CODEWITHSUNDEEP
c#.netvisual-studiovisual-studio-2015asp.net-core
James Ko
James Ko

Reputation: 34489

How to switch between target frameworks for .NET Core projects in Visual Studio

Say you have a .NET Core project that looks like this:

"frameworks": {
    "net40": {},
    "dotnet5.1": {}
}

And this is your C# code:

public class Foo
{
    public static void Blah()
    {
#if DOTNET5_1
        DoSomething();
#elif NET40
        DoSomethingElse();
#endif
    }
}

Now, in Visual Studio when you view the .cs file, one of the #if sections will be grayed out- either DoSomething or DoSomethingElse. Here's how it shows up on my laptop:

enter image description here

Is it possible to get VS to 'switch context' between target platforms, so you can view what would be compiled for a particular platform? For example, I might want to check for any red squiggly lines for each framework before actually building the solution.

Any help would be appreciated, thanks!

Upvotes: 29

Views: 21742

Answers (3)

superjos
superjos

Reputation: 12695

Answer already provided seems mostly correct. I'd just like to highlight some issues currently present with that.

As of today, on VS 2015 Community Ed, Version 14.0.25424.00 Update 3, global.json sdk 1.0.0-preview2-003121, the nav bar shows multiple targets only if the startup project is a multi-target "executable" one (e.g console app).

multi-target switcher visible

If startup is set on a multi-target class library, no target switch is listed (and the label next to the green arrow is different as well):

multi-target switcher not visible

Also, when switcher can be used, it seems like "standard" conditional defines provided by build system are not correctly highlighted in editor:

enter image description here

In order to see conditional define blocks correctly highlighted, one has to switch the project switcher, highlighted in green in last screenshot. It seems like different targets in same project are treated as different projects to this purpose. And that can be changed independently for any file open in editor.

Upvotes: 23

Luke Vo
Luke Vo

Reputation: 20638

I came to this question because I am working on MAUI project. To choose between targets, click on the triangle icon on the right of the Debug button, then Framework, then select the environment you want to work with.

enter image description here

There's also another pick below your tab bar:

enter image description here

Upvotes: 0

mstaessen
mstaessen

Reputation: 1317

At the top of your editor should be the navigation bar. Left in the navigation bar is a dropdown menu that lets you select the context.

If the navigation bar is hidden, you can enable it by going into Tools > Options > Text Editor > C# and check the navigation bar checkbox.

Upvotes: 42

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