Creating new blazor application throws an error when run

Question

I am following Get started with Blazor. I have created the application and attempt to run it as is i have made no changes.

There are three things in my event log.

The directory specified for caching compressed content C:\inetpub\temp\IIS Temporary Compressed Files\Clr4IntegratedAppPool is invalid. Static compression is being disabled.
Application 'MACHINE/WEBROOT/APPHOST/WEBAPPLICATION1' with physical root 'C:\Users\LindaL\source\repos\Daimto.RazorTest.Tools\WebApplication1\' failed to start process with commandline 'c:\program files (x86)\microsoft visual studio\2017\professional\common7\ide\extensions\microsoft\web tools\projectsystem\VSIISExeLauncher.exe -argFile "C:\Users\LindaL\AppData\Local\Temp\tmpF272.tmp"', ErrorCode = '0x80004005' : 0.
Application 'MACHINE/WEBROOT/APPHOST/WEBAPPLICATION1' with physical root 'C:\Users\LindaL\source\repos\Daimto.RazorTest.Tools\WebApplication1\' failed to start process with commandline 'c:\program files (x86)\microsoft visual studio\2017\professional\common7\ide\extensions\microsoft\web tools\projectsystem\VSIISExeLauncher.exe -argFile "C:\Users\LindaL\AppData\Local\Temp\tmpF272.tmp"', ErrorCode = '0x80004005' : 0.

Note i just update to visual studio professional 2017 15.9.3. I have used blazor before this was working fine.

Update: This appears only in the "Blazor" project type.

Update2: hitting Cntrl-F5 as opposed to just F5 – No change.

Update3 Project file per request in comment in answer below

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <RunCommand>dotnet</RunCommand>
    <RunArguments>blazor serve</RunArguments>
    <LangVersion>7.3</LangVersion>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Blazor.Browser" Version="0.6.0" />
    <PackageReference Include="Microsoft.AspNetCore.Blazor.Build" Version="0.6.0" PrivateAssets="all" />

    <DotNetCliToolReference Include="Microsoft.AspNetCore.Blazor.Cli" Version="0.6.0" />
  </ItemGroup>

</Project>

Perhaps this can help you: odetocode.com/blogs/scott/archive/2018/11/05/… — enet
Did you update your Blazor Language Services extension if you had installed before? — Wanton
@CodeCaster yeah, the docs say that, but except for reload without (explicitly) recompiling, things do work when using F5. That's why when I was curious why reloading wasn't working (and only reloading) I was surprised to discover that guidance. That said, there's no advantage to running with the debugger, but everything basically works in my experience. — Kirk Woll
@Wanton I have been using Blazor for two or three weeks now i installed it by following this blazor.net/docs/get-started.html Yes Language Services extension was installed at the time. I am not exactly sure how to figure out if their are updates and install them. Should i assume that VS would pick up new releases of Blazor? — DaImTo

Wanton Wanton · Accepted Answer · 2018-12-05T21:08:31

Delete global.json and see if that helps.

https://github.com/aspnet/Blazor/issues/1342

If that doesn't help try adding global.json with content

{
  "sdk": {
    "version": "2.1.500"
  }
}

If all fails, close all Visual Studio instances and reinstall Blazor templates with dotnet new -i Microsoft.AspNetCore.Blazor.Templates and create new Blazor solution with dotnet new and use Blazor template you want.

Creating new blazor application throws an error when run

1 Answers