
2. One that I created as POCO object.
While I write my queries I need to write the full namespace of the Reason POCO class:
using System.Collections.Generic;
using System.Linq;
using MyProj.Domain.Business.EntitiesRepository.System.Calls;
namespace MyProj.Data.EF4.EntitiesRepository.System.Calls
{
public class ReasonRepository:
EFRepository<MyProj.Domain.Business.Entities.System.Calls.Reason>, IReasonRepository
{
public IList<MyProj.Domain.Business.Entities.System.Calls.Reason> GetReasonsList()
{
return GetQuery().ToList();
}
}
}
If I am not writing the full namespace the compiler consider Reason as the generated object and not as the POCO object I need.
Is there any way of preventing write the full namespace?..
You could use using aliases .. see the example 1 in http://msdn.microsoft.com/en-us/library/sf0df423(v=vs.80).aspx.
How you do it -
in your using directive do something like -
using POCOObjects = MyProj.Domain.Business.Entities.System.Calls
after that you just need to type POCOObjects.Reason
Unless your Reason class is in the MyProj.Data.EF4.EntitiesRepository.System.Calls namespace, I think you can just add using MyProj.Domain.Business.Entities.System.Calls
Otherwise you might want to check out this Q&A C#: Problem trying to resolve a class when two namespaces are similar. The workaround being that you use the global:: namespace alias. More on that here: http://msdn.microsoft.com/en-us/library/c3ay4x3d.aspx
I'm working on an ASP.NET web application with .NET 3.5 and have run into the following problem:
I'm working with a class under the namespace X.Web.Controls.Core which references the class Utils in the namespace X.X2.components.util.
I get an error that Utils is already defined in the namespace X.Web.Controls.Utils
This should not be possible since I can't find anything referencing that namespace from the class I'm working on. Any ideas?
I can't really see that there should be a problem unless you have a using statement referencing it somewhere. Do take care that code in a namespace will implicitly "see" classes in the same namespace, even if they're defined elsewhere.
Anyways, you can solve your problem by changing the class name (for the current code file only):
using X2Utils = X.X2.components.util.Utils;
The class will be named X2Utils in your code. Alternatively you can make a shortcut for its namespace:
using X2util = X.X2.components.util;
Now you can refer to the class using X2util.Utils.
You're working in X.Web.Controls.Core which is a subnamespace of X.Web.Controls. That means the namespace Utils in X.Web.Controls is implicitly visible.
Solve using an alias as suggested by Blixt.
If I have a namespace like:
namespace MyApp.Providers
{
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Globalization;
}
Does this mean that if I create other files and classes with the same namespace, the using statements are shared, and I don't need to include them again?
If yes, isn't this a bit of a management headache?
No, it's only good for the namespace section inside the file. Not for all files inside the namespace.
If you put the using statement outside the namespace, then it applies to the entire file regardless of namespace.
It will also search the Usings inside the namespace first, before going to the outer scope.
You need to specify the using directive for any classes that you want to reference without qualification in each file where you want to use them.
Reference:
The scope of a using directive is
limited to the file in which it
appears.
No, it doesn't, and so no, it isn't.
Consider the fact that outside the namespace declaration, you are in the global namespace. Do using statements in that region of the source file affect the global namespace in other source files?
No. You'll need to include the namespaces in every class except on partial classes.
One side note: you're doing a very good practice of putting the using statements inside the Namespace. That's very good syntax.
Keep up the good work.
The using statements are valid for the code file in which they appear, with a minor twist; if you put the using statements inside the namespace, they are limited to the scope of that namespace, but still only within the same code file.
Usings only apply to the current file. Whether they're inside or outside the namespace declaration makes only a small difference:
The lookup order for types is as follows:
start in the innermost namespace declaration
look in the current namespace
look in the usings of the current namespace
go up to the parent namespace declaration and repeat from step 2
As a result, this program will compile fine:
namespace MyProject.Main {
using System;
class Program {
public static void Main(string[] args) {
Console.WriteLine("Hello, World!");
}
}
}
// in another file:
namespace MyProject.Console {
class Test {}
}
But if you move the using System; to the top, then the compilation will fail (MyProject.Console.WriteLine doesn't exist).