關於.NET6 Minimal API的使用方式詳解

var app = WebApplication.Create(args);
app.MapGet("/", () => "Hello World");
app.Run();

var app = WebApplication.Create(args);
app.MapGet("/", () => "Hello World");
app.Run("http://localhost:6666");

var app = WebApplication.Create(args);
app.Urls.Add("http://localhost:6666");
app.Urls.Add("http://localhost:8888");
app.MapGet("/", () => "Hello World");
app.Run();

ASPNETCORE_URLS=http://localhost:6666

ASPNETCORE_URLS=http://localhost:6666;https://localhost:8888

var app = WebApplication.Create(args);
app.Urls.Add("http://*:6666");
app.Urls.Add("http://+:8888");
app.Urls.Add("http://0.0.0.0:9999");
app.MapGet("/", () => "Hello World");
app.Run();

ASPNETCORE_URLS=http://*:6666;https://+:8888;http://0.0.0.0:9999

var builder = WebApplication.CreateBuilder(args);
builder.Logging.AddJsonConsole();
var app = builder.Build();
app.Logger.LogInformation("讀取到的配置信息:{content}", builder.Configuration.GetSection("consul").Get<ConsulOption>());
app.Run();

var builder = WebApplication.CreateBuilder(new WebApplicationOptions
{
    ApplicationName = typeof(Program).Assembly.FullName,
    ContentRootPath = Directory.GetCurrentDirectory(),
    EnvironmentName = Environments.Staging
});

Console.WriteLine($"應用程序名稱: {builder.Environment.ApplicationName}");
Console.WriteLine($"環境變量: {builder.Environment.EnvironmentName}");
Console.WriteLine($"ContentRoot目錄: {builder.Environment.ContentRootPath}");

var app = builder.Build();

var builder = WebApplication.CreateBuilder(args);
builder.Host.ConfigureDefaults(args).ConfigureWebHostDefaults(webBuilder =>
{
    webBuilder.UseStartup<Startup>();
});

var app = builder.Build();

var builder = WebApplication.CreateBuilder(args);
builder.WebHost.UseStartup<Startup>();
builder.WebHost.UseWebRoot("webroot");

var app = builder.Build();

var builder = WebApplication.CreateBuilder(args);
builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory());
//之前在Startup中配置ConfigureContainer可以使用如下方式
builder.Host.ConfigureContainer<ContainerBuilder>(builder => builder.RegisterModule(new MyApplicationModule()));

var app = builder.Build();

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();
//判斷環境變量
if (app.Environment.IsDevelopment())
{
    //異常處理中間件
    app.UseDeveloperExceptionPage();
    app.UseSwagger();
    app.UseSwaggerUI();
}
//啟用靜態文件
app.UseStaticFiles();

app.UseAuthorization();
app.MapControllers();

app.Run();

app.MapPost("/goods",([FromBody]Goods goods, [FromServices]Person person) =>$"{person.Name}添加商品{goods.GName}成功");

app.MapPost("/goods", GoodsHandler.AddGoods);

class GoodsHandler
{
    public static string AddGoods(Goods goods, Person person, int age = 20) => $"{person.Name}添加商品{goods.GName}成功";
}

public static string AddGoods([FromBody] Goods goods, [FromServices] Person person, [FromQuery]int age = 20) => $"{person.Name}添加商品{goods.GName}成功";

app.MapGet("/getcontext",(HttpContext context,HttpRequest request,HttpResponse response) => response.WriteAsync($"IP:{context.Connection.RemoteIpAddress},Request Method:{request.Method}"));

app.MapGet("/address/getarray",(Address address) => address.Addresses);

public class Address
{
    public List<string>? Addresses { get; set; }

    public static bool TryParse(string? addressStr, IFormatProvider? provider, out Address? address)
    {
        var addresses = addressStr?.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
        if (addresses != null && addresses.Any())
        {
            address = new Address { Addresses = addresses.ToList() };
            return true;
        }
        address = new Address();
        return false;
    }
}

app.MapGet("/address/getarray",(Address address) => address.Addresses);

public class Address
{
    public List<string>? Addresses { get; set; }

    public static ValueTask<Address?> BindAsync(HttpContext context, ParameterInfo parameter)
    {
        string addressStr = context.Request.Query["address"];
        var addresses = addressStr?.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
        Address address = new();
        if (addresses != null && addresses.Any())
        {
            address.Addresses = addresses.ToList();
            return ValueTask.FromResult<Address?>(address);
        }
        return ValueTask.FromResult<Address?>(address);
    }
}

app.MapGet("/hello", () => "Hello World");

app.MapGet("/simple", () => new { Message = "Hello World" });
//或者是
app.MapGet("/array",()=>new string[] { "Hello", "World" });
//亦或者是EF的返回結果
app.Map("/student",(SchoolContext dbContext,int classId)=>dbContext.Student.Where(i=>i.ClassId==classId));

//成功結果
app.MapGet("/success",()=> Results.Ok("Success"));
//失敗結果
app.MapGet("/fail", () => Results.BadRequest("fail"));
//404結果
app.MapGet("/404", () => Results.NotFound());
//根據邏輯判斷返回
app.Map("/student", (SchoolContext dbContext, int classId) => {
    var classStudents = dbContext.Student.Where(i => i.ClassId == classId);
    return classStudents.Any() ? Results.Ok(classStudents) : Results.NotFound();
});

public static IResult File(byte[] fileContents,string? contentType = null,
string? fileDownloadName = null,
bool enableRangeProcessing = false,
DateTimeOffset? lastModified = null,
EntityTagHeaderValue? entityTag = null)
=> new FileContentResult(fileContents, contentType)
{
    FileDownloadName = fileDownloadName,
    EnableRangeProcessing = enableRangeProcessing,
    LastModified = lastModified,
    EntityTag = entityTag,
};

public static IResult Json(object? data, JsonSerializerOptions? options = null, string? contentType = null, int? statusCode = null)
            => new JsonResult
            {
                Value = data,
                JsonSerializerOptions = options,
                ContentType = contentType,
                StatusCode = statusCode,
            };

static class ResultsExtensions
{
    //基於IResultExtensions寫擴展方法
    public static IResult Html(this IResultExtensions resultExtensions, string html)
    {
        ArgumentNullException.ThrowIfNull(resultExtensions, nameof(resultExtensions));
        //自定義的HtmlResult是IResult的實現類
        return new HtmlResult(html);
    }
}

class HtmlResult:IResult
{
    //用於接收html字符串
    private readonly string _html;

    public HtmlResult(string html)
    {
        _html = html;
    }

    /// <summary>
    /// 在該方法寫自己的輸出邏輯即可
    /// </summary>
    /// <returns></returns>
    public Task ExecuteAsync(HttpContext httpContext)
    {
        httpContext.Response.ContentType = MediaTypeNames.Text.Html;
        httpContext.Response.ContentLength = Encoding.UTF8.GetByteCount(_html);
        return httpContext.Response.WriteAsync(_html);
    }
}

app.MapGet("/hello/{name}", (string name) => Results.Extensions.Html(@$"<html>
    <head><title>Index</title></head>
    <body>
        <h1>Hello {name}</h1>
    </body>
</html>"));