Questions tagged «iequalitycomparer»

我想了解的场景中IEqualityComparer<T>，并IEquatable<T>应使用。两者的MSDN文档看起来都非常相似。

151 c#  .net  equals  iequalitycomparer  iequatable 

我试图了解IEqualityComparer接口的GetHashCode方法的作用。 以下示例来自MSDN： using System; using System.Collections.Generic; class Example { static void Main() { try { BoxEqualityComparer boxEqC = new BoxEqualityComparer(); Dictionary<Box, String> boxes = new Dictionary<Box, string>(boxEqC); Box redBox = new Box(4, 3, 4); Box blueBox = new Box(4, 3, 4); boxes.Add(redBox, "red"); boxes.Add(blueBox, "blue"); Console.WriteLine(redBox.GetHashCode()); Console.WriteLine(blueBox.GetHashCode()); } catch (ArgumentException …

142 c#  .net  gethashcode  iequalitycomparer 

class Program { static void Main(string[] args) { List<Book> books = new List<Book> { new Book { Name="C# in Depth", Authors = new List<Author> { new Author { FirstName = "Jon", LastName="Skeet" }, new Author { FirstName = "Jon", LastName="Skeet" }, } }, new Book { Name="LINQ in Action", Authors …

120 c#  .net  linq  iequatable  iequalitycomparer 

我的数据库中有一些铃铛号相同。我希望所有这些都没有重复。我创建了一个compare类来完成这项工作，但是该函数的执行会导致该函数的延迟很大，没有区别，从0.6秒到3.2秒！ 我做对了还是必须使用其他方法？ reg.AddRange( (from a in this.dataContext.reglements join b in this.dataContext.Clients on a.Id_client equals b.Id where a.date_v <= datefin && a.date_v >= datedeb where a.Id_client == b.Id orderby a.date_v descending select new Class_reglement { nom = b.Nom, code = b.code, Numf = a.Numf, }) .AsEnumerable() .Distinct(new Compare()) .ToList()); class Compare …

97 c#  linq  iequalitycomparer