使用 Asp.net 核心生成带有视图的控制器

Question

我使用项目 asp.net 核心但是当我想为模型生成带有视图的控制器时出现错误：

There was an error creating the DbContext instance to get the model. No parameterless constructor defined for this object. No parameterless constructor defined for this object. at Microsoft.VisualStudio.Web.CodeGeneration.ActionInvoker.b__6_0() at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args) at Microsoft.VisualStudio.Web.CodeGeneration.CodeGenCommand.Execute(String[] args)

这是 DBContext :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using WebApplication.Models;
using Microsoft.EntityFrameworkCore;
using System.ComponentModel.DataAnnotations;
using MySQL.Data.EntityFrameworkCore.Extensions;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.EntityFrameworkCore.Design.Internal;


namespace WebApplication
{
public class HunterViewContext : DbContext
{
    public HunterViewContext(DbContextOptions<HunterViewContext> options)
    : base(options)
    { }
    public DbSet<User> User{ get; set; }       
}
}

DBContextFactory：

using Microsoft.EntityFrameworkCore;
using MySQL.Data.EntityFrameworkCore.Extensions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebApplication.Models
{
public static class HunterViewContextFactory
{
    public static HunterViewContext Create(string connectionString)
    {
        var optionsBuilder = new DbContextOptionsBuilder<HunterViewContext>   ();
        optionsBuilder.UseMySQL(connectionString);

        //Ensure database creation
        var context = new HunterViewContext(optionsBuilder.Options);
        context.Database.EnsureCreated();

        return context;
    }
    }
    }

模特：

using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.EntityFrameworkCore.Design.Internal;

namespace WebApplication.Models
{
public class User 
{

    public User()
    {

    }
        public int Id { get; set; }

        [MaxLength(30)]
        public string Name { get; set; }

        [MaxLength(50)]
        public string LastName { get; set; }
    }

    }

这是我想为模型用户创建带有视图的 MVC 控制器时的错误

Answer 1

您是否正在尝试使用 Visual Studio 代码脚手架功能来自动生成控制器 class 和视图？如果是这样，ASP.Net 核心项目模板尚不支持它。您需要自己创建视图和控制器classes，参考文档Add Controllers

打开 project.json 文件并添加以下包依赖项和工具

在依赖部分

添加以下包

//代码生成器包生成控制器，视图

"Microsoft.VisualStudio.Web.CodeGenerators.Mvc": "1.0.0-preview2-final", 
"Microsoft.VisualStudio.Web.CodeGeneration.Tools": "1.0.0-preview2-final"

在工具部分

添加以下工具

//访问命令工具代码生成

"Microsoft.VisualStudio.Web.CodeGeneration.Tools": "1.0.0-preview2-final"

详情请参阅Scaffolding in ASP.NET Core。

使用 Asp.net 核心生成带有视图的控制器

Generating a Controller with views Using Asp.net Core

controller

views

asp.net-core-mvc

asp.net-core