xelement root = new xelement("root",
new object
),new xelement("stu",
new object
),new xelement("stu",
new object
),new xelement("stu",
new object
),new xelement("stu",
new object
),new xelement("stu",
new object)}
);console.writeline(root);
console.writeline("linq查詢");
var query = from val in root.elements() where val.attribute("num").value == "093431237" || val.attribute("name").value == "peter" select val;
console.writeline(query.count());
foreach (var item in query)
var query2 = from val in root.elements("root") select val;
console.writeline("query2查詢結果:" + query2.count());
var query3 = from val in root.elements("stu") select val;
console.writeline("query3查詢結果:" + query3.count());
foreach (var item in query3)
console.writeline("查詢結果query4");
var query4 = from val in root.elements("stu") select new ;
foreach (var item in query4)
var query5 = from val in root.elements("stu") where int.parse(val.attribute("age").value) == 18 select val;
foreach (var item in query5)
console.writeline("查詢結果query6：");
var query6 = from val in root.elements("stu")
from val2 in val.elements()
where val2.name.localname == "math"
select new ;
foreach (var item in query6)
console.writeline("查詢結果query7:");
var query7 = from val in root.elements("stu") where int.parse(val.element("math").value) < 90 select val;
foreach (var item in query7)
console.writeline("查詢結果query8排序操作:");
var query8 = from val in root.elements("stu") orderby val.attribute("age").value descending select val;
foreach (var item in query8)
console.writeline("查詢結果query9按數學成績降序操作：");
var query9 = from val in root.elements("stu") orderby val.element("math").value descending select new ;
foreach (var item in query9)
console.writeline("查詢結果query10,增加where條件的排序操作");
var query10 = from val in root.elements("stu") where int.parse(val.attribute("age").value) == 18 orderby val.element("math").value descending select new ;
foreach (var item in query10)
console.writeline("查詢結果query11");
var query11 = from val in root.elements("stu") where val.elementsafterself("stu").count() > 4 select val;
foreach (var item in query11)
console.writeline("查詢結構query12");
var query12 = from val in root.elements("stu") where val.elementsbeforeself("stu").count() > 4 select val;
foreach (var item in query12)
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