How to watch for file changes “dotnet watch” with Visual Studio ASP.NET Core

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If you want to use ASP.NET 2.x or 3.x you need to change it a bit.

  • The watch tool is a global tool now and you don’t need to add it as a reference any longer

  • The syntax is slightly different

    "Watch": {
  "executablePath": "dotnet.exe",
  "workingDirectory": "$(ProjectDir)",
  "commandLineArgs": "watch run",
  "launchBrowser": true,
  "launchUrl": "http://localhost:5000/",
  "environmentVariables": {
    "ASPNETCORE_ENVIRONMENT": "Development"
  }
}

For .Net 5 & 6

In VisualStudio 2019

  1. Go to Tools > ⚙ Options > Projects and Solutions > ASP .NET Core
  2. Select Auto build and refresh browser after saving changes in Auto build and refresh option
  3. Press Ctrl + F5 (Start Without Debugging) IMPORTANT: Only works if run without debbuging

Otherwise add this to your launchSettings.json:

{
  "iisSettings": {
    ...
  },
  "profiles": {
    ... ,

    "Watch": {
      "commandName": "Executable",
      "executablePath": "dotnet.exe",
      "workingDirectory": "$(ProjectDir)",
      "commandLineArgs": "watch run"
    }

  }
}

The automatically generated profile with "commandName":"Project" has all the other properties needed: launchBrowser, applicationUrl, environmentVariables, dotnetRunMessages and hotReloadProfile. Any modifications should be made there.

Corresponding Blog-Post from Juan Cruz Fiant: https://dev.to/juxant/auto-refresh-with-dotnet-watch-for-asp-net-core-projects-20no

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