visual studio 2015 update 2 RTM and RC debugging context not available

问题

Update 1:

After Updating visual studio to version 2015 update 2 RTM the problem still exist.

Update 2 patch available 4/12/2016 :

Thanks to Patrick Nelson.

a patch has been released

You can download the patch here.

Update 3 8/16/2016:

Latest vs 2015 update 3 KB3165756 has the same problem do not update

Version Used:

Latest stable version on visual studio update 2 rc

Disabled all my extensions and also restarted my all settings

Steps to Reproduce:

1. Install visual studio update 2 rc
2. Create new project using asp.net mvc core template
3. Debug the app

Expected Behavior:

To be able to debug the asp.net application

Actual Behaviour:

I can't explore context of variable inside visual studio editor or immediate windows i get the following error in immediate windows

error CS0103: The name 'myvariable' does not exist in the current context

回答1:

This is a bug that was introduced in Visual Studio 2015 Update 2. Essentially the debugger is unable to inspect local variables in dynamic modules. We released a hotfix for it today.

You can download the patch here. Documentation for the patch is here. Let me know if the patch does not fix your particular scenario.

回答2:

using trial and error method i found a workaround for know that will bring back context debugging.

from tools >  options > debugging > general then enable

回答3:

and also (Use Managed Compatibility Mode - Enabled) please make sure json configuration file has this sections

"frameworks": {
    "dnx451": { }, 
    "dnxcore50": { }
},

回答4:

I found a solution for visual studio 2015 update 3, 14.0.25420.01 I just removed "debugType": "portable" from project.json Now it works for me.

回答5:

For Visual Studio Update 3 I reset my Visual C# settings and it worked.

来源：https://stackoverflow.com/questions/36284093/visual-studio-2015-update-2-rtm-and-rc-debugging-context-not-available