public void Linq14() {
    int[] numbersA = { 0, 2, 4, 5, 6, 8, 9 };
    int[] numbersB = { 1, 3, 5, 7, 8 };
    var pairs =
        from a in numbersA,
                b in numbersB
        where a < b
        select new {a, b};
    Console.WriteLine("Pairs where a < b:");
    foreach (var pair in pairs) {
        Console.WriteLine("{0} is less than {1}", pair.a, pair.b);
    }
}

——————————————————————
from a in numbersA,
     b in numbersB这段代码，程序中报错，是什么原因，或者告诉我下格式那什么！

from a in numbersA from b in numbersB where a < b select new { a, b };

楼上说得对，或者可以换成
from a in numbersA join  b in numbersB where a < b select new { a, b };

學習來了

谢谢！又学到点~~

如果用join,a,b之间该怎么关联呢? join,on,equals应该要一起出现吧