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I am getting this error while trying to run the asp.net core project.
One or more compilation references are missing. Ensure project is referencing 'Microsoft.NET.Sdk.web' & PreserveCompilationContext property is not set to false
EfDemo.csproj
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp2.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.6" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.1.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.1.1" />
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.1" />
</ItemGroup>
<ItemGroup>
<DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />
<DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
</ItemGroup>
</Project>
HomeController.cs
namespace EfDemo.Controllers
{
public class HomeController : Controller
{
async public Task<IActionResult> Index()
{
using (var context = new EFCoreWebDemoContext())
{
var model = await context.Authors.AsNoTracking().ToListAsync();
return View(model);
}
}
}
}
EFCoreWebDemoContext.cs
public class EFCoreWebDemoContext : DbContext
{
public DbSet<Book> Books { get; set; }
public DbSet<Author> Authors { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlServer(@"connection string");
}
}
Index.cshtml
@{
ViewData["Title"] = "Home Page";
}
<div>
<span>Home Page</span>
</div>
_Layout.cshtml
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>@ViewData["Title"] - EfDemo</title>
</head>
<body>
@RenderBody()
@RenderSection("Scripts", required: false)
</body>
</html>
_ViewImports.cshtml
@using EfDemo
@using EfDemo.Models
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
@addTagHelper *, Microsoft.NET.Sdk
Added breakpoint and checked while executing the application it crashes on return View(model); in HomeController.cs file
Tried modifying the HomeController.cs shown below but still the same issue.
public IActionResult Index()
{
return View();
}
426
The Reference Versions are conflict.
I suggest you try modify csproj like below:
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp2.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.6" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.0.3" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.3" />
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.0.4" />
</ItemGroup>
<ItemGroup>
<DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />
<DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
</ItemGroup>
</Project>
Updated csproj file with below packages and updated visual studio to 15.7.5 which wokred
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp2.1</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.AspNetCore.App" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.1.1" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.1.1" />
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.1" />
</ItemGroup>
</Project>
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