can one change the order via parameter?

I have a method which is given the parameter "bool sortAscending". Now I want to use LINQ to create sorted list depending on this parameter. I got then this: var ascendingQuery = from data in dataList orderby data.Property ascending select data; var descendingQuery = from data in dataList orderby data.Property descend

可以通过参数改变顺序吗?

我有一个给出参数“bool sortAscending”的方法。 现在我想用LINQ根据这个参数创建排序列表。 我接着说: var ascendingQuery = from data in dataList orderby data.Property ascending select data; var descendingQuery = from data in dataList orderby data.Property descending select data; 正如你所看到的,这两个查询只有

LINQ OrderBy anonymous object with projection comparer

Ive been trying to get OrderBy in a LINQ statement to work with an anonymous object but have failed by now. I checked these already: Anonymous IComparer implementation C# linq sort - quick way of instantiating IComparer How to sort an array of object by a specific field in C#? I spent a few hours trying different approaches but there has to be something I'm missing. Let's say

LINQ OrderBy具有投影比较器的匿名对象

我一直试图在LINQ语句中使用OrderBy来处理匿名对象,但现在失败了。 我已经检查过这些: 匿名IComparer实现 C#linq排序 - 快速实例化IComparer的方法 如何通过C#中的特定字段对对象数组进行排序? 我花了几个小时尝试不同的方法,但必须有我缺少的东西。 假设有以下课程: public class Product { public int Id {get; set;} public string Name {get; set;} public int Popularity {get; set;} publi

Cross compiled C Windows libcurl doesn't get linked correctly on Ubuntu

I am currently trying to cross compile libcurl in c for Windows 32x on Ubuntu 64x 14.04. After a bit of research I followed these steps: 1) Download library from https://curl.haxx.se/download.html 2) Go into extracted libcurl folder and execute: ./configure --host=i686-w64-mingw32 --build=i686-pc-linux-gnu --prefix=/usr/i686-w64-mingw32/ --enable-static --disable-shared 3) Execute: make

交叉编译的C Windows的libcurl在Ubuntu上没有正确链接

我目前正在尝试在Ubuntu 64x 14.04上为Windows 32x交叉编译libcurl。 经过一些研究后,我按照以下步骤进行: 1)从https://curl.haxx.se/download.html下载库 2)进入解压缩的libcurl文件夹并执行: ./configure --host=i686-w64-mingw32 --build=i686-pc-linux-gnu --prefix=/usr/i686-w64-mingw32/ --enable-static --disable-shared 3)执行:make 4)执行:sudo make install 然后我添加了这些包含语句: #incl

How do I use a Unity IoC container with Template10?

I have an app based on Template10 and want to handle my dependency injection using IoC. I am leaning toward using Unity for this. My app is divided into three assemblies: UI (Universal app) UI Logic (Universal Library) Core Logic (Portable Library). I have these questions: Should I use a single container for the whole app, or create one for each assembly? Where should I create the c

如何在Template10中使用Unity IoC容器?

我有一个基于Template10的应用程序,并希望使用IoC来处理依赖注入。 我倾向于使用Unity来做到这一点。 我的应用程序分为三个程序集: UI(通用应用程序) UI逻辑(通用库) 核心逻辑(便携式图书馆)。 我有这些问题: 我应该为整个应用程序使用单个容器还是为每个程序集创建一个容器? 我应该在哪里创建容器并注册我的服务? 各个组件中的不同类应该如何访问容器? 单身模式? 我已阅读了很多关于DI和IoC的

LINQ Orderby Descending Query

I'm sure this will be a relatively simple one. I have a LINQ query that I want to order by the most recently created date. See: var itemList = from t in ctn.Items where !t.Items && t.DeliverySelection orderby t.Delivery.SubmissionDate descending select t; I have also tried: var itemList = (fr

LINQ Orderby降序查询

我相信这将是一个相对简单的。 我有一个LINQ查询,我想按最近创​​建的日期排序。 看到: var itemList = from t in ctn.Items where !t.Items && t.DeliverySelection orderby t.Delivery.SubmissionDate descending select t; 我也试过: var itemList = (from t in ctn.Items where !t.Items

Do LINQ's Enumerable Methods Maintain Relative Order of Elements?

Say I have List<Foo> foos where the current order of elements is important. If I then apply a LINQ Enumerable method such as GroupBy , Where or Select , can I rely on the resulting IEnumerable<Foo> to iterate in the same relative order as the original list? Yes, for Enumerable methods (LINQ to Objects, which applies to List<T> you mentioned), you can rely on the order of elem

LINQ的Enumerable方法是否保持元素的相对顺序?

假设我有List<Foo> foos ,其中元素的当前顺序很重要。 如果我然后应用LINQ Enumerable方法(如GroupBy , Where或Select ,我可以依赖生成的IEnumerable<Foo>以与原始列表相同的相对顺序进行迭代吗? 是的,对于Enumerable方法(LINQ to Objects,适用于您提到的List<T> ),您可以依赖Select , Where或GroupBy返回的元素的顺序。 对于像ToDictionary或Distinct这样天生无序的事物,情况并非如此。 来

LINQ OrderBy with more than one field

I have a list that I need sorted by two fields. I've tried using OrderBy in LINQ but that only allows me to specify one field. I'm looking for the list to be sorted by the first field and then if there are any duplicates in the first field to sort by the second field. For example I want the results to look like this (sorted by last name then first name). Adams, John Smith, James

LINQ OrderBy具有多个字段

我有一个列表,我需要按两个字段排序。 我试过在LINQ中使用OrderBy,但只允许我指定一个字段。 我正在寻找要按第一个字段排序的列表,然后如果第一个字段中有任何重复项要按第二个字段排序。 例如,我希望结果看起来像这样(按姓氏和名字排序)。 亚当斯,约翰 史密斯,詹姆斯 史密斯,彼得 汤普森,弗雷德 我已经看到你可以使用SQL语法来实现这一点,但我正在寻找一种方法来使用OrderBy方法。 IList<Person>

What's the hardest or most misunderstood aspect of LINQ?

Background: Over the next month, I'll be giving three talks about or at least including LINQ in the context of C# . I'd like to know which topics are worth giving a fair amount of attention to, based on what people may find hard to understand, or what they may have a mistaken impression of. I won't be specifically talking about LINQ to SQL or the Entity Framework except as examples

什么是最困难或最误解的LINQ的方面?

背景:在接下来的一个月中,我将在C#的上下文中提供三个有关或至少包含LINQ的讨论。 我想知道哪些主题值得给予相当多的关注,基于人们可能会觉得难以理解的内容,或者他们可能会误认为什么。 除了作为如何使用表达式树(通常为IQueryable )远程执行查询的示例之外,我不会专门讨论LINQ to SQL或实体框架。 那么,你发现LINQ什么难点? 你在误解方面看到了什么? 例子可能是以下任何一种,但请不要限制自己! C#编译器如

Query a collection using PropertyInfo object in LINQ

I have a method with a signature like this void RefreshMethod<T>(IEnumerable<T> lst, string propertyName) where T:class { Type type = typeof(T); PropertyInfo property = type.GetProperties().Single(u => u.Name == primaryKeyProperty); //query goes here } Now i want to query that collection for getting all the values whose propertyName < 0 In a simple scenario it woul

在LINQ中使用PropertyInfo对象查询集合

我有一个像这样的签名的方法 void RefreshMethod<T>(IEnumerable<T> lst, string propertyName) where T:class { Type type = typeof(T); PropertyInfo property = type.GetProperties().Single(u => u.Name == primaryKeyProperty); //query goes here } 现在我想查询该集合以获取其所有值 propertyName <0 在一个简单的情况下,它将如此简单 lst.where(u=>u.ID<0) 但是在这里我没有这

Strongly typed dynamic Linq sorting

I'm trying to build some code for dynamically sorting a Linq IQueryable<>. The obvious way is here, which sorts a list using a string for the field name http://dvanderboom.wordpress.com/2008/12/19/dynamically-composing-linq-orderby-clauses/ However I want one change - compile time checking of field names, and the ability to use refactoring/Find All References to support later main

强类型动态Linq分类

我正在尝试构建一些用于动态分类Linq IQueryable <>的代码。 显而易见的方法是在这里,它使用字段名称的字符串对列表进行排序 http://dvanderboom.wordpress.com/2008/12/19/dynamically-composing-linq-orderby-clauses/ 不过,我想要一个更改 - 编译时间检查字段名称,以及使用重构/查找所有引用来支持以后的维护。 这意味着我想将字段定义为f => f.Name,而不是字符串。 对于我的具体用途,我想封装一些代