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C#中創(chuàng)建統(tǒng)一API接口的實(shí)現(xiàn)方案

 更新時間：2025年04月04日 08:52:17   作者：老胖閑聊  
在 C# 中創(chuàng)建統(tǒng)一 API 接口需要從架構(gòu)設(shè)計(jì)、技術(shù)選型和代碼實(shí)現(xiàn)等多個層面進(jìn)行規(guī)劃,本文給大家詳細(xì)介紹了實(shí)現(xiàn)方案和完整示例代碼,對大家的學(xué)習(xí)或工作有一定的幫助,需要的朋友可以參考下

一、技術(shù)選型與架構(gòu)設(shè)計(jì)

  1. 框架選擇

    • ASP.NET Core (6.0+)
    • RESTful API 規(guī)范

  2. 核心組件

    • 統(tǒng)一響應(yīng)格式：標(biāo)準(zhǔn)化 JSON 響應(yīng)結(jié)構(gòu)
    • 全局異常處理：統(tǒng)一錯誤返回
    • 版本控制：API 版本管理
    • 認(rèn)證授權(quán)：JWT Bearer 認(rèn)證
    • 數(shù)據(jù)驗(yàn)證：Model Validation
    • 日志記錄：Serilog 或內(nèi)置 ILogger
    • Swagger 文檔：OpenAPI 規(guī)范支持

  3. 架構(gòu)分層

API Layer (Controllers)
↓
Application Layer (Services)
↓
Domain Layer (Models, Interfaces)
↓
Infrastructure Layer (Repositories)

二、完整實(shí)現(xiàn)步驟

1. 創(chuàng)建項(xiàng)目

dotnet new webapi -n UnifiedApiDemo

2. 添加 NuGet 包

dotnet add package Microsoft.AspNetCore.Mvc.Versioning
dotnet add package Swashbuckle.AspNetCore
dotnet add package Microsoft.AspNetCore.Authentication.JwtBearer

三、核心代碼實(shí)現(xiàn)

1. 統(tǒng)一響應(yīng)模型

public class ApiResponse<T>
{
    public int Code { get; set; }
    public string Message { get; set; }
    public T Data { get; set; }
    public DateTime Timestamp { get; } = DateTime.UtcNow;

    public static ApiResponse<T> Success(T data) => new() 
    { 
        Code = 200, 
        Message = "Success", 
        Data = data 
    };
    
    public static ApiResponse<object> Error(int code, string message) => new() 
    { 
        Code = code, 
        Message = message 
    };
}

2. 全局異常處理中間件

public class ExceptionMiddleware
{
    private readonly RequestDelegate _next;
    private readonly ILogger<ExceptionMiddleware> _logger;

    public ExceptionMiddleware(RequestDelegate next, ILogger<ExceptionMiddleware> logger)
    {
        _next = next;
        _logger = logger;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        try
        {
            await _next(context);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Global exception occurred");
            await HandleExceptionAsync(context, ex);
        }
    }

    private static Task HandleExceptionAsync(HttpContext context, Exception exception)
    {
        context.Response.ContentType = "application/json";
        context.Response.StatusCode = exception switch
        {
            ValidationException => StatusCodes.Status400BadRequest,
            UnauthorizedAccessException => StatusCodes.Status401Unauthorized,
            _ => StatusCodes.Status500InternalServerError
        };

        return context.Response.WriteAsJsonAsync(ApiResponse<object>.Error(
            context.Response.StatusCode,
            exception.Message
        ));
    }
}

3. 統(tǒng)一響應(yīng)包裝過濾器

public class ApiResponseFilter : IAsyncResultFilter
{
    public async Task OnResultExecutionAsync(
        ResultExecutingContext context, 
        ResultExecutionDelegate next)
    {
        if (context.Result is ObjectResult objResult)
        {
            var apiResponse = ApiResponse<object>.Success(objResult.Value);
            context.Result = new ObjectResult(apiResponse)
            {
                StatusCode = objResult.StatusCode
            };
        }
        await next();
    }
}

4. 配置服務(wù)（Program.cs）

var builder = WebApplication.CreateBuilder(args);

// 添加版本控制
builder.Services.AddApiVersioning(options =>
{
    options.DefaultApiVersion = new ApiVersion(1, 0);
    options.AssumeDefaultVersionWhenUnspecified = true;
    options.ReportApiVersions = true;
});

// 配置 Swagger
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo { Title = "Unified API", Version = "v1" });
});

// 添加統(tǒng)一響應(yīng)過濾器
builder.Services.AddControllers(options =>
{
    options.Filters.Add<ApiResponseFilter>();
});

// 配置 JWT 認(rèn)證
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options => 
    {
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidIssuer = "your_issuer",
            ValidateAudience = true,
            ValidAudience = "your_audience",
            ValidateLifetime = true,
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("your_secret_key"))
        };
    });

var app = builder.Build();

// 中間件管道
app.UseSwagger();
app.UseSwaggerUI();
app.UseMiddleware<ExceptionMiddleware>();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllers();
app.Run();

5. 控制器示例（帶版本控制）

[ApiController]
[Route("api/v{version:apiVersion}/[controller]")]
[ApiVersion("1.0")]
[Authorize]
public class ProductsController : ControllerBase
{
    [HttpGet("{id}")]
    [ProducesResponseType(typeof(ProductDto), 200)]
    public IActionResult GetProduct(int id)
    {
        var product = new ProductDto { Id = id, Name = "Sample Product" };
        return Ok(product);
    }

    [HttpPost]
    [ValidateModel]
    public IActionResult CreateProduct([FromBody] ProductCreateDto dto)
    {
        // 業(yè)務(wù)邏輯
        return CreatedAtAction(nameof(GetProduct), new { id = 1 }, null);
    }
}

6. 模型驗(yàn)證示例

public class ProductCreateDto
{
    [Required]
    [StringLength(100)]
    public string Name { get; set; }

    [Range(0, 10000)]
    public decimal Price { get; set; }
}

public class ValidateModelAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext context)
    {
        if (!context.ModelState.IsValid)
        {
            var errors = context.ModelState
                .Where(e => e.Value.Errors.Count > 0)
                .ToDictionary(
                    kvp => kvp.Key,
                    kvp => kvp.Value.Errors.Select(e => e.ErrorMessage).ToArray()
                );
            
            context.Result = new BadRequestObjectResult(
                ApiResponse<object>.Error(400, "Validation Error", errors)
            );
        }
    }
}

四、運(yùn)行效果示例

成功響應(yīng)

{
  "code": 200,
  "message": "Success",
  "data": {
    "id": 1,
    "name": "Sample Product"
  },
  "timestamp": "2024-02-20T12:34:56Z"
}

錯誤響應(yīng)

{
  "code": 400,
  "message": "Validation Error",
  "data": {
    "Price": ["The field Price must be between 0 and 10000."]
  },
  "timestamp": "2024-02-20T12:35:10Z"
}

五、擴(kuò)展建議

  1. 性能優(yōu)化：添加響應(yīng)緩存機(jī)制
  2. 監(jiān)控：集成 Application Insights
  3. 限流：使用 AspNetCoreRateLimit
  4. DTO 映射：使用 AutoMapper
  5. 單元測試：使用 xUnit/MSTest

此方案提供了從基礎(chǔ)設(shè)施到業(yè)務(wù)邏輯的完整統(tǒng)一 API 實(shí)現(xiàn)框架，可根據(jù)具體需求進(jìn)行擴(kuò)展調(diào)整。

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