如果我知道.NET 4.0安装在用户的机器上，我可以假设.NET 2.0也是如此吗？

Question

Pretty self-explanatory question, but here's a bit of context:

My app (C++, unmanaged) has a feature written as a C# app. This feature is only available when we know .NET is installed. So, must I maintain separate versions of this C# application for each framework version we want to support, or will a lowest-common-denominator of .NET 2.0 work (thus, if we detect any framework installed >= 2.0, we know we will be OK)?

Note that I prefer to just maintain a single .NET 2.0 version of our C# app.

Answer 1

You can assume that .net 2.0 apps will run on the 4.0 runtime.

See: http://msdn.microsoft.com/en-us/library/ff602939.aspx

Answer 2

是的，如果您针对.Net 2.0编写和构建应用程序，它将适用于所有版本。

Answer 3

The .NET framework dependencies page for .NET 4 on MSDN says that yes, you can count on it:

You do not have to install previous versions of the .NET Framework or the CLR before you install the latest version; each version provides the necessary components.

Answer 4

是的...（.net 2将在.net 4上运行）

Answer 5

I met a problem with mixed-mode assemblies like SharpSvn, which needed CLR v.2 to run, while my app was compiled for .NET 4, so we had to install both versions of the framework. Still I believe it's not your case.

Answer 6

是的，它确保了后兼容性，我用.net 3和3.5sp1做了这个，他们目前在.net 4上运行没有任何问题。