头部电商案例拆解：高效化退货系统实现退货成本降低 20%

// 退货服务接口定义示例
public interface IReturnService
{
    Task ValidateReturnRequest(ReturnRequest request);
    Task ProcessReturn(ReturnProcessingData data);
    Task ProcessRefund(RefundRequest request);
}

// 使用依赖注入注册服务
services.AddScoped();
services.AddScoped();
services.AddScoped();

// 智能退货验证逻辑
class ReturnValidator {
  constructor() {
    this.policies = new ReturnPolicies();
    this.historyAnalyzer = new ReturnHistoryAnalyzer();
  }

  async validateReturn(request) {
    // 验证购买真实性
    const purchaseValid = await this.validatePurchase(request.orderId);
    
    // 检查退货时间窗口
    const timeValid = this.policies.checkReturnTimeWindow(request.purchaseDate);
    
    // 分析历史退货模式
    const historyScore = await this.historyAnalyzer.analyzeUserHistory(request.userId);
    
    return {
      eligible: purchaseValid && timeValid,
      confidenceScore: historyScore,
      suggestedSolution: this.generateSolution(request, historyScore)
    };
  }
}

// 退货数据分析服务
public class ReturnAnalyticsService
{
    private readonly DbContext _context;
    
    public async Task AnalyzeReturnPatterns(DateTime startDate, DateTime endDate)
    {
        var returns = await _context.Returns
            .Where(r => r.ReturnDate >= startDate && r.ReturnDate <= endDate)
            .Include(r => r.Product)
            .Include(r => r.User)
            .ToListAsync();

        // 计算各类退货原因占比
        var reasonAnalysis = returns
            .GroupBy(r => r.Reason)
            .Select(g => new { Reason = g.Key, Count = g.Count(), Percentage = (double)g.Count() / returns.Count })
            .OrderByDescending(x => x.Count);
            
        return new ReturnAnalysisResult {
            TotalReturns = returns.Count,
            ReasonBreakdown = reasonAnalysis,
            CostAnalysis = await CalculateCostSavings(returns)
        };
    }
}