Dynamic lambda using an expression builder for select

I am trying to write a dynamic select statement. I have the following: public class MainList { public string Prop1{ get; set; } public string Prop2{ get; set; } public string Prop3{ get; set; } } public class SearchObject { public string Prop1{ get; set; } } I want build the expression like the following var newList = MainList.Select(n => new SearchObject { Prop1 =

动态lambda使用表达式构建器进行select

我正在尝试编写一个动态选择语句。 我有以下几点: public class MainList { public string Prop1{ get; set; } public string Prop2{ get; set; } public string Prop3{ get; set; } } public class SearchObject { public string Prop1{ get; set; } } 我想要建立如下的表达式 var newList = MainList.Select(n => new SearchObject { Prop1 = n.Prop1}); 我正在使用的代码创建一个基于MainLi

C# LINQ build expression with anonymous type

I have code which builds list only with one property "Name". How to modify the code so it can build list with two properties "Name" and "Test_Result" I know that anonymous type can be used to perform this, but how to put them to dynamic expression? here is my code: string item = "Name"; string item2 = "Test_Result"; Type studentType = typeof(Student); ParameterEx

C#LINQ使用匿名类型构建表达式

我有代码只建立一个属性“名称”的列表。 如何修改代码,以便它可以建立具有两个属性“名称”和“Test_Result”的列表我知道可以使用匿名类型来执行此操作,但是如何将它们设置为动态表达式? 这里是我的代码: string item = "Name"; string item2 = "Test_Result"; Type studentType = typeof(Student); ParameterExpression itemParam = Expression.Parameter(studentType, item); MemberInfo itemProperty = studentType.GetPro

Dynamic recursive lambda expressions

I want to create dynamic lambda expressions so that I can filter a list using a set of filtering parameters. This is what I have so far: The expression is built using the methods bellow, where T is the object type of the list public static Expression<Func<T, bool>> GetExpression<T>(IList<DynamicFilter> filters) { if (filters.Count == 0) retu

动态递归lambda表达式

我想创建动态lambda表达式,以便我可以使用一组过滤参数来过滤列表。 这是我到目前为止: 该表达式使用下面的方法构建,其中T是列表的对象类型 public static Expression<Func<T, bool>> GetExpression<T>(IList<DynamicFilter> filters) { if (filters.Count == 0) return null; ParameterExpression param = Expression.Parameter(typeof(T), "t");

Writing USB Drive Portable Applications in C#

One of my favorite things about owning a USB flash storage device is hauling around a bunch of useful tools with me. I'd like to write some tools, and make them work well in this kind of environment. I know C# best, and I'm productive in it, so I could get a windows forms application up in no time that way. But what considerations should I account for in making a portable app? A few

用C#编写USB驱动器便携式应用程序

我拥有USB闪存存储设备最喜欢的一件事是与我一起围绕一堆有用的工具。 我想写一些工具,并使它们在这种环境中很好地工作。 我知道C#最好,而且我的工作效率很高,所以我可以很快获得一个Windows窗体应用程序。 但是,在制作便携式应用时,我应该考虑哪些因素? 我可以想到的一些,但不知道答案: 1)语言可移植性 - 好吧,我知道任何我使用它的机器都需要安装.NET运行时。 但是,由于我只经常使用几台Windows机器,这应

How to get distances from all trained images in face recognition using EmguCV?

I was able to compile a simple face detection and recognition program in c# using EmguCV, following this article: http://ahmedopeyemi.com/main/face-detection-and-recognition-in-c-using-emgucv-3-0-opencv-wrapper-part-1/ Once trained the recognizer, the Predict method correctly returns the corresponding Label (or distance) of the image passed. Is it possible to get a list of all the distances

如何使用EmguCV获取所有训练好的图像在人脸识别中的距离?

我能够使用EmguCV在c#中编译一个简单的人脸检测和识别程序,请阅读以下文章: http://ahmedopeyemi.com/main/face-detection-and-recognition-in-c-using-emgucv-3-0-opencv-wrapper-part-1/ 一旦训练了识别器,Predict方法就会正确返回传递图像的相应标签(或距离)。 是否有可能获得图像样本和数据库中的人脸之间的所有距离的列表? 基本上,我将不得不写另一种预测方法,如下所示: http://answers.opencv.org/que

C#: Implementing an Action+Event

I'm writing a Mafia (Werewolf)-style game engine in C#. Writing out the logic of an extended mafia game, the model: A Player (Actor) has one or more Roles, and a Role contains one or more Abilities. Abilities can be Static, Triggered, or Activated (similar to Magic the Gathering) and have an "MAction" with 0 or more targets (in which order can be important) along with other modi

C#:实现一个Action +事件

我正在用C#写一个黑手党(狼人)风格的游戏引擎。 写出一个扩展的黑手党游戏的逻辑,模型: 玩家(Actor)拥有一个或多个角色,角色包含一个或多个能力。 技能可以是静止,触发或激活(类似万智牌),并且有一个“MAction”和0个或更多目标(其顺序可能很重要)以及其他修饰符。 有些发生在夜间阶段的早期阶段,其他阶段发生在优先阶段。 通过将队列放入优先级队列并解析队列,解除队列的相关事件(可以在队列中放置更多动

How to prevent a C# System.Timers timer event from blocking subsequent events?

I have a C# application that uses a System.Timers timer that repeatedly calls a function. The problem is, depending on the workload, if the processing from a function call reaches a certain CPU usage percentage (98-100%), any subsequent events are blocked. Is there a way to prevent such a scenario so that events are not blocked? For example, the timer's event handler is a function that e

如何防止阻止后续事件的C#System.Timers计时器事件?

我有一个C#应用程序使用System.Timers定时器重复调用一个函数。 问题是,根据工作负载,如果函数调用的处理达到某个CPU使用率(98-100%),则任何后续事件都会被阻止。 有没有办法阻止这种情况,以防止事件被阻止? 例如,计时器的事件处理程序是执行动态代码的函数,这可能需要一些时间和资源来处理。 在这样的处理过程中,布尔值被设置为true,这会导致后续事件调用写入日志文件。 尽管事件处理的CPU使用率很高,但其

c# events execution are thread safe?

I read a lot of event and threads discussion, but all of then focus in "what happen" if I unsuscribe from an event and try to call it later. My question is different...what will happen if I have a process in thread A that fires the event "I finish" in millisecond 1, and also have a process in thread B that fires the event "I finish" in millisecond 2. Both processe

c#事件执行是线程安全的?

我读了很多关于事件和线索的讨论,但是如果我从事件中删除并稍后再打电话,那么所有这些都将集中在“发生了什么”。 我的问题是不同的......如果我在线程A中有一个进程以毫秒1触发事件“我完成”,并且在线程B中有一个进程以毫秒2触发事件“我完成”,会发生什么。 两个进程都被认定为相同的方法来监听和处理事件。 因此,C#必须执行2次处理事件的方法:1次在线程A中触发事件,1次从线程B触发事件。 会发生什么?? 当“来自线

C# event handing in single threaded applications

I have a single threaded C# assembly (my client) that subscribes to multiple events using the same event handler (a short print statement). The emitter of the events (the server) is multitreaded and therefore could fire two events simulatiously at my single threaded client. How does the .NET platform handle this? Does it queue the events? Does it drop an event that can't be processed bec

C#事件处理单线程应用程序

我有一个单线程的C#程序集(我的客户端)使用相同的事件处理程序(一个简短的打印语句)来订阅多个事件。 事件的发射器(服务器)是多线程的,因此可以在单线程客户端模拟地触发两个事件。 .NET平台如何处理这个问题? 它排队的事件? 是否因为事件处理器忙碌而丢弃无法处理的事件? 背景 我问了一个先前的问题,但根据我需要补充的澄清来判断,我认为我可以更好地抽象出我的问题,使其更加通用并且对其他人更有用。

thread event handling in C#

I am working with a framework that runs its own event dispatcher in a separate thread. The framework may generate some events. class SomeDataSource { public event OnFrameworkEvent; void FrameworkCallback() { // This function runs on framework's thread. if (OnFrameworkEvent != null) OnFrameworkEvent(args); } } I want to deliver these events to a Winfo

C#中的线程事件处理

我正在使用一个在独立线程中运行自己的事件分派器的框架。 该框架可能会产生一些事件。 class SomeDataSource { public event OnFrameworkEvent; void FrameworkCallback() { // This function runs on framework's thread. if (OnFrameworkEvent != null) OnFrameworkEvent(args); } } 我想将这些事件传递给Winforms线程上的Winforms对象。 我明显检查了InvokeRequired并根据