("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($"The following files are in ...
("The two folders are not the same"); }// Find the common files. It produces a sequence and doesn't// execute until the foreach statement.varqueryCommonFiles = list1.Intersect(list2, myFileCompare);if(queryCommonFiles.Any()) { Console.WriteLine($"The following files are ...
var commonNamesQuery = fileA.Intersect(fileB); OutputQueryResults(commonNamesQuery, "Merge based on intersect:"); // Find the matching fields in each list. Merge the two // results by using Concat, and then // sort using the default string comparer. string nameMatch ...
Console.WriteLine("find all result:" + query2.Count); Console.ReadKey(); } 结果是: construct list finished. linq ticks:1214 linq find result:8333767 find all ticks:7379030 find all result:8333767 今天在网上,Google了半天List的Find、FindAll机制,无果!晚上回来,写了一段小Demo; 发现Linq的性能更...
虽然List里的linq方法(其实是Enumarable的)大部分比较简单 ,但是如果能够灵活运用也是提高code质量,可读性和coding能力的有效途径。而且其中有些方法,例如 Join, 光看注释可能会有点懵。 最近把他们go through了一遍。代码如下。 usingSystem; usingSystem.Collections.Generic; ...
List<int> list3 = list2.Except(list1).ToList(); foreach(intiinlist3) { MessageBox.Show(i.ToString()); } 合并两个数组,并去掉重复元素,然后排序(C#) List<int> numbers1 =newList<int>() {5,4,1,3,9,8,6,7,12,10}; List<int> numbers2 =newList<int>() {15,14,11,13,19,18,...
var query = from k in list where k.KeywordType != 5 select k;stop.Stop();Console.WriteLine("linq ticks:" + stop.Elapsed.Ticks);Console.WriteLine("linq find result:" + query.Count());var stop2 = new Stopwatch();stop2.Start();var query2 = list.FindAll(_ => _.KeywordType != ...
4.去重,以List中某元素为基准,去除次元素相同的记录 List<MouldDMDXInfo> listBM_Distinct = listAllMouldBM.Where((m, i) => listAllMouldBM.FindIndex(z => z.MouldNo == m.MouldNo) == i).ToList(); //去除MouldNo相同的记录 5.以List中某元素为查询条件,判断List中是否存在数据 ...
which has a type ofIEnumerable<int>. If you're familiar with the genericIEnumerable<T>interface, you know that it doesn't have aWheremethod. However, if you invoke the IntelliSense completion list in the Visual Studio IDE, you see not only aWheremethod, but many other methods such asSele...
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