智能电子审批系统底层逻辑：流程自动化、规则引擎、数据联动技术支撑解析

// 审批流程状态机示例
public class ApprovalWorkflow
{
    public ApprovalStatus CurrentStatus { get; private set; }
    
    public void Submit()
    {
        if (CurrentStatus == ApprovalStatus.Draft)
            CurrentStatus = ApprovalStatus.PendingReview;
    }
    
    public void Approve(int approverId)
    {
        if (CurrentStatus == ApprovalStatus.PendingReview)
            CurrentStatus = ApprovalStatus.Approved;
    }
    
    public void Reject(string reason)
    {
        if (CurrentStatus == ApprovalStatus.PendingReview)
            CurrentStatus = ApprovalStatus.Rejected;
    }
}

public enum ApprovalStatus
{
    Draft,
    PendingReview,
    Approved,
    Rejected
}

// 规则引擎示例 - 审批规则验证
class ApprovalRuleEngine {
  constructor(rules) {
    this.rules = rules;
  }
  
  evaluate(request) {
    for (const rule of this.rules) {
      const result = rule.condition(request);
      if (result) {
        return rule.action(request);
      }
    }
    return { approved: false, reason: 'No matching rule' };
  }
}

// 示例规则配置
const financialRules = [
  {
    condition: (req) => req.amount <= 5000,
    action: (req) => ({ approved: true, level: '自动审批' })
  },
  {
    condition: (req) => req.amount > 5000 && req.amount <= 20000,
    action: (req) => ({ approved: null, level: '需经理审批' })
  }
];

// 数据联动示例 - 预算检查服务
public class BudgetValidationService
{
    private readonly IFinanceApiClient _financeClient;
    
    public BudgetValidationService(IFinanceApiClient financeClient)
    {
        _financeClient = financeClient;
    }
    
    public async Task ValidateBudgetAsync(int departmentId, decimal amount)
    {
        // 实时获取部门预算信息
        var budgetInfo = await _financeClient.GetDepartmentBudgetAsync(departmentId);
        
        if (budgetInfo.RemainingAmount >= amount)
        {
            return new ValidationResult 
            { 
                IsValid = true, 
                Message = "预算充足" 
            };
        }
        else
        {
            return new ValidationResult 
            { 
                IsValid = false, 
                Message = $"预算不足，剩余预算：{budgetInfo.RemainingAmount}" 
            };
        }
    }
}

public class ValidationResult
{
    public bool IsValid { get; set; }
    public string Message { get; set; }
}