Visual Studio was not giving autocomplete suggestions because in Unity, the external script editor (under Edit > Preferences > External Tools) was set to "open by file extension" and not "Visual Studio Community." But, switching to Visual Studio Community caused a whole host of seemingly random errors. In the bottom half one file, all references to variables declared in the class give "the name '[insert variable name]' does not exist in the current context," despite the fact that the same variables work perfectly fine in the upper half of the file. It gives a"} expected" error despite the fact that there are several closing brackets below. Plus, there are other errors which I don't understand: part of the error list. Switching back to "open by file extension" makes the errors go away, but then I can't use the autocomplete.

CodePudding user response：

Welcome to Stack overflow. That's interesting question. Have you checked This ??? Try steps that you might missed during installation. Also tick "embedded packages" checkbox

CodePudding user response：

It seems that retyping all the code got rid of the errors. Still no idea what caused it though.