C#

Some operations on the C # DataTableRegular operation of the DataTable can be done by manipulating the DataTable for some things that do not need to be repeated by SQL.Method One:is also widely known as one of:YourDataTable.Columns.Remove ("column

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Batch download of images and Images 2. Main Code: Private async void button_Click (object sender, RoutedEventArgs e) {var htmlContent = await FileDownLoader. instance. getAsync (webUrl. text); HtmlAgilityPack. htmlDocument doc = new

TextBox prohibit copy and paste and digit verification, decimal verification, Chinese Character verification, textbox decimal   Verify Decimals  # Region verify decimals /// /// verify decimals /// /// /// private void

Object Class and DataTable conversion, object datatable ConversionIntroduction Recently, the time spent in database query in the project always needs to use the conversion from a data table to a list of Object-class objects. It encapsulates a

I also want to write: DBHelper for database category, and dbhelper for database category I. Preface I believe that many people will spend the following time:". Net database category". And a bunchSqlHelper. I have also used these SqlHelper and I have

C # Websocket instanceThis blog is a reference to the above example to teach you how to use websocket on the client and server. For those who are good at English, you can simply look at the source code above, the following explains how to use

C # three features of object-oriented,   The following is an object-oriented image that you can better understand !!! 1. encapsulation: We can take everything in the world as an object, so here we take people as an example, a person must be an

C # The thread joins the instance, There is a question: Four threads t1, t2, t3, t4, write data to four files, requirements: t1 can only write "1", t2 can only write "2 ", t3 can only write "3", t4 can only write "4", write the following content to

C # convert word, pdf, and ppt into images Office Word documents, pdf documents, and powerpoint slides are commonly used document types, in reality, it is often necessary to convert them into images-converting every page of word, pdf, and ppt

In Visual Studio, use a layer-relationship diagram to describe the system architecture, technology stack, and studio system architecture.   When you need to describe the architecture or technology stack of a project, you can consider using a layer-

C # Call C ++ Dll, Now, the project is basically thrown to me by the C ++ buddy, and then I call it. A long time ago, I went down a c # method to call c ++ dll in the evening, and the source was forgotten. Nothing to worry about. Put it up. The

157 suggestions for writing high-quality code to improve C # programs-Recommendation 52: release resources in a timely manner, Suggestion 52: release resources in time The garbage collection mechanism automatically recycles resources implicitly (the

C # The application can only run one instance. When running multiple times, the current instance is activated and its interface is displayed. Many times, the program we develop requires the single-instance running function, that is, the entire

C # Check whether the Sub-thread has been completed regularly C # Check whether the Sub-thread has been completed regularly   Class Program {static void Main (string [] args) {// start a support thread in the Main thread and execute a method such

C # SQL Server database image access # Region database image access //////Import images to the database//////Public void Import (string filePath) {string fileName = filePath. substring (filePath. lastIndexOf (@) + 1, filePath. lastIndexOf (.)

. NET regularly sends emails, and. NET sends emails Add a Global application class Global. asax The code will run when accessing the website Global. asax code: 1 void Application_Start (object sender, EventArgs e) 2 {3 // code 4 System when the

Use C # to implement priority queue Priority queue is an important data structure. I often use ACM for questions. C ++ STL includes priority_queue. Java also has the PriorityQueue class. Unfortunately, Priority Queues are not included in. NET

3. C # object-oriented: encapsulation, inheritance, polymorphism, String, set, file (bottom ), Object-oriented Polymorphism I. packing and unpacking Packing: Convert the value type to the reference type. Object o = 1; Value Type assigned to

Using usage in C # I wrote an example about how to use wcf. There is a using () {} sentence in it. In the past, using not only references namespaces, but also has other functions.   The using keyword is used in C # in three ways:1. Used in