publicstaticIEnumerable<XElement>FindAllElementsWithAttribute(XElement documentRoot,stringelementName,stringattributeName,stringvalue){returnfromelindocumentRoot.Elements(elementName)where(string)el.Element(attributeName) ==valueselectel; } 为了执行此任务而编写代码来手动遍历 XML 文档会带来重重困难。
("The two folders are not the same"); }// Find the common files. It produces a sequence and doesn't// execute until the foreach statement.varqueryCommonFiles = list1.Intersect(list2, myFileCompare);if(queryCommonFiles.Any()) { Console.WriteLine($"The following files are in...
Where previous versions of the documentation presented shared concepts in topics that covered both languages, the current documentation presents each language in it's own topic.How to: Find the Set Difference Between Two Lists (LINQ) (Visual Basic) How to: Find the Set Difference Between Two ...
var fileList = from file in Directory.GetFiles(startFolder, "*.*", SearchOption.AllDirectories) let fileInfo = new FileInfo(file) select fileInfo; // Create the regular expression to find all things "Visual". System.Text.RegularExpressions.Regex searchTerm = new System.Text...
How to: Query for Sentences that Contain a Specified Set of Words (LINQ) How to: Query for Characters in a String (LINQ) How to combine LINQ queries with regular expressions How to: Find the Set Difference Between Two Lists (LINQ) ...
Set(p => p.Name, product.Name); if (updatePrice) statement = statement.Set(p => p.UnitPrice, product.UnitPrice); statement.Update(); You're not limited to a single record update. For example, we could discontinue all the products that are no longer in stock: using LinqToDB; using...
Set(p => p.Name, product.Name); if (updatePrice) statement = statement.Set(p => p.UnitPrice, product.UnitPrice); statement.Update(); You're not limited to a single record update. For example, we could discontinue all the products that are no longer in stock: using LinqToDB; using...
// Mapping a list from type A to type B.varcats = dogs.Select(dog => dog.TurnIntoACat());// Using the query syntax.varqueryCats =fromdogindogsselectdog.TurnIntoACat();// Summing the lengths of a set of strings.intseed =0;intsumOfStrings = strings.Aggregate(seed, (partialSum, ...
假设studentLst里已经有一些数据,然后需要查询出年纪小于25的学生。有很多方法,可以循环列表挑出age<25的学生,可以使用List的FindAll,Where等方法,看起来像下面这样(注意只有在访问list中数据时,才会去执行过滤条件查询,延迟查询) varlist= studentLst.Where<Student>(s => s.Age <25);foreach(varitem inlist) ...
/// /// This class implements IComparable in order to /// be able to compare different Pet objects. /// class Pet : IComparable<Pet> { public string Name { get; set; } public int Age { get; set; } /// /// Compares this Pet's age to another Pet's age. /// /...