我觉得我的startup.cs有问题,因为我无法从<IOption> config
中获取任何值。
所以...我们有我们的appsettings.json
"Config": {
"ApplicationName": "some name",
"ConnectionString": "someconstring",
"Version": "1.0.0"
},
这里有我们的模型。
public class Config
{
public string ApplicationName { get; set; }
public string ConnectionString { get; set; }
public string Version { get; set; }
}
启动.cs
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public static IConfiguration Configuration { get; set; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc();
// Add functionality to inject IOptions<T>
services.AddOptions();
// Add our Config object so it can be injected
services.Configure<Config>(Configuration);
}
然后在我们的控制器中,我尝试加载这些数据,但不幸的是它们保持为空。
private IOptions<Config> config;
public CompaniesController(IOptions<Config> config)
{
this.config = config;
}
我尝试使用类似以下的代码更改startup.cs文件:
services.Configure<Config>(options =>
{
options.ConnectionString = Configuration.GetSection("Config:ConnectionString").Value;
});
但似乎这并没有起作用。
我使用的资源:
https://dzone.com/articles/dynamic-connection-string-in-net-core
https://dev59.com/fVwZ5IYBdhLWcg3wb_-Y
https://learn.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options?view=aspnetcore-2.2
但很明显我在这里缺少一个关键点。
编辑:我正在使用ASP.Net Core 2.0。
编辑2:
Program.cs
public class Program
{
public static void Main(string[] args)
{
BuildWebHost(args).Run();
}
public static IWebHost BuildWebHost(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.Build();
}
整个Appsettings.json文件。
{
"Config": {
"ApplicationName": "somename",
"ConnectionString": "someconstring",
"Version": "1.0.0"
},
"Logging": {
"IncludeScopes": false,
"Debug": {
"LogLevel": {
"Default": "Warning"
}
},
"Console": {
"LogLevel": {
"Default": "Warning"
}
}
}
}
appsettings.json
文件中删除Config
顶级属性。它没有提供任何价值,因为appsetings已经是“config”,并且这样做应该可以使services.Configure<Config>(Configuration)
正常工作。 - Henk Mollema