其他

文章目錄 Semaphores SemaphoresA Semaphore inherits from System.Threading.WaitHandle; as such, it has the WaitOne() method. You are also able to use the static System.Threading.WaitHandle, WaitAny(), WaitAll(), SignalAndWait() 

在.NET 2.0 SP 1隨著.NET 3.5發布後線程池發生了重大的變化。不過據Michael C.

Simple blocking methodsThese wait for another thread to finish or for a period of time to elapse. Sleep, Join, and Task.Wait are simple blocking methods.Locking constructsThese limit the number of threads that can perform some activity or execute a

簡介SQL Studio是一款輕便的、運行於.Net平台上的SQL執行工具，它採用同一的方式，對多種資料庫執行建立資料庫操作（目前已支援SQL Server、MySQL、MS Access 2007資料庫）。SQL Studio提供一系列擴充命令，使得建立資料庫連接等操作可以通過命令完成。SQL Studio對部分SQL命令進行語義轉換，以更貼近日常操作。例如，在SQL Studio中，選中一個表名，點擊執行，它會解釋為select top 100* from [表]，而不是當做預存程序來執行。

An HTTP client library with a very simple API, written in CSharp (.Net 2.0) for sending HTTP requests and receiving HTTP responses. This library is much simpler to use than the HttpWebRequest provided with the .Net library. This library was inspired

悲觀鎖與樂觀鎖----------悲觀鎖【Pessimistic

定義1. 虛方法必須有實現部分，並為衍生類別提供了覆蓋該方法的選項 抽象方法沒有提供實現部分，抽象方法是一種強制衍生類別覆蓋的方法，否則衍生類別將不能被執行個體化2. 抽象方法只能在抽象類別中聲明， 抽象方法必須在衍生類別中重寫 虛方法不是 也不必要重寫。其實如果類包含抽象方法，那麼該類也是抽象的，也必須聲明為抽象的。3. 抽象方法必須在衍生類別中重寫，這一點跟介面類似，虛方法不必。抽象方法不能聲明方法實體 而虛方法可以包含抽象方法的類不能執行個體化

本質的不同是，在運行時，對於常數不需要任何記憶體配置，但對欄位，運行時會在欄位所在的執行個體被建立時分配動態記憶體。對於這點區別，有幾個問題需要作相關的深入發現，第一、正是因為常數沒有相關的記憶體位址，編譯器會在編譯時間就確定所有對常數符號的數值替換。Asp.net基於這個機制會產生版本問題，例如：如果程式集B中的常數由於業務因素髮生了變化，那麼程式集B肯定是要重新編譯的，但如果之前引用程式集B常數的其它程式集就不得不因此也要重新編譯了。否則常數值會一直會用之前的那個值。這就是所說的版本問題。第

recently ,when i was coding a simple enought wf service program.i found a weird problem by using the Wcf test client tool.my wcf endpoint is  http://localhost:8000/WFServicesbut if i acess this address in my chrome.i got a message like this. The

compare to the association and dependence ,the aggregation and composition relationship of two class is closer。let 's check it out.This short article will put forward my understanding of composition and aggregation and how I would express it in C#

firstly create a WF service which act like normal WCF service to be our service for testing.1. create a wf console project.2. add a class which  is responsible for building a workflow . here is the

文章目錄 MutexApplication Single InstanceLockMethodImpl.Synchronized attributeSynchronizationAttribute MutexA Mutex works in much the same way as the lock statement (that we will look at in the Critical sections section below)

 如果對類應用 static 關鍵字，則該類的所有成員都必須是靜態。 引用《C#語言參考》 Members of a class are either static members or instance members. Generally speaking, it is useful to think of static members as belonging to class types and instance members as belonging to objects

I want to begin with a conceptual explanation about services. A service always has at least one endpoint, but can have multiple. A client normally communicates with only one endpoint. A plain-old-webservice only has one endpoint and communicates via

文章目錄 簡介理解原子性(Atomicity)理解一致性(Consistency)理解隔離性（Isolation)總結 簡介    

As seen in the previous article, we need an address, binding and contract to complete the WCF ABC. We'll start at the contract.A contract is defined explicitly, via a class. You add a [ServiceContract] attribute to the class. All methods you want to

Simple FactoryIs a class that can product various sub types of Product. (It is better than the Static Factory. When new types are added the base Product class does not need to be changed only the Simple Factory

本質上，資料庫的樂觀鎖做法和悲觀鎖做法主要就是解決下面假設的情境，避免丟失更新問題： 一個比較清楚的情境 下面這個假設的實際情境可以比較清楚的協助我們理解這個問題： 假設噹噹網上使用者下單買了本書，這時資料庫中有條訂單號為001的訂單，其中有個status欄位是’有效’,表示該訂單是有效；後台管理員查詢到這條001的訂單，並且看到狀態是有效使用者發現下單的時候下錯了，於是撤銷訂單，假設運行這樣一條SQL: update order_table set status = ‘取消’ where

A lot of folks who don’t know enough about AOP (Aspect Oriented Programming) feel that they can achieve the same results by using the decorator pattern. While AOP is similar in concept, there is a lot more that AOP can solve that a decorator pattern

文章目錄 端到端與點到點的區別