如何基于解决方案配置而非环境变量配置startup.cs? [英] How to configure startup.cs based on solution configuration and not environment variable?

问题描述

配置startup.cs的一种方法是根据环境变量检查环境，然后在Configure方法中运行相应的代码:

One way of configuring startup.cs is to check the environment based on an environmental variable, and run the appropriate code within the Configure method:

// 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();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
        // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
        app.UseHsts();
    }

    app.UseHttpsRedirection();
    app.UseStaticFiles();
    //app.UseCookiePolicy();

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
    });
}

对于正在使用的应用程序，我不能保证可以访问客户端计算机以添加ASPNETCORE_ENVIRONMENT环境变量，以确保将它们路由到正确的异常页面.但是我也不想一直要记住要在发布项目时注释掉某些代码.

For the app I'm working on, I can't guarantee that I will have access to clients' machines to add the ASPNETCORE_ENVIRONMENT environmental variable to make sure they're routed to the correct exception page. But I also don't want to keep having to remember to comment out certain code when I'm about to publish the project.

我该如何获取项目的配置名称来确定要运行的代码?:

How can I instead get the project's configuration name to determine what code I want run?:

以下是我想要完成的操作的伪代码:

Here's some pseudocode of what I'd like to accomplish:

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    //I get the configuration name (could be "Debug", "Development", or "Release)
    //from the list in the photo
    string configurationName = GetConfigurationName();

    //I compare the name to determine what error page to show
    if (configurationName == "Debug" || configurationName == "Development")
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
        // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
        app.UseHsts();
    }

    app.UseHttpsRedirection();
    app.UseStaticFiles();
    //app.UseCookiePolicy();

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");
    });
}

推荐答案

如果无法使其与环境兼容，则可以使用

If you can't make it work with the environment, you could use a preprocessor directive. When deploying your code to production, make sure you are compiling with RELEASE as solution configuration:

#if DEBUG
    app.UseDeveloperExceptionPage();
#elif RELEASE
    app.UseExceptionHandler("/Home/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
#endif

您可以找到一些不错的示例这里:

You can find some nice examples here:

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