Question

我目前正在.net核心2.0中创建一个Web Api，我只是无法使我的连接字符串起作用。

我已将我的连接字符串放入appsettings.json并将其加载到startup.cs

中

Appsettings.json

{
"Logging": {
"IncludeScopes": false,
"Debug": {
  "LogLevel": {
    "Default": "Warning"
  }
},
"Console": {
  "LogLevel": {
    "Default": "Warning"
  }
},
"ConnectionStrings": {
  "DatabaseConnection": "Data Source=VMDEVSLN-EOE\\SQLEXPRESS;Initial Catalog=EmployeeDB;Integrated Security=True"
  }
 }
}

Startup.cs

        public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc();
        var connection = Configuration.GetConnectionString("DatabaseConnection");
        services.AddDbContext<DatabaseContext>(options => options.UseSqlServer(connection));
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseMvc();
    }
}

的DbContext

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

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

我相信问题出在我appsettings.json的某处，但我找不到它

Answer 1

您的ConnectionStrings部分位于Logging部分内，我不知道您的意思是否相同，但无论如何您可以像这样访问DatabaseConnection：

var connection = Configuration["Logging:ConnectionStrings:DatabaseConnection"];

Answer 2

在asp.net core 1.x中，您应该通过ConfigurationBuilder阅读设置。在Startup.cs

public Startup(IHostingEnvironment env)
{
    var builder = new ConfigurationBuilder()
        .SetBasePath(env.ContentRootPath)
        .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
        .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
        .AddEnvironmentVariables();
    Configuration = builder.Build();
}

它可能与asp.net核心2中的方法相同。

.Net Core Cant从appsettings.json读取连接字符串

2 个答案: