.net3.5和.net4.0项目之间的共享源文件

Question

I have the same file that i want to compile in a .net 3.5 project and a 4.0 project.

The api has changed the between the versions of .net, for example I have the following line of code which shows a splash screen on startup:

.net 4.0: splash.Show(false, true);
.net 3.5: splash.Show(true);

How can i use the same source file in both projects?

Answer 1

Create aa conditional compilation symbol in the properties page of your project that encloses the problematic file, for example

NET40

then, in code write

#if NET40 
    splash.Show(false, true);
#else
    splash.Show(true);
#endif

You could also create two different Configuration Settings with the Configuration Manager . In the first one you don't have the NET40 defined and you could call it CompileFor35 while in the other one you define the compilation symbol and call it CompileFor40 .

At this point, to switch from one version to the other one, you could simply recall the appropriate configuration setting from the menu BUILD->Configuration Manager

You could read about the steps required in a bit more detail in this answer