对于blazor服务器应用程序，我这样做:Startup.cs直接在命名空间声明add

namespace myProjectName.Server

public static class myGlobals

{
    public static bool isDevelopment = true;
}

Startup.cs找到Configure方法和env. cs的现有检查。并将上面声明的静态IsDevelopment设置为true或false。

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
           myGlobals.isDevelopment = true;
        }
        else false

在ApplicationUser中初始化数据库连接或其他任何地方

        if (myGlobals.isDevelopment)
        {

来自文档

Configure和ConfigureServices支持特定环境的版本 配置{EnvironmentName}和配置{EnvironmentName}形式的服务:

你可以这样做……

public void ConfigureProductionServices(IServiceCollection services)
{
    ConfigureCommonServices(services);
    
    //Services only for production
    services.Configure();
}

public void ConfigureDevelopmentServices(IServiceCollection services)
{
    ConfigureCommonServices(services);
    
    //Services only for development
    services.Configure();
}

public void ConfigureStagingServices(IServiceCollection services)
{
    ConfigureCommonServices(services);
    
    //Services only for staging
    services.Configure();
}

private void ConfigureCommonServices(IServiceCollection services)
{
    //Services common to each environment
}

你可以很容易地在ConfigureServices中访问它，只是在Startup方法期间将它持久化到一个属性，该方法首先被调用并将其传递进来，然后你可以从ConfigureServices访问该属性。

public Startup(IWebHostEnvironment env, IApplicationEnvironment appEnv)
{
    ...your code here...
    CurrentEnvironment = env;
}

private IWebHostEnvironment CurrentEnvironment{ get; set; } 
 
public void ConfigureServices(IServiceCollection services)
{
    string envName = CurrentEnvironment.EnvironmentName;
    ... your code here...
}

由于还没有完整的复制和粘贴解决方案，基于Joe Audette的回答:

public IWebHostEnvironment Environment { get; }

public Startup(IWebHostEnvironment environment, IConfiguration configuration)
{
   Environment = environment;
   ...
}

public void ConfigureServices(IServiceCollection services)
{
   if (Environment.IsDevelopment())
   {
       // Do something
   }else{
       // Do something
   }
   ...
}

如果你需要在你的代码库中某个不容易访问IHostingEnvironment的地方测试这个，另一个简单的方法是这样做的:

bool isDevelopment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") == "Development";

以防有人也在看这个。在.net core 3+中，这些都已经过时了。更新方式为:

public void Configure(
    IApplicationBuilder app,
    IWebHostEnvironment env,
    ILogger<Startup> logger)
{
    if (env.EnvironmentName == Environments.Development)
    {
        // logger.LogInformation("In Development environment");
    }
}