Code
///?<summary>
///?QuerySyntax（查詢語法）的摘要說明
///?</summary>
public?class?QuerySyntax
{
????public?int?ID?{?get;?set;?}
????public?string?Name?{?get;?set;?}

????public?void?QuerySyntaxTest()
????{
????????List<QuerySyntax>?list?=?new?List<QuerySyntax>
????????{
????????????new?QuerySyntax?{?ID?=?1,?Name?=?"webabcd"?},
????????????new?QuerySyntax?{?ID?=?2,?Name?=?"webabcde"?},
????????????new?QuerySyntax?{?ID?=?2,?Name?=?"webabcdef"?},
????????????new?QuerySyntax?{?ID?=?2,?Name?=?"webabcdefg"?},
????????????new?QuerySyntax?{?ID?=?2,?Name?=?"webabcdefgh"?},
????????????new?QuerySyntax?{?ID?=?2,?Name?=?"webabcdefghi"?},
????????????new?QuerySyntax?{?ID?=?2,?Name?=?"webabcdefghij"?},
????????????new?QuerySyntax?{?ID?=?2,?Name?=?"webabcdefghijk"?},
????????????new?QuerySyntax?{?ID?=?2,?Name?=?"webabcdefghijkl"?},
????????????new?QuerySyntax?{?ID?=?2,?Name?=?"webabcdefghijklm"?},
????????????new?QuerySyntax?{?ID?=?3,?Name?=?"webabcdefghijklmn"?}
????????};

????????IEnumerable<QuerySyntax>?l?=?from?o?in?list
?????????????????????????????????????where?o.Name.Length?>?10
?????????????????????????????????????orderby?o.Name.Length?descending
?????????????????????????????????????select?o;

????????//?上面的（查詢語法）等同于下面的（LINQ擴展方法和Lambda表達式）
????????//?查詢語法相對更容易理解

????????//?IEnumerable<QuerySyntax>?l?=?list.Where(o?=>?o.Name.Length?>?10).OrderByDescending(o?=>?o.Name.Length);



????????//?Projection（映射）
????????//?可以返回一個新的類型
????????IEnumerable<Projection>?l2?=?from?o?in?list
??????????????????????????????????????where?o.Name.Length?>?10
??????????????????????????????????????orderby?o.Name.Length?descending
??????????????????????????????????????select?new?Projection?{?Name?=?o.Name?};
????}
}

///?<summary>
///?為了演示Projection（映射）而寫的實體類
///?</summary>
public?class?Projection
{
????public?string?Name?{?get;?set;?}
}

轉載于:https://www.cnblogs.com/tommyli/archive/2009/01/04/1368252.html

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