無法創建“Sooziales_NetzwerkDbContext”型別的物件

我嘗試使用創建新資料庫dotnet ef migrations add InitialCreate --context Sooziales_NetzwerkDbContext并收到此錯誤：無法創建型別為“Sooziales_NetzwerkDbContext”的物件。有關設計時支持的不同模式，請參閱https://go.microsoft.com/fwlink/?linkid=851728。構建成功，但失敗并顯示該錯誤訊息。我將 Sqlite 用于我的資料庫。這是我的代碼：

Sooziales_NetzwerkDbContext：

using Microsoft.EntityFrameworkCore;
using Sooziales_Netzwerk.Models;

namespace Sooziales_Netzwerk.Data{

public class Sooziales_NetzwerkDbContext : DbContext
{
    public Sooziales_NetzwerkDbContext(DbContextOptions<Sooziales_NetzwerkDbContext> options)
        : base(options)
    {
    }

    public DbSet<Link> Link {get; set;}
}
}

鏈接.cs：

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Sooziales_Netzwerk.Models;

public class Link{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int idLink {get; set;}

[Display(Name = "Enter Link")]
[Required(ErrorMessage = "Upload without a link make no sence")]
public string link {get; set;}

[Display(Name = "Enter Username")]
[Required(ErrorMessage = "Upload without a link make no sence")]
public string username {get; set;}

[Display(Name = "Enter Likes")]
[Required(ErrorMessage = "Upload without a link make no sence")]
public int likes {get; set;}
}

程式.cs：

using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Sooziales_Netzwerk.Data;

var builder = WebApplication.CreateBuilder(args);

var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlite(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();

builder.Services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
.AddEntityFrameworkStores<ApplicationDbContext>();
builder.Services.AddControllersWithViews();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseMigrationsEndPoint();
}
else
{
app.UseExceptionHandler("/Home/Error");
app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthentication();
app.UseAuthorization();

app.MapControllerRoute(
name: "default",
pattern: "{controller=Home}/{action=Index}/{id?}");
app.MapRazorPages();

app.Run();

uj5u.com熱心網友回復：

1.在 Program.cs 中添加以下代碼：

builder.services.AddDbContext<Sooziales_NetzwerkDbContext>(options => options.UseSqlServer(Configuration["ConnectionStrings:DefaultConnection1"]));

2. 在 appsettings.json 檔案中添加了一個連接字串"ConnectionStrings"：如下所示：

     "DefaultConnection1": "Server=(localdb)\\mssqllocaldb;Database=Sooziales_NetzwerkDbContext -7dc5b790-765f-4381-988c-5167405bb107;Trusted_Connection=True;MultipleActiveResultSets=true"
   

uj5u.com熱心網友回復：

將此添加到 Program.cs：

builder.Services.AddDbContext<Sooziales_NetzwerkDbContext>(options => options.UseSqlite(builder.Configuration.GetConnectionString("LinkConnection")));

這對于 appsettings.json：

    "LinkConnection": "DataSource=links.db"

標籤：C＃ 网 asp.net-mvc sqlite asp.net 核心

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