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5 Απρ 2016 · The ExtensionAttribute class is shipped in System.Core.dll (.NET 3.5), but you can re-declare it yourself if you want to use extension methods in .NET 2.0/3.0 (with C# 3.0, obviously). In fact, LINQBridge does this.
The workaround is to use your Extension Method class as just a Facade to a regular class, and all the static methods in your Extension class just call the real class, probably using a Singleton.
15 Μαρ 2024 · Extension methods in C# enable you to add methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type.
25 Απρ 2024 · The using directive allows you to use types defined in a namespace without specifying the fully qualified namespace of that type. In its basic form, the using directive imports all the types from a single namespace, as shown in the following example: C#. Copy.
GetExtension (ReadOnlySpan<Char>) Returns the extension of a file path that is represented by a read-only character span. GetExtension (String) Returns the extension (including the period ".") of the specified path string.
C# doesn't use #include. All of the classes in all of the files are automatically available everywhere. If a class is created inside the same project namespace then it can be used everywhere. If it's in a different namespace you 'include' it with the "using" keyword.
I closed all files and restarted VS only to find out that some files disappeared from the Solution Explorer. The following solved my problem: by selecting the current project in the Solution Explorer, a little icon Show all files appears on the top bar. Right-clicking the file and selecting Include In Project does the thing. Credit
