根据安装的Net Framework版本运行不同的代码

Question

如果安装了Net Framework 3.5，是否可以使用普通LINQ运行LINQ方法，但如果安装了4.0或更高版本，则使用PLINQ？

Answer 1

I don't think that's possible. Here are some alternatives:

• If it is at all an option it would be much simpler to require your users to upgrade to .NET 4.0.
• If you can't require your users to upgrade you can spend a little more time improving the .NET 3.5 code so that you don't need to make a special .NET 4.0 version.
• Or you can make two different builds of your project using #if directives.

Answer 2

While i also don't think its wise to code two versions you can use the Environment.Version variable.

It is there in all .net versions since 1.1 and Silverlight.