I have the following Auto Property [DefaultValue(true)] public bool RetrieveAllInfo { get; set; } when I try to use it inside the code i find the default false for is false I assume this is the default value to a bool variable, does anyone have a clue what is wrong!? The DefaultValue attribute is only used to tell the Visual Studio Designers (for example when designing a form) what the defaul
我有以下的自动属性 [DefaultValue(true)] public bool RetrieveAllInfo { get; set; } 当我尝试在代码中使用它时，我发现默认的false为false我假设这是默认值到一个bool变量，没有人有线索什么是错的！？ DefaultValue属性仅用于告诉Visual Studio设计者（例如，在设计表单时）属性的默认值是什么。 它不会在代码中设置属性的实际默认值。 更多信息在这里：http：//support.microsoft.com/kb/311339 [DefaultValue]仅
everyone. I'm trying to learn how to write LINQ queries, and am wondering if you can help me kick-start it with some resource recommendations. I am trying to learn how to write simple and complex queries that look like this, which I think is standard LINQ syntax ... from b in blahCollection join f in fooCollection where b.Field == someValue select new { b.Field, f.field } ... and this, t
大家。 我正在尝试学习如何编写LINQ查询，并且想知道是否可以通过一些资源建议来启动它。 我正在努力学习如何编写简单和复杂的查询，看起来像这样，我认为这是标准的LINQ语法... from b in blahCollection join f in fooCollection where b.Field == someValue select new { b.Field, f.field } ...和这个，但我不知道这个语法是什么调用。 （这是什么叫什么？） var plan = blahCollection.Find(b => b.Field == someV
Saw a post about hidden features in C# but not a lot of people have written linq/lambdas example so... I wonder... What's the coolest (as in the most elegant) use of the C# LINQ and/or Lambdas/anonymous delegates you have ever saw/written? Bonus if it has went into production too! The LINQ Raytracer certainly tops my list =) I'm not quite sure if qualifies as elegant but it is mos
看了一篇关于C＃隐藏功能的文章，但并不是很多人写过linq / lambdas示例，所以......我想知道...... 什么是最酷的（如最优雅的）使用C＃LINQ和/或Lambdas /匿名代表你曾见过/写过的代码？ 如果它已投入生产，也会获得奖励！ LINQ Raytracer当然在我的列表中排名第一） 我不太确定它是否合格，但它绝对是我见过的最酷的表情表达！ 哦，而且要非常清楚; 我没有写（卢克霍班做的） 一些基本功能： public static class
I took the plunge this afternoon and began studying LINQ, so far just mucking around with LINQ on collections. One of the first things I tried was to implement QSort. Now -- ignoring the fact that I could just use an ORDERBY and that this is a very silly qsort implementation -- what I came up with was this: public class lqsort { public static List<int> QSLinq(List<int> _items)
今天下午，我参加了这次尝试，并开始学习LINQ，到目前为止只是在LINQ上进行收集。 我尝试的第一件事就是实现QSort。 现在 - 忽略了我可以使用ORDERBY并且这是一个非常愚蠢的qsort实现的事实 - 我想到的是这样的： public class lqsort { public static List<int> QSLinq(List<int> _items) { if (_items.Count <= 1) return _items; int _pivot = _items[0]; L
So I came across an interesting problem today. We have a WCF web service that returns an IList. Not really a big deal until I wanted to sort it. Turns out the IList interface doesn't have a sort method built in. I ended up using the ArrayList.Adapter(list).Sort(new MyComparer()) method to solve the problem but it just seemed a bit "ghetto" to me. I toyed with writing an exte
所以我今天遇到了一个有趣的问题。 我们有一个返回IList的WCF Web服务。 直到我想对它进行分类才算真正的大事。 原来IList接口没有内置的排序方法。 我结束了使用ArrayList.Adapter(list).Sort(new MyComparer())的方法来解决这个问题，但它只是似乎有点“贫民窟”给我。 我玩弄了一个扩展方法，同时继承自IList并实现我自己的Sort（）方法以及转换为List，但没有一个看起来过于优雅。 所以我的问题是，有没有人有一个优
I have a DataTable with a Name column. I want to generate a collection of the unique names ordered alphabetically. The following query ignores the order by clause. var names = (from DataRow dr in dataTable.Rows orderby (string)dr["Name"] select (string)dr["Name"]).Distinct(); Why does the orderby not get enforced? To make it more readable and maintainable, you can also split it
我有一个Name列DataTable 。 我想生成按字母顺序排列的唯一名称的集合。 以下查询忽略了order by子句。 var names = (from DataRow dr in dataTable.Rows orderby (string)dr["Name"] select (string)dr["Name"]).Distinct(); 为什么orderby没有得到执行？ 为了使其更具可读性和可维护性，您还可以将其拆分为多个LINQ语句。 首先，将您的数据选择到一个新列表中，我们称之为x1 ，如果需要，进行投影 接下
I have been working with a string[] array in C# that gets returned from a function call. I could possibly cast to a Generic collection, but I was wondering if there was a better way to do it, possibly by using a temp array. What is the best way to remove duplicates from a C# array? 您可以使用LINQ查询来执行此操作： int[] s = { 1, 2, 3, 3, 4}; int[] q = s.Distinct().ToArray(); Here is the Hash
我一直在使用C＃中的一个string[]数组，它从函数调用中返回。 我可能投到一个Generic集合，但我想知道是否有更好的方法来做到这一点，可能通过使用临时数组。 从C＃数组中删除重复项的最佳方法是什么？ 您可以使用LINQ查询来执行此操作： int[] s = { 1, 2, 3, 3, 4}; int[] q = s.Distinct().ToArray(); 这里是HashSet <string>方法： public static string[] RemoveDuplicates(string[] s) { HashSet<string
Typical way of creating a CSV string (pseudocode): Create a CSV container object (like a StringBuilder in C#). Loop through the strings you want to add appending a comma after each one. After the loop, remove that last superfluous comma. Code sample: public string ReturnAsCSV(ContactList contactList) { StringBuilder sb = new StringBuilder(); foreach (Contact c in contactList)
创建CSV字符串的典型方法（伪代码）： 创建一个CSV容器对象（如C＃中的StringBuilder）。 循环遍历要添加的字符串，并在每个字符后添加逗号。 循环后，删除最后多余的逗号。 代码示例： public string ReturnAsCSV(ContactList contactList) { StringBuilder sb = new StringBuilder(); foreach (Contact c in contactList) { sb.Append(c.Name + ","); } sb.Remove(sb.Length - 1, 1);
This question already has an answer here: LINQ's Distinct() on a particular property 17 answers Try this var filteredData = data.GroupBy( d=> d.Name).SelectMany(grouping => grouping.First()); Depending upon LinqProvider for the database (IQueryable implementation), The query may run on database, or on client side( if so, there will be memory/network bandwidth issues). In some ca
这个问题在这里已经有了答案： LINQ对特定属性的Distinct（）17的答案 尝试这个 var filteredData = data.GroupBy( d=> d.Name).SelectMany(grouping => grouping.First()); 根据数据库的LinqProvider（IQueryable实现），查询可以运行在数据库上，也可以运行在客户端（如果是这样，将会有内存/网络带宽问题）。 在某些情况下，并不是所有的Linq构造都被支持。 尝试： datatable.GroupBy(x => x.Name);
This question already has an answer here: LINQ's Distinct() on a particular property 17 answers Linq distinct not working correctly 2 answers Distinct() doesn't work 4 answers
这个问题在这里已经有了答案： LINQ对特定属性的Distinct（）17的答案 Linq截然不同的工作正确2答案 Distinct（）不起作用4个答案