test <\/p>\n
classProgram\n{\n#region \u793a\u4f8b1\uff1a\u4e0d\u4f7f\u7528LINQ\u67e5\u8be2\u6570\u7ec4\nstaticvoidMain(string[] args)\n{\nint[] nums= { 1, 7, 2, 6, 5, 4, 9, 13, 20 };\nList<int> list=newList<int>();\nforeach (intiteminnums)\n{\n if (item%2!=0)\n list.Add(item);\n}\nlist.Sort();\nlist.Reverse();\nforeach (intiteminlist)\n{\nConsole.WriteLine(item);\n}\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b2\uff1a\u4f7f\u7528LINQ\u6280\u672f\u67e5\u8be2\u6570\u7ec4\nstaticvoidMain(string[] args)\n{\nint[] nums= { 1, 7, 2, 6, 5, 4, 9, 13, 20 };\nvarlist=fromnuminnums\nwherenum%2!=0\norderbynumdescending\nselectnum;\nforeach (intiteminlist)\n{\nConsole.WriteLine(item);\n}\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b3\uff1a\u6269\u5c55\u65b9\u6cd5Select()\u5e94\u7528\nstaticvoidMain(string[] args)\n{\nint[] nums= { 1, 7, 2, 6, 5, 4, 9, 13, 20 };\nvarlist=nums.Select(item=>item*item);\nforeach (intiteminlist)\n{\nConsole.WriteLine(item);\n}\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b4\uff1a\u6269\u5c55\u65b9\u6cd5Where()\u5e94\u7528\nstaticvoidMain(string[] args)\n{\nint[] nums= { 1, 7, 2, 6, 5, 4, 9, 13, 20 };\nvarlist=nums\n.Where(item => item % 2 == 0)\n.Select(i => i * i);\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b5\uff1a\u6269\u5c55\u65b9\u6cd5OrderBy()\u5e94\u7528\nstaticvoidMain(string[] args)\n{\nint[] nums= { 1, 7, 2, 6, 5, 4, 9, 13, 20 };\nvarlist=nums\n.Where(item => item % 2 == 0)\n.Select(i => i * i)\n.OrderBy(item => item);\nforeach (intiinlist)\n{\nConsole.WriteLine(i);\n}\nConsole.ReadLine();\n}\nstaticvoidMain(string[] args)\n{\nstring[] nums= { "\u5f20\u52c7", "\u738b\u7426", "\u5218\u9759", "\u8d75\u946b\u946b",\n"\u675c\u4e3d", "\u9a6c\u4fca\u624d", "\u90a3\u82f1", "\u6210\u9f99", };\nvarlist=nums\n.Where(item => item.Length == 2)\n.Select(item => item)\n.OrderByDescending(item => item.Substring(0, 1));\nforeach (stringiteminlist)\n{\nConsole.WriteLine(item);\n}\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b6\uff1a\u6269\u5c55\u65b9\u6cd5GroupBy()\u5e94\u7528\nstaticvoidMain(string[] args)\n{\nstring[] nums= { "\u5f20\u52c7", "\u738b\u7426", "\u5218\u9759", "\u8d75\u946b\u946b",\n"\u675c\u4e3d", "\u9a6c\u4fca\u624d", "\u90a3\u82f1", "\u6210\u9f99","\u738b\u4e3d", "\u675c\u5b87","\u9a6c\u6653","\u5218\u4e3d","\u9a6c\u5927\u54c8",};\nvarlist=nums\n.Where(item => item.Length == 2)\n.Select(item => item)\n.GroupBy(item => item.Substring(0, 1));\nforeach (vargroupIteminlist)\n{\nConsole.WriteLine("-------------------");\nConsole.WriteLine("\u5206\u7ec4\u5b57\u6bb5\uff1a{0}", groupItem.Key);\nforeach (varitemingroupItem)\n{\nConsole.WriteLine(item);\n}\n}\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b7\uff1a\u65ad\u70b9\u8c03\u8bd5LINQ\u7684\u67e5\u8be2\u65f6\u673a\nstaticvoidMain(string[] args)\n{\nint[] nums= { 1, 7, 2, 6, 5, 4, 9, 13, 20 };\nvarlist=nums\n.Where(item => item % 2 == 0)\n.Select(item => item * item)\n.OrderBy(item => item);\nforeach (intiinlist)\n{\nConsole.WriteLine(i);\n}\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b8\uff1a\u67e5\u8be2\u7684\u7acb\u5373\u6267\u884c\nstaticvoidMain(string[] args)\n{\nint[] nums= { 1, 7, 2, 6, 5, 4, 9, 13, 20 };\nvarlist=nums\n.Where(item => item % 2 == 0)\n.Select(item => item * item)\n.OrderBy(item => item)\n.Count();\nConsole.WriteLine(list.ToString ());\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b9\uff1afrom\u5b50\u53e5\u7684\u7b80\u5355\u4f7f\u7528\nstaticvoidMain(string[] args)\n{\nArrayListvalues=newArrayList();\nfor (inti=0; i<10; i++) { values.Add(i); }\nvarlist=fromintiteminvalues\nwhereitem%2==0\nselectitem;\nforeach (intiteminlist) { Console.WriteLine(item); }\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b10\uff1a\u590d\u5408from\u5b50\u53e5\u7684\u4f7f\u7528\nstaticvoidMain(string[] args)\n{\nStudentobj1=newStudent()\n{\nStuId=1001,\nStuName="\u5b66\u54581",\nScoreList=newList<int>() { 90, 78, 54 }\n};\nStudentobj2=newStudent()\n{\nStuId=1002,\nStuName="\u5b66\u54582",\nScoreList=newList<int>() { 95, 88, 90 }\n};\nStudentobj3=newStudent()\n{\nStuId=1003,\nStuName="\u5b66\u54583",\nScoreList=newList<int>() { 79, 76, 89 }\n};\n\u5c06\u5b66\u5458\u5c01\u88c5\u5230\u96c6\u5408\u4e2d\nList<Student> stuList=newList<Student>() { obj1, obj2, obj3 };\n\u67e5\u8be2\u6210\u7ee9\u5305\u542b95\u5206\u4ee5\u4e0a\u7684\u5b66\u5458\nvarresult=fromstuinstuList\nfromscoreinstu.ScoreList\nwherescore>=95\nselectstu;\n\u663e\u793a\u67e5\u8be2\u7ed3\u679c\nforeach (variteminresult)\n{\nConsole.WriteLine(item.StuName);\n}\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b11\uff1a\u591a\u4e2afrom\u5b50\u53e5\u67e5\u8be2\u7684\u4f7f\u7528\nstaticvoidMain(string[] args)\n{\nStudentobj1=newStudent() { StuId=1001, StuName="\u5b66\u54581" };\nStudentobj2=newStudent() { StuId=1009, StuName="\u5b66\u54589" };\nStudentobj3=newStudent() { StuId=1012, StuName="\u5b66\u545812" };\nStudentobj4=newStudent() { StuId=1003, StuName="\u5b66\u54583" };\nStudentobj5=newStudent() { StuId=1019, StuName="\u5b66\u545819" };\nStudentobj6=newStudent() { StuId=1006, StuName="\u5b66\u54586" };\nList<Student> stuList1=newList<Student>() { obj1, obj2, obj3 };\nList<Student> stuList2=newList<Student>() { obj4, obj5, obj6 };\n\u67e5\u8be2\u5b66\u597d\u5927\u4e8e1010\u7684\u5b66\u5458\nvarresult=fromstu1instuList1\nwherestu1.StuId>=1010\nfromstu2instuList2\nwherestu2.StuId>=1010\nselectnew { stu1, stu2 };\n\u663e\u793a\u67e5\u8be2\u7ed3\u679c\nforeach (variteminresult )\n{\nConsole.WriteLine(item.stu1.StuName+" "+item.stu1.StuId);\nConsole.WriteLine(item.stu2.StuName+" "+item.stu2.StuId);\n}\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b12\uff1a\u805a\u5408\u51fd\u6570Count\nstaticvoidMain(string[] args)\n{\nStudentobj1=newStudent() { StuId=1001, StuName="\u5b66\u54581" };\nStudentobj2=newStudent() { StuId=1009, StuName="\u5b66\u54589" };\nStudentobj3=newStudent() { StuId=1012, StuName="\u5b66\u545812" };\nStudentobj4=newStudent() { StuId=1003, StuName="\u5b66\u54583" };\nStudentobj5=newStudent() { StuId=1019, StuName="\u5b66\u545819" };\nStudentobj6=newStudent() { StuId=1006, StuName="\u5b66\u54586" };\nList<Student> stuList=newList<Student>() { obj1, obj2, obj3, obj4, obj5, obj6 };\nvarcount1= (fromcinstuList\nwherec.StuId>1010\nselectc).Count();\nvarcount2=stuList.Where(c=>c.StuId>1010).Count();\nConsole.WriteLine("count1={0} count2={1}",count1,count2);\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b13\uff1a\u805a\u5408\u51fd\u6570Max\u3001Min\u3001Average\nstaticvoidMain(string[] args)\n{\nStudentobj1=newStudent() { StuId=1001, Age=22, StuName="\u5b66\u54581" };\nStudentobj2=newStudent() { StuId=1009, Age=21, StuName="\u5b66\u54589" };\nStudentobj3=newStudent() { StuId=1012, Age=25, StuName="\u5b66\u545812" };\nStudentobj4=newStudent() { StuId=1003, Age=23, StuName="\u5b66\u54583" };\nStudentobj5=newStudent() { StuId=1019, Age=27, StuName="\u5b66\u545819" };\nStudentobj6=newStudent() { StuId=1006, Age=24, StuName="\u5b66\u54586" };\nList<Student> stuList=newList<Student>() { obj1, obj2, obj3, obj4, obj5, obj6 };\nvarmaxAge= (fromsinstuList\nselects.Age).Max();\nvarminAge=stuList\n.Select(s => s.Age).Min();\nvaravgAge= (fromsinstuList\nselects.Age).Average();\nvarsumAge= (fromsinstuList\nselects.Age).Sum();\nConsole.WriteLine("maxAge={0} minAge={1} avgAge={2} sumAge={3}",\nmaxAge, minAge, avgAge,sumAge);\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b14\uff1a\u6392\u5e8f\u7c7bThenBy\u7684\u4f7f\u7528\nstaticvoidMain(string[] args)\n{\nStudentobj1=newStudent() { StuId=1001, Age=22, StuName="\u5b66\u54581" };\nStudentobj2=newStudent() { StuId=1009, Age=21, StuName="\u5b66\u54589" };\nStudentobj3=newStudent() { StuId=1012, Age=25, StuName="\u5b66\u545812" };\nStudentobj4=newStudent() { StuId=1003, Age=23, StuName="\u5b66\u54583" };\nStudentobj5=newStudent() { StuId=1019, Age=27, StuName="\u5b66\u545819" };\nStudentobj6=newStudent() { StuId=1006, Age=24, StuName="\u5b66\u54586" };\nList<Student> stuList=newList<Student>() { obj1, obj2, obj3, obj4, obj5, obj6 };\nvarstus1=fromsinstuList\norderbys.StuName, s.Age, s.StuId\nselects;\nvarstus2=stuList\n.OrderBy(s => s.StuName)\n.ThenBy(s => s.Age)\n.ThenBy(s => s.StuId)\n.Select(p => p);\nforeach (varsinstus1)\n{\nConsole.WriteLine(s.StuName);\n}\nConsole.WriteLine("----------------------");\nforeach (varsinstus2)\n{\nConsole.WriteLine(s.StuName);\n}\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b15\uff1a\u5206\u533a\u7c7b\u67e5\u8be2\nstaticvoidMain(string[] args)\n{\nint[] nums= { 1, 2, 3, 4, 5, 6, 7, 8, 9 };\nvarlist1=nums.Skip(1).Take(3);\nvarlist2=nums.SkipWhile(i=>i%3!=0)\n.TakeWhile(i => i % 2 != 0);\nforeach (variteminlist1) { Console.WriteLine(item); }\nConsole.WriteLine("------------");\nforeach (variteminlist2) { Console.WriteLine(item); }\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b16\uff1a\u96c6\u5408\u7c7b\u67e5\u8be2Distinct\nstaticvoidMain(string[] args)\n{\nint[] nums= { 1, 2, 2, 6, 5, 6, 7, 8, 8 };\nvarlist=nums.Distinct();\nforeach (variteminlist) { Console.WriteLine(item); }\nConsole.ReadLine();\n}\n#endregion\n#region \u793a\u4f8b17\uff1a\u751f\u6210\u7c7b\u67e5\u8be2\nstaticvoidMain(string[] args)\n{\nvarnums1=Enumerable.Range(1, 10);\nvarnums2=Enumerable.Repeat("LINQ best\uff01", 10);\nforeach (variteminnums1) { Console.WriteLine(item); }\nConsole.WriteLine("------------");\nforeach (variteminnums2) { Console.WriteLine(item); }\nConsole.ReadLine();\n}\n#endregion\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"