IList<Model> query = (from item in list where ("," + projectmodel.ids + ",").Contains("," + item.id + ",") select item).ToList<Model>(); 回到顶部 Select(取list中的id列数据,并按逗号分隔成字符串。例:1,2,3,4,5) //方式一 //分成key-value的数组 string[] id = list.Select...
三、删除集合内指定对象 /* 删除集合内所有职业为医生的用户对象 *//* 推荐使用RemoveAll方法批量删除 *//* C#版本1 */list.RemoveAll(item=>item.occupation=="Doctor");/* 也可以使用Remove方法单个删除 *//* C#版本2 */List<User>maps=list.Where(item=>item.occupation=="Doctor").ToList();foreach...
using System; using System.Collections.Generic; using System.Linq; public class Item { public int Id { get; set; } public string Name { get; set; } public List<SubItem> SubItems { get; set; } } public class SubItem { public int Id { get; set; } public string Name { get; se...
Remove(lastNumber); Console.WriteLine("删除最后一项后的集合:"); foreach (var number in numbers) { Console.WriteLine(number); } } } 这段代码中,我们创建了一个包含整数的List集合,然后使用LINQ查询语法或方法语法找到最后一项。最后,使用Remove()方法将最后一项从集合中删除,并通过循环打印出删除最后一项...
ctx.T_Score.DeleteOnSubmit(item); } ctx.T_Student.DeleteOnSubmit(list3); ctx.SubmitChanges(); //还可以推理删除,推理删除需要用Remove方法。由于表的设计不是很完善,这里就不给演示了 //对于在不同的上下文间,需要使用attach方法进行更新,如在一个上下文中查出一个叫黄阳的学生和它的各科成绩,在另一个上下...
(stringiteminscoreQuery) { Console.WriteLine(item); } Console.WriteLine("{0} total names in list", scoreQuery.Count());/* Output: Merge two spreadsheets: Omelchenko, 97, 92, 81, 60 O'Donnell, 75, 84, 91, 39 Mortensen, 88, 94, 65, 91 Garcia, 97, 89, 85, 82 Garcia...
First Returns first item in list. Last Returns last item in list. Range (static) Creates list of numbers, within a specified range. start, length Add Adds element to list. item AddRange Adds each item in given list. items RemoveAt Removes item from list by index. index Remove Removes it...
(stringiteminscoreQuery) { Console.WriteLine(item); } Console.WriteLine("{0} total names in list", scoreQuery.Count());/* Output: Merge two spreadsheets: Omelchenko, 97, 92, 81, 60 O'Donnell, 75, 84, 91, 39 Mortensen, 88, 94, 65, 91 Garcia, 97, 89, 85, 82 Gar...
(ByVal query As IEnumerable(Of String), ByVal message As String) Console.WriteLine(System.Environment.NewLine & message) For Each item As String In query Console.WriteLine(item) Next Console.WriteLine(query.Count & " total names in list") End Sub End Class...
Get next item from List using the current selected item get only first two lines from multiline string using regex Get PCI bus, device, function??? Get pixels from a BitmapSource image using CopyPixels() method Get Process ID from Window Title Get programs currently present in the taskbar....