Enumerable.Distinct 方法 参考 反馈 定义 命名空间: System.Linq 程序集: System.Linq.dll 返回序列中的非重复元素。 重载 展开表 Distinct<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>) 通过使用指定的IEqualityComparer<T>对值进行比较,
LINQ定义在using System.Linq;命名空间下。 LINQ中的Enumerable接口的扩展方法定义在System.Linq命名空间中。 该命名空间中定义了超过了40个查询运算符。 所有的定义都是静态扩展方法(static extension methods)。 使用LINQ项目必须基于.NET Framework 3.5以上。 LINQ的作用(为什么要使用LINQ)# 更加高效、快速、简单的查...
That works fine, EXCEPT I don't get distinct results back. If I have 10 people with S for the last name, then I get 10 instances of "S" in my DDL. I'm thinking that my distinct statement is being applied to the last name, not the FIRST LETTER of the last name. ...
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distinct([selector]) Creates a copy of the collection and the underlying array with duplicates removed. The optional selector is used to compare two elements for equality var newCollection = collection.distinct(function(x, y) { return x === y; }); ...
Linq to sql using distinct on individual values Linq to SQL within a Foreach loop LINQ to SQL; Distinct, Take and OrderByDescending LINQ to SQL: Generic OrderBy Linq Update List marking duplicates based of a columns in the list . Linq where and nullable int column LINQ Where Case Statement...
Example, a database table is know to have duplicate rows of data where the duplicates are by multiple columns in a table which requires a business user to make decisions on which data is valid and which data is not valid along with the possibilities to merge data then delete extra...
I am looking for a clean solution to remove all duplicates from a List(of t) collection.For exampleprettyprint 复制 Class Person Public Property FirstName As String Public Property LastName As String Public Property Gender As GenderEnum Public Property Age As Integer Public Sub New(Byval ...
I get the error on the last line, I'm not enitrely sure why? Can anyone see where I am going wrong? many thanks All replies (1) Saturday, December 13, 2008 2:37 PM ✅Answered If you new to linq you should watch the videos athttp://www.asp.net/learn/linq-videos/. ...
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS1928: 'System.Linq.IQueryable<AnonymousType#1>' does not contain a definition ...