nuget.exe should show a helpful message when nuget.config is corrupt

[emgarten]

An invalid nuget.config will cause a generic exception and error message.

Steps

1. Create a new UWP app
2. Copy .vs\config\applicationhost.config to nuget.config or create a corrupted nuget.config file
3. From the solution folder run: nuget.exe restore -configfile nuget.config -packagesdirectory packages

Expected:
An error message referring to nuget.config

Actual:

Restoring packages for <mypath>\Projects\App13\App13\project.json...
Unable to resolve Microsoft.NETCore.UniversalWindowsPlatform (≥ 5.0.0) for UAP,Version=v10.0.
Exception of type 'NuGet.CommandLineException' was thrown.

[csharpfritz]

Similarly, ensure that a friendly and detailed error message is shown for corruption of
project.json files as well.

On Mon, Aug 31, 2015 at 2:52 PM, Justin Emgarten notifications@github.com
wrote:

An invalid nuget.config will cause a generic exception and error message.

Steps

1. Create a new UWP app
2. Copy .vs\config\applicationhost.config to nuget.config or create a
   corrupted nuget.config file
3. From the solution folder run: nuget.exe restore -configfile
   nuget.config -packagesdirectory packages

Expected:
An error message referring to nuget.config

Actual:

Restoring packages for \Projects\App13\App13\project.json...
Unable to resolve Microsoft.NETCore.UniversalWindowsPlatform (≥ 5.0.0) for UAP,Version=v10.0.
Exception of type 'NuGet.CommandLineException' was thrown.

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#1302.

[emgarten]

@deepakaravindr was this fixed in your change?

[deepakaravindr]

Yes, this will get fixed by the PR: NuGet/NuGet.Client#103 as well

[yishaigalatzer]

The message should show what file is introducing the bad xml.

Duplicate bug: #834

[yishaigalatzer]

Summary: Any invalid config file that should be picked up, but fails to load should be turned into an error message that shows both in the UI and commandline. The error should be meaningful and point to the filename/file path and location in the file

[yishaigalatzer]

#1567