🔥 Edit Running Code Without Restarting
Change code while debugging. See results instantly. No stop. No rebuild. No restart. This is Hot Reload.
What Is Hot Reload?
Traditional workflow: Edit code → Stop debugger → Rebuild → Restart → Navigate back to same screen. 2-5 minutes lost per change.
Hot Reload workflow: Edit code → Save → Changes apply instantly. Zero downtime.
🎯 How to Use
- Start debugging (F5)
- Make code changes
- Click 🔥 Hot Reload button (or Ctrl+Alt+F5)
- Changes applied instantly
What You Can Change
✅ Supported Changes
- Method body logic
- Add new methods
- LINQ queries
- String changes
- UI updates (XAML, Razor)
- CSS styling
❌ Not Supported
- Add new classes
- Change method signatures
- Modify interfaces
- Generic type changes
- Add NuGet packages
Real-World Example
// You're debugging a web API
[HttpGet]
public IActionResult GetUsers()
{
var users = _db.Users.ToList();
return Ok(users);
}
// Realize you need filtering - just add it:
[HttpGet]
public IActionResult GetUsers()
{
var users = _db.Users
.Where(u => u.IsActive) // Added this line
.ToList();
return Ok(users);
}
// Hit Hot Reload → API instantly returns filtered results
// No restart, no re-navigation, no lost state
💡 Pro Tips
- Auto Hot Reload: Tools → Options → Hot Reload → Enable automatic on file save
- Verbose Logging: See exactly what changed in Output window
- Works with Docker: Edit code, hot reload applies to container instantly
- Blazor WebAssembly: Change C# or Razor, browser updates live
“Hot Reload saved me 3+ hours daily. I can iterate on UI 10x faster. Bug fixing during debugging is instant. This alone justifies upgrading to VS 2022.”
⚡ The Impact
80%
Less rebuild time
10x
Faster UI iterations
∞
Flow maintained