//Put text files in your solution folder string[] fileA = File.ReadAllLines("names1.txt"); string[] fileB = File.ReadAllLines("names2.txt"); //Simple concatenation and sort. Duplicates are preserved. var concatQuery = fileA.Concat(fileB).OrderBy(s => s); ...
Sometimes you need to find the duplicates in a list. I’m currently developing a little utility that tests code in a word processing document (now posted, you can find it here). Each code snippet in the document has an identifier, and one of the rules that I’m imposing on this code...
Union removes duplicates.Concat does not...However, if there are many duplicates and you don’t need them, the extra processing in Union to remove 2.1K20 基础查询-SQL和Linq相互化 目录SELECT SQL 查询表达式查询语句 SQL SELECT DISTINCT 语句 SQL 查询表达式查询语句 WHERE 和 操作符 BETWEEN 和操作...
将序列的LINQ查询结果转为其他集合,比如使用ToArray or ToList操作 实例:防止重复评估执行 var numbers = new List<int>() {1,2}; List<int> timesTen = numbers .Select (n => n *10) .ToList();// Executes immediately into a List<int>numbers.Clear(); Console.WriteLine (timesTen.Count);// ...
For lists of complex objects, how can the runtime engine perform the comparisons to determine whether or not two objects are duplicates? It can't simply compare the instance variables, as this would, in practice, simply compare the memory addresses of the objects. Instead, for complex...
About error: "Cannot find the object "dbo.xxxx" because it does not exist or you do not have permissions.", in PM window, help please Accessing related tables when no Foreign Key relationship is defined add a new column to list using linq and entity? add a new row on top of the dat...
正如您不能“隐藏”源firstList一样，您通常也不能隐藏其他支持变量。至少，以一种理智的方式。
For lists of complex objects, how can the runtime engine perform the comparisons to determine whether or not two objects are duplicates? It can't simply compare the instance variables, as this would, in practice, simply compare the memory addresses of the objects. Instead, for complex objects...
IEnumerable<string> 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 = "Gar...
This sample uses a filter to find all customers in Washington and then it uses a foreach loop to iterate over the orders collection that belongs to each customer. //c# static void Linq4() { var customers = GetCustomerList(); Console.WriteLine("Customers from Washington and their orders:"...