前一篇文章介绍MasterMemory，这个组件讨论的网友挺多了，有网友单独问我，说想用这个替换sqlite，我肯定是不支持的，虽然官方对比sqlite的性能与存储提示不少，但绝对不是db的读取逻辑。所以有了这篇文章，按网友说他现在30w数据在sqlite中大该150M，我模拟写了以下程序，试了一下，30万条设备数据，复杂的多维度筛选，用户输入关键词的瞬间就能看到结果。至于大家用在什么场景还是自己拿主义了。

作为C#开发者，你是否遇到过这些痛点：

数据库查询慢如蜗牛，用户体验糟糕
复杂的索引设计让人头疼
高并发下数据库压力山大

MasterMemory 优点

🚀 性能优势

毫秒级查询响应：30万数据查询速度<1ms，比传统数据库快200-500倍
零序列化开销：直接操作C#对象，无需序列化/反序列化过程，这个优势还是明显的。
预构建索引：启动时一次性构建所有索引，查询时直接使用
内存查询：避免磁盘I/O瓶颈，全内存操作
基本是source code 预编译的，这个可以看我以住的这个系列，算是写的比较清楚了。

💻 开发优势

类型安全：编译时检查，运行时高效，避免SQL语句错误。
强类型支持：原生C#对象操作，智能提示完整
复合索引支持：支持多字段联合索引，优化复杂查询
线程安全：只读特性天然保证线程安全

🔧 技术优势

支持复杂查询：范围查询、多条件筛选、模糊搜索等
高并发友好：避免数据库连接池压力
序列化持久化：支持二进制序列化保存到磁盘

MasterMemory 缺点

📝 功能限制

只读特性：数据更新需要重建整个数据库实例，不支持实时增删改，你想用这个替换db需要考虑的东西就多了，要是有时间我可以试试扩展一下它的写。
内存占用：30万数据约占用50-100MB内存，大数据集内存压力大
数据一致性：更新时需要全量重建，存在数据一致性时间窗口

🔧 技术限制

学习成本：需要掌握MessagePack序列化、索引设计等概念
过多索引开销：索引数量过多会增加内存占用和构建时间
依赖管理：需要额外引入MessagePack等第三方包

💾 存储限制

内存依赖：所有数据必须能装入内存
持久化复杂：数据持久化需要额外的序列化/反序列化逻辑
版本管理：数据结构变更时需要考虑兼容性问题

官方性能对比图

💡 问题分析：传统方案的致命弱点

🔍 传统数据库查询的瓶颈

C#
// 传统方式：每次查询都要访问数据库
var result = dbContext.Equipment
    .Where(e => e.Status == EquipmentStatus.Running)
    .Where(e => e.Zone == selectedZone)
    .ToList(); // 耗时：100-500ms

问题显而易见：

磁盘I/O成为性能杀手
复杂查询需要多次数据库往返
高并发下连接池资源紧张

🛠️ 核心技术方案

📊 数据模型设计

C#
[MemoryTable("equipment"), MessagePackObject(true)]
public record Equipment
{
    [PrimaryKey]
    public required int EquipmentId { get; init; }
    
    [SecondaryKey(0)]
    public required string EquipmentCode { get; init; }
    
    // 复合索引：区域+功率等级
    [SecondaryKey(1, keyOrder: 0), NonUnique]
    public required FactoryZone Zone { get; init; }
    
    [SecondaryKey(1, keyOrder: 1), NonUnique]
    public required int PowerLevel { get; init; }
    
    [SecondaryKey(2), NonUnique]
    public required EquipmentStatus Status { get; init; }
    
    public required string Name { get; init; }
    public required double Temperature { get; init; }
    // ... 其他字段
}

🔥 设计亮点：

record类型确保不可变性和高性能
多重索引支持复杂查询场景
复合索引优化区域+功率联合查询

⚡ 高性能服务层

C#
public class EquipmentService
{
    private MemoryDatabase _database;
    
    // 🚀 毫秒级状态查询
    public IEnumerable<Equipment> GetEquipmentByStatus(EquipmentStatus status)
    {
        return _database.EquipmentTable.FindByStatus(status);
    }
    
    // 🔍 复合索引查询：区域+功率
    public IEnumerable<Equipment> GetEquipmentByZoneAndPower(
        FactoryZone zone, int powerLevel)
    {
        return _database.EquipmentTable
            .FindByZoneAndPowerLevel((zone, powerLevel));
    }
    
    // 📈 范围查询优化
    public IEnumerable<Equipment> GetByPowerRange(int min, int max)
    {
        return _database.EquipmentTable
            .FindRangeByPowerLevel(min, max);
    }
}

🎯 实战案例：工业设备管理系统

🏭 业务场景

构建一个管理30万台工业设备的实时监控系统：

6种设备类型（电机、泵、阀门等）
6个工厂区域
4种运行状态
实时温度、压力、振动监控

💾 数据持久化方案

C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using AppMasterMemoryTest.Models;

namespace AppMasterMemoryTest.Services
{
    public class DataPersistenceService
    {
        private readonly string _dataDirectory;
        private readonly string _databasePath;
        private readonly Random _random;

        public DataPersistenceService(string dataDirectory = "Data")
        {
            _dataDirectory = dataDirectory;
            _databasePath = Path.Combine(_dataDirectory, "equipment_database.bin");
            _random = new Random();

            // 确保数据目录存在
            if (!Directory.Exists(_dataDirectory))
            {
                Directory.CreateDirectory(_dataDirectory);
            }
        }

        /// <summary>
        /// 保存数据库到文件
        /// </summary>
        public async Task SaveDatabaseAsync(MemoryDatabase database)
        {
            try
            {
                // 获取数据库的二进制数据
                var builder = new DatabaseBuilder();
                builder.Append(database.EquipmentTable.All.ToArray());
                byte[] databaseBinary = builder.Build();

                // 异步写入文件
                await File.WriteAllBytesAsync(_databasePath, databaseBinary);
            }
            catch (Exception ex)
            {
                throw new InvalidOperationException($"保存数据库失败: {ex.Message}", ex);
            }
        }

        /// <summary>
        /// 从文件加载数据库
        /// </summary>
        public async Task<MemoryDatabase> LoadDatabaseAsync()
        {
            try
            {
                if (!File.Exists(_databasePath))
                {
                    throw new FileNotFoundException("数据库文件不存在");
                }

                // 异步读取文件
                byte[] databaseBinary = await File.ReadAllBytesAsync(_databasePath);
                return new MemoryDatabase(databaseBinary);
            }
            catch (Exception ex)
            {
                throw new InvalidOperationException($"加载数据库失败: {ex.Message}", ex);
            }
        }

        /// <summary>
        /// 检查数据库文件是否存在
        /// </summary>
        public bool DatabaseExists()
        {
            return File.Exists(_databasePath);
        }

        /// <summary>
        /// 获取数据库文件大小（MB）
        /// </summary>
        public double GetDatabaseSize()
        {
            if (!File.Exists(_databasePath))
                return 0;

            var fileInfo = new FileInfo(_databasePath);
            return fileInfo.Length / (1024.0 * 1024.0);
        }

        /// <summary>
        /// 生成测试数据
        /// </summary>
        public async Task<MemoryDatabase> GenerateTestDataAsync(int count = 300000)
        {
            var equipment = new List<Equipment>();

            var manufacturers = new[] { "西门子", "ABB", "施耐德", "三菱", "欧姆龙", "霍尼韦尔", "艾默生", "罗克韦尔" };
            var equipmentTypes = Enum.GetValues<EquipmentType>();
            var statuses = Enum.GetValues<EquipmentStatus>();
            var zones = Enum.GetValues<FactoryZone>();

            return await Task.Run(() =>
            {
                for (int i = 0; i < count; i++)
                {
                    var type = equipmentTypes[_random.Next(equipmentTypes.Length)];
                    var status = statuses[_random.Next(statuses.Length)];
                    var zone = zones[_random.Next(zones.Length)];
                    var manufacturer = manufacturers[_random.Next(manufacturers.Length)];

                    var installDate = DateTime.Now.AddDays(-_random.Next(1, 3650)); // 1-10年前安装
                    var lastMaintenance = installDate.AddDays(_random.Next(1, (DateTime.Now - installDate).Days));

                    equipment.Add(new Equipment
                    {
                        EquipmentId = i,
                        EquipmentCode = $"{GetZoneCode(zone)}-{GetTypeCode(type)}-{i:D6}",
                        Name = $"{GetTypeName(type)}-{i:D4}",
                        Type = type,
                        Status = status,
                        Zone = zone,
                        PowerLevel = _random.Next(1, 1001), // 1-1000kW
                        Manufacturer = manufacturer,
                        Model = $"Model-{type}-{_random.Next(100, 999)}",
                        InstallDate = installDate,
                        LastMaintenanceDate = lastMaintenance,
                        OperatingHours = _random.NextDouble() * 50000, // 0-50000小时
                        Temperature = GenerateRealisticTemperature(status),
                        Pressure = GenerateRealisticPressure(type),
                        Vibration = GenerateRealisticVibration(status),
                        Remarks = _random.Next(10) < 2 ? GenerateRandomRemark() : null // 20%概率有备注
                    });

                    // 每10000条数据报告一次进度
                    if (i % 10000 == 0 && i > 0)
                    {
                        // 这里可以添加进度报告逻辑
                    }
                }

                var builder = new DatabaseBuilder();
                builder.Append(equipment.ToArray());
                byte[] databaseBinary = builder.Build();
                return new MemoryDatabase(databaseBinary);
            });
        }

        /// <summary>
        /// 导出数据到CSV文件
        /// </summary>
        public async Task ExportToCsvAsync(MemoryDatabase database, string filePath)
        {
            var equipment = database.EquipmentTable.All.ToList();
            var lines = new List<string>
            {
                "设备ID,设备编号,设备名称,设备类型,设备状态,工厂区域,功率等级,制造商,型号,安装日期,最后维护日期,运行小时数,温度,压力,振动值,备注"
            };

            lines.AddRange(equipment.Select(e =>
                $"{e.EquipmentId},{e.EquipmentCode},{e.Name},{GetTypeName(e.Type)},{GetStatusName(e.Status)}," +
                $"{GetZoneName(e.Zone)},{e.PowerLevel},{e.Manufacturer},{e.Model}," +
                $"{e.InstallDate:yyyy-MM-dd},{e.LastMaintenanceDate:yyyy-MM-dd}," +
                $"{e.OperatingHours:F1},{e.Temperature:F1},{e.Pressure:F1},{e.Vibration:F2},{e.Remarks ?? ""}"));

            await File.WriteAllLinesAsync(filePath, lines, System.Text.Encoding.UTF8);
        }

        #region 私有辅助方法

        private string GetZoneCode(FactoryZone zone) => zone switch
        {
            FactoryZone.ProductionLineA => "PLA",
            FactoryZone.ProductionLineB => "PLB",
            FactoryZone.ProductionLineC => "PLC",
            FactoryZone.Warehouse => "WH",
            FactoryZone.QualityControl => "QC",
            FactoryZone.Maintenance => "MNT",
            _ => "UNK"
        };

        private string GetTypeCode(EquipmentType type) => type switch
        {
            EquipmentType.Motor => "MOT",
            EquipmentType.Pump => "PMP",
            EquipmentType.Valve => "VLV",
            EquipmentType.Sensor => "SNR",
            EquipmentType.Controller => "CTR",
            EquipmentType.Conveyor => "CNV",
            _ => "UNK"
        };

        private string GetTypeName(EquipmentType type) => type switch
        {
            EquipmentType.Motor => "电机",
            EquipmentType.Pump => "泵",
            EquipmentType.Valve => "阀门",
            EquipmentType.Sensor => "传感器",
            EquipmentType.Controller => "控制器",
            EquipmentType.Conveyor => "输送带",
            _ => "未知"
        };

        private string GetStatusName(EquipmentStatus status) => status switch
        {
            EquipmentStatus.Running => "运行中",
            EquipmentStatus.Stopped => "停止",
            EquipmentStatus.Maintenance => "维护中",
            EquipmentStatus.Fault => "故障",
            _ => "未知"
        };

        private string GetZoneName(FactoryZone zone) => zone switch
        {
            FactoryZone.ProductionLineA => "生产线A",
            FactoryZone.ProductionLineB => "生产线B",
            FactoryZone.ProductionLineC => "生产线C",
            FactoryZone.Warehouse => "仓库",
            FactoryZone.QualityControl => "质检区",
            FactoryZone.Maintenance => "维护区",
            _ => "未知"
        };

        private double GenerateRealisticTemperature(EquipmentStatus status)
        {
            return status switch
            {
                EquipmentStatus.Running => _random.NextDouble() * 30 + 40, 
                EquipmentStatus.Fault => _random.NextDouble() * 50 + 70,
                EquipmentStatus.Maintenance => _random.NextDouble() * 10 + 20,
                EquipmentStatus.Stopped => _random.NextDouble() * 10 + 20, 
                _ => _random.NextDouble() * 20 + 30  
            };
        }

        private double GenerateRealisticPressure(EquipmentType type)
        {
            return type switch
            {
                EquipmentType.Pump => _random.NextDouble() * 15 + 5,  
                EquipmentType.Valve => _random.NextDouble() * 10 + 3, 
                EquipmentType.Motor => _random.NextDouble() * 2 + 1, 
                EquipmentType.Controller => _random.NextDouble() * 1 + 0.5, 
                _ => _random.NextDouble() * 8 + 2 
            };
        }

        private double GenerateRealisticVibration(EquipmentStatus status)
        {
            return status switch
            {
                EquipmentStatus.Running => _random.NextDouble() * 2 + 0.5,   
                EquipmentStatus.Fault => _random.NextDouble() * 10 + 5,      
                EquipmentStatus.Maintenance => _random.NextDouble() * 0.5,  
                EquipmentStatus.Stopped => _random.NextDouble() * 0.2, 
                _ => _random.NextDouble() * 3 + 1                        
            };
        }

        private string GenerateRandomRemark()
        {
            var remarks = new[]
            {
                "运行正常，性能良好",
                "需要定期润滑保养",
                "轴承噪声略高，建议检查",
                "温度稍高，已加强冷却",
                "振动值在正常范围内",
                "最近更换了密封件",
                "电流消耗正常",
                "待下次维护时更换滤芯",
                "压力传感器校准完成",
                "控制程序已更新"
            };
            return remarks[_random.Next(remarks.Length)];
        }

        #endregion
    }
}

🖥️ WinForm界面集成

C#
using System.ComponentModel;
using System.Linq;
using AppMasterMemoryTest.Models;
using AppMasterMemoryTest.Services;

namespace AppMasterMemoryTest
{
    public partial class FrmMain : Form
    {
        private EquipmentService? _equipmentService;
        private DataPersistenceService _dataPersistenceService;
        private MemoryDatabase? _database;
        private BindingList<Equipment> _displayData;
        public FrmMain()
        {
            InitializeComponent();
            _dataPersistenceService = new DataPersistenceService();
            _displayData = new BindingList<Equipment>();
            InitializeControls();
            UpdateStatusBar();
        }

        private void InitializeControls()
        {
            InitializeFilterControls();
            dgvEquipment.DataSource = _displayData;
            SetupDataGridViewColumns();

            if (_dataPersistenceService.DatabaseExists())
            {
                tslStatus.Text = "发现现有数据库文件，请选择加载数据";
            }
            else
            {
                tslStatus.Text = "未找到数据库文件，请生成测试数据或加载数据";
            }
        }

        private void InitializeFilterControls()
        {
            cmbType.Items.Add("全部");
            cmbType.Items.AddRange(Enum.GetNames<EquipmentType>().Select(name => GetTypeName(Enum.Parse<EquipmentType>(name))).ToArray());
            cmbType.SelectedIndex = 0;
            cmbStatus.Items.Add("全部");
            cmbStatus.Items.AddRange(Enum.GetNames<EquipmentStatus>().Select(name => GetStatusName(Enum.Parse<EquipmentStatus>(name))).ToArray());
            cmbStatus.SelectedIndex = 0;
            cmbZone.Items.Add("全部");
            cmbZone.Items.AddRange(Enum.GetNames<FactoryZone>().Select(name => GetZoneName(Enum.Parse<FactoryZone>(name))).ToArray());
            cmbZone.SelectedIndex = 0;
        }

        private void SetupDataGridViewColumns()
        {
            dgvEquipment.AutoGenerateColumns = false;
            dgvEquipment.Columns.Clear();

            // 创建绑定列
            var colEquipmentId = new DataGridViewTextBoxColumn();
            colEquipmentId.Name = "EquipmentId";
            colEquipmentId.HeaderText = "设备ID";
            colEquipmentId.DataPropertyName = "EquipmentId";
            colEquipmentId.Width = 80;
            colEquipmentId.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            dgvEquipment.Columns.Add(colEquipmentId);

            var colEquipmentCode = new DataGridViewTextBoxColumn();
            colEquipmentCode.Name = "EquipmentCode";
            colEquipmentCode.HeaderText = "设备编号";
            colEquipmentCode.DataPropertyName = "EquipmentCode";
            colEquipmentCode.Width = 120;
            dgvEquipment.Columns.Add(colEquipmentCode);

            var colName = new DataGridViewTextBoxColumn();
            colName.Name = "Name";
            colName.HeaderText = "设备名称";
            colName.DataPropertyName = "Name";
            colName.Width = 120;
            dgvEquipment.Columns.Add(colName);

            var colType = new DataGridViewTextBoxColumn();
            colType.Name = "Type";
            colType.HeaderText = "设备类型";
            colType.DataPropertyName = "Type";
            colType.Width = 80;
            dgvEquipment.Columns.Add(colType);

            var colStatus = new DataGridViewTextBoxColumn();
            colStatus.Name = "Status";
            colStatus.HeaderText = "设备状态";
            colStatus.DataPropertyName = "Status";
            colStatus.Width = 80;
            dgvEquipment.Columns.Add(colStatus);

            var colZone = new DataGridViewTextBoxColumn();
            colZone.Name = "Zone";
            colZone.HeaderText = "工厂区域";
            colZone.DataPropertyName = "Zone";
            colZone.Width = 100;
            dgvEquipment.Columns.Add(colZone);

            var colPowerLevel = new DataGridViewTextBoxColumn();
            colPowerLevel.Name = "PowerLevel";
            colPowerLevel.HeaderText = "功率等级(kW)";
            colPowerLevel.DataPropertyName = "PowerLevel";
            colPowerLevel.Width = 90;
            colPowerLevel.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
            dgvEquipment.Columns.Add(colPowerLevel);

            var colManufacturer = new DataGridViewTextBoxColumn();
            colManufacturer.Name = "Manufacturer";
            colManufacturer.HeaderText = "制造商";
            colManufacturer.DataPropertyName = "Manufacturer";
            colManufacturer.Width = 100;
            dgvEquipment.Columns.Add(colManufacturer);

            var colModel = new DataGridViewTextBoxColumn();
            colModel.Name = "Model";
            colModel.HeaderText = "型号";
            colModel.DataPropertyName = "Model";
            colModel.Width = 120;
            dgvEquipment.Columns.Add(colModel);

            var colTemperature = new DataGridViewTextBoxColumn();
            colTemperature.Name = "Temperature";
            colTemperature.HeaderText = "温度(°C)";
            colTemperature.DataPropertyName = "Temperature";
            colTemperature.Width = 80;
            colTemperature.DefaultCellStyle.Format = "F1";
            colTemperature.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
            dgvEquipment.Columns.Add(colTemperature);

            var colPressure = new DataGridViewTextBoxColumn();
            colPressure.Name = "Pressure";
            colPressure.HeaderText = "压力(bar)";
            colPressure.DataPropertyName = "Pressure";
            colPressure.Width = 80;
            colPressure.DefaultCellStyle.Format = "F1";
            colPressure.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
            dgvEquipment.Columns.Add(colPressure);

            var colVibration = new DataGridViewTextBoxColumn();
            colVibration.Name = "Vibration";
            colVibration.HeaderText = "振动(mm/s)";
            colVibration.DataPropertyName = "Vibration";
            colVibration.Width = 80;
            colVibration.DefaultCellStyle.Format = "F2";
            colVibration.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
            dgvEquipment.Columns.Add(colVibration);

            var colOperatingHours = new DataGridViewTextBoxColumn();
            colOperatingHours.Name = "OperatingHours";
            colOperatingHours.HeaderText = "运行小时数";
            colOperatingHours.DataPropertyName = "OperatingHours";
            colOperatingHours.Width = 100;
            colOperatingHours.DefaultCellStyle.Format = "F1";
            colOperatingHours.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight;
            dgvEquipment.Columns.Add(colOperatingHours);
        }

        private void RefreshData()
        {
            if (_equipmentService == null) return;

            try
            {
                var filteredData = ApplyFilters();

                // 为了性能考虑，限制显示的记录数量
                var displayData = filteredData.Take(10000).Select(equipment => new
                {
                    equipment.EquipmentId,
                    equipment.EquipmentCode,
                    equipment.Name,
                    Type = GetTypeName(equipment.Type),
                    Status = GetStatusName(equipment.Status),
                    Zone = GetZoneName(equipment.Zone),
                    equipment.PowerLevel,
                    equipment.Manufacturer,
                    equipment.Model,
                    equipment.Temperature,
                    equipment.Pressure,
                    equipment.Vibration,
                    equipment.OperatingHours
                }).ToList();

                // 设置数据源
                dgvEquipment.DataSource = displayData;

                UpdateStatusBar();
                var totalFiltered = filteredData.Count();
                var displayed = displayData.Count;

                if (totalFiltered > 10000)
                {
                    tslStatus.Text = $"数据刷新完成，筛选出 {totalFiltered:N0} 条记录，显示前 {displayed:N0} 条";
                }
                else
                {
                    tslStatus.Text = $"数据刷新完成，显示 {displayed:N0} 条记录";
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show($"刷新数据时发生错误: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                tslStatus.Text = "数据刷新失败";
            }
        }

        private IEnumerable<Equipment> ApplyFilters()
        {
            if (_equipmentService == null) return Enumerable.Empty<Equipment>();

            // 获取筛选条件
            var keyword = txtSearch.Text.Trim();
            var selectedType = cmbType.SelectedIndex > 0 ? (EquipmentType?)Enum.GetValues<EquipmentType>()[cmbType.SelectedIndex - 1] : null;
            var selectedStatus = cmbStatus.SelectedIndex > 0 ? (EquipmentStatus?)Enum.GetValues<EquipmentStatus>()[cmbStatus.SelectedIndex - 1] : null;
            var selectedZone = cmbZone.SelectedIndex > 0 ? (FactoryZone?)Enum.GetValues<FactoryZone>()[cmbZone.SelectedIndex - 1] : null;
            var manufacturer = txtManufacturer.Text.Trim();
            var minPower = nudMinPower.Value > 0 ? (int)nudMinPower.Value : (int?)null;
            var maxPower = nudMaxPower.Value < 1000 ? (int)nudMaxPower.Value : (int?)null;

            // 应用筛选
            var result = _equipmentService.FilterEquipment(
                type: selectedType,
                status: selectedStatus,
                zone: selectedZone,
                manufacturer: string.IsNullOrEmpty(manufacturer) ? null : manufacturer,
                minPowerLevel: minPower,
                maxPowerLevel: maxPower
            );

            // 关键词搜索
            if (!string.IsNullOrEmpty(keyword))
            {
                result = _equipmentService.SearchEquipment(keyword)
                    .Intersect(result, new EquipmentComparer());
            }

            return result.OrderBy(e => e.EquipmentId);
        }
        private void UpdateStatusBar()
        {
            if (_equipmentService != null)
            {
                var totalCount = _equipmentService.GetAllEquipment().Count();
                tslRecordCount.Text = $"记录数: {totalCount:N0}";
            }
            else
            {
                tslRecordCount.Text = "记录数: 0";
            }

            var dbSize = _dataPersistenceService.GetDatabaseSize();
            tslDatabaseSize.Text = $"数据库大小: {dbSize:F2} MB";
        }
        private void RefreshStatistics()
        {
            if (_equipmentService == null)
            {
                rtbStatistics.Text = "暂无数据";
                return;
            }

            try
            {
                var stats = _equipmentService.GetStatistics();
                var typeStats = _equipmentService.GetTypeStatistics().ToList();
                var zoneStats = _equipmentService.GetZoneStatistics().ToList();

                var text = $@"
═══════════════════════════════════════════════════════════════════
                          设备统计信息总览
═══════════════════════════════════════════════════════════════════

📊 总体统计
───────────────────────────────────────────────────────────────────
总设备数量:        {stats.TotalEquipment:N0} 台
运行中设备:        {stats.RunningEquipment:N0} 台 ({(double)stats.RunningEquipment / stats.TotalEquipment * 100:F1}%)
停止设备:          {stats.StoppedEquipment:N0} 台 ({(double)stats.StoppedEquipment / stats.TotalEquipment * 100:F1}%)
维护中设备:        {stats.MaintenanceEquipment:N0} 台 ({(double)stats.MaintenanceEquipment / stats.TotalEquipment * 100:F1}%)
故障设备:          {stats.FaultEquipment:N0} 台 ({(double)stats.FaultEquipment / stats.TotalEquipment * 100:F1}%)

⚡ 运行参数统计
───────────────────────────────────────────────────────────────────
平均运行小时数:    {stats.AverageOperatingHours:F1} 小时
平均温度:          {stats.AverageTemperature:F1} °C
平均压力:          {stats.AveragePressure:F1} bar
平均振动值:        {stats.AverageVibration:F2} mm/s

🏆 极值设备
───────────────────────────────────────────────────────────────────
最高运行小时数:    {stats.HighestOperatingHoursEquipment?.Name} ({stats.HighestOperatingHoursEquipment?.OperatingHours:F1} 小时)
最高温度设备:      {stats.HighestTemperatureEquipment?.Name} ({stats.HighestTemperatureEquipment?.Temperature:F1} °C)

🔧 设备类型分布
───────────────────────────────────────────────────────────────────
";

                foreach (var typeStat in typeStats)
                {
                    text += $"{GetTypeName(typeStat.Type),-10}: {typeStat.Count,6:N0} 台  运行: {typeStat.RunningCount,6:N0} 台  故障率: {typeStat.FaultRate,5:F1}%\n";
                }

                text += @"
🏭 工厂区域分布
───────────────────────────────────────────────────────────────────
";

                foreach (var zoneStat in zoneStats)
                {
                    text += $"{GetZoneName(zoneStat.Zone),-12}: {zoneStat.EquipmentCount,4:N0} 台  平均温度: {zoneStat.AverageTemperature,5:F1}°C  故障数: {zoneStat.FaultCount,3} 台\n";
                }

                text += @"
───────────────────────────────────────────────────────────────────
报告生成时间: " + DateTime.Now.ToString("yyyy年MM月dd日 HH:mm:ss");

                rtbStatistics.Text = text;

                // 设置颜色
                rtbStatistics.SelectAll();
                rtbStatistics.SelectionColor = Color.FromArgb(64, 64, 64);
                rtbStatistics.SelectionStart = 0;
                rtbStatistics.SelectionLength = 0;
            }
            catch (Exception ex)
            {
                rtbStatistics.Text = $"生成统计信息时发生错误: {ex.Message}";
            }
        }

        #region 事件处理

        private async void btnGenerate_Click(object sender, EventArgs e)
        {
            var result = MessageBox.Show(
                "将生成30万条测试数据，这可能需要几分钟时间。是否继续？",
                "确认生成数据",
                MessageBoxButtons.YesNo,
                MessageBoxIcon.Question);

            if (result != DialogResult.Yes) return;

            try
            {
                this.Enabled = false;
                tslStatus.Text = "正在生成测试数据，请稍候...";

                _database = await _dataPersistenceService.GenerateTestDataAsync(300000);
                _equipmentService = new EquipmentService(_database);

                tslStatus.Text = "测试数据生成完成";
                RefreshData();
                RefreshStatistics();

                MessageBox.Show("30万条测试数据生成完成！", "完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show($"生成测试数据失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                tslStatus.Text = "生成测试数据失败";
            }
            finally
            {
                this.Enabled = true;
            }
        }
        private async void btnLoad_Click(object sender, EventArgs e)
        {
            try
            {
                this.Enabled = false;
                tslStatus.Text = "正在加载数据，请稍候...";

                _database = await _dataPersistenceService.LoadDatabaseAsync();
                _equipmentService = new EquipmentService(_database);

                tslStatus.Text = "数据加载完成";
                RefreshData();
                RefreshStatistics();

                MessageBox.Show("数据加载完成！", "完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show($"加载数据失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                tslStatus.Text = "加载数据失败";
            }
            finally
            {
                this.Enabled = true;
            }
        }
        private async void btnSave_Click(object sender, EventArgs e)
        {
            if (_database == null)
            {
                MessageBox.Show("当前没有数据可保存", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            try
            {
                this.Enabled = false;
                tslStatus.Text = "正在保存数据，请稍候...";

                await _dataPersistenceService.SaveDatabaseAsync(_database);

                tslStatus.Text = "数据保存完成";
                UpdateStatusBar();

                MessageBox.Show("数据保存完成！", "完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show($"保存数据失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                tslStatus.Text = "保存数据失败";
            }
            finally
            {
                this.Enabled = true;
            }
        }

        private async void btnExport_Click(object sender, EventArgs e)
        {
            if (_database == null)
            {
                MessageBox.Show("当前没有数据可导出", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            using (var saveDialog = new SaveFileDialog())
            {
                saveDialog.Filter = "CSV文件|*.csv";
                saveDialog.Title = "导出设备数据";
                saveDialog.FileName = $"设备数据_{DateTime.Now:yyyyMMdd_HHmmss}.csv";

                if (saveDialog.ShowDialog() == DialogResult.OK)
                {
                    try
                    {
                        this.Enabled = false;
                        tslStatus.Text = "正在导出数据，请稍候...";

                        await _dataPersistenceService.ExportToCsvAsync(_database, saveDialog.FileName);

                        tslStatus.Text = "数据导出完成";
                        MessageBox.Show($"数据已导出到: {saveDialog.FileName}", "完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show($"导出数据失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        tslStatus.Text = "导出数据失败";
                    }
                    finally
                    {
                        this.Enabled = true;
                    }
                }
            }
        }

        private void btnRefresh_Click(object sender, EventArgs e)
        {
            RefreshData();
            RefreshStatistics();
            tslStatus.Text = "数据已刷新";
        }
        private void btnStatistics_Click(object sender, EventArgs e)
        {
            tabMain.SelectedTab = tpStatistics;
            RefreshStatistics();
        }
        private void btnClearFilter_Click(object sender, EventArgs e)
        {
            txtSearch.Clear();
            txtManufacturer.Clear();
            cmbType.SelectedIndex = 0;
            cmbStatus.SelectedIndex = 0;
            cmbZone.SelectedIndex = 0;
            nudMinPower.Value = 0;
            nudMaxPower.Value = 1000;
            RefreshData();
        }
        private void txtSearch_TextChanged(object sender, EventArgs e)
        {
            RefreshData();
        }
        private void Filter_Changed(object sender, EventArgs e)
        {
            RefreshData();
        }

        #endregion

        #region 辅助方法

        private string GetTypeName(EquipmentType type) => type switch
        {
            EquipmentType.Motor => "电机",
            EquipmentType.Pump => "泵",
            EquipmentType.Valve => "阀门",
            EquipmentType.Sensor => "传感器",
            EquipmentType.Controller => "控制器",
            EquipmentType.Conveyor => "输送带",
            _ => "未知"
        };

        private string GetStatusName(EquipmentStatus status) => status switch
        {
            EquipmentStatus.Running => "运行中",
            EquipmentStatus.Stopped => "停止",
            EquipmentStatus.Maintenance => "维护中",
            EquipmentStatus.Fault => "故障",
            _ => "未知"
        };

        private string GetZoneName(FactoryZone zone) => zone switch
        {
            FactoryZone.ProductionLineA => "生产线A",
            FactoryZone.ProductionLineB => "生产线B",
            FactoryZone.ProductionLineC => "生产线C",
            FactoryZone.Warehouse => "仓库",
            FactoryZone.QualityControl => "质检区",
            FactoryZone.Maintenance => "维护区",
            _ => "未知"
        };

        private class EquipmentComparer : IEqualityComparer<Equipment>
        {
            public bool Equals(Equipment? x, Equipment? y)
            {
                return x?.EquipmentId == y?.EquipmentId;
            }

            public int GetHashCode(Equipment obj)
            {
                return obj.EquipmentId.GetHashCode();
            }
        }

        #endregion
    }
}

🔧 核心技术要点

⚡ 性能优化秘籍

预构建索引：启动时一次性构建所有索引
分页显示：避免一次性渲染大量数据
延迟查询：只有在需要时才执行实际查询

🎯 最佳实践

C#
// ✅ 推荐：使用复合索引
[SecondaryKey(0, keyOrder: 0), NonUnique]
public FactoryZone Zone { get; init; }

[SecondaryKey(0, keyOrder: 1), NonUnique] 
public int PowerLevel { get; init; }

// ❌ 避免：过多的单独索引
// 会增加内存占用和构建时间

🚨 常见坑点提醒

内存管理：30万数据约占用50-100MB内存
线程安全：MasterMemory是只读的，天然线程安全
数据更新：需要重建整个数据库实例

📊 性能对比测试

查询场景	传统数据库	MasterMemory	性能提升
简单筛选	50-200ms	<1ms	200倍
复杂联合查询	200-800ms	1-2ms	400倍
范围查询	100-500ms	<1ms	500倍

🎯 实际应用场景

🏭 工业物联网

设备状态实时监控
故障预警系统
生产线效率分析

📈 数据分析平台

实时报表生成
多维度数据钻取
用户行为分析

🎮 游戏开发

排行榜系统
道具库存管理
玩家数据查询

💡 核心代码模板（收藏级）

🔥 通用查询服务模板

C#
public class GenericQueryService<T> where T : class
{
    private readonly MemoryDatabase _database;
    
    public GenericQueryService(MemoryDatabase database)
    {
        _database = database;
    }
    
    // 🚀 高性能筛选模板
    public IEnumerable<TResult> Query<TResult>(
        Func<T, bool> predicate,
        Func<T, TResult> selector,
        int maxResults = 10000)
    {
        return GetAllData()
            .Where(predicate)
            .Take(maxResults)
            .Select(selector);
    }
    
    protected virtual IEnumerable<T> GetAllData()
    {
        // 子类实现具体的数据获取逻辑
        throw new NotImplementedException();
    }
}

🎊 总结：三个关键收获

🚀 性能革命：MasterMemory让查询速度提升数百倍，用户体验质的飞跃
🛠️ 开发效率：类型安全的C#对象操作，告别复杂的SQL调优
💼 商业价值：高并发场景下的利器，让你的应用在竞争中脱颖而出

记住这句话：在内存为王的时代，谁掌握了高效的内存数据库技术，谁就掌握了性能优化的核心竞争力！

💬 互动时间

你在项目中遇到过哪些查询性能瓶颈？ 欢迎在评论区分享你的痛点！
除了设备管理，你觉得MasterMemory还适合哪些场景？ 期待你的创意想法！

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