Same namespace different assemblies. Assembly 1 (CoreAssembly.

Same namespace different assemblies Xml, it suggests first to have interfaces contained in their own assemblies with all relevant and required code held together and second and more importantly to re-use same namespaces across the overall application (or Jun 22, 2012 · I moved Class1 to Assembly2 and obsoleted Class1 in Assembly2 (Kept the same namespace and I can't remove it now to avoid a breaking change for my users). SqlServer. In c#, namespace has absolutely no relationship with accessibility modifiers. Only classes within the same assembly can access an internal type or member, unless you use the InternalsVisibleTo attribute. Multiple assemblies can contribute to a single namespace. Personal. Configuration & System. Net. Dec 15, 2010 · Using extern alias to bring the assemblies in with different namespaces. Type1 to create a local alias for the type. subnamespace1 Jun 24, 2016 · Now within the same solution of the application add the two new class library project. microsoft. Sep 10, 2015 · An assembly can contribute to multiple namespaces. cs (Namespace: Dep) DepTwo - MyType. My application was referencing two projects which both expose a specific type with equal name and equal namespace. Cecil, to allow two different versions of the same assembly to be referenced within an application. Commented Oct 11, 2013 at 15:11. the class Microsoft. (The framework doesn't see them as having the same names, because it sees the "fully qualified" name of everything - which has an alias and a namespace attached to the front of it. Thus types from each assembly can be referred to without ambiguity by using their fully qualified name, rooted in the appropriate namespace-alias. If you right-click on the Reference to your DLL and select Properties, you will see that here's a property called "Aliases" The default value is "global". An assembly can contain one or more namespaces and a namespace can span multiple assemblies. The fully qualified type names… Feb 9, 2010 · However, one thing is certain: maintaining multiple assemblies has drawbacks! This article is particularly good at describing those drawbacks, observing how they add costs at development time, compile time, deployment time, and runtime. cs. Jan 3, 2022 · I have a solution with multiple projects. g. Sep 20, 2012 · This now targets the exact reference you want, even if other references also provide a type with the same name and namespace. For two different implementations of the same concept he should be using an interface. Both assemblies use the same namespace SoftwareDrivers. If a using directive is placed outside a namespace declaration, that namespace's contents are loaded into the global namespace. Namespace doesn't Aug 1, 2013 · Each extern alias declaration introduces an additional root-level namespace that parallels (but does not lie within) the global namespace. Data. Rewrites . See related articles: extern alias (C# Reference):: operator (C# Reference) C# 2. cs Mar 10, 2021 · // whatever. Usually, the name of assembly is the same of a namespace that it contains but not always. Aug 7, 2018 · I have two different assemblies: Assembly1 and Assembly2. He shouldn't have two different classes with same name within same namespaces in different assemblies. ) Jul 16, 2024 · In this post I described a scenario where a project references a type from two different assemblies, but which have the same namespace and type name. There is a need that I have to refer to a different version of the same assembly in two different projects. For one of the conflicting assemblies change this to any other value. Moreover, skimming over the list of namespaces it holds like System. DLL) Contains namespaces Namespace1. You can end up with situations where the CLR tells you that Aug 16, 2010 · Have a separate library project for wrapping one of the two assemblies. When building the projects, one DLL is overwriting the other DLL, because they are both being…. So types are identified by their name, containing type, assembly, and generic arity. Now I get a compilation problem Class1 ambiguity when trying to use Class1 in my unit Nov 18, 2013 · At the same time, these 2 assemblies contain many different namespaces, so you can think the Assembly to Namespace relation as a Many-to-Many. Mar 10, 2021 · // whatever. NET assemblies with Mono. Fourth, and this is the weird one, the CLR considers types in assemblies loaded with Load different than types in the same assembly loaded with LoadFrom. In each class library assembly add one new class named – PatientDataContext. Server. That way you can choose a different name and namespace for one of them and then reference one of the two assemblies directly and the other indirectly. Feb 28, 2014 · You have two assemblies with the exact same name, same class types, same everything. The easiest approach is to do the following: Copy each respective assembly to its own folder. System. I18N and it is dedicated to localization services. Data, System. SqlContext). cs extern alias CustomNamespace // You can then make a distinction between the two assemblies // The one with extern alias on will be available through the specified namespace using CustomNamespace::whatevernamespace. cs DepOne - MyType. But keep in mind that both of these class are within same namespace. Oct 11, 2013 · Why are you declaring the same class name in the same namespace in two different assemblies? – Yván Ecarri. Bar<T> are different types. Mar 5, 2012 · If you want to use two types from different assemblies that have exactly the same name, including the namespace, your application won’t know which type to use. Common, System. the class System. dll assembly contributes to namespaces like System. And by "the same", we mean assemblies with the same simple assembly name . Feb 8, 2012 · This works when you reference two assemblies that share types with the exact same name and namespace. youwant // The other assembly which you didn't use the extern alias on will be available through the global namespace May 23, 2021 · I recently faced a challenge with a rather tricky situation. Data (e. C# loads the referenced assemblies into the global namespace alias by default, so it's impossible to tell them apart. For additional info on aliases, see this StackOverflow answer on What use is the Aliases property of assembly references. Aug 22, 2014 · Where they are placed affects how references are resolved. Feb 22, 2024 · Assemblies and Namespaces are related but serve different purposes in C# development. Aug 16, 2012 · And then added the namespace as using AliasName::Dapper; I added a post here: Ambiguous extension methods. Server (e. the top level namespace for all types within the assembly; assemblies in the order of dependencies first Note: The extension classes may have the same name FooExt as long as they are in different namespaces, of course you can also give them different names like FooExt1 and FooExt2 if you like - and the example will still work; even in older versions of C#. cs Sep 7, 2016 · Is it a bad practice? Is it better to use namespace that correspond with the file location? In my specific case, I have two assemblies: an Portable Class Library shared by some platforms and then a specific assembly for each platform (UWP, Desktop, ) The namespace is MyCompany. They are slightly different, because Java does not have assemblies; it has packages, which organize classes into namespaces. The global namespace is searched last. com Jun 24, 2016 · Now within the same solution of the application add the two new class library project. Now I have a unit test assembly, TestAssembly2 that references both assemblies Assembly1 and Assembly2. If, however, the using directive is placed within a namespace declaration, its contents are loaded into that namespace. Aug 14, 2018 · A namespace is just a way of adding a common prefix to all the types it contains, allowing you to have multiple types of the same name under different namespaces. See e. The challenge will be that if both assemblies have the same file name you cannot have them in the same folder during runtime. Other example of assemblies and namespaces. Bar and Foo. Assembly 1 (CoreAssembly. Uri (from the System assembly) and System. The code of both the class looks like this – ClassLibrary1 / PatientDataContext. DataTable) and Microsoft. It assumes that the assembly DLL name is the top level namespace and rewrites. Now, I have two implementations of a class that has identical functionality, just different implementation and dependencies that tie one implementation to Assembly1 and the other to Assembly2; I'll call this class PackageWriter. I this case the assemblies are called InTheHand. Attribute (from the mscorlib assembly) – May 24, 2016 · Sometimes, we get to a point where different parts of our application depend on different versions of the same DLL. Only difference? I my case one was compiled for desktop while the other was compiled for compact framework . For instance, the System. I use as few assemblies as possible, aiming for a single assembly while isolating volatile areas of the domain. youwant // The other assembly which you didn't use the extern alias on will be available through the global namespace Feb 3, 2014 · An assembly contains a collection of types (for example l'assembly System contains many namespaces included System, System. IO, ecc). If you can differenciate the namespace, you should be able to use using altType1 = someProduct. cs (Namespace: Dep) So now let’s try to @Jon Skeet: Your solution isn't the problem, but it's a clever "hack" for an architecture problem. Jan 14, 2016 · Foo. When you put a using directive at the beginning of a C# code file, you're telling the compiler "I want to use classes defined in this Namespace , no matter what assembly they come from" . The rough outline of this setup looked like this: CommandLine - Program. See full list on learn. In many cases, when there were no breaking changes between the versions, this situation doesn't pose a problem. 0: Using different versions of the same dll in one application May 19, 2016 · @AUsr19532 - you can use aliases, as Pikoh's answer indicates, if they have exactly the same types, but my point is, it's extremely common for assemblies to have (different) types in the same namespaces.