时间：2023-01-07 09:28:58 | 栏目：.NET代码 | 点击：次
vs2022正式版已经推出了，估计很多人已经下载并开始创建.Net 6 开始尝鲜了, 本节我简要的给大家介绍一下.Net 6的一些改动。
本次.Net6带来最明显的变化就是：
Program.Main()了。var builder = WebApplication.CreateBuilder(args); var app = builder.Build(); app.Run();
对于这样的改动大家可能会觉得这是C# 10 带来的优化，但我的理解是.Net6为了新手更加方便入门，早期我们使用.Net Core 2/3/5 版本，还要给新人解释系统启动入口Program.Main()以后不需要了，配置拆分成两个文件Program.cs和Startup.cs虽然做到了关注点分离，但是对于新人会难以理解这次也没了，当我们讨论Startup的时候不用在去解释如何调用的2个约定方法，即使它们没有显式实现接口，也可以调用它们。
我们来看一下之前的语法，我们有一大堆嵌套的 lambda，代码看上去非常复杂。
var hostBuilder = Host.CreateDefaultBuilder(args)
.ConfigureServices(services =>
{
services.AddControllers();
})
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.Configure((ctx, app) =>
{
if (ctx.HostingEnvironment.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseStaticFiles();
app.UseRouting();
app.UseEndpoints(endpoints =>
{
endpoints.MapGet("/", () => "Hello World!");
endpoints.MapRazorPages();
});
});
});
hostBuilder.Build().Run();
升级到.Net 6之后，我们可以使用更简单的 API 来实现。
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
var app = builder.Build();
app.MapGet("/", () => "Hello World!");
app.Run();
我们将 2个版本的语法对比来看
var hostBuilder = Host.CreateDefaultBuilder(args);
hostBuilder.ConfigureServices(services =>
{
services.AddControllers();
services.AddSingleton<MyThingy>();
})
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.AddSingleton<MyThingy>();
var hostBuilder = Host.CreateDefaultBuilder(args);
hostBuilder.ConfigureLogging(builder =>
{
builder.AddFile();
})
var builder = WebApplication.CreateBuilder(args);
builder.Logging.AddFile();
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.UseSerilog() // <-- Add this line
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
builder.Host.UseSerilog();
public interface IHelloService
{
string Hello(bool isHappy);
}
public class HelloService : IHelloService
{
public string Hello(bool isHappy)
{
var hello = $"Hello World";
if (isHappy)
return $"{hello}, you seem to be happy today";
return hello;
}
}
using MinimalApiDemo;
using System.Security.Claims;
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddScoped<IHelloService, HelloService>();
// Add services to the container.
builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}
app.UseHttpsRedirection();
app.UseAuthorization();
app.MapControllers();
app.MapGet("/Hello", (bool? isHappy, IHelloService service) =>
{
if (isHappy is null)
return Results.BadRequest("Please tell if you are happy or not :-)");
return Results.Ok(service.Hello((bool)isHappy));
});
app.Run();