I'm using StyleCop and FxCop tools to improve my code but I came to a place where there are two rules, one in StyleCop and one in FxCop that exclude each other. If I fix my code to match the rule from StyleCop then FxCop validation fails and vice versa.
First rule is SA1200 from StyleCop which says that all using directives must be placed inside of the namespace.
All using directives must be placed inside of the namespace.
So I have done something like this
namespace MyNamespace
{
using System;
...
}
It was ok for StyleCop, no more warnings. Now I run FxCop validation and it tells me that CA1014 is violated:
Mark 'MyApp.dll' with CLSCompliant(true) because it exposes externally visible types.
To resolve this I should do something like this:
[ClsCompliant(true)]
namespace MyNamespace
{
...
}
but now I cannot build my project because ClsCompliant attribute is not recognized (because it's from System namespace which I include inside of the MyNamespace). So if I move using System; directive outside of MyNamespace declaration. This will make my code compile but again it will break the rule from StyleCop.
Is there any way to deal with this problem except for disabling one of the rules in StyleCop or FxCop? And if that's not possible which of the rules should I disable? Which is less important?
Use full attribute name:
[System.CLSCompliant(true)]
namespace MyNamespace
{
...
}
BTW: if you want to mark your whole assembly as CLSCompliant, put
[assembly: System.CLSCompliant(true)]
in Properties/AssemblyInfo.cs file
My suggestion is to turn off the "All using directives must be placed inside of the namespace." rule in StyleCop. It's impractical to adhere to it, especially since most of the code generators (even VS own ones) do not follow this practice.
Related
I needed to add a new reference to my code, so I added Azure.Messaging.ServiceBus via the nuget package manager. That installation went through successfully, and I can see that in the references for my package.
However, when I attempt to add using Azure.Messaging.ServiceBus to a given file, it cannot find it, from what I can tell because there are other references to Microsoft.Azure.X, and the Azure namespace is routed to the Microsoft.Azure namespace.
I was able to temporarily escape that issue by adding the reference outside of the namespace in the following way:
#pragma warning disable SA1200 // Using directives must be placed correctly
//using Azure.Messaging.ServiceBus;
#pragma warning restore SA1200 // Using directives must be placed correctly
namespace X.Y.Z
{
using System;
...
using Microsoft.Azure.ResourceProvider.Common.Exceptions;
...
However, this is somewhat of a pain because I then have to add this to many classes and also it is preventing me from doing things like using the fully qualified object name for Azure.Messaging.ServiceBus.ServiceBusMessage to not conflict with another class that is already named ServiceBusMessage within my solution.
Is there something I can do to have Azure.Messaging.ServiceBus be treated like any other import and not have it conflict with existing references?
Using statements are to help readability, not really for performance.
Suppose the kind of using directive in the Headers section (using statements section), is to bring a namespace into scope where as the fully qualified namespace (Eg: System.Text.StringBuilder) - this kind of statement is for correctly using (creating and disposing) an object implementing the IDisposable interface.
The <fully-qualifed-type-name> is the name of the type whose static members and nested types can be referenced without specifying a type name. If you don't provide a fully qualified type name, C# generates compiler error CS0246 as referenced from this MSFT Doc.
And As Panagiotis Kanavos suggested that, another option is to use two or more files to separate the classes/methods which needs access to each namespace.
Glad Nimish Todi, that you are trying to,
Resolve the issue by refactoring out the code to make the classes do only their own functionalities instead of making changes many at this time where aliasing of the import does helps to.
I installed StyleCop and the associated plugin for ReSharper 5. After getting annoyed with it I removed both the plugin and StyleCop, but ReSharper is still using some of the StyleCop behaviour - most notably moving using statements to within the namespace declaration, rather than keeping them outside the declaration.
For instance say you have the following source:
using System;
using System.Web;
namespace Foo.Bar
{
////
}
And the file sits within The Foo/Bar/Widget directory, using ReSharper's fix namespace tool I would expect the file to stay the same, but the namespace to have changed to Foo.Bar.Widgets (this is the behaviour it exhibited before StyleCop came along).
Now however it rearranges the file:
namespace Foo.Bar.Widget
{
using System;
using System.Web;
////
}
Now putting aside people's personal preferences about which one is better, I don't like it, and it is inconsistent with our existing code. Having to manually move using statements after renaming the namespace takes long than renaming the namespace manually.
Does anyone know how to correct this (I'm assuming there is a file or something still lingering around from the install, or a config that hasn't been reverted).
You can change it here:
ReSharper -> Options -> Languages -> C# -> Namespace Imports -> Add using directive to the deepest scope
UPDATE - Resharper 9 This option is now moved to:
ReSharper -> Options -> Code Editing -> C# -> Code Style -> Reference qualification
I just had the same issue. It turns out that the StyleCop settings are stored in the "This computer" layer of ReSharper settings. See ReSharper > Manage Options for a list of layers.
I just had to reset the "This computer" layer; this was possible since I had never intentionally modified it.
Microsoft StyleCop provided a warning when the using directives for namespaces are provided outside of the namespace. Is this really required as my view on this is that using dircetives for namespaces is for providing a alias name for namespace and for removing the need for providing the namespace name when a class/interface is used. I dont think it will be used for loading the assembly.
It's basically your choice. But as we follow Microsoft and this is their standard it's good to have your all usings inside your name space. And also have them sorted.
Ok, I guess do namespaces have to be the same as the nested folders that their in? I keep getting errors saying that the namespace should be xxx.yyy.zzz.
Example:
Folder1
Folder2
MyControl.cs
I have a namespace in it defined as:
namespace CustomControls
{
...
}
so the compiler is complaning that it must be namespace Folder1.Folder2
so is there a direct relation to file structure and namespaces? Are you forced to have a tight relation to these?
This is a warning Resharper usually reports. To exclude a folder from Resharper's folder tree - namespace comparison, go to the folder properties list in VS and set Namespace Provider to false.
I don't know whether ASP.NET has some special rules (due to automatic compilation) but certainly in C# itself there are no rules saying you have to organise your folders to match your namespaces. It's a good idea from a maintainability point of view though.
Are you sure it's the compiler and not just another bit of ASP.NET (or even ReSharper?) complaining?
No. You can have any namespace tree you want regardless of your folder structure. Visual Studio makes it easy on you to automatically create namespaces based on folder structure so you don't have to maintain namespace trees yourself. But does not force it in any ways shape or form.
The error you're getting doesn't have anything to do with your compiler.
You also don't have any tag saying what Dev IDE you're using.
That has to be an error coming from ReSharper and not from Visual Studio's compiler. Right now I am actually having the opposite problem: I am trying to get VS2008 to automatically name my namespaces based on my nested folder structure like Folder1.Folder2.MyProjectName but it insists on naming it "flat" MyProjectName! So as Jon said, C# in itself is agnostic to namespace nomenclature.
Is there a way to reference a namespace globally across the whole solution?
So instead of having these lines in every code file:
using System;
using MyNamespace;
having to declare them only once, and every code file would use them.
Btw I am using Visual Studio.
No, C# doesn't have this concept. Each source file is independent in this respect. (And if the using directives are in a namespace declaration, those are independent from other using directives in peer namespace declarations, too. That's a pretty rare case though in my experience.)
You don't need ReSharper to change what gets included in a new class though. You can use the Visual Studio templates.
EDIT: Just to clarify the point about using directives within namespaces, suppose we had (all in one file):
using Foo;
namespace X
{
using Bar;
// Foo and Bar are searched for code in here, but not Baz
}
namespace Y
{
using Baz;
// Foo and Baz are searched for code in here, but not Bar
}
Usually I only have one namespace declaration in a file, and put all the using directives before it.
No, this is not possible.
If you're using ReSharper, you can set an option to include specific using directives in every new file you create though.
From this SO question and follow-up blog post. You can edit the Visual Studio default templates.
To do this, look at the file in this zip : [Program Files][Visual Studio]\Common7\IDE\ItemTemplates\CSharp\Code\1033\Class.zip
and modify the Class.cs file as needed. Additionally, Visual Studio may have cached this file here :
[Program Files][Visual Studio]\Common7\IDE\ItemTemplatesCache\CSharp\Code\1033\Class.zip
In C# 10.0 you can use Global Usings.
global using System;
global using MyNamespace;
No, you can not reference a namespace globally across the whole solution in .NET or .NET CORE.
But you can use project wise namespace globally in solution. this feature will be available from c#10/.NET 6. currently it's in preview but it will be released in NOV 2021
=========Project level .NET 6 global using namespace=========
Create a class file at root of the project e.g GlobalNamespace.cs
global using System;
global using System.Linq;
global using System.Text.RegularExpressions;
global using System.Threading.Tasks;
Then you don't need to declare using namespace in other .cs files of the project which are already declared globally.
As others have mentioned Visual Studio Templates are the way to go.
Note that simply adding a using statement to your template will not ensure that the compiler can resolve your types. So, if you are adding a using statement for MyNamespace in every class you may need to add an assembly reference to your project as well. See the C# FAQ for more information.
One trick I miss as a newb to CSharp is to look at the "refences" (in VS), to right click and "Add New Reference". This is especially handy when combining mulitple projects where I have made some generic class for reuse elsewhere.