As of now, hot reload is not supported in Blazor, but it has been scheduled for the .NET 5 release. Please refer here for more information.
However, you can use the following command in the command prompt.
dotnet watch run debug
Also, you must include the following file types in the .csproj file for which files you want to watch.
<DotNetCliToolReference Include="Microsoft.DotNet.Watcher.Tools" Version="2.0.0" /> <ItemGroup> <Watch Include="..\**\*.razor" /> <Watch Include="..\**\*.scss" /> <Watch Include="..\**\*.cs" /> </ItemGroup>