How can one use a lambda to create a new EventHandler?

It seems like I should have everything that I need here, but the particulars of making it happen are driving me crazy. I have a static utility method which takes a web service client object, extracts a designated EventInfo from it, and is supposed to add some handlers to that event, essentially callbacks for when the web service invocation completes. The problem is, as any given event essentia

如何使用lambda创建一个新的EventHandler?

似乎我应该拥有我需要的一切,但是让它发生的细节让我发疯。 我有一个静态实用程序方法,它接受一个Web服务客户端对象,从中提取一个指定的EventInfo,并且应该为该事件添加一些处理程序,本质上是在Web服务调用完成时进行回调。 问题是,因为任何给定的事件本质上都有自己的处理程序重载(WCF生成的代码为每个方法和相应的事件提供了唯一的SomeMethodCompletedEventArgs ),所以我无法弄清楚如何实现这种情况。 我有两个

How to update related entities in Entity Framework

I have an MVC project and using Entity Framework Code First and POCO objects for the database. For example: public class ClassA { public int? Id {get; set;} public string Name { get; set;} public virtual ClassB B {get; set;} } public class ClassB { public int? Id {get;set;} public string Description {get;set;} } I have an ActionResult that create or edit a model. The problem is whe

如何更新实体框架中的相关实体

我有一个MVC项目,并使用Entity Framework Code First和POCO对象作为数据库。 例如: public class ClassA { public int? Id {get; set;} public string Name { get; set;} public virtual ClassB B {get; set;} } public class ClassB { public int? Id {get;set;} public string Description {get;set;} } 我有一个创建或编辑模型的ActionResult。 问题是当我调用这个ActionResult来更新模型,并且model.B已被

Box filter with cuda c

i have little experiance with cuda and trying to write a box filter. I read that a box filter is a filter in which each pixel in the resulting image has a value equal to the average value of its neighboring pixels in the input image. I have foud this document http://www.nvidia.com/content/nvision2008/tech_presentations/Game_Developer_Track/NVISION08-Image_Processing_and_Video_with_CUDA.pdf and

带有cuda的盒式过滤器c

我对cuda没有什么体验,并试图写一个盒子过滤器。 我读过盒式滤波器是一个滤波器,其中生成的图像中的每个像素的值等于输入图像中相邻像素的平均值。 我已经找到了这个文件http://www.nvidia.com/content/nvision2008/tech_presentations/Game_Developer_Track/NVISION08-Image_Processing_and_Video_with_CUDA.pdf,并稍微改变了一下代码。 这是我的功能。 #define TILE_W 16 #define TILE_H 16 #define R

How can I convert a Unix timestamp to DateTime and vice versa?

There is this example code, but then it starts talking about millisecond / nanosecond problems. The same question is on MSDN, Seconds since the Unix epoch in C#. This is what I've got so far: public Double CreatedEpoch { get { DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime(); TimeSpan span = (this.Created.ToLocalTime() - epoch); return span.TotalSeconds

我如何将Unix时间戳转换为DateTime,反之亦然?

有这个示例代码,但它开始谈论毫秒/纳秒问题。 自从C#中的Unix时代开始,MSDN上就出现了同样的问题。 这是我到目前为止: public Double CreatedEpoch { get { DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime(); TimeSpan span = (this.Created.ToLocalTime() - epoch); return span.TotalSeconds; } set { DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocal

Converting a String to DateTime

如何将字符串(如2009-05-08 14:40:52,531转换为DateTime ? 由于您正在处理基于24小时的时间,并且用逗号分隔秒分数,所以我建议您指定一种自定义格式: DateTime myDate = DateTime.ParseExact("2009-05-08 14:40:52,531", "yyyy-MM-dd HH:mm:ss,fff", System.Globalization.CultureInfo.InvariantCulture); You have basically two options for this. DateTime.Parse() and DateTime.

将字符串转换为DateTime

如何将字符串(如2009-05-08 14:40:52,531转换为DateTime ? 由于您正在处理基于24小时的时间,并且用逗号分隔秒分数,所以我建议您指定一种自定义格式: DateTime myDate = DateTime.ParseExact("2009-05-08 14:40:52,531", "yyyy-MM-dd HH:mm:ss,fff", System.Globalization.CultureInfo.InvariantCulture); 基本上你有两个选择。 DateTime.Parse()和DateTime.ParseExact() 。 首先

Using boolean values in C

C doesn't have any built-in boolean types. What's the best way to use them in C? Option 1 typedef int bool; #define true 1 #define false 0 Option 2 typedef int bool; enum { false, true }; Option 3 typedef enum { false, true } bool; Option 4 (C99) #include <stdbool.h> Explanation Options 1, 2 and 3 will have in practice the same identical behavior. #2 and #3 don't u

在C中使用布尔值

C没有任何内置的布尔类型。 在C中使用它们的最佳方式是什么? 选项1 typedef int bool; #define true 1 #define false 0 选项2 typedef int bool; enum { false, true }; 选项3 typedef enum { false, true } bool; 备选案文4(C99) #include <stdbool.h> 说明 选项1,2和3在实践中将具有相同的行为。 #2和#3虽然没有使用#defines,在我看来这更好。 选项4只有在使用C99的情况下才有效,这是实现它的“标

LEFT OUTER JOIN in LINQ

How to perform left outer join in C# LINQ to objects without using join-on-equals-into clauses? Is there any way to do that with where clause? Correct problem: For inner join is easy and I have a solution like this List<JoinPair> innerFinal = (from l in lefts from r in rights where l.Key == r.Key select new JoinPair { LeftId = l.Id, RightId = r.Id}) but for

LEFT OUTER JOIN LINQ

如何在不使用join-on-equals-into子句的情况下将C#LINQ中的左外连接执行为对象? 有什么方法可以用where子句做到这一点? 正确的问题:内部连接很容易,我有这样的解决方案 List<JoinPair> innerFinal = (from l in lefts from r in rights where l.Key == r.Key select new JoinPair { LeftId = l.Id, RightId = r.Id}) 但对于左外连接,我需要一个解决方案。 我的是这样的,但它不起

How to set Access column value to 0 (default) on a new created DB column? C#

So I have read multiple posts about my question but I cant find the right solution for it. I've got a form in which a user can add a custom column to a database. This column is always of type currency with the currency type of Euro. I thought I did the trick by creating this query: string query = "ALTER TABLE Uitgaven ADD COLUMN [" + textBox16.Text + "] MONEY DEFAULT 0";

如何在新创建的数据库列上将Access列值设置为0(默认值)? C#

所以我已经阅读了关于我的问题的多篇文章,但我找不到适合它的解决方案。 我有一个表单,用户可以在其中添加自定义列到数据库。 此列始终是货币类型为欧元的货币。 我以为我通过创建这个查询来做到这一点: string query = "ALTER TABLE Uitgaven ADD COLUMN [" + textBox16.Text + "] MONEY DEFAULT 0"; command.CommandText = query; command.ExecuteNonQuery(); 在我初始化

first migration: How to set default value for new property?

I am using EF6 for storing instances of the report class in my database. The database already contains data. Say I wanted to add a property to report , public class report { // ... some previous properties // ... new property: public string newProperty{ get; set; } } Now if I go to the package-manager console and execute add-migration Report-added-newProperty update-database I

第一次迁移:如何为新的属性设置默认值?

我正在使用EF6在我的数据库中存储report类的实例。 该数据库已经包含数据。 假设我想添加一个属性来report , public class report { // ... some previous properties // ... new property: public string newProperty{ get; set; } } 现在,如果我去包管理器控制台并执行 add-migration Report-added-newProperty update-database 我将在'/ Migrations'文件夹中为文件添加一个newProperty列到表中

Define Python class from C

I wrapped some C code for Python and it works. The C module creates a handle, which I pass to Python as PyCapsule . The API I would like to have can be made in Python like: import wrapped class Test(object): def __init__(self, loc ): self.handle = wrapped.new(loc) def foo(self, data): return wrapped.foo(self.handle, data) So the question is more a cosmetic issue. Do I hav

从C中定义Python类

我为Python封装了一些C代码,它可以工作。 C模块创建一个句柄,我将其作为PyCapsule传递给Python。 我想要的API可以用Python编写,如下所示: import wrapped class Test(object): def __init__(self, loc ): self.handle = wrapped.new(loc) def foo(self, data): return wrapped.foo(self.handle, data) 所以这个问题更多的是一个整容问题。 我是否必须封装包装器,或者可以像上面所示的那样将代码移