Visual Studio 2015中运行ASP.NET Core报错：无法启动调试及新建项目异常

Hey there, let's work through this issue together— I dealt with similar headaches when using VS2015 with .NET Core a while back, so here are the fixes that got me back up and running:

1. Confirm SDK Version Compatibility with VS2015 #

Visual Studio 2015 only supports .NET Core SDK versions up to 1.1.x— any SDK 2.0 or later won’t work with it. Here’s how to check and fix this:

• Open Command Prompt and run dotnet --version to see your current SDK version
• If it’s higher than 1.1.x, uninstall that SDK and install the matching .NET Core 1.1 version
• Also, double-check you have Visual Studio 2015 Update 3 installed— this is a non-negotiable prerequisite for running .NET Core projects in VS2015

2. Repair Visual Studio’s .NET Core Tooling Components #

Corrupted tooling often causes failures when creating or launching projects:

• Go to Windows "Programs and Features", find "Microsoft Visual Studio 2015", click "Change"
• Select "Modify", expand "Cross Platform Mobile Development", and ensure the "ASP.NET Core (including .NET Core)" option is checked
• Click "Update" to reinstall the relevant components

3. Fix the Project’s global.json SDK Version #

Existing projects might have a version mismatch in their configuration file:

• Navigate to your project’s root folder and open global.json
• Make sure the sdk.version value matches the .NET Core SDK you have installed, like this:

  {
    "sdk": {
      "version": "1.1.14"
    }
  }
  

• If there’s no global.json file, create one manually in the project root

4. Clear Cache and Rebuild the Project #

Corrupted cache files can break project launches:

• Close VS2015, delete the bin and obj folders from your project directory
• Reopen VS, reload the project, run "Clean Solution", then "Build Solution"
• Try launching the debugger again

5. Verify Debug Configuration Settings #

Incorrect debug settings can prevent the project from starting:

• Right-click your project → Properties → Debug
• Ensure the "Launch" option is set correctly (e.g., "Project" or your intended launch URL)
• Check that the ASPNETCORE_ENVIRONMENT environment variable is set to Development

If none of these steps resolve the issue, a full reinstall of VS2015 Update 3 + .NET Core 1.1 SDK (followed by a system restart) might be your best bet.

内容的提问来源于stack exchange，提问作者donprecious iyeritufu