Azure WebApp Asp.NET Core 2错误：启动应用程序时发生错误

在使用 Azure WebApp 运行 Asp.NET Core 2 应用程序时，有时会遇到启动应用程序时发生错误的问题。这个问题可能会导致应用程序无法正常启动，给开发和调试带来一些困扰。本文将介绍这个错误的一般原因，并提供一些解决方案。

An error occurred while starting the application.
.NET Core 2.0 is not installed or not correctly installed.

csharp
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
namespace MyWebApp
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
        }
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                app.UseHsts();
            }
            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseCookiePolicy();
            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}