C# list foreach 删除
WebSep 19, 2024 · 方法一:采用for循环,并且从尾到头遍历. List< string > tempList = new List< string > () { "a", "b", "b", "c" }; for (int i = 0; i < tempList.Count; i++) { if (tempList [i] … WebApr 24, 2024 · C# 编译器会转换代码,接下来的部分会对此进行介绍。 foreach 和数组: 下面展示了简单的 foreach 循环,用于迭代整数数组,然后将每个整数打印输出到控制台中: C# int[] array = new int[] {1, 2, 3, 4, 5, 6}; foreach (int item in array) { Console.WriteLine (item); } 在此代码中,C# 编译器为 for 循环创建了等同的 CIL: C#
C# list foreach 删除
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WebRemarks. The Action is a delegate to a method that performs an action on the object passed to it. The elements of the current List are individually passed to the Action delegate. This method is an O ( n) operation, where n is Count. Modifying the underlying collection in the body of the Action delegate is not supported and causes ... WebC# SQL数据库中大量记录的Linq查询和Foreach,c#,entity-framework,linq,C#,Entity Framework,Linq,我正在使用实体框架和Linq。我需要对我的对象的两个属性进行查询 我在数据库中有这个对象,大约有200000条记录: public class DeviceState { public int ID { get; set; } public DateTime TimeStamp { get; set; } public string StatusCode { get; set ...
WebJan 6, 2024 · 一、C#遍历删除的两种方式 观察如下代码:我们希望去除80分一下的同学名称; Dictionary< string, int > students= new Dictionary< string, int > (); students.Add ( "xiaoming", 90 ); students.Add ( "xiaohong", 80 ); students.Add ( "xiaolan", 70 ); foreach (KeyValuePair< string, int > stu in students) { if (stu.Value< 80 ) { students.Remove … WebApr 18, 2016 · If you want to remove in range (not in the entire list ), just modify for loop: // No Enumarable.Range (1, 10) - put them into "for" for (int i = Math.Min (11, safePendingList.Count - 1); i >= 1; --i) if (condition) safePendingList.RemoveAt (i); Or if you have to remove items in forward looping:
WebDec 16, 2024 · C#实现在foreach遍历中删除集合中的元素 (方法总结) 目录 方法一:采用for循环,并且从尾到头遍历 方法二:使用递归 方法三:通过泛型类实现IEnumerator … WebSep 20, 2024 · 集合集合相比较与数组的好处:长度可以任意改变,类型随便。所以可以将集合看成“长度可变,具有多种方法的数组”1、ArrayList集合2、Hashtable集合(键值对集合)3、List泛型集合4、字典集合1、ArryList集合引用命名空间System.CollectionArrayList方法1、添加2、删除3、插入4、反转5、排序6、判断是否包含1 ...
Web1.先用foreach遍历删除姓名为Tang的学生,代码如下: foreach (var stu in stuList) { if (stu.Name == "Tang") stuList.Remove (stu); } 会报如下错误: 因为在foreach中删除元素时,每一次删除都会导致集合的大小和元素索引值发生变化,从需导致在foreach中删除元素会出现异常。 2.用for正序遍历删除,代码如下:
Web有句俗语: 百姓日用而不知。我们c#程序员很喜欢,也非常习惯地用foreach。今天呢,我就带大家一起探索foreach,走,开始我们的旅程。 一、for语句用地好好的,为什么要提供一个foreach? for (var i = 0; i < 1… denso warranty policyWebFirst type: List someList = foreach (string s in someList) { } Other Way: List someList = someList.ForEach (delegate (string s) { }); I suppose off the top of my head, that instead of the anonymous delegate I use above, you'd have a reusable … ffxi npc shopsWebusing System; using System.Collections.Generic; namespace RemoveItemsWhileIterating { class Program { static void Main(string[] args) { List numbers = new List { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; // Remove odd numbers from the list while iterating through it for (int i = numbers.Count - 1; i >= 0; i--) { if (numbers[i] % 2 != 0) { numbers.RemoveAt(i); … denso wave usb device