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Is there any way to see the source code for methods that are implemented externally in the .NET framework?
I know about Reference Source which is a great resource, however a lot of the core classes in the .NET framework are implemented externally (I assume in C++?).
For example I am very interested in the internal workings of of the class String but almost half of the methods are declared with the extern keyword including this[int index] which appears to actually hold the characters in the string.
Where can I find the source code for String.this[int index] or String.nativeCompareOrdinalEx(String strA, int indexA, String strB, int indexB, int count) and other externally implemented methods?
Also, is there a particular reason why so much of the core framework classes are implemented externally? Is it so that they could utilize existing code or for performance reasons or something else?
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You can open code into Visual Studio in the following ways: On the Visual Studio menu bar, choose File > Open > Folder, and then browse to the code location. On the context (right-click) menu of a folder containing code, choose the Open in Visual Studio command.
You can use command-line compilers or Visual Studio to create a single-file assembly that targets the . NET Framework. By default, the compiler creates an assembly file with an .exe extension. Visual Studio for C# and Visual Basic can be used only to create single-file assemblies.
For the new, community, version you can dig in the github, that's where I found the implementation of decimal subtraction (or were I was pointed to by SO in fact)
CoreCLR / src
You have roslyn code there too:
Roslyn at Github
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