问题
The easy part:
Targeting the .NET 2.0 framework in a Visual Studio 2010 project using the dropdown.
The hard part:
Is it possible to target a specific syntax version - for example var s = "hello world" is valid syntactic sugar in VS2008 and above, but would not compile in VS2005. Can VS2010 be configured to flag this at compile time?
回答1:
This can be done by specifying the language version in the project settings. To set the language version to C# 2.0 do the following
- Right Click on the project and select "Properties"
- Go to the "Build" Tab
- Click the "Advanced" Button
- Change the "Language Version" drop down to "ISO-2"
Here are the other selections and their meanings in Visual Studio 2010.
- ISO-1: C# 1.0 / Visual Studio RTM and 2003
- ISO-2: C# 2.0 / Visual Studio 2005
- C# 3.0: C# 3.0 / Visual Studio 2008
- default: C# 4.0 / Visual Studio 2010
回答2:
Yes. From the IDE, set:
Project Properties -> Build -> Advanced -> Language Version : ISO-2
回答3:
Yes, you can do this, as others have said - but it's not a perfect simulation of the C# 1 compiler, as I discovered while I was giving a presentation. It will spot "big" changes in syntax, but not some subtle changes in behaviour. For example, in C# 1 there's no method group conversion, so you couldn't do this:
delegate void Foo(string x);
void Bar(string y) {}
...
Foo foo = Bar;
... but simply setting the C# 4 compiler to target C# 1 doesn't pick this up.
来源：https://stackoverflow.com/questions/4994762/can-visual-studio-target-earlier-c-sharp-syntax-in-addition-to-earlier-net-fram