This document is a tutorial on LINQ concepts like SelectMany, Aggregate, deferred and immediate execution, joins, and references. It provides examples of using Aggregate to calculate a running product and balance. It demonstrates deferred query execution versus immediate execution. It also discusses cross joins, inner joins, and outer joins on sample data and how to perform each type of join.

1. Linq 溫故知新
Howard 2013/12/13

2. 先來個問題

3. 提示
 SelectMany

4. 解答

5. Aggregate

6. Aggregate - Simple
 This sample uses Aggregate to create a running product on the array that
calculates the total product of all elements.

7. Aggregate - Seed
 This sample uses Aggregate to
create a running account
balance that subtracts each
withdrawal from the initial
balance of 100, as long as the
balance never drops below 0.

8. Deferred Execution
 The following sample shows how query execution is deferred
until the query is enumerated at a foreach statement.
 請問輸出結果是?

9. Immediate Execution
 輸出結果如下，該怎麼做?

10. Query Reuse
請問輸出結果是?

11. cross join, inner join, outer join
資料如下：

12. cross join
 怎麼做?

13. inner join
 怎麼做?

14. outer join
 怎麼做?

15. References
 http://code.msdn.microsoft.com/101-LINQ-Samples-3fb9811b