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RSS订阅LINQ标准查询操作符.pdf
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
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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
2010-12-09
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