List是线程不安全的,通过一个数组存储数据,当容量达到数组上限时,创建一个新数组,因此存在线程安全问题 SafeList是在做增删改操作时返回一个新的ReadonlyList,所以不存在线程安全问题 /// <summary>/// SafeList is mutable, but it uses immutable data structures to minimize the need for locking./// The provided manipulation /// Exposes a immutable list. Changes are made by copying the lists./// SafeList is /...
string strUrl = ConfigurationManager.AppSettings["SiteUrl"]; string strWebUrl = ConfigurationManager.AppSettings["WebUrl"]; string strListName = ConfigurationManager.AppSettings["ListName"]; string strFieldName = ConfigurationManager.AppSettings["FieldName"];Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(delegate (){using (SPSite site = new SPSite(strUrl)){using (SPWeb web = site.OpenWe...
/// <summary>/// List集合转DataTable/// </summary>/// <typeparam name="T">实体类型</typeparam>/// <param name="list">传入集合</param>/// <returns>返回datatable结果</returns>public static DataTable ListToTable<T>(List<T> list){Type tp = typeof(T);PropertyInfo[] proInfos = tp.GetProperties();DataTable dt = new DataTable();foreach (var item in proInfos){dt.Columns.Add(item.Name, item.PropertyType); /...
公式:List.Skip((pagecount-1)*pagesize).Take(pagesize).ToList() pagecount:页码 pagesize:每页数据量 举个栗子: 前端点击页码 4,每页有50条数据:List.Skip((4-1)*50).Take(50).ToList() 解惑地址:https://blog.csdn.net/swarb/article/details/11165441
定义简单单链表结构 public class ListNode{public int val;public ListNode next;public ListNode(int val = 0, ListNode next = null){this.val = val;this.next = next;}}List转换为单链表,单链表转换为List的转换类 public class ListListNodeConversion{#region List集合转换为ListNodepublic static ListNode ListToListNode(List<int> list){if(list == null){return null;}ListNode head = null, tail = null;forea...
C# 的 List<> 自定义排序 原创链接 using System; using System.Collections.Generic;namespace Solution {class People : IComparable<People>{public People(string name, int age) { Name = name; Age = age; }public string Name { get; set; }public int Age { get; set; }public int CompareTo(People other){if (this.Name != other.Name){return this.Name.CompareTo(other.Name);}else if (this.Age != other.Age){return...
原文连接:https://www.cnblogs.com/weihanli/p/DataTable2List.html' rel='nofollow' target='_blank'> C#将DataTable转化为List </h1><div class="clear"></div><div class="postBody"> C#将DataTable转化为List<T> 在使用三层架构开发一个网站时,希望把DataTable对象转换为List<T>对象,于是在网上找资料,总结一个比较方便的方法来实现——使用反射。 思路: 初始化一个List<T>对象 获取到T所有的属性,初始化一个T对象 遍历...
list.OrderBy(item1 => item1).ToList();//list double 排序for (int i = 0; i < 100;i++){list.RemoveAt(i);//根据下标删除(正向删除)int count=100-1-i;list.RemoveAt(count);//根据下标删除(返向删除)}
1.把List<string>里的集合转换成字符串: List<string> names =newList<string>(){"ccc","xxx","aaa","bbbb"};names.Sort();var result =String.Join(",", names.ToArray());Console.Write(result); 2.字符串怎样转为List<string>集合: string s = "1,2,3"; List<string> list = new List<string>(s.Split(,)); foreach (string t in list) { MessageBox.Show("*" + t + "*"); }
在开发过程中.数组和集合的处理是最让我们担心.一般会用for or foreach 来处理一些操作.这里介绍一些常用的集合跟数组的操作函数.? 首先举例2个集合A,B. List<int> listA = new List<int> {1,2,3,5,7,9}; ?List<int> listB = new List<int> {13,4,17,29,2}; ?listA.AddRange(listB?);把集合A.B合并 ?List<int> Result = listA.Union(listB).ToList<int>(); ? ? ? ? ?//剔除重复项? ?List<int> Result = listA.Concat(listB).To...
Page1点击跳转Page2: private void myListBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { object o = listBox.SelectedItem; if (o == null) return;//这两句必须有 string aaa = o.ToString(); Page2 page2 = new Page2(aaa, whichOne); this.NavigationService.Navigate(page2, UriKind.Relative...
新建modelpublic class Student{public int ID { get; set; }public string Name { get; set; }public string Class {get; set; } }新建listList<Student> stu = new List<Student>();判断name是否重复 /////// 判断name与class是否都重复bool isRepeat = stu.GroupBy(i => i.Name).Where(g => g.Count() > 1).Count() > 0; bool isRepeat = stu.GroupBy(i => new { m.Name, m.Class}).Where(g => g.Count() > 1).Count() > 0;i...
新建窗体应用程序,界面设置如下: 首先编辑添加按钮,在单击事件中编辑,代码如下:1 private void btn1_Click(object sender, EventArgs e) 2 { 3 string name = txt.Text; 4 lst.Items.Add(name); 5 }编辑删除按钮:1 private void btn2_Click(object sender, EventArgs e) 2 { 3 //删除所选项(单项) 4 //判断盒子内内容是否不为空,防止出错 5 if (lst.SelectedIndex > -1) 6 lst.Items...
1.首先在该命名空间下创建一个实体,和在Main方法下List集合,为后续做准备: /// <summary>/// 实体/// </summary>public class Student { public int ID { get; set; }public string Name { get; set; }public int Age { get; set; }public string Location { get; set; }public string Hobby { get; set; }} //创建一个List集合List<Student> Students = new List<Student>();//添加数据Students.Add(new Student...
比如说现在我有一个list, 有一组ID:idList=new List<string>(){"A","B","C","D"} 现在想要利用根据ID进入不同的方法进行处理,将最终结果插入到list 当然,最容易想到的方法是可以遍历ID集合,声明暂时的变量来接收结果,然后Add 但这里想用另一种方式实现,使用ref 当一个变量使用了ref属性之后,便指向了它的地址,能够保证最终改变的结果全都加入到list 写法如下:list.ForEach(o =>{if(o.Id=="A"){GetObjMethodA(ref l...