[英]How to set Environment Name (IHostingEnvironment.EnvironmentName)?
[英]Environment variable set but HostingEnvironment.EnvironmentName not updated
我正在運行 .net 核心 2.2 並在 windows 服務中托管 asp.net 核心。
例如。 看到這個https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/windows-service?view=aspnetcore-2.2&tabs=visual-studio
我將環境變量 ASPNETCORE_ENVIRONMENT 設置為“Dev”
只是為了確認,在我的launchsettings.json
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT ": "Dev"
}
啟動時 HostingEnvironment.EnvironmentName 的值沒有更新,並且仍然具有默認的“Production”。 為什么不是“開發”?
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.ConfigureLogging((hostingContext, logging) =>
{
logging.AddEventLog();
})
.ConfigureAppConfiguration((context, config) =>
{
// Configure the app here.
var env = context.HostingEnvironment;
config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);
})
.UseStartup<Startup>();
}
我花了很長時間試圖找出在這種情況下對我來說最好的事情。
我最終從 Microsoft.Extensions.Hosting.Host.CreateDefaultBuilder 中獲取了代碼,並在構建器上添加了 .UseEnvironment 擴展。
builder.UseEnvironment(Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Development");
我默認使用 Development 而不是通常首選的 Production,但這是個人喜好。
它是有限的,如果你想聰明一點並檢查命令行 arguments 等等,請隨意。 這是一個開始的地方。
public static IHostBuilder CreateDefaultBuilder(string[] args)
{
var builder = new HostBuilder();
// This line has been added to read the environment variable.
builder.UseEnvironment(Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Development");
builder.UseContentRoot(Directory.GetCurrentDirectory());
builder.ConfigureHostConfiguration(config =>
{
config.AddEnvironmentVariables(prefix: "DOTNET_");
if (args != null)
{
config.AddCommandLine(args);
}
});
builder.ConfigureAppConfiguration((hostingContext, config) =>
{
var env = hostingContext.HostingEnvironment;
config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);
if (env.IsDevelopment() && !string.IsNullOrEmpty(env.ApplicationName))
{
var appAssembly = Assembly.Load(new AssemblyName(env.ApplicationName));
if (appAssembly != null)
{
config.AddUserSecrets(appAssembly, optional: true);
}
}
config.AddEnvironmentVariables();
if (args != null)
{
config.AddCommandLine(args);
}
})
.ConfigureLogging((hostingContext, logging) =>
{
var isWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
// IMPORTANT: This needs to be added *before* configuration is loaded, this lets
// the defaults be overridden by the configuration.
if (isWindows)
{
// Default the EventLogLoggerProvider to warning or above
logging.AddFilter<EventLogLoggerProvider>(level => level >= Microsoft.Extensions.Logging.LogLevel.Warning);
}
logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
logging.AddConsole();
logging.AddDebug();
logging.AddEventSourceLogger();
if (isWindows)
{
// Add the EventLogLoggerProvider on windows machines
logging.AddEventLog();
}
})
.UseDefaultServiceProvider((context, options) =>
{
var isDevelopment = context.HostingEnvironment.IsDevelopment();
options.ValidateScopes = isDevelopment;
options.ValidateOnBuild = isDevelopment;
});
return builder;
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.