A large number of customers who are not UWP, .NET Core, and ASP.NET Core are currently using packages.config. Packages.config has several drawbacks, namely

• Solution level packages folder
• Flat dependency lists. Dependencies that are not directly referenced end up in packages.config making dependency management hard.
• Packages.config projects enable modification of Project files (reference data is duplicated) and makes clean uninstall almost impossible
• Finally, there is large security risk in enabling the execution of custom powershell scripts (Install.ps1) during packages install and unknown set of changes happening to your project.

Currently, converting from packages.config to nuget/project.json is a hard problem and a super manual process that could easily result in projects not building or running correctly. We want to help make it super easy for customers to move to the new awesome world of project/nuget.json. Our solution provides an upgrade mechanism in Visual Studio to help people move to the new NuGet 3.0 standard.

However, there are some open issues here that need to be thought through:-

• Transition to MSBuild projects: Dependencies in the neat future are going to be part of MSBuild projects. The tentative timeline for this is fall of this year. We need evaluate if there is additional burden for developers to move twice to the new format.

Every Visual Studio user not using NuGet Standard 3.0 is a potential customer. We want to get users to move away from the dependency management hell some of them are finding themselves in. Future investments will be primarily on top of NuGet Standard 3.0 and we want to bring all our customers in for a ride. Currently, users have to use either read blogs or this [doc] (https://github.com/NuGet/Home/wiki/Converting-a-csproj-from-package.config-to-project.json) to this themselves. Package authors and consumers both will be hugely benefit from this change.

During a number of customer calls and during the User Study, we have seen that customers are running into issues that can be essentially solved with project.json on a day to day basis.

While a solution level upgrade experience is desirable, we will start with project level upgrade first.

This feature will need to evolve over a period of time so we will introduce a new Experimental features option that will be by default turned off. Have a single Enable experimental features check-box in the General Page of NuGet Package Manager in Tools->Options.

Text: Enable experimental features

Info Icon: Not designed yet, we need to have a link that points to doc page that talks about experimental features

//TODO (Mockup)

Languages (If MSBuild based)

• C#
• VB
• C++/CLI
• F#? - Need to discuss with ML?
• C++? - No

Supported Frameworks

• All Versions (E.g 1.1.1, 2.0, 3.X. 4.X.) + PCL Profiles

Supported Projects

• WPF
• WinForms
• Console App
• Class Libraries
• PCLs
• Windows Service
• VS Extensibility
• Test
• Web (ASP.NET 4)
• Android
• iOS
• Office Projects
• VS Extensibility
• WCF
• Workflow
• Test

Blacklist(No new investments here)

• Windows 8.1 Store and Phone
• Silverlight
• Lightswitch

• Below Manage NuGet Packages in Project Context Menu and Top level menu.
• In the context menu for packages.config.
• In the Package Manager UI as a info bar that can be turned off.

Command Text: Upgrade to NuGet 3.4 Standard

Info Bar Text: Upgrade to NuGet 3.4 Standard

//TODO (Mockups)

• User clicks on the Upgrade Command
  • A dialog comes up explaining to the user the exact changes that will happen to the project
    • Icon: Information
    • Text:
    • Analysis Results
      • If there are any missing packages, we will not allow users to proceed (no OK button)
      • Show Results (issues that could happen if packages have content files, packages from install.ps1)
    • We need two options
      • Collapse dependencies (By Default)
      • Keep dependencies flat
    • Buttons: Cancel, OK
  • User clicks on Cancel - Dialog goes away
  • User clicks OK
    • We bring up the standard VS blocking UI progress bar (Like Restore). The following steps are documented in the dialog
  • Removal of packages.config
    • Adding of project.json
    • Adding top level packages
    • Restoring packages
  • Completion Dialog
    • Result: Upgrade Complete
    • Text: Please build and run your solution to verify that all packages are available
    • ** Text:** If you run into any issue and would like to revert, we have backed up changed files to _Location _. Follow the directions described in the following document to revert the changes.