C++

1, the database connection will remain open until SqlDataReader is closed, so when using SqlDataReader, you should call Sqldatareader.close () to close it immediately. 2, a connection can only be used by a SqlDataReader, which is why to close the

Threads are responsible for performing multitasking in a single application. The System.Threading namespace provides a number of classes and interfaces to manage linear programming.The simplest way to create a thread is to create a new instance of

The basic idea of C + + quick Sort is to take out one bit as the contrast bit X, to start probing from both ends of the sequence, to find a number larger than x from the right to the left, to find a number smaller than x from the left to the right,

Implementing LINQ in C + +#include #include templatestruct from_range{typedef TypeName Std::iterator_traits::value_type Value_type; Titerator Current, upcoming, End;from_range (Titerator begin, Titerator end): current (begin), upcoming (begin), end

C # supports executing code in parallel through multithreading, where a thread has its own execution path and can run concurrently with other threads. A C # program starts with a single thread, which is created automatically by the operating system

Summary of issues that occur for this reason:1, the corresponding additional library is not included, note that the directory of the additional library is/2, the function does not have a corresponding class, but the method is called in main with a

WPF (Windows Presentation Foundation)WPF is the user interface framework, the biggest feature is the separation of design and programming, so that professionals more focused, without distraction.We can manipulate it through the--xaml language of the

Public classlib{ Public Delegate voidUSERFUNCTIONCB (); Private StaticUSERFUNCTIONCB M_USERFNCB; /// ///The function that needs the callback is passed in at initialization/// /// Public Static voidinitcallbackfunction

by System.Reflection the classes in the namespace and the System. Type, you can obtain information about the loaded assemblies and the types in which they are defined (such as classes, interfaces, and value types). You can also use reflection to

A Lambda expression is an anonymous function that you can use to create a delegate or an expression tree type. by using a lambda expression, you can write a local function that can be passed as a parameter or returned as a function call value.

One, the regular expression ofThe main purpose is to match the string. You can use an online regular expression, a regular expression plug-in, a regular expression class (Regex).The basic syntax of regular expressions\d: Digital.: Any character

We learned interface, the interface, which is a bit like the abstract class, but they also have some differences, such as the class cannot be multiple inheritance but the interface can inherit multiple.An interface contains only the signature of a

1.WPF is written in the appealing language XAML.2.WPF is flexible.3. For rich interface development."Wpfapplication1.window1"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="Http://schemas.microsoft.com/winfx/2006/xaml"Title=

First, briefly list the data structures needed for the implementation process.Such asFor this diagram, its adjacency table can be expressed in this way, of course, the form can be varied, this is just a random representation of me.Vertex table Edge

9-degree oj 1530 longest non-duplicate substring, oj1530 Original question link: http://ac.jobdu.com/problem.php? Pid = 1, 1530 The string is simple. It seems that the complexity of O (n ^ 2) is 10000 of the data size. In fact, the maximum number

One Person Game (zoj3593 + Extended Euclidean), personzoj3593One Person GameTime Limit:2000 MSMemory Limit:65536KB64bit IO Format:% Lld & % maid Status Practice ZOJ 3593 Description There is an interesting and simple one person game. Suppose there

Hdu 2089 must be 62-digit dp # Include # Include # Include # Include # Include # Include # Include # Include # Include # Include

C ++ implements the KMP Algorithm # Include # Include # Include Using namespace std; void NEXT (const string & T, vector & Next) {// Generate vector, next (T. size () next [0] =-1; for (int I = 1; I = 0) j = next [j];

CSU1600: Twenty-four point (DFS)Description Given four numbers, can you get twenty-four through the addition, subtraction, multiplication, and division? Each number can be used only once.  Input The input consists of multiple test cases. each test

CSU1604: SunnyPig (BFS)Description SunnyPig is a pig who is much cleverer than any other pig in the pigpen. one sunny morning, SunnyPig wants to go out of the pigpen to date Mrs. snail Il, his beloved. however, it's terribly tough for a pig to go