C# into子句
2021-05-02 06:26
标签:microsoft select hat div ora void note mod sof 可使用 下面的示例演示使用 C# into子句 标签:microsoft select hat div ora void note mod sof 原文地址:http://www.cnblogs.com/dehuachenyunfei/p/7772101.htmlinto
上下文关键字创建临时标识符,将 group、join 或 select 子句的结果存储至新标识符。 此标识符本身可以是附加查询命令的生成器。 有时称在 group
或 select
子句中使用新标识符为“延续”。示例
into
关键字来启用具有推断类型 IGrouping
的临时标识符 fruitGroup
。 通过使用该标识符,可对每个组调用 Count 方法,并且仅选择那些包含两个或更多个单词的组。class IntoSample1
{
static void Main()
{
// Create a data source.
string[] words = { "apples", "blueberries", "oranges", "bananas", "apricots"};
// Create the query.
var wordGroups1 =
from w in words
group w by w[0] into fruitGroup
where fruitGroup.Count() >= 2
select new { FirstLetter = fruitGroup.Key, Words = fruitGroup.Count() };
// Execute the query. Note that we only iterate over the groups,
// not the items in each group
foreach (var item in wordGroups1)
{
Console.WriteLine(" {0} has {1} elements.", item.FirstLetter, item.Words);
}
// Keep the console window open in debug mode
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
}
}
/* Output:
a has 2 elements.
b has 2 elements.
*/
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