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This is a feature of C# 9.0. Similar to in scripting languages, top-level statements removes the ceremony of having to declare the Program class with a Main method. Instead, statements can be written directly in one specific file, and that file will be the entry point of the program. Code in other files will still have to be defined in classes.
A C# namespace provides the same level of code isolation as a Java package or a C++ namespace, with very similar rules and features to a package. Namespaces can be imported with the "using" syntax. Namespaces can be imported with the "using" syntax.
In Java (and Ada, C#, and others), namespaces/packages express semantic categories of code. For example, in C#, namespace System contains code provided by the system (the .NET Framework). How specific these categories are and how deep the hierarchies go differ from language to language.
When a .NET app runs, the just-in-time compiler (JIT) turns the CIL code into platform-specific machine code. To improve performance, .NET Framework also comes with the Native Image Generator (NGEN), which performs ahead-of-time compilation to machine code. This architecture provides language interoperability. Each language can use code written ...
But it can span over several namespaces. Also, one namespace can spread over several assemblies. In large designs, an assembly may consist of multiple files that are held together by a manifest (i.e. a table of contents). In C#, an assembly is the smallest deployment unit used, and is a component in .NET. In Java, it is a JAR file. [1]
X# lacks a namespace hierarchy, so the current namespace changes with each directive until the file ends. Variables or constants in different namespaces can have the same name, as the namespace is prefixed to the member's name in the assembly output. Namespaces cannot reference each other except through low-level operations.
C# has a static class syntax (not to be confused with static inner classes in Java), which restricts a class to only contain static methods. C# 3.0 introduces extension methods to allow users to statically add a method to a type (e.g., allowing foo.bar() where bar() can be an imported extension method working on the type of foo).
Oxygene does not use "Units" like Delphi does, but uses .NET namespaces to organize and group types. A namespace can span multiple files (and assemblies), but one file can only contain types of one namespace. This namespace is defined at the very top of the file: namespace ConsoleApplication1;