【无私分享:ASP.NET CORE 项目实战(第五章)】Repository仓储 UnitofWork
2016-08-25 21:18
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目录索引
【无私分享:ASP.NET CORE 项目实战】目录索引简介
本章我们来创建仓储类Repository 并且引入 UnitOfWork我对UnitOfWork的一些理解
UnitOfWork 工作单元,对于这个的解释和实例,网上很多很多大神之作,我在这就不班门弄斧了,只是浅谈 一下个人理解,不一定对,希望大家指正:UnitOfWork 看了很多,个人理解就是 统一事务,在很多操作中我们可能是进行多项操作的,比如 同时保存两个表的数据,如果我们先保存一个表(SaveChanges()之后),再保存另一个表(SaveChanges())其实是两个不同的事务,通俗的讲,我们对数据库提交了两次数据。而UnitOfWork 就是 把本次操作(分别保存两张表)放在统一事务中,所有的CRUD完成后,统一提交数据,即保证数据的一致性,又减少了提交次数,提高性能。
举个例子,我们之前的Repository的保存操作:
Repository:
public virtual bool Save(T entity)
{
_Context.Add(entity);
return _Context.SaveChanges() > 0;
}
Controller:
public ActionResult Save()
{
var Users=new Users(){Id=1,UserName="张三"};
var Logs=new Logs(){log="注册了用户张三"};
_UserService.Save(Users);
_LogService.Save(Logs);
}
因为本身EF就是带事务的,但是_Context.SaveChanges()之后,事务就结束了,也提交了数据。所以,上面的例子 应该是开启了两次事务,提交了两次数据(一次是Users 一次是 Logs)
这显然是不合理的,首先不说提交两次数据性能的问题,如果用户注册失败,那么日志也不应该添加,应该回滚。但是,显然,上面没有这么做。
所以有了UnitOfWork。
使用UnitOfWork之后,代码应该是这样的:
UnitOfWork:
public bool Commit()
{
return _Context.SaveChanges() > 0;
}
Repository:
public virtual bool Save(T entity)
{
_Context.Add(entity);
}
Controller:
public ActionResult Save()
{
var Users=new Users(){Id=1,UserName="张三"};
var Logs=new Logs(){log="注册了用户张三"};
_UserService.Save(Users);
_LogService.Save(Logs);
_UnitOfWork.Commit();
}
UnitOfWork接口和实现类
我们在wkmvc.Core类库下,新建一个接口 IUnitOfWork:1 public abstract class Repository<T> : IRepository<T> where T : class 2 { 3 #region 数据上下文 4 5 /// <summary> 6 /// 数据上下文 7 /// </summary> 8 private ApplicationDbContext _Context; 9 10 public Repository(ApplicationDbContext Context) 11 { 12 _Context = Context; 13 } 14 15 #endregion 16 17 #region 单模型 CRUD 操作 18 19 /// <summary> 20 /// 增加一条记录 21 /// </summary> 22 /// <param name="entity">实体模型</param> 23 /// <param name="IsCommit">是否提交(默认提交)</param> 24 /// <returns></returns> 25 public virtual bool Save(T entity,bool IsCommit=true) 26 { 27 _Context.Set<T>().Add(entity); 28 if (IsCommit) 29 return _Context.SaveChanges() > 0; 30 else 31 return false; 32 } 33 /// <summary> 34 /// 增加一条记录(异步方式) 35 /// </summary> 36 /// <param name="entity">实体模型</param> 37 /// <param name="IsCommit">是否提交(默认提交)</param> 38 /// <returns></returns> 39 public virtual async Task<bool> SaveAsync(T entity, bool IsCommit = true) 40 { 41 _Context.Set<T>().Add(entity); 42 if (IsCommit) 43 return await Task.Run(() => _Context.SaveChanges() > 0); 44 else 45 return await Task.Run(() => false); 46 } 47 48 /// <summary> 49 /// 更新一条记录 50 /// </summary> 51 /// <param name="entity">实体模型</param> 52 /// <param name="IsCommit">是否提交(默认提交)</param> 53 /// <returns></returns> 54 public virtual bool Update(T entity, bool IsCommit = true) 55 { 56 _Context.Set<T>().Attach(entity); 57 _Context.Entry<T>(entity).State = EntityState.Modified; 58 if (IsCommit) 59 return _Context.SaveChanges() > 0; 60 else 61 return false; 62 } 63 /// <summary> 64 /// 更新一条记录(异步方式) 65 /// </summary> 66 /// <param name="entity">实体模型</param> 67 /// <param name="IsCommit">是否提交(默认提交)</param> 68 /// <returns></returns> 69 public virtual async Task<bool> UpdateAsync(T entity, bool IsCommit = true) 70 { 71 _Context.Set<T>().Attach(entity); 72 _Context.Entry<T>(entity).State = EntityState.Modified; 73 if (IsCommit) 74 return await Task.Run(() => _Context.SaveChanges() > 0); 75 else 76 return await Task.Run(() => false); 77 } 78 79 /// <summary> 80 /// 增加或更新一条记录 81 /// </summary> 82 /// <param name="entity">实体模型</param> 83 /// <param name="IsSave">是否增加</param> 84 /// <param name="IsCommit">是否提交(默认提交)</param> 85 /// <returns></returns> 86 public virtual bool SaveOrUpdate(T entity, bool IsSave, bool IsCommit = true) 87 { 88 return IsSave ? Save(entity, IsCommit) : Update(entity, IsCommit); 89 } 90 /// <summary> 91 /// 增加或更新一条记录(异步方式) 92 /// </summary> 93 /// <param name="entity">实体模型</param> 94 /// <param name="IsSave">是否增加</param> 95 /// <param name="IsCommit">是否提交(默认提交)</param> 96 /// <returns></returns> 97 public virtual async Task<bool> SaveOrUpdateAsync(T entity, bool IsSave, bool IsCommit = true) 98 { 99 return IsSave ? await SaveAsync(entity, IsCommit) : await UpdateAsync(entity, IsCommit); 100 } 101 102 /// <summary> 103 /// 通过Lamda表达式获取实体 104 /// </summary> 105 /// <param name="predicate">Lamda表达式(p=>p.Id==Id)</param> 106 /// <returns></returns> 107 public virtual T Get(Expression<Func<T, bool>> predicate) 108 { 109 return _Context.Set<T>().AsNoTracking().SingleOrDefault(predicate); 110 } 111 /// <summary> 112 /// 通过Lamda表达式获取实体(异步方式) 113 /// </summary> 114 /// <param name="predicate">Lamda表达式(p=>p.Id==Id)</param> 115 /// <returns></returns> 116 public virtual async Task<T> GetAsync(Expression<Func<T, bool>> predicate) 117 { 118 return await Task.Run(()=> _Context.Set<T>().AsNoTracking().SingleOrDefault(predicate)); 119 } 120 121 /// <summary> 122 /// 删除一条记录 123 /// </summary> 124 /// <param name="entity">实体模型</param> 125 /// <param name="IsCommit">是否提交(默认提交)</param> 126 /// <returns></returns> 127 public virtual bool Delete(T entity, bool IsCommit = true) 128 { 129 if (entity == null) return false; 130 _Context.Set<T>().Attach(entity); 131 _Context.Set<T>().Remove(entity); 132 133 if (IsCommit) 134 return _Context.SaveChanges() > 0; 135 else 136 return false; 137 } 138 /// <summary> 139 /// 删除一条记录(异步方式) 140 /// </summary> 141 /// <param name="entity">实体模型</param> 142 /// <param name="IsCommit">是否提交(默认提交)</param> 143 /// <returns></returns> 144 public virtual async Task<bool> DeleteAsync(T entity, bool IsCommit = true) 145 { 146 if (entity == null) return await Task.Run(() => false); 147 _Context.Set<T>().Attach(entity); 148 _Context.Set<T>().Remove(entity); 149 if (IsCommit) 150 return await Task.Run(() => _Context.SaveChanges() > 0); 151 else 152 return await Task.Run(() => false); ; 153 } 154 155 #endregion 156 157 #region 多模型 操作 158 159 /// <summary> 160 /// 增加多条记录,同一模型 161 /// </summary> 162 /// <param name="T1">实体模型集合</param> 163 /// <param name="IsCommit">是否提交(默认提交)</param> 164 /// <returns></returns> 165 public virtual bool SaveList(List<T> T1, bool IsCommit = true) 166 { 167 if (T1 == null || T1.Count == 0) return false; 168 169 T1.ToList().ForEach(item => 170 { 171 _Context.Set<T>().Add(item); 172 }); 173 174 if (IsCommit) 175 return _Context.SaveChanges() > 0; 176 else 177 return false; 178 } 179 /// <summary> 180 /// 增加多条记录,同一模型(异步方式) 181 /// </summary> 182 /// <param name="T1">实体模型集合</param> 183 /// <param name="IsCommit">是否提交(默认提交)</param> 184 /// <returns></returns> 185 public virtual async Task<bool> SaveListAsync(List<T> T1, bool IsCommit = true) 186 { 187 if (T1 == null || T1.Count == 0) return await Task.Run(() => false); 188 189 T1.ToList().ForEach(item => 190 { 191 _Context.Set<T>().Add(item); 192 }); 193 194 if (IsCommit) 195 return await Task.Run(() => _Context.SaveChanges() > 0); 196 else 197 return await Task.Run(() => false); 198 } 199 200 /// <summary> 201 /// 增加多条记录,独立模型 202 /// </summary> 203 /// <param name="T1">实体模型集合</param> 204 /// <param name="IsCommit">是否提交(默认提交)</param> 205 /// <returns></returns> 206 public virtual bool SaveList<T1>(List<T1> T, bool IsCommit = true) where T1 : class 207 { 208 if (T == null || T.Count == 0) return false; 209 var tmp = _Context.ChangeTracker.Entries<T>().ToList(); 210 foreach (var x in tmp) 211 { 212 var properties = typeof(T).GetTypeInfo().GetProperties(); 213 foreach (var y in properties) 214 { 215 var entry = x.Property(y.Name); 216 entry.CurrentValue = entry.OriginalValue; 217 entry.IsModified = false; 218 y.SetValue(x.Entity, entry.OriginalValue); 219 } 220 x.State = EntityState.Unchanged; 221 } 222 T.ToList().ForEach(item => 223 { 224 _Context.Set<T1>().Add(item); 225 }); 226 if (IsCommit) 227 return _Context.SaveChanges() > 0; 228 else 229 return false; 230 } 231 /// <summary> 232 /// 增加多条记录,独立模型(异步方式) 233 /// </summary> 234 /// <param name="T1">实体模型集合</param> 235 /// <param name="IsCommit">是否提交(默认提交)</param> 236 /// <returns></returns> 237 public virtual async Task<bool> SaveListAsync<T1>(List<T1> T, bool IsCommit = true) where T1 : class 238 { 239 if (T == null || T.Count == 0) return await Task.Run(() => false); 240 var tmp = _Context.ChangeTracker.Entries<T>().ToList(); 241 foreach (var x in tmp) 242 { 243 var properties = typeof(T).GetTypeInfo().GetProperties(); 244 foreach (var y in properties) 245 { 246 var entry = x.Property(y.Name); 247 entry.CurrentValue = entry.OriginalValue; 248 entry.IsModified = false; 249 y.SetValue(x.Entity, entry.OriginalValue); 250 } 251 x.State = EntityState.Unchanged; 252 } 253 T.ToList().ForEach(item => 254 { 255 _Context.Set<T1>().Add(item); 256 }); 257 if (IsCommit) 258 return await Task.Run(() => _Context.SaveChanges() > 0); 259 else 260 return await Task.Run(() => false); 261 } 262 263 /// <summary> 264 /// 更新多条记录,同一模型 265 /// </summary> 266 /// <param name="T1">实体模型集合</param> 267 /// <param name="IsCommit">是否提交(默认提交)</param> 268 /// <returns></returns> 269 public virtual bool UpdateList(List<T> T1, bool IsCommit = true) 270 { 271 if (T1 == null || T1.Count == 0) return false; 272 273 T1.ToList().ForEach(item => 274 { 275 _Context.Set<T>().Attach(item); 276 _Context.Entry<T>(item).State = EntityState.Modified; 277 }); 278 279 if (IsCommit) 280 return _Context.SaveChanges() > 0; 281 else 282 return false; 283 } 284 /// <summary> 285 /// 更新多条记录,同一模型(异步方式) 286 /// </summary> 287 /// <param name="T1">实体模型集合</param> 288 /// <param name="IsCommit">是否提交(默认提交)</param> 289 /// <returns></returns> 290 public virtual async Task<bool> UpdateListAsync(List<T> T1, bool IsCommit = true) 291 { 292 if (T1 == null || T1.Count == 0) return await Task.Run(() => false); 293 294 T1.ToList().ForEach(item => 295 { 296 _Context.Set<T>().Attach(item); 297 _Context.Entry<T>(item).State = EntityState.Modified; 298 }); 299 300 if (IsCommit) 301 return await Task.Run(() => _Context.SaveChanges() > 0); 302 else 303 return await Task.Run(() => false); 304 } 305 306 /// <summary> 307 /// 更新多条记录,独立模型 308 /// </summary> 309 /// <param name="T1">实体模型集合</param> 310 /// <param name="IsCommit">是否提交(默认提交)</param> 311 /// <returns></returns> 312 public virtual bool UpdateList<T1>(List<T1> T, bool IsCommit = true) where T1 : class 313 { 314 if (T == null || T.Count == 0) return false; 315 316 T.ToList().ForEach(item => 317 { 318 _Context.Set<T1>().Attach(item); 319 _Context.Entry<T1>(item).State = EntityState.Modified; 320 }); 321 322 if (IsCommit) 323 return _Context.SaveChanges() > 0; 324 else 325 return false; 326 } 327 /// <summary> 328 /// 更新多条记录,独立模型(异步方式) 329 /// </summary> 330 /// <param name="T1">实体模型集合</param> 331 /// <param name="IsCommit">是否提交(默认提交)</param> 332 /// <returns></returns> 333 public virtual async Task<bool> UpdateListAsync<T1>(List<T1> T, bool IsCommit = true) where T1 : class 334 { 335 if (T == null || T.Count == 0) return await Task.Run(() => false); 336 337 T.ToList().ForEach(item => 338 { 339 _Context.Set<T1>().Attach(item); 340 _Context.Entry<T1>(item).State = EntityState.Modified; 341 }); 342 343 if (IsCommit) 344 return await Task.Run(() => _Context.SaveChanges() > 0); 345 else 346 return await Task.Run(() => false); 347 } 348 349 /// <summary> 350 /// 删除多条记录,同一模型 351 /// </summary> 352 /// <param name="T1">实体模型集合</param> 353 /// <param name="IsCommit">是否提交(默认提交)</param> 354 /// <returns></returns> 355 public virtual bool DeleteList(List<T> T1, bool IsCommit = true) 356 { 357 if (T1 == null || T1.Count == 0) return false; 358 359 T1.ToList().ForEach(item => 360 { 361 _Context.Set<T>().Attach(item); 362 _Context.Set<T>().Remove(item); 363 }); 364 365 if (IsCommit) 366 return _Context.SaveChanges() > 0; 367 else 368 return false; 369 } 370 /// <summary> 371 /// 删除多条记录,同一模型(异步方式) 372 /// </summary> 373 /// <param name="T1">实体模型集合</param> 374 /// <param name="IsCommit">是否提交(默认提交)</param> 375 /// <returns></returns> 376 public virtual async Task<bool> DeleteListAsync(List<T> T1, bool IsCommit = true) 377 { 378 if (T1 == null || T1.Count == 0) return await Task.Run(() => false); 379 380 T1.ToList().ForEach(item => 381 { 382 _Context.Set<T>().Attach(item); 383 _Context.Set<T>().Remove(item); 384 }); 385 386 if (IsCommit) 387 return await Task.Run(() => _Context.SaveChanges() > 0); 388 else 389 return await Task.Run(() => false); 390 } 391 392 /// <summary> 393 /// 删除多条记录,独立模型 394 /// </summary> 395 /// <param name="T1">实体模型集合</param> 396 /// <param name="IsCommit">是否提交(默认提交)</param> 397 /// <returns></returns> 398 public virtual bool DeleteList<T1>(List<T1> T, bool IsCommit = true) where T1 : class 399 { 400 if (T == null || T.Count == 0) return false; 401 402 T.ToList().ForEach(item => 403 { 404 _Context.Set<T1>().Attach(item); 405 _Context.Set<T1>().Remove(item); 406 }); 407 408 if (IsCommit) 409 return _Context.SaveChanges() > 0; 410 else 411 return false; 412 } 413 /// <summary> 414 /// 删除多条记录,独立模型(异步方式) 415 /// </summary> 416 /// <param name="T1">实体模型集合</param> 417 /// <param name="IsCommit">是否提交(默认提交)</param> 418 /// <returns></returns> 419 public virtual async Task<bool> DeleteListAsync<T1>(List<T1> T, bool IsCommit = true) where T1 : class 420 { 421 if (T == null || T.Count == 0) return await Task.Run(() => false); 422 423 T.ToList().ForEach(item => 424 { 425 _Context.Set<T1>().Attach(item); 426 _Context.Set<T1>().Remove(item); 427 }); 428 429 if (IsCommit) 430 return await Task.Run(() => _Context.SaveChanges() > 0); 431 else 432 return await Task.Run(() => false); 433 } 434 435 /// <summary> 436 /// 通过Lamda表达式,删除一条或多条记录 437 /// </summary> 438 /// <param name="predicate"></param> 439 /// <param name="IsCommit"></param> 440 /// <returns></returns> 441 public virtual bool Delete(Expression<Func<T, bool>> predicate, bool IsCommit = true) 442 { 443 IQueryable<T> entry = (predicate == null) ? _Context.Set<T>().AsQueryable() : _Context.Set<T>().Where(predicate); 444 List<T> list = entry.ToList(); 445 446 if (list != null && list.Count == 0) return false; 447 list.ForEach(item => { 448 _Context.Set<T>().Attach(item); 449 _Context.Set<T>().Remove(item); 450 }); 451 452 if (IsCommit) 453 return _Context.SaveChanges() > 0; 454 else 455 return false; 456 } 457 /// <summary> 458 /// 通过Lamda表达式,删除一条或多条记录(异步方式) 459 /// </summary> 460 /// <param name="predicate"></param> 461 /// <param name="IsCommit"></param> 462 /// <returns></returns> 463 public virtual async Task<bool> DeleteAsync(Expression<Func<T, bool>> predicate, bool IsCommit = true) 464 { 465 IQueryable<T> entry = (predicate == null) ? _Context.Set<T>().AsQueryable() : _Context.Set<T>().Where(predicate); 466 List<T> list = entry.ToList(); 467 468 if (list != null && list.Count == 0) return await Task.Run(() => false); 469 list.ForEach(item => { 470 _Context.Set<T>().Attach(item); 471 _Context.Set<T>().Remove(item); 472 }); 473 474 if (IsCommit) 475 return await Task.Run(() => _Context.SaveChanges() > 0); 476 else 477 return await Task.Run(() => false); 478 } 479 480 #endregion 481 482 #region 获取多条数据操作 483 484 /// <summary> 485 /// Lamda返回IQueryable集合,延时加载数据 486 /// </summary> 487 /// <param name="predicate"></param> 488 /// <returns></returns> 489 public virtual IQueryable<T> LoadAll(Expression<Func<T, bool>> predicate) 490 { 491 return predicate != null ? _Context.Set<T>().Where(predicate).AsNoTracking<T>() : _Context.Set<T>().AsQueryable<T>().AsNoTracking<T>(); 492 } 493 /// <summary> 494 /// 返回IQueryable集合,延时加载数据(异步方式) 495 /// </summary> 496 /// <param name="predicate"></param> 497 /// <returns></returns> 498 public virtual async Task<IQueryable<T>> LoadAllAsync(Expression<Func<T, bool>> predicate) 499 { 500 return predicate != null ? await Task.Run(()=> _Context.Set<T>().Where(predicate).AsNoTracking<T>()) : await Task.Run(() => _Context.Set<T>().AsQueryable<T>().AsNoTracking<T>()); 501 } 502 503 /// <summary> 504 /// 返回List<T>集合,不采用延时加载 505 /// </summary> 506 /// <param name="predicate"></param> 507 /// <returns></returns> 508 public virtual List<T> LoadListAll(Expression<Func<T, bool>> predicate) 509 { 510 return predicate != null ? _Context.Set<T>().Where(predicate).AsNoTracking().ToList() : _Context.Set<T>().AsQueryable<T>().AsNoTracking().ToList(); 511 } 512 // <summary> 513 /// 返回List<T>集合,不采用延时加载(异步方式) 514 /// </summary> 515 /// <param name="predicate"></param> 516 /// <returns></returns> 517 public virtual async Task<List<T>> LoadListAllAsync(Expression<Func<T, bool>> predicate) 518 { 519 return predicate != null ? await Task.Run(() => _Context.Set<T>().Where(predicate).AsNoTracking().ToList()) : await Task.Run(() => _Context.Set<T>().AsQueryable<T>().AsNoTracking().ToList()); 520 } 521 522 /// <summary> 523 /// T-Sql方式:返回IQueryable<T>集合 524 /// </summary> 525 /// <param name="sql">SQL语句</param> 526 /// <param name="para">Parameters参数</param> 527 /// <returns></returns> 528 public virtual IQueryable<T> LoadAllBySql(string sql, params DbParameter[] para) 529 { 530 return _Context.Set<T>().FromSql(sql, para); 531 } 532 /// <summary> 533 /// T-Sql方式:返回IQueryable<T>集合(异步方式) 534 /// </summary> 535 /// <param name="sql">SQL语句</param> 536 /// <param name="para">Parameters参数</param> 537 /// <returns></returns> 538 public virtual async Task<IQueryable<T>> LoadAllBySqlAsync(string sql, params DbParameter[] para) 539 { 540 return await Task.Run(() => _Context.Set<T>().FromSql(sql, para)); 541 } 542 543 544 /// <summary> 545 /// T-Sql方式:返回List<T>集合 546 /// </summary> 547 /// <param name="sql">SQL语句</param> 548 /// <param name="para">Parameters参数</param> 549 /// <returns></returns> 550 public virtual List<T> LoadListAllBySql(string sql, params DbParameter[] para) 551 { 552 return _Context.Set<T>().FromSql(sql, para).Cast<T>().ToList(); 553 } 554 /// <summary> 555 /// T-Sql方式:返回List<T>集合(异步方式) 556 /// </summary> 557 /// <param name="sql">SQL语句</param> 558 /// <param name="para">Parameters参数</param> 559 /// <returns></returns> 560 public virtual async Task<List<T>> LoadListAllBySqlAsync(string sql, params DbParameter[] para) 561 { 562 return await Task.Run(()=> _Context.Set<T>().FromSql(sql, para).Cast<T>().ToList()); 563 } 564 565 /// <summary> 566 /// 可指定返回结果、排序、查询条件的通用查询方法,返回实体对象集合 567 /// </summary> 568 /// <typeparam name="TEntity">实体对象</typeparam> 569 /// <typeparam name="TOrderBy">排序字段类型</typeparam> 570 /// <typeparam name="TResult">数据结果,与TEntity一致</typeparam> 571 /// <param name="where">过滤条件,需要用到类型转换的需要提前处理与数据表一致的</param> 572 /// <param name="orderby">排序字段</param> 573 /// <param name="selector">返回结果(必须是模型中存在的字段)</param> 574 /// <param name="IsAsc">排序方向,true为正序false为倒序</param> 575 /// <returns>实体集合</returns> 576 public virtual List<TResult> QueryEntity<TEntity, TOrderBy, TResult> 577 (Expression<Func<TEntity, bool>> where, 578 Expression<Func<TEntity, TOrderBy>> orderby, 579 Expression<Func<TEntity, TResult>> selector, 580 bool IsAsc) 581 where TEntity : class 582 where TResult : class 583 { 584 IQueryable<TEntity> query = _Context.Set<TEntity>(); 585 if (where != null) 586 { 587 query = query.Where(where); 588 } 589 590 if (orderby != null) 591 { 592 query = IsAsc ? query.OrderBy(orderby) : query.OrderByDescending(orderby); 593 } 594 if (selector == null) 595 { 596 return query.Cast<TResult>().AsNoTracking().ToList(); 597 } 598 return query.Select(selector).AsNoTracking().ToList(); 599 } 600 /// <summary> 601 /// 可指定返回结果、排序、查询条件的通用查询方法,返回实体对象集合(异步方式) 602 /// </summary> 603 /// <typeparam name="TEntity">实体对象</typeparam> 604 /// <typeparam name="TOrderBy">排序字段类型</typeparam> 605 /// <typeparam name="TResult">数据结果,与TEntity一致</typeparam> 606 /// <param name="where">过滤条件,需要用到类型转换的需要提前处理与数据表一致的</param> 607 /// <param name="orderby">排序字段</param> 608 /// <param name="selector">返回结果(必须是模型中存在的字段)</param> 609 /// <param name="IsAsc">排序方向,true为正序false为倒序</param> 610 /// <returns>实体集合</returns> 611 public virtual async Task<List<TResult>> QueryEntityAsync<TEntity, TOrderBy, TResult> 612 (Expression<Func<TEntity, bool>> where, 613 Expression<Func<TEntity, TOrderBy>> orderby, 614 Expression<Func<TEntity, TResult>> selector, 615 bool IsAsc) 616 where TEntity : class 617 where TResult : class 618 { 619 IQueryable<TEntity> query = _Context.Set<TEntity>(); 620 if (where != null) 621 { 622 query = query.Where(where); 623 } 624 625 if (orderby != null) 626 { 627 query = IsAsc ? query.OrderBy(orderby) : query.OrderByDescending(orderby); 628 } 629 if (selector == null) 630 { 631 return await Task.Run(() => query.Cast<TResult>().AsNoTracking().ToList()); 632 } 633 return await Task.Run(() => query.Select(selector).AsNoTracking().ToList()); 634 } 635 636 /// <summary> 637 /// 可指定返回结果、排序、查询条件的通用查询方法,返回Object对象集合 638 /// </summary> 639 /// <typeparam name="TEntity">实体对象</typeparam> 640 /// <typeparam name="TOrderBy">排序字段类型</typeparam> 641 /// <param name="where">过滤条件,需要用到类型转换的需要提前处理与数据表一致的</param> 642 /// <param name="orderby">排序字段</param> 643 /// <param name="selector">返回结果(必须是模型中存在的字段)</param> 644 /// <param name="IsAsc">排序方向,true为正序false为倒序</param> 645 /// <returns>自定义实体集合</returns> 646 public virtual List<object> QueryObject<TEntity, TOrderBy> 647 (Expression<Func<TEntity, bool>> where, 648 Expression<Func<TEntity, TOrderBy>> orderby, 649 Func<IQueryable<TEntity>, 650 List<object>> selector, 651 bool IsAsc) 652 where TEntity : class 653 { 654 IQueryable<TEntity> query = _Context.Set<TEntity>(); 655 if (where != null) 656 { 657 query = query.Where(where); 658 } 659 660 if (orderby != null) 661 { 662 query = IsAsc ? query.OrderBy(orderby) : query.OrderByDescending(orderby); 663 } 664 if (selector == null) 665 { 666 return query.AsNoTracking().ToList<object>(); 667 } 668 return selector(query); 669 } 670 /// <summary> 671 /// 可指定返回结果、排序、查询条件的通用查询方法,返回Object对象集合(异步方式) 672 /// </summary> 673 /// <typeparam name="TEntity">实体对象</typeparam> 674 /// <typeparam name="TOrderBy">排序字段类型</typeparam> 675 /// <param name="where">过滤条件,需要用到类型转换的需要提前处理与数据表一致的</param> 676 /// <param name="orderby">排序字段</param> 677 /// <param name="selector">返回结果(必须是模型中存在的字段)</param> 678 /// <param name="IsAsc">排序方向,true为正序false为倒序</param> 679 /// <returns>自定义实体集合</returns> 680 public virtual async Task<List<object>> QueryObjectAsync<TEntity, TOrderBy> 681 (Expression<Func<TEntity, bool>> where, 682 Expression<Func<TEntity, TOrderBy>> orderby, 683 Func<IQueryable<TEntity>, 684 List<object>> selector, 685 bool IsAsc) 686 where TEntity : class 687 { 688 IQueryable<TEntity> query = _Context.Set<TEntity>(); 689 if (where != null) 690 { 691 query = query.Where(where); 692 } 693 694 if (orderby != null) 695 { 696 query = IsAsc ? query.OrderBy(orderby) : query.OrderByDescending(orderby); 697 } 698 if (selector == null) 699 { 700 return await Task.Run(() => query.AsNoTracking().ToList<object>()); 701 } 702 return await Task.Run(() => selector(query)); 703 } 704 705 706 /// <summary> 707 /// 可指定返回结果、排序、查询条件的通用查询方法,返回动态类对象集合 708 /// </summary> 709 /// <typeparam name="TEntity">实体对象</typeparam> 710 /// <typeparam name="TOrderBy">排序字段类型</typeparam> 711 /// <param name="where">过滤条件,需要用到类型转换的需要提前处理与数据表一致的</param> 712 /// <param name="orderby">排序字段</param> 713 /// <param name="selector">返回结果(必须是模型中存在的字段)</param> 714 /// <param name="IsAsc">排序方向,true为正序false为倒序</param> 715 /// <returns>动态类</returns> 716 public virtual dynamic QueryDynamic<TEntity, TOrderBy> 717 (Expression<Func<TEntity, bool>> where, 718 Expression<Func<TEntity, TOrderBy>> orderby, 719 Func<IQueryable<TEntity>, 720 List<object>> selector, 721 bool IsAsc) 722 where TEntity : class 723 { 724 List<object> list = QueryObject<TEntity, TOrderBy> 725 (where, orderby, selector, IsAsc); 726 return Common.JsonHelper.JsonConvert.JsonClass(list); 727 } 728 /// <summary> 729 /// 可指定返回结果、排序、查询条件的通用查询方法,返回动态类对象集合(异步方式) 730 /// </summary> 731 /// <typeparam name="TEntity">实体对象</typeparam> 732 /// <typeparam name="TOrderBy">排序字段类型</typeparam> 733 /// <param name="where">过滤条件,需要用到类型转换的需要提前处理与数据表一致的</param> 734 /// <param name="orderby">排序字段</param> 735 /// <param name="selector">返回结果(必须是模型中存在的字段)</param> 736 /// <param name="IsAsc">排序方向,true为正序false为倒序</param> 737 /// <returns>动态类</returns> 738 public virtual async Task<dynamic> QueryDynamicAsync<TEntity, TOrderBy> 739 (Expression<Func<TEntity, bool>> where, 740 Expression<Func<TEntity, TOrderBy>> orderby, 741 Func<IQueryable<TEntity>, 742 List<object>> selector, 743 bool IsAsc) 744 where TEntity : class 745 { 746 List<object> list = QueryObject<TEntity, TOrderBy> 747 (where, orderby, selector, IsAsc); 748 return await Task.Run(() => Common.JsonHelper.JsonConvert.JsonClass(list)) ; 749 } 750 751 #endregion 752 753 #region 验证是否存在 754 755 /// <summary> 756 /// 验证当前条件是否存在相同项 757 /// </summary> 758 public virtual bool IsExist(Expression<Func<T, bool>> predicate) 759 { 760 var entry = _Context.Set<T>().Where(predicate); 761 return (entry.Any()); 762 } 763 /// <summary> 764 /// 验证当前条件是否存在相同项(异步方式) 765 /// </summary> 766 public virtual async Task<bool> IsExistAsync(Expression<Func<T, bool>> predicate) 767 { 768 var entry = _Context.Set<T>().Where(predicate); 769 return await Task.Run(() => entry.Any()); 770 } 771 772 /// <summary> 773 /// 根据SQL验证实体对象是否存在 774 /// </summary> 775 public virtual bool IsExist(string sql, params DbParameter[] para) 776 { 777 return _Context.Database.ExecuteSqlCommand(sql, para) > 0; 778 } 779 /// <summary> 780 /// 根据SQL验证实体对象是否存在(异步方式) 781 /// </summary> 782 public virtual async Task<bool> IsExistAsync(string sql, params DbParameter[] para) 783 { 784 return await Task.Run(() => _Context.Database.ExecuteSqlCommand(sql, para) > 0); 785 } 786 787 #endregion 788 789 }
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希望跟大家一起学习Asp.net Core
刚开始接触,水平有限,很多东西都是自己的理解和翻阅网上大神的资料,如果有不对的地方和不理解的地方,希望大家指正!
虽然Asp.net Core 现在很火热,但是网上的很多资料都是前篇一律的复制,所以有很多问题我也暂时没有解决,希望大家能共同帮助一下!
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