Links About Code First

本文详细探讨了 Entity Framework Code First 的工作流程、注解、映射、关系、应用、上下文等核心内容,包括如何使用 DbContext,如何进行数据库初始化与种子数据库操作,以及如何利用 Fluent API 进行数据库映射。文章还特别强调了 Code First 方法在 WinForm 中的应用,以及如何通过 DataAnnotations 实现数据验证,并提供了实际代码示例。

 

一、Workthrough

  1. EF 4.1 Code First Walkthrough (Annotation)
  2. EF Feature CTP5: Code First Walkthrough
  3. Using EF “Code First” with an Existing Database
  4. Code-First Development with Entity Framework 4(重建数据库、初始化数据)
  5. EF 4.1 Model & Database First Walkthrough(数据库—>edmx;edmx—>Pocos)
  6. DbContext in EF 4.1 (DbContext的使用)
  7. EF4.0 and EF4.1 Guide
  8. Vedio Guide
  9. Code First Database Evolution 进化
  10. WinForm中使用Code First
  11. Code First Walkthrough
  12. 关闭Code Frist初始化策略 Database.SetInitializer<SimpleErpDbContext>(null);

二、Annotations

  1. Data Annotations in the Entity Framework and Code First
  2. Code First DataAnnotations (Key,Required,MaxLength and MinLength ,NotMapped, ComplexType, ConcurrencyCheck, TimeStamp ,Table and Column,DatabaseGenerated,Relationship Attributes,InverseProperty, ForeignKey)
  3. Conventions for Code First

三、Fluent API

EF Feature CTP5: Fluent API Samples

四、Mapping

  1. Custom Database Schema Mapping
  2. 创建Mapping的两种思路
  3. Custom Conventions in Entity Framework Code First v 4.1

五、Relationship

  1. Complex Types
  2. Shared Primary Key Associations
  3. Table Splitting
  4. One-to-One Foreign Key Associations
  5. Many-valued Associations
  6. 继承:子父类一个表每一个类一个表每个子类一个表
  7. Relationship Fluent API(Video)

六、Application

  1. Database Initializers(Video)
  2. Seeding a Database
  3. Pluggable Conventions
  4. Validation

七、DbContext

  1. Introduction and Model
  2. Connections and Models
  3. Finding Entities
  4. Add/Attach and Entity States
  5. Working with Property Values
  6. Loading Related Entities
  7. Local Data
  8. Working with Proxies
  9. Optimistic Concurrency Patterns
  10. Raw SQL Queries
  11. Load and AsNoTracking
  12. Automatically Detecting Changes

中文

  1. DbSet.Find()函数的实现
  2. DbSet.Local属性的使用与实现

八、Extensions

  1. Declarative Referential Integrity (DRI)
  2. Cascading Delete
  3. Referential Integrity Refactorings
<think> Hmm, the user is asking about a specific Wi-Fi disassociation reason code (0x0022) that indicates disconnection due to unacknowledged frames. They've previously interacted with Wireshark warnings, suggesting they're likely a network professional troubleshooting wireless issues. The core issue here is TCP-like acknowledgment failures in Wi-Fi - when the access point (AP) can't confirm frame receipts because of either AP overload or bad radio conditions. The user probably needs both technical explanation and practical solutions. Breaking this down: First, the "excessive unacknowledged frames" means client devices sent data but got no ACKs from AP. This happens when (a) AP is too busy transmitting to respond (like during heavy downloads) or (b) signal interference prevents ACKs from being received. The 0x0022 code specifically points to this dual root cause. For mitigation, I should suggest both client-side checks (signal strength, driver updates) and infrastructure improvements (AP placement, channel optimization). Since the user seems technical, including Linux command examples for iwconfig would add value. The related questions should explore deeper technical angles: How Wi-Fi ACK mechanisms differ from TCP, tools to diagnose airtime fairness, hidden node implications, and enterprise-grade solutions beyond basic troubleshooting. The user appears advanced enough for these nuances. Must remember strict formatting: Chinese response followed by "§§相关问题§§" with 3-5 compact questions. No markdown in questions despite the temptation to add links - the constraints prohibit it. </think> 这条Wi-Fi断开连接原因代码(0x0022)的含义是: **技术解析**: 表示设备因**未确认帧数量超过阈值**而被解除关联,核心问题在于: 1. **根本原因**: - 📶 **信道质量差**:信号干扰/衰减导致AP无法收到设备的帧确认(ACK) - 📡 **AP传输阻塞**:AP忙于处理其他流量(如广播风暴)导致响应延迟 2. **触发机制**: - 设备连续发送的802.11数据帧未收到AP的ACK确认 - 未确认帧数量超过协议阈值(通常由AP的`dot11ACKFailureThreshold`参数控制) 3. **影响**: - AP主动发送解除关联帧(Reason Code 0x0022)强制设备离线 - 常见于高干扰环境(如微波炉附近)或AP过载场景 **解决方案**: ```bash # Linux环境下诊断工具示例 iwconfig wlan0 | grep "Quality" # 检查信号质量 tcptrack -i wlan0 # 监控AP流量负载 ``` - 📶 优化信道:扫描并切换至空闲信道(如使用`iwlist wlan0 scan`) - 📡 减少干扰源:远离蓝牙设备/微波炉,或使用5GHz频段 - ⚙️ 调整AP配置:降低传输功率或增加ACK超时阈值
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