Deploying dotnet core to Heroku - asp.net

Question

I'm trying to deploy my dotnet core application to Heroku, but keep running up against this error:
Restore failed
unknown keyword platform
! Push rejected, failed to compile Web app app.
! Push failed
When I use dotnet run from the CLI (I'm on a mac) everything runs fine. I've included my Project.json below in case that helps:
{
"dependencies": {
"Microsoft.NETCore.App": {
"version": "1.0.0",
"type": "platform"
},
"Microsoft.AspNetCore.Mvc": "1.0.0",
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
"Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
"Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
"Microsoft.Extensions.Configuration.Json": "1.0.0",
"Microsoft.Extensions.Configuration.CommandLine": "1.0.0",
"Microsoft.Extensions.Logging": "1.0.0",
"Microsoft.Extensions.Logging.Console": "1.0.0",
"Microsoft.Extensions.Logging.Debug": "1.0.0",
"Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
"Microsoft.EntityFrameworkCore.Sqlite": "1.0.0",
"Microsoft.EntityFrameworkCore.Design": {
"version": "1.0.0-preview2-final",
"type": "build"
}
},
"tools": {
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2- final",
"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"
},
"frameworks": {
"netcoreapp1.0": {
"imports": [
"dotnet5.6",
"portable-net45+win8"
]
}
},
"buildOptions": {
"emitEntryPoint": true,
"preserveCompilationContext": true
},
"runtimeOptions": {
"configProperties": {
"System.GC.Server": true
}
},
"publishOptions": {
"include": [
"wwwroot",
"Views",
"Areas/**/Views",
"appsettings.json",
"web.config"
]
},
"tooling": {
"defaultNamespace": "Tokens_monolith"
}
}

Answer 1

I finally got this successfully deployed to Heroku, it's all up and running. Tseng was a huge help on this, so thank you. My buildpack that I was using was targeting an older version of .NET Core. Heroku has an experimental buildpack targeting ASPNET5 here: https://github.com/heroku/dotnet-buildpack.
As of the time of this answer, this buildpack is using Mono for runtime execution. There is a pull request to use the .NET CLI that I used and it works great. It can be found here: https://github.com/noliar/dotnet-buildpack. Hopefully they accept this pull request soon. This was the buildpack that I used.
Hope this helps someone.