我如何在appsettings.json中设置连接字符串？

Question

如何在我创建appsettings.json的ASP.NET Core blazor WebAssembly Server组件中设置连接字符串。>

{
  "ConnectionStrings": {
    "SQLiteTestConnection": "Data Source=./TestDB.db",
  }
}
现在看起来像这样，但是我无法通过Update-Database创建数据库。

Startup.cs：

...
 public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            services.AddResponseCompression(opts =>
            {
                opts.MimeTypes = ResponseCompressionDefaults.MimeTypes.Concat(
                    new[] { "application/octet-stream" });
            });

            // Adding the DbContext references
            services.AddDbContext<SQLiteTestDbContext>(options =>
                options.UseSqlite("./TestDB.db"));
        }
...
我正在使用的DbContext。此DbContext存储在我的Blazor Server组件中

using DB_SQLite;
using DB_SQLite.SQL_Models;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;

namespace BlazorWeb.Server.Data
{
    public class SQLiteTestDbContext : DbContext
    {
        #region Constructor

        // Default parameterless Constructor 
        public SQLiteTestDbContext(DbContextOptions options)
            : base(options)
        {

        }

        #endregion


        public DbSet<ObjectModel> Objects { get; set; }


        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
            => optionsBuilder.UseSqlite("Data Source=./TestDB.db");


        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            #region Configure Object


            modelBuilder.Entity<ObjectModel>().HasData(LoadObjects());
            base.OnModelCreating(modelBuilder);

            #endregion
        }

        #region Seeding

        private List<ObjectModel> LoadObjects()
        {
            return new List<ObjectModel>
            {
                new ObjectModel() { Id = 1, Name = "Schraube", TagName = "Werkzeug" ,PreviewImage = "null"},
                new ObjectModel() { Id = 2, Name = "Gabelstapler", TagName = "Fahrzeug" ,PreviewImage = "null"},
                new ObjectModel() { Id = 3, Name = "Zange", TagName = "Werkzeug" , PreviewImage = "null"},
                new ObjectModel() { Id = 4, Name = "Sechskantschraube", TagName = "Werkzeug", PreviewImage = "null"},
            };
        }

        #endregion
    }
}

我还在DbContext类的数据库中创建了一些虚假数据。

如何在我创建appsettings.json的ASP.NET Core blazor WebAssembly Server组件中设置连接字符串。 {“ ConnectionStrings”：{“ SQLiteTestConnection”：“数据源=。/ ...

Answer 1

在您的Startup.cs类中，将IConfiguration的实例声明为字段，并在构造函数中对其进行初始化。