foreach (var item in quary.ToList()) { //取值item } 回到顶部 Where条件筛选。 //将provice=吉林的筛选出来。 list = list.Where(x => x.provice == "吉林").ToList(); //将包含1,5条件的数据筛选出来,相当于sql里的in用法:select * from 表 where user_type in (1,5) list= list.Where...
varfilteredItems = myItems.Where(item => item.Foo); 比这更简洁: C# varfilteredItems =fromiteminmyItemswhereitem.Fooselectitem; API 语法是否只是一种更简洁的方式来执行查询语法? 不。 查询语法允许使用let子句,这样就可以在表达式的作用域内引入和绑定变量,并在表达式的后续部分中使用它。 只能使用 API...
' Merge the data by using an anonymous type.' Note the dynamic creation of a list of integers for the' ExamScores member. We skip 1 because the first string' in the array is the student ID, not an exam score.DimqueryNamesScores2 =FromnameLineInn...
Dim dataList As New List(Of String)() From {"Apple", "Banana", "Orange", "Grape", "Mango"} Dim queryResult = dataList.Where(Function(x) x.StartsWith("A") AndAlso x.Length > 5) For Each item In queryResult Console.WriteLine(item) Next ...
List<int> list1=new List<int>(){1,2,3,4,5,6}; List<int> list2=new List<int>(){6,4,2,7,9,0}; var query=from item1 in list1 join item2 in list2 on item1 equals item2 select item2; foreach(var q in query)
Next' Group files according to their size,' leaving out the ones under 200KDimsizeGroups =FromfileAsSystem.IO.FileInfoInfileList _Wherefile.Length >0_LetgroupLength = file.Length /100000_GroupfileBygroupLengthIntofileGroup =Group_WheregroupLength >=2_OrderBy...
(ByVal query As IEnumerable(Of String), ByVal message As String) Console.WriteLine(System.Environment.NewLine & message) For Each item As String In query Console.WriteLine(item) Next Console.WriteLine(query.Count & " total names in list") End Sub End Class...
Dim cities = From item In customers Select item.City Distinct Skip clauseOptional. A Skip clause bypasses a specified number of elements in a collection and then returns the remaining elements. For example:VB Copy ' Returns a list of customers. The first 10 customers ' are ignored and the...
{ static void Main() { string[] names = { "Burke", "Connor", "Frank", "Everett", "Albert", "George", "Harris", "David" }; IEnumerable<string> query = from s in names where s.Length == 5 orderby s select s.ToUpper(); foreach (string item in query) Console.WriteLine(item)...
EmailDomainBlockList,邮箱校验需要用到的黑名单域名,英文逗号分隔,每个元素支持正则表达式,且黑名单优先级高于白名单,若未配置,则不启用邮箱校验黑白名单 publicStartup(IConfigurationconfiguration){configuration.AddToMasuitTools();// 若未调用,则默认自动尝试加载appsettings.json} ...