添加c.RoutePrefix = string.Empty;，将更改起始页。
默认情况下，url应该是https://ip：port/swagger/index.html。在你发布这个应用程序后，你会得到404错误，别担心，你可以在url中添加swagger，它会显示index.html。

的数据

public void ConfigureServices(IServiceCollection services)
{
    services.AddControllers();
    ...
    services.AddSwaggerGen();
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    ...
    app.UseSwagger();
    app.UseSwaggerUI(c =>
    {
        if (env.IsDevelopment() || env.IsProduction())

        {
            c.SwaggerEndpoint("/swagger/v1/swagger.json", "My Test1 Api v1");
            // Add this line, it will work for you
            c.RoutePrefix = string.Empty;
        }
    });

    app.UseHttpsRedirection();

    app.UseRouting();

    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });
}

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This also works. it's like a charm.