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详细说明： LINQ标准查询操作符：LINQ查询表达式的构成模块，他们提供了许多查询功能，如过滤和排序等。标准查询操作符是构成查询模式的一系列方法的集合，并通过各自的LINQ提供程序来实现！ 章节目录： 一、投影操作符 .................................................................................................................................... 4 1. Select.......................................................................................................................................... 4 2. SelectMany.................................................................................................................................. 4 二、限制操作符 .................................................................................................................................... 5 三、排序操作符 .................................................................................................................................... 5 1. OrderBy ...................................................................................................................................... 5 2. OrderByDescending ....................................................................................................................... 6 3. ThenBy........................................................................................................................................ 6 4. ThenByDescending ........................................................................................................................ 6 5. Reverse ....................................................................................................................................... 7 四、联接操作符 .................................................................................................................................... 7 1. Join............................................................................................................................................. 7 2. GroupJoin.................................................................................................................................... 8 五、分组操作符 .................................................................................................................................... 9 六、串联操作符 ...................................................................................................................................10 七、聚合操作符 ...................................................................................................................................10 1. Aggregate ...................................................................................................................................10 2. Average......................................................................................................................................11 3. Count.........................................................................................................................................11 4. LongCount ..................................................................................................................................11 5. Max ...........................................................................................................................................11 6. Min............................................................................................................................................11 7. Sum ...........................................................................................................................................11 八、集合操作符 ...................................................................................................................................12 九、生成操作符 ...................................................................................................................................12 1. Empty ........................................................................................................................................12 2. DefaultIfEmpty .............................................................................................................................12 3. Range ........................................................................................................................................13 4. Repeat .......................................................................................................................................13 十、转换操作符 ...................................................................................................................................14 1. AsEnumerable.............................................................................................................................14 2. Cast ...........................................................................................................................................14 3. OfType .......................................................................................................................................15 4. ToArray ......................................................................................................................................15 5. ToDictionary ...............................................................................................................................15 6. ToList .........................................................................................................................................15 7. ToLookup....................................................................................................................................15 十一、元素操作符................................................................................................................................16 1. First ...........................................................................................................................................16 2. FirstOrDefault ..............................................................................................................................17 3. Last............................................................................................................................................18 4. LastOrDefault..............................................................................................................................18 5. ElementAt ..................................................................................................................................18 www.cnblogs.com/sunnycoder Sunny D.D LINQ 标准查询操作符 3 / 23 6. ElementAtOrDefault .....................................................................................................................18 7. Single.........................................................................................................................................18 8. SingleOrDefault ............................................................................................................................18 十二、相等操作符................................................................................................................................19 十三、限定操作符................................................................................................................................20 1. All..............................................................................................................................................20 2. Any ............................................................................................................................................20 3. Contains .....................................................................................................................................20 十四、分区操作符................................................................................................................................21 1. Take ...........................................................................................................................................21 2. TakeWhile...................................................................................................................................21 3. Skip ...........................................................................................................................................22 4. SkipWhile ...................................................................................................................................22 ...展开收缩
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