引用丢失。确保项目引用的是“ Microsoft.NET.Sdk.web”，并且PreserveCompilationContext属性未设置为false

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引用丢失。确保项目引用的是“ Microsoft.NET.Sdk.web”，并且PreserveCompilationContext属性未设置为false

Sha*_*ath 5 c# entity-framework-core asp.net-core-mvc asp.net-core

尝试运行asp.net核心项目时出现此错误。

缺少一个或多个编译参考。确保项目引用的是“ Microsoft.NET.Sdk.web”，并且PreserveCompilationContext属性未设置为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>

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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);
            }
        }
    }
}

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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");
    }
 }

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Index.cshtml

@{
    ViewData["Title"] = "Home Page";
}

<div>
    <span>Home Page</span>
</div>

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_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>

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_ViewImports.cshtml

@using EfDemo
@using EfDemo.Models
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
@addTagHelper *, Microsoft.NET.Sdk

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添加断点并在执行应用程序时检查它在返回View（model）时崩溃；在HomeController.cs文件中

尝试修改如下所示的HomeController.cs，但仍然存在相同的问题。

public IActionResult Index()
{
    return View();
}

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Answer 1

Tao*_*hou 3

他们Reference Versions是冲突的。

我建议你尝试csproj如下修改：

<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>

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是的，您可以从“NuGet”降级到“2.0.*”版本。您的“TargetFramework”是“netcoreapp2.0”，因此，您需要将引用保留为“2.0.*” (2认同)

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